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Comparing Coro/Coro/State.xs (file contents):
Revision 1.12 by root, Sun Jul 22 03:24:10 2001 UTC vs.
Revision 1.223 by root, Wed Feb 13 15:46:00 2008 UTC

1#include "libcoro/coro.c"
2
3#define PERL_NO_GET_CONTEXT
4#define PERL_EXT
5
1#include "EXTERN.h" 6#include "EXTERN.h"
2#include "perl.h" 7#include "perl.h"
3#include "XSUB.h" 8#include "XSUB.h"
4 9
5#if 1 10#include "patchlevel.h"
6# define CHK(x) (void *)0 11
12#include <stdio.h>
13#include <errno.h>
14#include <assert.h>
15#include <inttypes.h> /* portable stdint.h */
16
17#ifdef HAVE_MMAP
18# include <unistd.h>
19# include <sys/mman.h>
20# ifndef MAP_ANONYMOUS
21# ifdef MAP_ANON
22# define MAP_ANONYMOUS MAP_ANON
23# else
24# undef HAVE_MMAP
25# endif
26# endif
27# include <limits.h>
28# ifndef PAGESIZE
29# define PAGESIZE pagesize
30# define BOOT_PAGESIZE pagesize = sysconf (_SC_PAGESIZE)
31static long pagesize;
32# else
33# define BOOT_PAGESIZE (void)0
34# endif
7#else 35#else
8# define CHK(x) if (!(x)) croak("FATAL, CHK: " #x) 36# define PAGESIZE 0
37# define BOOT_PAGESIZE (void)0
38#endif
39
40#if CORO_USE_VALGRIND
41# include <valgrind/valgrind.h>
42# define REGISTER_STACK(cctx,start,end) (cctx)->valgrind_id = VALGRIND_STACK_REGISTER ((start), (end))
43#else
44# define REGISTER_STACK(cctx,start,end)
45#endif
46
47/* the maximum number of idle cctx that will be pooled */
48#define MAX_IDLE_CCTX 8
49
50#define PERL_VERSION_ATLEAST(a,b,c) \
51 (PERL_REVISION > (a) \
52 || (PERL_REVISION == (a) \
53 && (PERL_VERSION > (b) \
54 || (PERL_VERSION == (b) && PERLSUBVERSION >= (c)))))
55
56#if !PERL_VERSION_ATLEAST (5,6,0)
57# ifndef PL_ppaddr
58# define PL_ppaddr ppaddr
9#endif 59# endif
60# ifndef call_sv
61# define call_sv perl_call_sv
62# endif
63# ifndef get_sv
64# define get_sv perl_get_sv
65# endif
66# ifndef get_cv
67# define get_cv perl_get_cv
68# endif
69# ifndef IS_PADGV
70# define IS_PADGV(v) 0
71# endif
72# ifndef IS_PADCONST
73# define IS_PADCONST(v) 0
74# endif
75#endif
10 76
11#define MAY_FLUSH /* increases codesize */ 77/* 5.8.8 */
78#ifndef GV_NOTQUAL
79# define GV_NOTQUAL 0
80#endif
81#ifndef newSV
82# define newSV(l) NEWSV(0,l)
83#endif
12 84
13#define SUB_INIT "Coro::State::initialize" 85/* 5.11 */
86#ifndef CxHASARGS
87# define CxHASARGS(cx) (cx)->blk_sub.hasargs
88#endif
14 89
15#define TRANSFER_SAVE_DEFAV 0x00000001 90/* 5.8.7 */
16#define TRANSFER_SAVE_DEFSV 0x00000002 91#ifndef SvRV_set
17#define TRANSFER_SAVE_ERRSV 0x00000004 92# define SvRV_set(s,v) SvRV(s) = (v)
93#endif
18 94
19#define TRANSFER_SAVE_ALL -1 95#if !__i386 && !__x86_64 && !__powerpc && !__m68k && !__alpha && !__mips && !__sparc64
96# undef CORO_STACKGUARD
97#endif
20 98
99#ifndef CORO_STACKGUARD
100# define CORO_STACKGUARD 0
101#endif
102
103/* prefer perl internal functions over our own? */
104#ifndef CORO_PREFER_PERL_FUNCTIONS
105# define CORO_PREFER_PERL_FUNCTIONS 0
106#endif
107
108/* The next macros try to return the current stack pointer, in an as
109 * portable way as possible. */
110#define dSTACKLEVEL volatile char stacklevel
111#define STACKLEVEL ((void *)&stacklevel)
112
113#define IN_DESTRUCT (PL_main_cv == Nullcv)
114
115#if __GNUC__ >= 3
116# define attribute(x) __attribute__(x)
117# define BARRIER __asm__ __volatile__ ("" : : : "memory")
118# define expect(expr,value) __builtin_expect ((expr),(value))
119#else
120# define attribute(x)
121# define BARRIER
122# define expect(expr,value) (expr)
123#endif
124
125#define expect_false(expr) expect ((expr) != 0, 0)
126#define expect_true(expr) expect ((expr) != 0, 1)
127
128#define NOINLINE attribute ((noinline))
129
130#include "CoroAPI.h"
131
132#ifdef USE_ITHREADS
133static perl_mutex coro_mutex;
134# define LOCK do { MUTEX_LOCK (&coro_mutex); } while (0)
135# define UNLOCK do { MUTEX_UNLOCK (&coro_mutex); } while (0)
136#else
137# define LOCK (void)0
138# define UNLOCK (void)0
139#endif
140
141/* helper storage struct for Coro::AIO */
142struct io_state
143{
144 int errorno;
145 I32 laststype;
146 int laststatval;
147 Stat_t statcache;
148};
149
150static size_t coro_stacksize = CORO_STACKSIZE;
151static struct CoroAPI coroapi;
152static AV *main_mainstack; /* used to differentiate between $main and others */
153static JMPENV *main_top_env;
154static HV *coro_state_stash, *coro_stash;
155static volatile SV *coro_mortal; /* will be freed after next transfer */
156
157static GV *irsgv; /* $/ */
158static GV *stdoutgv; /* *STDOUT */
159static SV *rv_diehook;
160static SV *rv_warnhook;
161static HV *hv_sig; /* %SIG */
162
163/* async_pool helper stuff */
164static SV *sv_pool_rss;
165static SV *sv_pool_size;
166static AV *av_async_pool;
167
168static struct coro_cctx *cctx_first;
169static int cctx_count, cctx_idle;
170
171enum {
172 CC_MAPPED = 0x01,
173 CC_NOREUSE = 0x02, /* throw this away after tracing */
174 CC_TRACE = 0x04,
175 CC_TRACE_SUB = 0x08, /* trace sub calls */
176 CC_TRACE_LINE = 0x10, /* trace each statement */
177 CC_TRACE_ALL = CC_TRACE_SUB | CC_TRACE_LINE,
178};
179
180/* this is a structure representing a c-level coroutine */
181typedef struct coro_cctx {
182 struct coro_cctx *next;
183
184 /* the stack */
185 void *sptr;
186 size_t ssize;
187
188 /* cpu state */
189 void *idle_sp; /* sp of top-level transfer/schedule/cede call */
190 JMPENV *idle_te; /* same as idle_sp, but for top_env, TODO: remove once stable */
191 JMPENV *top_env;
192 coro_context cctx;
193
194#if CORO_USE_VALGRIND
195 int valgrind_id;
196#endif
197 unsigned char flags;
198} coro_cctx;
199
200enum {
201 CF_RUNNING = 0x0001, /* coroutine is running */
202 CF_READY = 0x0002, /* coroutine is ready */
203 CF_NEW = 0x0004, /* has never been switched to */
204 CF_DESTROYED = 0x0008, /* coroutine data has been freed */
205};
206
207/* the structure where most of the perl state is stored, overlaid on the cxstack */
208typedef struct {
209 SV *defsv;
210 AV *defav;
211 SV *errsv;
212 SV *irsgv;
213#define VAR(name,type) type name;
214# include "state.h"
215#undef VAR
216} perl_slots;
217
218#define SLOT_COUNT ((sizeof (perl_slots) + sizeof (PERL_CONTEXT) - 1) / sizeof (PERL_CONTEXT))
219
220/* this is a structure representing a perl-level coroutine */
21struct coro { 221struct coro {
22 /* optionally saved, might be zero */ 222 /* the c coroutine allocated to this perl coroutine, if any */
23 AV *defav; 223 coro_cctx *cctx;
24 SV *defsv;
25 SV *errsv;
26
27 /* saved global state not related to stacks */
28 U8 dowarn;
29 224
30 /* the stacks and related info (callchain etc..) */ 225 /* process data */
31 PERL_SI *curstackinfo;
32 AV *curstack;
33 AV *mainstack; 226 AV *mainstack;
34 SV **stack_sp; 227 perl_slots *slot; /* basically the saved sp */
35 OP *op;
36 SV **curpad;
37 SV **stack_base;
38 SV **stack_max;
39 SV **tmps_stack;
40 I32 tmps_floor;
41 I32 tmps_ix;
42 I32 tmps_max;
43 I32 *markstack;
44 I32 *markstack_ptr;
45 I32 *markstack_max;
46 I32 *scopestack;
47 I32 scopestack_ix;
48 I32 scopestack_max;
49 ANY *savestack;
50 I32 savestack_ix;
51 I32 savestack_max;
52 OP **retstack;
53 I32 retstack_ix;
54 I32 retstack_max;
55 COP *curcop;
56 228
57 /* data associated with this coroutine (initial args) */ 229 AV *args; /* data associated with this coroutine (initial args) */
58 AV *args; 230 int refcnt; /* coroutines are refcounted, yes */
231 int flags; /* CF_ flags */
232 HV *hv; /* the perl hash associated with this coro, if any */
233
234 /* statistics */
235 int usecount; /* number of transfers to this coro */
236
237 /* coro process data */
238 int prio;
239 SV *throw; /* exception to be thrown */
240
241 /* async_pool */
242 SV *saved_deffh;
243
244 /* linked list */
245 struct coro *next, *prev;
59}; 246};
60 247
61typedef struct coro *Coro__State; 248typedef struct coro *Coro__State;
62typedef struct coro *Coro__State_or_hashref; 249typedef struct coro *Coro__State_or_hashref;
63 250
64static AV *main_mainstack; /* used to differentiate between $main and others */ 251/** Coro ********************************************************************/
65 252
66static HV *padlist_cache; 253#define PRIO_MAX 3
254#define PRIO_HIGH 1
255#define PRIO_NORMAL 0
256#define PRIO_LOW -1
257#define PRIO_IDLE -3
258#define PRIO_MIN -4
67 259
68/* mostly copied from op.c:cv_clone2 */ 260/* for Coro.pm */
69STATIC AV * 261static SV *coro_current;
70clone_padlist (AV *protopadlist) 262static AV *coro_ready [PRIO_MAX-PRIO_MIN+1];
263static int coro_nready;
264static struct coro *coro_first;
265
266/** lowlevel stuff **********************************************************/
267
268static SV *
269coro_get_sv (pTHX_ const char *name, int create)
71{ 270{
72 AV *av; 271#if PERL_VERSION_ATLEAST (5,9,0)
73 I32 ix; 272 /* silence stupid and wrong 5.10 warning that I am unable to switch off */
74 AV *protopad_name = (AV *) * av_fetch (protopadlist, 0, FALSE); 273 get_sv (name, create);
75 AV *protopad = (AV *) * av_fetch (protopadlist, 1, FALSE); 274#endif
76 SV **pname = AvARRAY (protopad_name); 275 return get_sv (name, create);
77 SV **ppad = AvARRAY (protopad); 276}
78 I32 fname = AvFILLp (protopad_name); 277
79 I32 fpad = AvFILLp (protopad); 278static AV *
279coro_get_av (pTHX_ const char *name, int create)
280{
281#if PERL_VERSION_ATLEAST (5,9,0)
282 /* silence stupid and wrong 5.10 warning that I am unable to switch off */
283 get_av (name, create);
284#endif
285 return get_av (name, create);
286}
287
288static HV *
289coro_get_hv (pTHX_ const char *name, int create)
290{
291#if PERL_VERSION_ATLEAST (5,9,0)
292 /* silence stupid and wrong 5.10 warning that I am unable to switch off */
293 get_hv (name, create);
294#endif
295 return get_hv (name, create);
296}
297
298static AV *
299coro_clone_padlist (pTHX_ CV *cv)
300{
301 AV *padlist = CvPADLIST (cv);
80 AV *newpadlist, *newpad_name, *newpad; 302 AV *newpadlist, *newpad;
81 SV **npad;
82
83 newpad_name = newAV ();
84 for (ix = fname; ix >= 0; ix--)
85 av_store (newpad_name, ix, SvREFCNT_inc (pname[ix]));
86
87 newpad = newAV ();
88 av_fill (newpad, AvFILLp (protopad));
89 npad = AvARRAY (newpad);
90 303
91 newpadlist = newAV (); 304 newpadlist = newAV ();
92 AvREAL_off (newpadlist); 305 AvREAL_off (newpadlist);
93 av_store (newpadlist, 0, (SV *) newpad_name); 306#if PERL_VERSION_ATLEAST (5,9,0)
307 Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1);
308#else
309 Perl_pad_push (aTHX_ padlist, AvFILLp (padlist) + 1, 1);
310#endif
311 newpad = (AV *)AvARRAY (padlist)[AvFILLp (padlist)];
312 --AvFILLp (padlist);
313
314 av_store (newpadlist, 0, SvREFCNT_inc (*av_fetch (padlist, 0, FALSE)));
94 av_store (newpadlist, 1, (SV *) newpad); 315 av_store (newpadlist, 1, (SV *)newpad);
95 316
96 av = newAV (); /* will be @_ */ 317 return newpadlist;
97 av_extend (av, 0); 318}
98 av_store (newpad, 0, (SV *) av);
99 AvFLAGS (av) = AVf_REIFY;
100 319
101 for (ix = fpad; ix > 0; ix--) 320static void
321free_padlist (pTHX_ AV *padlist)
322{
323 /* may be during global destruction */
324 if (SvREFCNT (padlist))
102 { 325 {
103 SV *namesv = (ix <= fname) ? pname[ix] : Nullsv; 326 I32 i = AvFILLp (padlist);
104 if (namesv && namesv != &PL_sv_undef) 327 while (i >= 0)
105 { 328 {
106 char *name = SvPVX (namesv); /* XXX */ 329 SV **svp = av_fetch (padlist, i--, FALSE);
107 if (SvFLAGS (namesv) & SVf_FAKE || *name == '&') 330 if (svp)
108 { /* lexical from outside? */
109 npad[ix] = SvREFCNT_inc (ppad[ix]);
110 } 331 {
111 else
112 { /* our own lexical */
113 SV *sv; 332 SV *sv;
114 if (*name == '&') 333 while (&PL_sv_undef != (sv = av_pop ((AV *)*svp)))
115 sv = SvREFCNT_inc (ppad[ix]); 334 SvREFCNT_dec (sv);
116 else if (*name == '@') 335
117 sv = (SV *) newAV (); 336 SvREFCNT_dec (*svp);
118 else if (*name == '%')
119 sv = (SV *) newHV ();
120 else
121 sv = NEWSV (0, 0);
122 if (!SvPADBUSY (sv))
123 SvPADMY_on (sv);
124 npad[ix] = sv;
125 } 337 }
126 } 338 }
127 else if (IS_PADGV (ppad[ix]) || IS_PADCONST (ppad[ix]))
128 {
129 npad[ix] = SvREFCNT_inc (ppad[ix]);
130 }
131 else
132 {
133 SV *sv = NEWSV (0, 0);
134 SvPADTMP_on (sv);
135 npad[ix] = sv;
136 }
137 }
138 339
139#if 0 /* return -ENOTUNDERSTOOD */
140 /* Now that vars are all in place, clone nested closures. */
141
142 for (ix = fpad; ix > 0; ix--) {
143 SV* namesv = (ix <= fname) ? pname[ix] : Nullsv;
144 if (namesv
145 && namesv != &PL_sv_undef
146 && !(SvFLAGS(namesv) & SVf_FAKE)
147 && *SvPVX(namesv) == '&'
148 && CvCLONE(ppad[ix]))
149 {
150 CV *kid = cv_clone((CV*)ppad[ix]);
151 SvREFCNT_dec(ppad[ix]);
152 CvCLONE_on(kid);
153 SvPADMY_on(kid);
154 npad[ix] = (SV*)kid;
155 }
156 }
157#endif
158
159 return newpadlist;
160}
161
162#ifdef MAY_FLUSH
163STATIC AV *
164free_padlist (AV *padlist)
165{
166 /* may be during global destruction */
167 if (SvREFCNT(padlist))
168 {
169 I32 i = AvFILLp(padlist);
170 while (i >= 0)
171 {
172 SV **svp = av_fetch(padlist, i--, FALSE);
173 SV *sv = svp ? *svp : Nullsv;
174 if (sv)
175 SvREFCNT_dec(sv);
176 }
177
178 SvREFCNT_dec((SV*)padlist); 340 SvREFCNT_dec ((SV*)padlist);
179 } 341 }
180} 342}
181#endif 343
344static int
345coro_cv_free (pTHX_ SV *sv, MAGIC *mg)
346{
347 AV *padlist;
348 AV *av = (AV *)mg->mg_obj;
349
350 /* casting is fun. */
351 while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
352 free_padlist (aTHX_ padlist);
353
354 return 0;
355}
356
357#define CORO_MAGIC_type_cv PERL_MAGIC_ext
358#define CORO_MAGIC_type_state PERL_MAGIC_ext
359
360static MGVTBL coro_cv_vtbl = {
361 0, 0, 0, 0,
362 coro_cv_free
363};
364
365#define CORO_MAGIC(sv,type) \
366 SvMAGIC (sv) \
367 ? SvMAGIC (sv)->mg_type == type \
368 ? SvMAGIC (sv) \
369 : mg_find (sv, type) \
370 : 0
371
372#define CORO_MAGIC_cv(cv) CORO_MAGIC (((SV *)(cv)), CORO_MAGIC_type_cv)
373#define CORO_MAGIC_state(sv) CORO_MAGIC (((SV *)(sv)), CORO_MAGIC_type_state)
374
375static struct coro *
376SvSTATE_ (pTHX_ SV *coro)
377{
378 HV *stash;
379 MAGIC *mg;
380
381 if (SvROK (coro))
382 coro = SvRV (coro);
383
384 if (expect_false (SvTYPE (coro) != SVt_PVHV))
385 croak ("Coro::State object required");
386
387 stash = SvSTASH (coro);
388 if (expect_false (stash != coro_stash && stash != coro_state_stash))
389 {
390 /* very slow, but rare, check */
391 if (!sv_derived_from (sv_2mortal (newRV_inc (coro)), "Coro::State"))
392 croak ("Coro::State object required");
393 }
394
395 mg = CORO_MAGIC_state (coro);
396 return (struct coro *)mg->mg_ptr;
397}
398
399#define SvSTATE(sv) SvSTATE_ (aTHX_ (sv))
182 400
183/* the next two functions merely cache the padlists */ 401/* the next two functions merely cache the padlists */
184STATIC void 402static void
185get_padlist (CV *cv) 403get_padlist (pTHX_ CV *cv)
186{ 404{
187 SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 0); 405 MAGIC *mg = CORO_MAGIC_cv (cv);
406 AV *av;
188 407
189 if (he && AvFILLp ((AV *)*he) >= 0) 408 if (expect_true (mg && AvFILLp ((av = (AV *)mg->mg_obj)) >= 0))
190 CvPADLIST (cv) = (AV *)av_pop ((AV *)*he); 409 CvPADLIST (cv) = (AV *)AvARRAY (av)[AvFILLp (av)--];
191 else 410 else
192 CvPADLIST (cv) = clone_padlist (CvPADLIST (cv));
193}
194
195STATIC void
196put_padlist (CV *cv)
197{
198 SV **he = hv_fetch (padlist_cache, (void *)&cv, sizeof (CV *), 1);
199
200 if (SvTYPE (*he) != SVt_PVAV)
201 { 411 {
412#if CORO_PREFER_PERL_FUNCTIONS
413 /* this is probably cleaner, but also slower? */
414 CV *cp = Perl_cv_clone (cv);
415 CvPADLIST (cv) = CvPADLIST (cp);
416 CvPADLIST (cp) = 0;
202 SvREFCNT_dec (*he); 417 SvREFCNT_dec (cp);
203 *he = (SV *)newAV (); 418#else
419 CvPADLIST (cv) = coro_clone_padlist (aTHX_ cv);
420#endif
204 } 421 }
205
206 av_push ((AV *)*he, (SV *)CvPADLIST (cv));
207} 422}
208
209#ifdef MAY_FLUSH
210STATIC void
211flush_padlist_cache ()
212{
213 HV *hv = padlist_cache;
214 padlist_cache = newHV ();
215
216 if (hv_iterinit (hv))
217 {
218 HE *he;
219 AV *padlist;
220
221 while (!!(he = hv_iternext (hv)))
222 {
223 AV *av = (AV *)HeVAL(he);
224
225 /* casting is fun. */
226 while (&PL_sv_undef != (SV *)(padlist = (AV *)av_pop (av)))
227 free_padlist (padlist);
228 }
229 }
230
231 SvREFCNT_dec (hv);
232}
233#endif
234
235#define SB do {
236#define SE } while (0)
237
238#define LOAD(state) SB load_state(aTHX_ state); SPAGAIN; SE
239#define SAVE(state,flags) SB PUTBACK; save_state(aTHX_ state,flags); SE
240
241#define REPLACE_SV(sv,val) SB SvREFCNT_dec(sv); (sv) = (val); SE
242 423
243static void 424static void
425put_padlist (pTHX_ CV *cv)
426{
427 MAGIC *mg = CORO_MAGIC_cv (cv);
428 AV *av;
429
430 if (expect_false (!mg))
431 mg = sv_magicext ((SV *)cv, (SV *)newAV (), CORO_MAGIC_type_cv, &coro_cv_vtbl, 0, 0);
432
433 av = (AV *)mg->mg_obj;
434
435 if (expect_false (AvFILLp (av) >= AvMAX (av)))
436 av_extend (av, AvMAX (av) + 1);
437
438 AvARRAY (av)[++AvFILLp (av)] = (SV *)CvPADLIST (cv);
439}
440
441/** load & save, init *******************************************************/
442
443static void
244load_state(pTHX_ Coro__State c) 444load_perl (pTHX_ Coro__State c)
245{ 445{
246 PL_dowarn = c->dowarn; 446 perl_slots *slot = c->slot;
447 c->slot = 0;
247 448
248 PL_curstackinfo = c->curstackinfo;
249 PL_curstack = c->curstack;
250 PL_mainstack = c->mainstack; 449 PL_mainstack = c->mainstack;
251 PL_stack_sp = c->stack_sp;
252 PL_op = c->op;
253 PL_curpad = c->curpad;
254 PL_stack_base = c->stack_base;
255 PL_stack_max = c->stack_max;
256 PL_tmps_stack = c->tmps_stack;
257 PL_tmps_floor = c->tmps_floor;
258 PL_tmps_ix = c->tmps_ix;
259 PL_tmps_max = c->tmps_max;
260 PL_markstack = c->markstack;
261 PL_markstack_ptr = c->markstack_ptr;
262 PL_markstack_max = c->markstack_max;
263 PL_scopestack = c->scopestack;
264 PL_scopestack_ix = c->scopestack_ix;
265 PL_scopestack_max = c->scopestack_max;
266 PL_savestack = c->savestack;
267 PL_savestack_ix = c->savestack_ix;
268 PL_savestack_max = c->savestack_max;
269 PL_retstack = c->retstack;
270 PL_retstack_ix = c->retstack_ix;
271 PL_retstack_max = c->retstack_max;
272 PL_curcop = c->curcop;
273 450
274 if (c->defav) REPLACE_SV (GvAV (PL_defgv), c->defav); 451 GvSV (PL_defgv) = slot->defsv;
275 if (c->defsv) REPLACE_SV (DEFSV , c->defsv); 452 GvAV (PL_defgv) = slot->defav;
276 if (c->errsv) REPLACE_SV (ERRSV , c->errsv); 453 GvSV (PL_errgv) = slot->errsv;
454 GvSV (irsgv) = slot->irsgv;
455
456 #define VAR(name,type) PL_ ## name = slot->name;
457 # include "state.h"
458 #undef VAR
277 459
278 { 460 {
279 dSP; 461 dSP;
462
280 CV *cv; 463 CV *cv;
281 464
282 /* now do the ugly restore mess */ 465 /* now do the ugly restore mess */
283 while ((cv = (CV *)POPs)) 466 while (expect_true (cv = (CV *)POPs))
284 { 467 {
285 AV *padlist = (AV *)POPs;
286
287 if (padlist)
288 {
289 put_padlist (cv); /* mark this padlist as available */ 468 put_padlist (aTHX_ cv); /* mark this padlist as available */
290 CvPADLIST(cv) = padlist; 469 CvDEPTH (cv) = PTR2IV (POPs);
291#ifdef USE_THREADS 470 CvPADLIST (cv) = (AV *)POPs;
292 /*CvOWNER(cv) = (struct perl_thread *)POPs;*/
293#endif
294 }
295
296 ++CvDEPTH(cv);
297 } 471 }
298 472
299 PUTBACK; 473 PUTBACK;
300 } 474 }
301} 475}
302 476
303static void 477static void
304save_state(pTHX_ Coro__State c, int flags) 478save_perl (pTHX_ Coro__State c)
305{ 479{
306 { 480 {
307 dSP; 481 dSP;
308 I32 cxix = cxstack_ix; 482 I32 cxix = cxstack_ix;
309 PERL_CONTEXT *ccstk = cxstack; 483 PERL_CONTEXT *ccstk = cxstack;
… …
312 /* 486 /*
313 * the worst thing you can imagine happens first - we have to save 487 * the worst thing you can imagine happens first - we have to save
314 * (and reinitialize) all cv's in the whole callchain :( 488 * (and reinitialize) all cv's in the whole callchain :(
315 */ 489 */
316 490
317 PUSHs (Nullsv); 491 XPUSHs (Nullsv);
318 /* this loop was inspired by pp_caller */ 492 /* this loop was inspired by pp_caller */
319 for (;;) 493 for (;;)
320 { 494 {
321 do 495 while (expect_true (cxix >= 0))
322 { 496 {
323 PERL_CONTEXT *cx = &ccstk[cxix--]; 497 PERL_CONTEXT *cx = &ccstk[cxix--];
324 498
325 if (CxTYPE(cx) == CXt_SUB) 499 if (expect_true (CxTYPE (cx) == CXt_SUB || CxTYPE (cx) == CXt_FORMAT))
326 { 500 {
327 CV *cv = cx->blk_sub.cv; 501 CV *cv = cx->blk_sub.cv;
502
328 if (CvDEPTH(cv)) 503 if (expect_true (CvDEPTH (cv)))
329 { 504 {
330#ifdef USE_THREADS
331 /*XPUSHs ((SV *)CvOWNER(cv));*/
332 /*CvOWNER(cv) = 0;*/
333 /*error must unlock this cv etc.. etc...*/
334#endif
335 EXTEND (SP, CvDEPTH(cv)*2); 505 EXTEND (SP, 3);
336
337 while (--CvDEPTH(cv))
338 {
339 /* this tells the restore code to increment CvDEPTH */
340 PUSHs (Nullsv);
341 PUSHs ((SV *)cv);
342 }
343
344 PUSHs ((SV *)CvPADLIST(cv)); 506 PUSHs ((SV *)CvPADLIST (cv));
507 PUSHs (INT2PTR (SV *, CvDEPTH (cv)));
345 PUSHs ((SV *)cv); 508 PUSHs ((SV *)cv);
346 509
347 get_padlist (cv); /* this is a monster */ 510 CvDEPTH (cv) = 0;
511 get_padlist (aTHX_ cv);
348 } 512 }
349 } 513 }
350 else if (CxTYPE(cx) == CXt_FORMAT) 514 }
515
516 if (expect_true (top_si->si_type == PERLSI_MAIN))
517 break;
518
519 top_si = top_si->si_prev;
520 ccstk = top_si->si_cxstack;
521 cxix = top_si->si_cxix;
522 }
523
524 PUTBACK;
525 }
526
527 /* allocate some space on the context stack for our purposes */
528 /* we manually unroll here, as usually 2 slots is enough */
529 if (SLOT_COUNT >= 1) CXINC;
530 if (SLOT_COUNT >= 2) CXINC;
531 if (SLOT_COUNT >= 3) CXINC;
532 {
533 int i;
534 for (i = 3; i < SLOT_COUNT; ++i)
535 CXINC;
536 }
537 cxstack_ix -= SLOT_COUNT; /* undo allocation */
538
539 c->mainstack = PL_mainstack;
540
541 {
542 perl_slots *slot = c->slot = (perl_slots *)(cxstack + cxstack_ix + 1);
543
544 slot->defav = GvAV (PL_defgv);
545 slot->defsv = DEFSV;
546 slot->errsv = ERRSV;
547 slot->irsgv = GvSV (irsgv);
548
549 #define VAR(name,type) slot->name = PL_ ## name;
550 # include "state.h"
551 #undef VAR
552 }
553}
554
555/*
556 * allocate various perl stacks. This is an exact copy
557 * of perl.c:init_stacks, except that it uses less memory
558 * on the (sometimes correct) assumption that coroutines do
559 * not usually need a lot of stackspace.
560 */
561#if CORO_PREFER_PERL_FUNCTIONS
562# define coro_init_stacks init_stacks
563#else
564static void
565coro_init_stacks (pTHX)
566{
567 PL_curstackinfo = new_stackinfo(32, 8);
568 PL_curstackinfo->si_type = PERLSI_MAIN;
569 PL_curstack = PL_curstackinfo->si_stack;
570 PL_mainstack = PL_curstack; /* remember in case we switch stacks */
571
572 PL_stack_base = AvARRAY(PL_curstack);
573 PL_stack_sp = PL_stack_base;
574 PL_stack_max = PL_stack_base + AvMAX(PL_curstack);
575
576 New(50,PL_tmps_stack,32,SV*);
577 PL_tmps_floor = -1;
578 PL_tmps_ix = -1;
579 PL_tmps_max = 32;
580
581 New(54,PL_markstack,16,I32);
582 PL_markstack_ptr = PL_markstack;
583 PL_markstack_max = PL_markstack + 16;
584
585#ifdef SET_MARK_OFFSET
586 SET_MARK_OFFSET;
587#endif
588
589 New(54,PL_scopestack,8,I32);
590 PL_scopestack_ix = 0;
591 PL_scopestack_max = 8;
592
593 New(54,PL_savestack,24,ANY);
594 PL_savestack_ix = 0;
595 PL_savestack_max = 24;
596
597#if !PERL_VERSION_ATLEAST (5,9,0)
598 New(54,PL_retstack,4,OP*);
599 PL_retstack_ix = 0;
600 PL_retstack_max = 4;
601#endif
602}
603#endif
604
605/*
606 * destroy the stacks, the callchain etc...
607 */
608static void
609coro_destroy_stacks (pTHX)
610{
611 while (PL_curstackinfo->si_next)
612 PL_curstackinfo = PL_curstackinfo->si_next;
613
614 while (PL_curstackinfo)
615 {
616 PERL_SI *p = PL_curstackinfo->si_prev;
617
618 if (!IN_DESTRUCT)
619 SvREFCNT_dec (PL_curstackinfo->si_stack);
620
621 Safefree (PL_curstackinfo->si_cxstack);
622 Safefree (PL_curstackinfo);
623 PL_curstackinfo = p;
624 }
625
626 Safefree (PL_tmps_stack);
627 Safefree (PL_markstack);
628 Safefree (PL_scopestack);
629 Safefree (PL_savestack);
630#if !PERL_VERSION_ATLEAST (5,9,0)
631 Safefree (PL_retstack);
632#endif
633}
634
635static size_t
636coro_rss (pTHX_ struct coro *coro)
637{
638 size_t rss = sizeof (*coro);
639
640 if (coro->mainstack)
641 {
642 perl_slots tmp_slot;
643 perl_slots *slot;
644
645 if (coro->flags & CF_RUNNING)
646 {
647 slot = &tmp_slot;
648
649 #define VAR(name,type) slot->name = PL_ ## name;
650 # include "state.h"
651 #undef VAR
652 }
653 else
654 slot = coro->slot;
655
656 rss += sizeof (slot->curstackinfo);
657 rss += (slot->curstackinfo->si_cxmax + 1) * sizeof (PERL_CONTEXT);
658 rss += sizeof (SV) + sizeof (struct xpvav) + (1 + AvMAX (slot->curstack)) * sizeof (SV *);
659 rss += slot->tmps_max * sizeof (SV *);
660 rss += (slot->markstack_max - slot->markstack_ptr) * sizeof (I32);
661 rss += slot->scopestack_max * sizeof (I32);
662 rss += slot->savestack_max * sizeof (ANY);
663
664#if !PERL_VERSION_ATLEAST (5,9,0)
665 rss += slot->retstack_max * sizeof (OP *);
666#endif
667 }
668
669 return rss;
670}
671
672/** coroutine stack handling ************************************************/
673
674static int (*orig_sigelem_get) (pTHX_ SV *sv, MAGIC *mg);
675static int (*orig_sigelem_set) (pTHX_ SV *sv, MAGIC *mg);
676
677/*
678 * This overrides the default magic get method of %SIG elements.
679 * The original one doesn't provide for reading back of PL_diehook/PL_warnhook
680 * and instead of tryign to save and restore the hash elements, we just provide
681 * readback here.
682 * We only do this when the hook is != 0, as they are often set to 0 temporarily,
683 * not expecting this to actually change the hook. This is a potential problem
684 * when a schedule happens then, but we ignore this.
685 */
686static int
687coro_sigelem_get (pTHX_ SV *sv, MAGIC *mg)
688{
689 const char *s = MgPV_nolen_const (mg);
690
691 if (*s == '_')
692 {
693 if (strEQ (s, "__DIE__" ) && PL_diehook ) return sv_setsv (sv, PL_diehook ), 0;
694 if (strEQ (s, "__WARN__") && PL_warnhook) return sv_setsv (sv, PL_warnhook), 0;
695 }
696
697 return orig_sigelem_get ? orig_sigelem_get (aTHX_ sv, mg) : 0;
698}
699
700static int
701coro_sigelem_set (pTHX_ SV *sv, MAGIC *mg)
702{
703 const char *s = MgPV_nolen_const (mg);
704
705 if (*s == '_')
706 {
707 SV **svp = 0;
708
709 if (strEQ (s, "__DIE__" )) svp = &PL_diehook;
710 if (strEQ (s, "__WARN__")) svp = &PL_warnhook;
711
712 if (svp)
713 {
714 SV *old = *svp;
715 *svp = newSVsv (sv);
716 SvREFCNT_dec (old);
717 return;
718 }
719 }
720
721 return orig_sigelem_set ? orig_sigelem_set (aTHX_ sv, mg) : 0;
722}
723
724static void
725coro_setup (pTHX_ struct coro *coro)
726{
727 /*
728 * emulate part of the perl startup here.
729 */
730 coro_init_stacks (aTHX);
731
732 PL_runops = RUNOPS_DEFAULT;
733 PL_curcop = &PL_compiling;
734 PL_in_eval = EVAL_NULL;
735 PL_comppad = 0;
736 PL_curpm = 0;
737 PL_curpad = 0;
738 PL_localizing = 0;
739 PL_dirty = 0;
740 PL_restartop = 0;
741
742 /* recreate the die/warn hooks */
743 PL_diehook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__DIE__" , sizeof ("__DIE__" ) - 1, 1), rv_diehook );
744 PL_warnhook = 0; SvSetMagicSV (*hv_fetch (hv_sig, "__WARN__", sizeof ("__WARN__") - 1, 1), rv_warnhook);
745
746 GvSV (PL_defgv) = newSV (0);
747 GvAV (PL_defgv) = coro->args; coro->args = 0;
748 GvSV (PL_errgv) = newSV (0);
749 GvSV (irsgv) = newSVpvn ("\n", 1); sv_magic (GvSV (irsgv), (SV *)irsgv, PERL_MAGIC_sv, "/", 0);
750 PL_rs = newSVsv (GvSV (irsgv));
751 PL_defoutgv = (GV *)SvREFCNT_inc (stdoutgv);
752
753 {
754 dSP;
755 LOGOP myop;
756
757 Zero (&myop, 1, LOGOP);
758 myop.op_next = Nullop;
759 myop.op_flags = OPf_WANT_VOID;
760
761 PUSHMARK (SP);
762 XPUSHs (sv_2mortal (av_shift (GvAV (PL_defgv))));
763 PUTBACK;
764 PL_op = (OP *)&myop;
765 PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
766 SPAGAIN;
767 }
768
769 /* this newly created coroutine might be run on an existing cctx which most
770 * likely was suspended in set_stacklevel, called from entersub.
771 * set_stacklevl doesn't do anything on return, but entersub does LEAVE,
772 * so we ENTER here for symmetry
773 */
774 ENTER;
775}
776
777static void
778coro_destroy (pTHX_ struct coro *coro)
779{
780 if (!IN_DESTRUCT)
781 {
782 /* restore all saved variables and stuff */
783 LEAVE_SCOPE (0);
784 assert (PL_tmps_floor == -1);
785
786 /* free all temporaries */
787 FREETMPS;
788 assert (PL_tmps_ix == -1);
789
790 /* unwind all extra stacks */
791 POPSTACK_TO (PL_mainstack);
792
793 /* unwind main stack */
794 dounwind (-1);
795 }
796
797 SvREFCNT_dec (GvSV (PL_defgv));
798 SvREFCNT_dec (GvAV (PL_defgv));
799 SvREFCNT_dec (GvSV (PL_errgv));
800 SvREFCNT_dec (PL_defoutgv);
801 SvREFCNT_dec (PL_rs);
802 SvREFCNT_dec (GvSV (irsgv));
803
804 SvREFCNT_dec (PL_diehook);
805 SvREFCNT_dec (PL_warnhook);
806
807 SvREFCNT_dec (coro->saved_deffh);
808 SvREFCNT_dec (coro->throw);
809
810 coro_destroy_stacks (aTHX);
811}
812
813static void
814free_coro_mortal (pTHX)
815{
816 if (expect_true (coro_mortal))
817 {
818 SvREFCNT_dec (coro_mortal);
819 coro_mortal = 0;
820 }
821}
822
823static int
824runops_trace (pTHX)
825{
826 COP *oldcop = 0;
827 int oldcxix = -2;
828 struct coro *coro = SvSTATE (coro_current); /* trace cctx is tied to specific coro */
829 coro_cctx *cctx = coro->cctx;
830
831 while ((PL_op = CALL_FPTR (PL_op->op_ppaddr) (aTHX)))
832 {
833 PERL_ASYNC_CHECK ();
834
835 if (cctx->flags & CC_TRACE_ALL)
836 {
837 if (PL_op->op_type == OP_LEAVESUB && cctx->flags & CC_TRACE_SUB)
838 {
839 PERL_CONTEXT *cx = &cxstack[cxstack_ix];
840 SV **bot, **top;
841 AV *av = newAV (); /* return values */
842 SV **cb;
843 dSP;
844
845 GV *gv = CvGV (cx->blk_sub.cv);
846 SV *fullname = sv_2mortal (newSV (0));
847 if (isGV (gv))
848 gv_efullname3 (fullname, gv, 0);
849
850 bot = PL_stack_base + cx->blk_oldsp + 1;
851 top = cx->blk_gimme == G_ARRAY ? SP + 1
852 : cx->blk_gimme == G_SCALAR ? bot + 1
853 : bot;
854
855 av_extend (av, top - bot);
856 while (bot < top)
857 av_push (av, SvREFCNT_inc (*bot++));
858
859 PL_runops = RUNOPS_DEFAULT;
860 ENTER;
861 SAVETMPS;
862 EXTEND (SP, 3);
863 PUSHMARK (SP);
864 PUSHs (&PL_sv_no);
865 PUSHs (fullname);
866 PUSHs (sv_2mortal (newRV_noinc ((SV *)av)));
867 PUTBACK;
868 cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
869 if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
870 SPAGAIN;
871 FREETMPS;
872 LEAVE;
873 PL_runops = runops_trace;
874 }
875
876 if (oldcop != PL_curcop)
877 {
878 oldcop = PL_curcop;
879
880 if (PL_curcop != &PL_compiling)
881 {
882 SV **cb;
883
884 if (oldcxix != cxstack_ix && cctx->flags & CC_TRACE_SUB)
885 {
886 PERL_CONTEXT *cx = &cxstack[cxstack_ix];
887
888 if (CxTYPE (cx) == CXt_SUB && oldcxix < cxstack_ix)
889 {
890 runops_proc_t old_runops = PL_runops;
891 dSP;
892 GV *gv = CvGV (cx->blk_sub.cv);
893 SV *fullname = sv_2mortal (newSV (0));
894
895 if (isGV (gv))
896 gv_efullname3 (fullname, gv, 0);
897
898 PL_runops = RUNOPS_DEFAULT;
899 ENTER;
900 SAVETMPS;
901 EXTEND (SP, 3);
902 PUSHMARK (SP);
903 PUSHs (&PL_sv_yes);
904 PUSHs (fullname);
905 PUSHs (CxHASARGS (cx) ? sv_2mortal (newRV_inc ((SV *)cx->blk_sub.argarray)) : &PL_sv_undef);
906 PUTBACK;
907 cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_sub_cb", sizeof ("_trace_sub_cb") - 1, 0);
908 if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
909 SPAGAIN;
910 FREETMPS;
911 LEAVE;
912 PL_runops = runops_trace;
913 }
914
915 oldcxix = cxstack_ix;
916 }
917
918 if (cctx->flags & CC_TRACE_LINE)
919 {
920 dSP;
921
922 PL_runops = RUNOPS_DEFAULT;
923 ENTER;
924 SAVETMPS;
925 EXTEND (SP, 3);
926 PL_runops = RUNOPS_DEFAULT;
927 PUSHMARK (SP);
928 PUSHs (sv_2mortal (newSVpv (OutCopFILE (oldcop), 0)));
929 PUSHs (sv_2mortal (newSViv (CopLINE (oldcop))));
930 PUTBACK;
931 cb = hv_fetch ((HV *)SvRV (coro_current), "_trace_line_cb", sizeof ("_trace_line_cb") - 1, 0);
932 if (cb) call_sv (*cb, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
933 SPAGAIN;
934 FREETMPS;
935 LEAVE;
936 PL_runops = runops_trace;
937 }
938 }
939 }
940 }
941 }
942
943 TAINT_NOT;
944 return 0;
945}
946
947/* inject a fake call to Coro::State::_cctx_init into the execution */
948/* _cctx_init should be careful, as it could be called at almost any time */
949/* during execution of a perl program */
950static void NOINLINE
951cctx_prepare (pTHX_ coro_cctx *cctx)
952{
953 dSP;
954 LOGOP myop;
955
956 PL_top_env = &PL_start_env;
957
958 if (cctx->flags & CC_TRACE)
959 PL_runops = runops_trace;
960
961 Zero (&myop, 1, LOGOP);
962 myop.op_next = PL_op;
963 myop.op_flags = OPf_WANT_VOID | OPf_STACKED;
964
965 PUSHMARK (SP);
966 EXTEND (SP, 2);
967 PUSHs (sv_2mortal (newSViv (PTR2IV (cctx))));
968 PUSHs ((SV *)get_cv ("Coro::State::_cctx_init", FALSE));
969 PUTBACK;
970 PL_op = (OP *)&myop;
971 PL_op = PL_ppaddr[OP_ENTERSUB](aTHX);
972 SPAGAIN;
973}
974
975/*
976 * this is a _very_ stripped down perl interpreter ;)
977 */
978static void
979cctx_run (void *arg)
980{
981 dTHX;
982
983 /* cctx_run is the alternative tail of transfer(), so unlock here. */
984 UNLOCK;
985
986 /* we now skip the entersub that lead to transfer() */
987 PL_op = PL_op->op_next;
988
989 /* inject a fake subroutine call to cctx_init */
990 cctx_prepare (aTHX_ (coro_cctx *)arg);
991
992 /* somebody or something will hit me for both perl_run and PL_restartop */
993 PL_restartop = PL_op;
994 perl_run (PL_curinterp);
995
996 /*
997 * If perl-run returns we assume exit() was being called or the coro
998 * fell off the end, which seems to be the only valid (non-bug)
999 * reason for perl_run to return. We try to exit by jumping to the
1000 * bootstrap-time "top" top_env, as we cannot restore the "main"
1001 * coroutine as Coro has no such concept
1002 */
1003 PL_top_env = main_top_env;
1004 JMPENV_JUMP (2); /* I do not feel well about the hardcoded 2 at all */
1005}
1006
1007static coro_cctx *
1008cctx_new ()
1009{
1010 coro_cctx *cctx;
1011 void *stack_start;
1012 size_t stack_size;
1013
1014 ++cctx_count;
1015
1016 Newz (0, cctx, 1, coro_cctx);
1017
1018#if HAVE_MMAP
1019 cctx->ssize = ((coro_stacksize * sizeof (long) + PAGESIZE - 1) / PAGESIZE + CORO_STACKGUARD) * PAGESIZE;
1020 /* mmap supposedly does allocate-on-write for us */
1021 cctx->sptr = mmap (0, cctx->ssize, PROT_EXEC|PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
1022
1023 if (cctx->sptr != (void *)-1)
1024 {
1025# if CORO_STACKGUARD
1026 mprotect (cctx->sptr, CORO_STACKGUARD * PAGESIZE, PROT_NONE);
1027# endif
1028 stack_start = CORO_STACKGUARD * PAGESIZE + (char *)cctx->sptr;
1029 stack_size = cctx->ssize - CORO_STACKGUARD * PAGESIZE;
1030 cctx->flags |= CC_MAPPED;
1031 }
1032 else
1033#endif
1034 {
1035 cctx->ssize = coro_stacksize * (long)sizeof (long);
1036 New (0, cctx->sptr, coro_stacksize, long);
1037
1038 if (!cctx->sptr)
1039 {
1040 perror ("FATAL: unable to allocate stack for coroutine");
1041 _exit (EXIT_FAILURE);
1042 }
1043
1044 stack_start = cctx->sptr;
1045 stack_size = cctx->ssize;
1046 }
1047
1048 REGISTER_STACK (cctx, (char *)stack_start, (char *)stack_start + stack_size);
1049 coro_create (&cctx->cctx, cctx_run, (void *)cctx, stack_start, stack_size);
1050
1051 return cctx;
1052}
1053
1054static void
1055cctx_destroy (coro_cctx *cctx)
1056{
1057 if (!cctx)
1058 return;
1059
1060 --cctx_count;
1061
1062#if CORO_USE_VALGRIND
1063 VALGRIND_STACK_DEREGISTER (cctx->valgrind_id);
1064#endif
1065
1066#if HAVE_MMAP
1067 if (cctx->flags & CC_MAPPED)
1068 munmap (cctx->sptr, cctx->ssize);
1069 else
1070#endif
1071 Safefree (cctx->sptr);
1072
1073 Safefree (cctx);
1074}
1075
1076/* wether this cctx should be destructed */
1077#define CCTX_EXPIRED(cctx) ((cctx)->ssize < coro_stacksize || ((cctx)->flags & CC_NOREUSE))
1078
1079static coro_cctx *
1080cctx_get (pTHX)
1081{
1082 while (expect_true (cctx_first))
1083 {
1084 coro_cctx *cctx = cctx_first;
1085 cctx_first = cctx->next;
1086 --cctx_idle;
1087
1088 if (expect_true (!CCTX_EXPIRED (cctx)))
1089 return cctx;
1090
1091 cctx_destroy (cctx);
1092 }
1093
1094 return cctx_new ();
1095}
1096
1097static void
1098cctx_put (coro_cctx *cctx)
1099{
1100 /* free another cctx if overlimit */
1101 if (expect_false (cctx_idle >= MAX_IDLE_CCTX))
1102 {
1103 coro_cctx *first = cctx_first;
1104 cctx_first = first->next;
1105 --cctx_idle;
1106
1107 cctx_destroy (first);
1108 }
1109
1110 ++cctx_idle;
1111 cctx->next = cctx_first;
1112 cctx_first = cctx;
1113}
1114
1115/** coroutine switching *****************************************************/
1116
1117static void
1118transfer_check (pTHX_ struct coro *prev, struct coro *next)
1119{
1120 if (expect_true (prev != next))
1121 {
1122 if (expect_false (!(prev->flags & (CF_RUNNING | CF_NEW))))
1123 croak ("Coro::State::transfer called with non-running/new prev Coro::State, but can only transfer from running or new states");
1124
1125 if (expect_false (next->flags & CF_RUNNING))
1126 croak ("Coro::State::transfer called with running next Coro::State, but can only transfer to inactive states");
1127
1128 if (expect_false (next->flags & CF_DESTROYED))
1129 croak ("Coro::State::transfer called with destroyed next Coro::State, but can only transfer to inactive states");
1130
1131 if (
1132#if PERL_VERSION_ATLEAST (5,9,0)
1133 expect_false (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
1134#else
1135 expect_false (PL_lex_state != LEX_NOTPARSING)
1136#endif
1137 )
1138 croak ("Coro::State::transfer called while parsing, but this is not supported");
1139 }
1140}
1141
1142/* always use the TRANSFER macro */
1143static void NOINLINE
1144transfer (pTHX_ struct coro *prev, struct coro *next)
1145{
1146 dSTACKLEVEL;
1147 static volatile int has_throw;
1148
1149 /* sometimes transfer is only called to set idle_sp */
1150 if (expect_false (!next))
1151 {
1152 ((coro_cctx *)prev)->idle_sp = STACKLEVEL;
1153 assert (((coro_cctx *)prev)->idle_te = PL_top_env); /* just for the side-effect when asserts are enabled */
1154 }
1155 else if (expect_true (prev != next))
1156 {
1157 coro_cctx *prev__cctx;
1158
1159 if (expect_false (prev->flags & CF_NEW))
1160 {
1161 /* create a new empty context */
1162 Newz (0, prev->cctx, 1, coro_cctx);
1163 prev->flags &= ~CF_NEW;
1164 prev->flags |= CF_RUNNING;
1165 }
1166
1167 prev->flags &= ~CF_RUNNING;
1168 next->flags |= CF_RUNNING;
1169
1170 LOCK;
1171
1172 /* first get rid of the old state */
1173 save_perl (aTHX_ prev);
1174
1175 if (expect_false (next->flags & CF_NEW))
1176 {
1177 /* need to start coroutine */
1178 next->flags &= ~CF_NEW;
1179 /* setup coroutine call */
1180 coro_setup (aTHX_ next);
1181 }
1182 else
1183 load_perl (aTHX_ next);
1184
1185 prev__cctx = prev->cctx;
1186
1187 /* possibly "free" the cctx */
1188 if (expect_true (prev__cctx->idle_sp == STACKLEVEL && !(prev__cctx->flags & CC_TRACE)))
1189 {
1190 /* I assume that STACKLEVEL is a stronger indicator than PL_top_env changes */
1191 assert (("ERROR: current top_env must equal previous top_env", PL_top_env == prev__cctx->idle_te));
1192
1193 prev->cctx = 0;
1194
1195 /* if the cctx is about to be destroyed we need to make sure we won't see it in cctx_get */
1196 /* without this the next cctx_get might destroy the prev__cctx while still in use */
1197 if (expect_false (CCTX_EXPIRED (prev__cctx)))
1198 if (!next->cctx)
1199 next->cctx = cctx_get (aTHX);
1200
1201 cctx_put (prev__cctx);
1202 }
1203
1204 ++next->usecount;
1205
1206 if (expect_true (!next->cctx))
1207 next->cctx = cctx_get (aTHX);
1208
1209 has_throw = !!next->throw;
1210
1211 if (expect_false (prev__cctx != next->cctx))
1212 {
1213 prev__cctx->top_env = PL_top_env;
1214 PL_top_env = next->cctx->top_env;
1215 coro_transfer (&prev__cctx->cctx, &next->cctx->cctx);
1216 }
1217
1218 free_coro_mortal (aTHX);
1219 UNLOCK;
1220
1221 if (expect_false (has_throw))
1222 {
1223 struct coro *coro = SvSTATE (coro_current);
1224
1225 if (coro->throw)
1226 {
1227 SV *exception = coro->throw;
1228 coro->throw = 0;
1229 sv_setsv (ERRSV, exception);
1230 croak (0);
1231 }
1232 }
1233 }
1234}
1235
1236struct transfer_args
1237{
1238 struct coro *prev, *next;
1239};
1240
1241#define TRANSFER(ta) transfer (aTHX_ (ta).prev, (ta).next)
1242#define TRANSFER_CHECK(ta) transfer_check (aTHX_ (ta).prev, (ta).next)
1243
1244/** high level stuff ********************************************************/
1245
1246static int
1247coro_state_destroy (pTHX_ struct coro *coro)
1248{
1249 if (coro->flags & CF_DESTROYED)
1250 return 0;
1251
1252 coro->flags |= CF_DESTROYED;
1253
1254 if (coro->flags & CF_READY)
1255 {
1256 /* reduce nready, as destroying a ready coro effectively unreadies it */
1257 /* alternative: look through all ready queues and remove the coro */
1258 LOCK;
1259 --coro_nready;
1260 UNLOCK;
1261 }
1262 else
1263 coro->flags |= CF_READY; /* make sure it is NOT put into the readyqueue */
1264
1265 if (coro->mainstack && coro->mainstack != main_mainstack)
1266 {
1267 struct coro temp;
1268
1269 if (coro->flags & CF_RUNNING)
1270 croak ("FATAL: tried to destroy currently running coroutine");
1271
1272 save_perl (aTHX_ &temp);
1273 load_perl (aTHX_ coro);
1274
1275 coro_destroy (aTHX_ coro);
1276
1277 load_perl (aTHX_ &temp);
1278
1279 coro->slot = 0;
1280 }
1281
1282 cctx_destroy (coro->cctx);
1283 SvREFCNT_dec (coro->args);
1284
1285 if (coro->next) coro->next->prev = coro->prev;
1286 if (coro->prev) coro->prev->next = coro->next;
1287 if (coro == coro_first) coro_first = coro->next;
1288
1289 return 1;
1290}
1291
1292static int
1293coro_state_free (pTHX_ SV *sv, MAGIC *mg)
1294{
1295 struct coro *coro = (struct coro *)mg->mg_ptr;
1296 mg->mg_ptr = 0;
1297
1298 coro->hv = 0;
1299
1300 if (--coro->refcnt < 0)
1301 {
1302 coro_state_destroy (aTHX_ coro);
1303 Safefree (coro);
1304 }
1305
1306 return 0;
1307}
1308
1309static int
1310coro_state_dup (pTHX_ MAGIC *mg, CLONE_PARAMS *params)
1311{
1312 struct coro *coro = (struct coro *)mg->mg_ptr;
1313
1314 ++coro->refcnt;
1315
1316 return 0;
1317}
1318
1319static MGVTBL coro_state_vtbl = {
1320 0, 0, 0, 0,
1321 coro_state_free,
1322 0,
1323#ifdef MGf_DUP
1324 coro_state_dup,
1325#else
1326# define MGf_DUP 0
1327#endif
1328};
1329
1330static void
1331prepare_transfer (pTHX_ struct transfer_args *ta, SV *prev_sv, SV *next_sv)
1332{
1333 ta->prev = SvSTATE (prev_sv);
1334 ta->next = SvSTATE (next_sv);
1335 TRANSFER_CHECK (*ta);
1336}
1337
1338static void
1339api_transfer (SV *prev_sv, SV *next_sv)
1340{
1341 dTHX;
1342 struct transfer_args ta;
1343
1344 prepare_transfer (aTHX_ &ta, prev_sv, next_sv);
1345 TRANSFER (ta);
1346}
1347
1348/** Coro ********************************************************************/
1349
1350static void
1351coro_enq (pTHX_ SV *coro_sv)
1352{
1353 av_push (coro_ready [SvSTATE (coro_sv)->prio - PRIO_MIN], coro_sv);
1354}
1355
1356static SV *
1357coro_deq (pTHX)
1358{
1359 int prio;
1360
1361 for (prio = PRIO_MAX - PRIO_MIN + 1; --prio >= 0; )
1362 if (AvFILLp (coro_ready [prio]) >= 0)
1363 return av_shift (coro_ready [prio]);
1364
1365 return 0;
1366}
1367
1368static int
1369api_ready (SV *coro_sv)
1370{
1371 dTHX;
1372 struct coro *coro;
1373
1374 if (SvROK (coro_sv))
1375 coro_sv = SvRV (coro_sv);
1376
1377 coro = SvSTATE (coro_sv);
1378
1379 if (coro->flags & CF_READY)
1380 return 0;
1381
1382 coro->flags |= CF_READY;
1383
1384 LOCK;
1385 coro_enq (aTHX_ SvREFCNT_inc (coro_sv));
1386 ++coro_nready;
1387 UNLOCK;
1388
1389 return 1;
1390}
1391
1392static int
1393api_is_ready (SV *coro_sv)
1394{
1395 dTHX;
1396 return !!(SvSTATE (coro_sv)->flags & CF_READY);
1397}
1398
1399static void
1400prepare_schedule (pTHX_ struct transfer_args *ta)
1401{
1402 SV *prev_sv, *next_sv;
1403
1404 for (;;)
1405 {
1406 LOCK;
1407 next_sv = coro_deq (aTHX);
1408
1409 /* nothing to schedule: call the idle handler */
1410 if (expect_false (!next_sv))
1411 {
1412 dSP;
1413 UNLOCK;
1414
1415 ENTER;
1416 SAVETMPS;
1417
1418 PUSHMARK (SP);
1419 PUTBACK;
1420 call_sv (get_sv ("Coro::idle", FALSE), G_DISCARD);
1421 SPAGAIN;
1422
1423 FREETMPS;
1424 LEAVE;
1425 continue;
1426 }
1427
1428 ta->next = SvSTATE (next_sv);
1429
1430 /* cannot transfer to destroyed coros, skip and look for next */
1431 if (expect_false (ta->next->flags & CF_DESTROYED))
1432 {
1433 UNLOCK;
1434 SvREFCNT_dec (next_sv);
1435 /* coro_nready is already taken care of by destroy */
1436 continue;
1437 }
1438
1439 --coro_nready;
1440 UNLOCK;
1441 break;
1442 }
1443
1444 /* free this only after the transfer */
1445 prev_sv = SvRV (coro_current);
1446 ta->prev = SvSTATE (prev_sv);
1447 TRANSFER_CHECK (*ta);
1448 assert (ta->next->flags & CF_READY);
1449 ta->next->flags &= ~CF_READY;
1450 SvRV_set (coro_current, next_sv);
1451
1452 LOCK;
1453 free_coro_mortal (aTHX);
1454 coro_mortal = prev_sv;
1455 UNLOCK;
1456}
1457
1458static void
1459prepare_cede (pTHX_ struct transfer_args *ta)
1460{
1461 api_ready (coro_current);
1462 prepare_schedule (aTHX_ ta);
1463}
1464
1465static int
1466prepare_cede_notself (pTHX_ struct transfer_args *ta)
1467{
1468 if (coro_nready)
1469 {
1470 SV *prev = SvRV (coro_current);
1471 prepare_schedule (aTHX_ ta);
1472 api_ready (prev);
1473 return 1;
1474 }
1475 else
1476 return 0;
1477}
1478
1479static void
1480api_schedule (void)
1481{
1482 dTHX;
1483 struct transfer_args ta;
1484
1485 prepare_schedule (aTHX_ &ta);
1486 TRANSFER (ta);
1487}
1488
1489static int
1490api_cede (void)
1491{
1492 dTHX;
1493 struct transfer_args ta;
1494
1495 prepare_cede (aTHX_ &ta);
1496
1497 if (expect_true (ta.prev != ta.next))
1498 {
1499 TRANSFER (ta);
1500 return 1;
1501 }
1502 else
1503 return 0;
1504}
1505
1506static int
1507api_cede_notself (void)
1508{
1509 dTHX;
1510 struct transfer_args ta;
1511
1512 if (prepare_cede_notself (aTHX_ &ta))
1513 {
1514 TRANSFER (ta);
1515 return 1;
1516 }
1517 else
1518 return 0;
1519}
1520
1521static void
1522api_trace (SV *coro_sv, int flags)
1523{
1524 dTHX;
1525 struct coro *coro = SvSTATE (coro_sv);
1526
1527 if (flags & CC_TRACE)
1528 {
1529 if (!coro->cctx)
1530 coro->cctx = cctx_new ();
1531 else if (!(coro->cctx->flags & CC_TRACE))
1532 croak ("cannot enable tracing on coroutine with custom stack");
1533
1534 coro->cctx->flags |= CC_NOREUSE | (flags & (CC_TRACE | CC_TRACE_ALL));
1535 }
1536 else if (coro->cctx && coro->cctx->flags & CC_TRACE)
1537 {
1538 coro->cctx->flags &= ~(CC_TRACE | CC_TRACE_ALL);
1539
1540 if (coro->flags & CF_RUNNING)
1541 PL_runops = RUNOPS_DEFAULT;
1542 else
1543 coro->slot->runops = RUNOPS_DEFAULT;
1544 }
1545}
1546
1547MODULE = Coro::State PACKAGE = Coro::State PREFIX = api_
1548
1549PROTOTYPES: DISABLE
1550
1551BOOT:
1552{
1553#ifdef USE_ITHREADS
1554 MUTEX_INIT (&coro_mutex);
1555#endif
1556 BOOT_PAGESIZE;
1557
1558 irsgv = gv_fetchpv ("/" , GV_ADD|GV_NOTQUAL, SVt_PV);
1559 stdoutgv = gv_fetchpv ("STDOUT", GV_ADD|GV_NOTQUAL, SVt_PVIO);
1560
1561 orig_sigelem_get = PL_vtbl_sigelem.svt_get;
1562 PL_vtbl_sigelem.svt_get = coro_sigelem_get;
1563 orig_sigelem_set = PL_vtbl_sigelem.svt_set;
1564 PL_vtbl_sigelem.svt_set = coro_sigelem_set;
1565
1566 hv_sig = coro_get_hv (aTHX_ "SIG", TRUE);
1567 rv_diehook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::diehook" , 0, SVt_PVCV));
1568 rv_warnhook = newRV_inc ((SV *)gv_fetchpv ("Coro::State::warnhook", 0, SVt_PVCV));
1569
1570 coro_state_stash = gv_stashpv ("Coro::State", TRUE);
1571
1572 newCONSTSUB (coro_state_stash, "CC_TRACE" , newSViv (CC_TRACE));
1573 newCONSTSUB (coro_state_stash, "CC_TRACE_SUB" , newSViv (CC_TRACE_SUB));
1574 newCONSTSUB (coro_state_stash, "CC_TRACE_LINE", newSViv (CC_TRACE_LINE));
1575 newCONSTSUB (coro_state_stash, "CC_TRACE_ALL" , newSViv (CC_TRACE_ALL));
1576
1577 main_mainstack = PL_mainstack;
1578 main_top_env = PL_top_env;
1579
1580 while (main_top_env->je_prev)
1581 main_top_env = main_top_env->je_prev;
1582
1583 coroapi.ver = CORO_API_VERSION;
1584 coroapi.rev = CORO_API_REVISION;
1585 coroapi.transfer = api_transfer;
1586
1587 assert (("PRIO_NORMAL must be 0", !PRIO_NORMAL));
1588}
1589
1590SV *
1591new (char *klass, ...)
1592 CODE:
1593{
1594 struct coro *coro;
1595 MAGIC *mg;
1596 HV *hv;
1597 int i;
1598
1599 Newz (0, coro, 1, struct coro);
1600 coro->args = newAV ();
1601 coro->flags = CF_NEW;
1602
1603 if (coro_first) coro_first->prev = coro;
1604 coro->next = coro_first;
1605 coro_first = coro;
1606
1607 coro->hv = hv = newHV ();
1608 mg = sv_magicext ((SV *)hv, 0, CORO_MAGIC_type_state, &coro_state_vtbl, (char *)coro, 0);
1609 mg->mg_flags |= MGf_DUP;
1610 RETVAL = sv_bless (newRV_noinc ((SV *)hv), gv_stashpv (klass, 1));
1611
1612 av_extend (coro->args, items - 1);
1613 for (i = 1; i < items; i++)
1614 av_push (coro->args, newSVsv (ST (i)));
1615}
1616 OUTPUT:
1617 RETVAL
1618
1619# these not obviously related functions are all rolled into the same xs
1620# function to increase chances that they all will call transfer with the same
1621# stack offset
1622void
1623_set_stacklevel (...)
1624 ALIAS:
1625 Coro::State::transfer = 1
1626 Coro::schedule = 2
1627 Coro::cede = 3
1628 Coro::cede_notself = 4
1629 CODE:
1630{
1631 struct transfer_args ta;
1632
1633 PUTBACK;
1634 switch (ix)
1635 {
1636 case 0:
1637 ta.prev = (struct coro *)INT2PTR (coro_cctx *, SvIV (ST (0)));
1638 ta.next = 0;
1639 break;
1640
1641 case 1:
1642 if (items != 2)
1643 croak ("Coro::State::transfer (prev,next) expects two arguments, not %d", items);
1644
1645 prepare_transfer (aTHX_ &ta, ST (0), ST (1));
1646 break;
1647
1648 case 2:
1649 prepare_schedule (aTHX_ &ta);
1650 break;
1651
1652 case 3:
1653 prepare_cede (aTHX_ &ta);
1654 break;
1655
1656 case 4:
1657 if (!prepare_cede_notself (aTHX_ &ta))
1658 XSRETURN_EMPTY;
1659
1660 break;
1661 }
1662 SPAGAIN;
1663
1664 BARRIER;
1665 PUTBACK;
1666 TRANSFER (ta);
1667 SPAGAIN; /* might be the sp of a different coroutine now */
1668 /* be extra careful not to ever do anything after TRANSFER */
1669}
1670
1671bool
1672_destroy (SV *coro_sv)
1673 CODE:
1674 RETVAL = coro_state_destroy (aTHX_ SvSTATE (coro_sv));
1675 OUTPUT:
1676 RETVAL
1677
1678void
1679_exit (code)
1680 int code
1681 PROTOTYPE: $
1682 CODE:
1683 _exit (code);
1684
1685int
1686cctx_stacksize (int new_stacksize = 0)
1687 CODE:
1688 RETVAL = coro_stacksize;
1689 if (new_stacksize)
1690 coro_stacksize = new_stacksize;
1691 OUTPUT:
1692 RETVAL
1693
1694int
1695cctx_count ()
1696 CODE:
1697 RETVAL = cctx_count;
1698 OUTPUT:
1699 RETVAL
1700
1701int
1702cctx_idle ()
1703 CODE:
1704 RETVAL = cctx_idle;
1705 OUTPUT:
1706 RETVAL
1707
1708void
1709list ()
1710 PPCODE:
1711{
1712 struct coro *coro;
1713 for (coro = coro_first; coro; coro = coro->next)
1714 if (coro->hv)
1715 XPUSHs (sv_2mortal (newRV_inc ((SV *)coro->hv)));
1716}
1717
1718void
1719call (Coro::State coro, SV *coderef)
1720 ALIAS:
1721 eval = 1
1722 CODE:
1723{
1724 if (coro->mainstack)
1725 {
1726 struct coro temp;
1727
1728 if (!(coro->flags & CF_RUNNING))
351 { 1729 {
352 /* I never used formats, so how should I know how these are implemented? */ 1730 PUTBACK;
353 /* my bold guess is as a simple, plain sub... */ 1731 save_perl (aTHX_ &temp);
354 croak ("CXt_FORMAT not yet handled. Don't switch coroutines from within formats"); 1732 load_perl (aTHX_ coro);
1733 }
1734
1735 {
1736 dSP;
1737 ENTER;
1738 SAVETMPS;
1739 PUTBACK;
1740 PUSHSTACK;
1741 PUSHMARK (SP);
1742
1743 if (ix)
1744 eval_sv (coderef, 0);
1745 else
1746 call_sv (coderef, G_KEEPERR | G_EVAL | G_VOID | G_DISCARD);
1747
1748 POPSTACK;
1749 SPAGAIN;
1750 FREETMPS;
1751 LEAVE;
1752 PUTBACK;
1753 }
1754
1755 if (!(coro->flags & CF_RUNNING))
1756 {
1757 save_perl (aTHX_ coro);
1758 load_perl (aTHX_ &temp);
1759 SPAGAIN;
355 } 1760 }
356 } 1761 }
357 while (cxix >= 0); 1762}
358 1763
359 if (top_si->si_type == PERLSI_MAIN) 1764SV *
360 break; 1765is_ready (Coro::State coro)
1766 PROTOTYPE: $
1767 ALIAS:
1768 is_ready = CF_READY
1769 is_running = CF_RUNNING
1770 is_new = CF_NEW
1771 is_destroyed = CF_DESTROYED
1772 CODE:
1773 RETVAL = boolSV (coro->flags & ix);
1774 OUTPUT:
1775 RETVAL
361 1776
362 top_si = top_si->si_prev; 1777void
363 ccstk = top_si->si_cxstack; 1778api_trace (SV *coro, int flags = CC_TRACE | CC_TRACE_SUB)
364 cxix = top_si->si_cxix; 1779
1780SV *
1781has_stack (Coro::State coro)
1782 PROTOTYPE: $
1783 CODE:
1784 RETVAL = boolSV (!!coro->cctx);
1785 OUTPUT:
1786 RETVAL
1787
1788int
1789is_traced (Coro::State coro)
1790 PROTOTYPE: $
1791 CODE:
1792 RETVAL = (coro->cctx ? coro->cctx->flags : 0) & CC_TRACE_ALL;
1793 OUTPUT:
1794 RETVAL
1795
1796IV
1797rss (Coro::State coro)
1798 PROTOTYPE: $
1799 ALIAS:
1800 usecount = 1
1801 CODE:
1802 switch (ix)
1803 {
1804 case 0: RETVAL = coro_rss (aTHX_ coro); break;
1805 case 1: RETVAL = coro->usecount; break;
365 } 1806 }
1807 OUTPUT:
1808 RETVAL
366 1809
367 PUTBACK;
368 }
369 1810
370 c->defav = flags & TRANSFER_SAVE_DEFAV ? (AV *)SvREFCNT_inc (GvAV (PL_defgv)) : 0; 1811MODULE = Coro::State PACKAGE = Coro
371 c->defsv = flags & TRANSFER_SAVE_DEFSV ? SvREFCNT_inc (DEFSV) : 0;
372 c->errsv = flags & TRANSFER_SAVE_ERRSV ? SvREFCNT_inc (ERRSV) : 0;
373 1812
374 /* I have not the slightest idea of why av_reify is necessary */ 1813BOOT:
375 /* but if it's missing the defav contents magically get replaced sometimes */
376 if (c->defav)
377 av_reify (c->defav);
378
379 c->dowarn = PL_dowarn;
380
381 c->curstackinfo = PL_curstackinfo;
382 c->curstack = PL_curstack;
383 c->mainstack = PL_mainstack;
384 c->stack_sp = PL_stack_sp;
385 c->op = PL_op;
386 c->curpad = PL_curpad;
387 c->stack_base = PL_stack_base;
388 c->stack_max = PL_stack_max;
389 c->tmps_stack = PL_tmps_stack;
390 c->tmps_floor = PL_tmps_floor;
391 c->tmps_ix = PL_tmps_ix;
392 c->tmps_max = PL_tmps_max;
393 c->markstack = PL_markstack;
394 c->markstack_ptr = PL_markstack_ptr;
395 c->markstack_max = PL_markstack_max;
396 c->scopestack = PL_scopestack;
397 c->scopestack_ix = PL_scopestack_ix;
398 c->scopestack_max = PL_scopestack_max;
399 c->savestack = PL_savestack;
400 c->savestack_ix = PL_savestack_ix;
401 c->savestack_max = PL_savestack_max;
402 c->retstack = PL_retstack;
403 c->retstack_ix = PL_retstack_ix;
404 c->retstack_max = PL_retstack_max;
405 c->curcop = PL_curcop;
406}
407
408/*
409 * destroy the stacks, the callchain etc...
410 * still there is a memleak of 128 bytes...
411 */
412STATIC void
413destroy_stacks(pTHX)
414{ 1814{
415 /* is this ugly, I ask? */ 1815 int i;
416 while (PL_scopestack_ix)
417 LEAVE;
418 1816
419 /* sure it is, but more important: is it correct?? :/ */ 1817 sv_pool_rss = coro_get_sv (aTHX_ "Coro::POOL_RSS" , TRUE);
420 while (PL_tmps_ix > PL_tmps_floor) /* should only ever be one iteration */ 1818 sv_pool_size = coro_get_sv (aTHX_ "Coro::POOL_SIZE" , TRUE);
421 FREETMPS; 1819 av_async_pool = coro_get_av (aTHX_ "Coro::async_pool", TRUE);
422 1820
423 while (PL_curstackinfo->si_next) 1821 coro_current = coro_get_sv (aTHX_ "Coro::current", FALSE);
424 PL_curstackinfo = PL_curstackinfo->si_next; 1822 SvREADONLY_on (coro_current);
425 1823
426 while (PL_curstackinfo) 1824 coro_stash = gv_stashpv ("Coro", TRUE);
427 {
428 PERL_SI *p = PL_curstackinfo->si_prev;
429 1825
430 { 1826 newCONSTSUB (coro_stash, "PRIO_MAX", newSViv (PRIO_MAX));
431 dSP; 1827 newCONSTSUB (coro_stash, "PRIO_HIGH", newSViv (PRIO_HIGH));
432 SWITCHSTACK (PL_curstack, PL_curstackinfo->si_stack); 1828 newCONSTSUB (coro_stash, "PRIO_NORMAL", newSViv (PRIO_NORMAL));
433 PUTBACK; /* possibly superfluous */ 1829 newCONSTSUB (coro_stash, "PRIO_LOW", newSViv (PRIO_LOW));
434 } 1830 newCONSTSUB (coro_stash, "PRIO_IDLE", newSViv (PRIO_IDLE));
1831 newCONSTSUB (coro_stash, "PRIO_MIN", newSViv (PRIO_MIN));
435 1832
436 dounwind(-1); 1833 for (i = PRIO_MAX - PRIO_MIN + 1; i--; )
1834 coro_ready[i] = newAV ();
437 1835
438 SvREFCNT_dec(PL_curstackinfo->si_stack);
439 Safefree(PL_curstackinfo->si_cxstack);
440 Safefree(PL_curstackinfo);
441 PL_curstackinfo = p;
442 }
443
444 Safefree(PL_tmps_stack);
445 Safefree(PL_markstack);
446 Safefree(PL_scopestack);
447 Safefree(PL_savestack);
448 Safefree(PL_retstack);
449}
450
451STATIC void
452transfer(pTHX_ struct coro *prev, struct coro *next, int flags)
453{
454 dSP;
455
456 if (prev != next)
457 {
458 /*
459 * this could be done in newprocess which would lead to
460 * extremely elegant and fast (just SAVE/LOAD)
461 * code here, but lazy allocation of stacks has also
462 * some virtues and the overhead of the if() is nil.
463 */
464 if (next->mainstack)
465 { 1836 {
466 SAVE (prev, flags); 1837 SV *sv = perl_get_sv ("Coro::API", TRUE);
467 LOAD (next); 1838 perl_get_sv ("Coro::API", TRUE); /* silence 5.10 warning */
468 /* mark this state as in-use */ 1839
469 next->mainstack = 0; 1840 coroapi.schedule = api_schedule;
470 next->tmps_ix = -2; 1841 coroapi.cede = api_cede;
1842 coroapi.cede_notself = api_cede_notself;
1843 coroapi.ready = api_ready;
1844 coroapi.is_ready = api_is_ready;
1845 coroapi.nready = &coro_nready;
1846 coroapi.current = coro_current;
1847
1848 GCoroAPI = &coroapi;
1849 sv_setiv (sv, (IV)&coroapi);
1850 SvREADONLY_on (sv);
471 } 1851 }
472 else if (next->tmps_ix == -2)
473 {
474 croak ("tried to transfer to running coroutine");
475 }
476 else
477 {
478 /*
479 * emulate part of the perl startup here.
480 */
481 UNOP myop;
482
483 SAVE (prev, -1); /* first get rid of the old state */
484
485 init_stacks (); /* from perl.c */
486 SPAGAIN;
487
488 PL_op = (OP *)&myop;
489 /*PL_curcop = 0;*/
490 SvREFCNT_dec (GvAV (PL_defgv));
491 GvAV (PL_defgv) = next->args;
492
493 Zero(&myop, 1, UNOP);
494 myop.op_next = Nullop;
495 myop.op_flags = OPf_WANT_VOID;
496
497 PUSHMARK(SP);
498 XPUSHs ((SV*)get_cv(SUB_INIT, TRUE));
499 /*
500 * the next line is slightly wrong, as PL_op->op_next
501 * is actually being executed so we skip the first op.
502 * that doesn't matter, though, since it is only
503 * pp_nextstate and we never return...
504 * ah yes, and I don't care anyways ;)
505 */
506 PUTBACK;
507 PL_op = pp_entersub(aTHX);
508 SPAGAIN;
509
510 ENTER; /* necessary e.g. for dounwind */
511 }
512 }
513} 1852}
514 1853
515MODULE = Coro::State PACKAGE = Coro::State 1854void
516 1855_set_current (SV *current)
517PROTOTYPES: ENABLE
518
519BOOT:
520{ /* {} necessary for stoopid perl-5.6.x */
521 HV * stash = gv_stashpvn("Coro::State", 10, TRUE);
522
523 newCONSTSUB (stash, "SAVE_DEFAV", newSViv (TRANSFER_SAVE_DEFAV));
524 newCONSTSUB (stash, "SAVE_DEFSV", newSViv (TRANSFER_SAVE_DEFSV));
525 newCONSTSUB (stash, "SAVE_ERRSV", newSViv (TRANSFER_SAVE_ERRSV));
526
527 if (!padlist_cache)
528 padlist_cache = newHV ();
529
530 main_mainstack = PL_mainstack;
531}
532
533Coro::State
534_newprocess(args)
535 SV * args
536 PROTOTYPE: $ 1856 PROTOTYPE: $
1857 CODE:
1858 SvREFCNT_dec (SvRV (coro_current));
1859 SvRV_set (coro_current, SvREFCNT_inc (SvRV (current)));
1860
1861int
1862prio (Coro::State coro, int newprio = 0)
1863 ALIAS:
1864 nice = 1
537 CODE: 1865 CODE:
538 Coro__State coro; 1866{
539
540 if (!SvROK (args) || SvTYPE (SvRV (args)) != SVt_PVAV)
541 croak ("Coro::State::_newprocess expects an arrayref");
542
543 New (0, coro, 1, struct coro);
544
545 coro->mainstack = 0; /* actual work is done inside transfer */
546 coro->args = (AV *)SvREFCNT_inc (SvRV (args));
547
548 RETVAL = coro; 1867 RETVAL = coro->prio;
549 OUTPUT: 1868
1869 if (items > 1)
1870 {
1871 if (ix)
1872 newprio = coro->prio - newprio;
1873
1874 if (newprio < PRIO_MIN) newprio = PRIO_MIN;
1875 if (newprio > PRIO_MAX) newprio = PRIO_MAX;
1876
1877 coro->prio = newprio;
1878 }
1879}
1880 OUTPUT:
550 RETVAL 1881 RETVAL
551 1882
1883SV *
1884ready (SV *self)
1885 PROTOTYPE: $
1886 CODE:
1887 RETVAL = boolSV (api_ready (self));
1888 OUTPUT:
1889 RETVAL
1890
1891int
1892nready (...)
1893 PROTOTYPE:
1894 CODE:
1895 RETVAL = coro_nready;
1896 OUTPUT:
1897 RETVAL
1898
552void 1899void
553transfer(prev, next, flags = TRANSFER_SAVE_ALL) 1900throw (Coro::State self, SV *throw = &PL_sv_undef)
554 Coro::State_or_hashref prev 1901 PROTOTYPE: $;$
555 Coro::State_or_hashref next
556 int flags
557 PROTOTYPE: @
558 CODE: 1902 CODE:
1903 SvREFCNT_dec (self->throw);
1904 self->throw = SvOK (throw) ? newSVsv (throw) : 0;
559 1905
560 transfer (aTHX_ prev, next, flags); 1906# for async_pool speedup
561
562void 1907void
563DESTROY(coro) 1908_pool_1 (SV *cb)
564 Coro::State coro 1909 CODE:
565 CODE: 1910{
1911 struct coro *coro = SvSTATE (coro_current);
1912 HV *hv = (HV *)SvRV (coro_current);
1913 AV *defav = GvAV (PL_defgv);
1914 SV *invoke = hv_delete (hv, "_invoke", sizeof ("_invoke") - 1, 0);
1915 AV *invoke_av;
1916 int i, len;
566 1917
567 if (coro->mainstack && coro->mainstack != main_mainstack) 1918 if (!invoke)
568 { 1919 {
569 struct coro temp; 1920 SvREFCNT_dec (PL_diehook); PL_diehook = 0;
570 1921 croak ("\3async_pool terminate\2\n");
571 SAVE(aTHX_ (&temp), TRANSFER_SAVE_ALL);
572 LOAD(aTHX_ coro);
573
574 destroy_stacks ();
575
576 LOAD((&temp)); /* this will get rid of defsv etc.. */
577 } 1922 }
578 1923
579 Safefree (coro); 1924 SvREFCNT_dec (coro->saved_deffh);
1925 coro->saved_deffh = SvREFCNT_inc ((SV *)PL_defoutgv);
580 1926
581 /* 1927 hv_store (hv, "desc", sizeof ("desc") - 1,
582 * there is one problematic case left (remember _recurse?) 1928 newSVpvn ("[async_pool]", sizeof ("[async_pool]") - 1), 0);
583 * consider the case when we 1929
1930 invoke_av = (AV *)SvRV (invoke);
1931 len = av_len (invoke_av);
1932
1933 sv_setsv (cb, AvARRAY (invoke_av)[0]);
1934
1935 if (len > 0)
584 * 1936 {
585 * 1. start a coroutine 1937 av_fill (defav, len - 1);
586 * 2. inside it descend into some xs functions 1938 for (i = 0; i < len; ++i)
587 * 3. xs function calls a callback 1939 av_store (defav, i, SvREFCNT_inc (AvARRAY (invoke_av)[i + 1]));
588 * 4. callback switches to $main
589 * 5. $main ends - we will end inside the xs function
590 * 6. xs function returns and perl executes - what?
591 * 1940 }
592 * to avoid this case we recurse in this function
593 * and simply call my_exit(0), skipping other xs functions
594 */
595 1941
596#if 0 1942 SvREFCNT_dec (invoke);
1943}
1944
597void 1945void
598_recurse() 1946_pool_2 (SV *cb)
599 CODE: 1947 CODE:
600 LEAVE; 1948{
601 PL_stack_sp = PL_stack_base + ax - 1; 1949 struct coro *coro = SvSTATE (coro_current);
602 PL_op = PL_op->op_next;
603 CALLRUNOPS(aTHX);
604 printf ("my_exit\n");
605 my_exit (0);
606 1950
607#endif 1951 sv_setsv (cb, &PL_sv_undef);
1952
1953 SvREFCNT_dec ((SV *)PL_defoutgv); PL_defoutgv = (GV *)coro->saved_deffh;
1954 coro->saved_deffh = 0;
1955
1956 if (coro_rss (aTHX_ coro) > SvIV (sv_pool_rss)
1957 || av_len (av_async_pool) + 1 >= SvIV (sv_pool_size))
1958 {
1959 SvREFCNT_dec (PL_diehook); PL_diehook = 0;
1960 croak ("\3async_pool terminate\2\n");
1961 }
1962
1963 av_clear (GvAV (PL_defgv));
1964 hv_store ((HV *)SvRV (coro_current), "desc", sizeof ("desc") - 1,
1965 newSVpvn ("[async_pool idle]", sizeof ("[async_pool idle]") - 1), 0);
1966
1967 coro->prio = 0;
1968
1969 if (coro->cctx && (coro->cctx->flags & CC_TRACE))
1970 api_trace (coro_current, 0);
1971
1972 av_push (av_async_pool, newSVsv (coro_current));
1973}
1974
1975
1976MODULE = Coro::State PACKAGE = Coro::AIO
1977
1978SV *
1979_get_state ()
1980 CODE:
1981{
1982 struct io_state *data;
1983
1984 RETVAL = newSV (sizeof (struct io_state));
1985 data = (struct io_state *)SvPVX (RETVAL);
1986 SvCUR_set (RETVAL, sizeof (struct io_state));
1987 SvPOK_only (RETVAL);
1988
1989 data->errorno = errno;
1990 data->laststype = PL_laststype;
1991 data->laststatval = PL_laststatval;
1992 data->statcache = PL_statcache;
1993}
1994 OUTPUT:
1995 RETVAL
608 1996
609void 1997void
610flush() 1998_set_state (char *data_)
1999 PROTOTYPE: $
611 CODE: 2000 CODE:
612#ifdef MAY_FLUSH 2001{
613 flush_padlist_cache (); 2002 struct io_state *data = (void *)data_;
614#endif
615 2003
616MODULE = Coro::State PACKAGE = Coro::Cont 2004 errno = data->errorno;
2005 PL_laststype = data->laststype;
2006 PL_laststatval = data->laststatval;
2007 PL_statcache = data->statcache;
2008}
617 2009
618# this is dirty (do you hear me?) and should be in it's own .xs
619
620void
621result(...)
622 PROTOTYPE: @
623 CODE:
624 static SV *returnstk;
625 SV *sv;
626 AV *defav = GvAV (PL_defgv);
627 struct coro *prev, *next;
628
629 if (!returnstk)
630 returnstk = SvRV (get_sv ("Coro::Cont::return", FALSE));
631
632 /* set up @_ -- ugly */
633 av_clear (defav);
634 av_fill (defav, items - 1);
635 while (items--)
636 av_store (defav, items, SvREFCNT_inc (ST(items)));
637
638 mg_get (returnstk); /* isn't documentation wrong for mg_get? */
639 sv = av_pop ((AV *)SvRV (returnstk));
640 prev = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 0, 0)));
641 next = (struct coro *)SvIV ((SV*)SvRV (*av_fetch ((AV *)SvRV (sv), 1, 0)));
642 SvREFCNT_dec (sv);
643 transfer(prev, next, 0);
644

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