1 |
#include "EXTERN.h" |
2 |
#include "perl.h" |
3 |
#include "XSUB.h" |
4 |
|
5 |
#include "schmorp.h" |
6 |
|
7 |
typedef volatile sig_atomic_t atomic_t; |
8 |
|
9 |
static int *sig_pending, *psig_pend; /* make local copies because of missing THX */ |
10 |
static Sighandler_t old_sighandler; |
11 |
static atomic_t async_pending; |
12 |
|
13 |
#define PERL_VERSION_ATLEAST(a,b,c) \ |
14 |
(PERL_REVISION > (a) \ |
15 |
|| (PERL_REVISION == (a) \ |
16 |
&& (PERL_VERSION > (b) \ |
17 |
|| (PERL_VERSION == (b) && PERL_SUBVERSION >= (c))))) |
18 |
|
19 |
#if defined(HAS_SIGACTION) && defined(SA_SIGINFO) |
20 |
# define HAS_SA_SIGINFO 1 |
21 |
#endif |
22 |
|
23 |
#if !PERL_VERSION_ATLEAST(5,10,0) |
24 |
# undef HAS_SA_SIGINFO |
25 |
#endif |
26 |
|
27 |
/*****************************************************************************/ |
28 |
|
29 |
typedef struct { |
30 |
SV *cb; |
31 |
void (*c_cb)(pTHX_ void *c_arg, int value); |
32 |
void *c_arg; |
33 |
SV *fh_r, *fh_w; |
34 |
SV *value; |
35 |
int signum; |
36 |
int autodrain; |
37 |
ANY *scope_savestack; |
38 |
volatile int blocked; |
39 |
|
40 |
s_epipe ep; |
41 |
int fd_wlen; |
42 |
atomic_t fd_enable; |
43 |
atomic_t pending; |
44 |
volatile IV *valuep; |
45 |
atomic_t hysteresis; |
46 |
} async_t; |
47 |
|
48 |
static AV *asyncs; |
49 |
static async_t *sig_async [SIG_SIZE]; |
50 |
|
51 |
#define SvASYNC_nrv(sv) INT2PTR (async_t *, SvIVX (sv)) |
52 |
#define SvASYNC(rv) SvASYNC_nrv (SvRV (rv)) |
53 |
|
54 |
static void async_signal (void *signal_arg, int value); |
55 |
|
56 |
static void |
57 |
setsig (int signum, void (*handler)(int)) |
58 |
{ |
59 |
#if _WIN32 |
60 |
signal (async->signum, handler); |
61 |
#else |
62 |
struct sigaction sa; |
63 |
sa.sa_handler = handler; |
64 |
sigfillset (&sa.sa_mask); |
65 |
sa.sa_flags = 0; /* if we interrupt a syscall, we might drain the pipe before it became ready */ |
66 |
sigaction (signum, &sa, 0); |
67 |
} |
68 |
|
69 |
static void |
70 |
async_sigsend (int signum) |
71 |
{ |
72 |
async_signal (sig_async [signum], 0); |
73 |
} |
74 |
|
75 |
/* the main workhorse to signal */ |
76 |
static void |
77 |
async_signal (void *signal_arg, int value) |
78 |
{ |
79 |
static char pipedata [8]; |
80 |
|
81 |
async_t *async = (async_t *)signal_arg; |
82 |
int pending = async->pending; |
83 |
|
84 |
if (async->hysteresis) |
85 |
setsig (async->signum, SIG_IGN); |
86 |
|
87 |
*async->valuep = value ? value : 1; |
88 |
async->pending = 1; |
89 |
async_pending = 1; |
90 |
psig_pend [9] = 1; |
91 |
*sig_pending = 1; |
92 |
|
93 |
if (!pending && async->fd_enable && async->ep.len) |
94 |
s_epipe_signal (&async->ep); |
95 |
} |
96 |
|
97 |
static void |
98 |
handle_async (async_t *async) |
99 |
{ |
100 |
int old_errno = errno; |
101 |
int value = *async->valuep; |
102 |
|
103 |
*async->valuep = 0; |
104 |
async->pending = 0; |
105 |
|
106 |
/* restore signal */ |
107 |
if (async->hysteresis) |
108 |
setsig (async->signum, async_sigsend); |
109 |
|
110 |
/* drain pipe */ |
111 |
if (async->fd_enable && async->ep.len && async->autodrain) |
112 |
s_epipe_drain (&async->ep); |
113 |
|
114 |
if (async->c_cb) |
115 |
{ |
116 |
dTHX; |
117 |
async->c_cb (aTHX_ async->c_arg, value); |
118 |
} |
119 |
|
120 |
if (async->cb) |
121 |
{ |
122 |
dSP; |
123 |
|
124 |
SV *saveerr = SvOK (ERRSV) ? sv_mortalcopy (ERRSV) : 0; |
125 |
SV *savedie = PL_diehook; |
126 |
|
127 |
PL_diehook = 0; |
128 |
|
129 |
PUSHSTACKi (PERLSI_SIGNAL); |
130 |
|
131 |
PUSHMARK (SP); |
132 |
XPUSHs (sv_2mortal (newSViv (value))); |
133 |
PUTBACK; |
134 |
call_sv (async->cb, G_VOID | G_DISCARD | G_EVAL); |
135 |
|
136 |
if (SvTRUE (ERRSV)) |
137 |
{ |
138 |
SPAGAIN; |
139 |
|
140 |
PUSHMARK (SP); |
141 |
PUTBACK; |
142 |
call_sv (get_sv ("Async::Interrupt::DIED", 1), G_VOID | G_DISCARD | G_EVAL | G_KEEPERR); |
143 |
|
144 |
sv_setpvn (ERRSV, "", 0); |
145 |
} |
146 |
|
147 |
if (saveerr) |
148 |
sv_setsv (ERRSV, saveerr); |
149 |
|
150 |
{ |
151 |
SV *oldhook = PL_diehook; |
152 |
PL_diehook = savedie; |
153 |
SvREFCNT_dec (oldhook); |
154 |
} |
155 |
|
156 |
POPSTACK; |
157 |
} |
158 |
|
159 |
errno = old_errno; |
160 |
} |
161 |
|
162 |
static void |
163 |
handle_asyncs (void) |
164 |
{ |
165 |
int i; |
166 |
|
167 |
async_pending = 0; |
168 |
|
169 |
for (i = AvFILLp (asyncs); i >= 0; --i) |
170 |
{ |
171 |
SV *async_sv = AvARRAY (asyncs)[i]; |
172 |
async_t *async = SvASYNC_nrv (async_sv); |
173 |
|
174 |
if (async->pending && !async->blocked) |
175 |
{ |
176 |
/* temporarily keep a refcount */ |
177 |
SvREFCNT_inc (async_sv); |
178 |
handle_async (async); |
179 |
SvREFCNT_dec (async_sv); |
180 |
|
181 |
/* the handler could have deleted any number of asyncs */ |
182 |
if (i > AvFILLp (asyncs)) |
183 |
i = AvFILLp (asyncs); |
184 |
} |
185 |
} |
186 |
} |
187 |
|
188 |
#if HAS_SA_SIGINFO |
189 |
static Signal_t async_sighandler (int signum, siginfo_t *si, void *sarg) |
190 |
{ |
191 |
if (signum == 9) |
192 |
handle_asyncs (); |
193 |
else |
194 |
old_sighandler (signum, si, sarg); |
195 |
} |
196 |
#else |
197 |
static Signal_t async_sighandler (int signum) |
198 |
{ |
199 |
if (signum == 9) |
200 |
handle_asyncs (); |
201 |
else |
202 |
old_sighandler (signum); |
203 |
} |
204 |
#endif |
205 |
|
206 |
#define block(async) ++(async)->blocked |
207 |
|
208 |
static void |
209 |
unblock (async_t *async) |
210 |
{ |
211 |
--async->blocked; |
212 |
if (async->pending && !async->blocked) |
213 |
handle_async (async); |
214 |
} |
215 |
|
216 |
static void |
217 |
scope_block_cb (pTHX_ void *async_sv) |
218 |
{ |
219 |
async_t *async = SvASYNC_nrv ((SV *)async_sv); |
220 |
|
221 |
async->scope_savestack = 0; |
222 |
unblock (async); |
223 |
SvREFCNT_dec (async_sv); |
224 |
} |
225 |
|
226 |
static void |
227 |
scope_block (SV *async_sv) |
228 |
{ |
229 |
async_t *async = SvASYNC_nrv (async_sv); |
230 |
|
231 |
/* as a heuristic, we skip the scope block if we already are blocked */ |
232 |
/* and the existing scope block used the same savestack */ |
233 |
|
234 |
if (!async->scope_savestack || async->scope_savestack != PL_savestack) |
235 |
{ |
236 |
async->scope_savestack = PL_savestack; |
237 |
block (async); |
238 |
|
239 |
LEAVE; /* unfortunately, perl sandwiches XS calls into ENTER/LEAVE */ |
240 |
SAVEDESTRUCTOR_X (scope_block_cb, (void *)SvREFCNT_inc (async_sv)); |
241 |
ENTER; /* unfortunately, perl sandwiches XS calls into ENTER/LEAVE */ |
242 |
} |
243 |
} |
244 |
|
245 |
#endif |
246 |
MODULE = Async::Interrupt PACKAGE = Async::Interrupt |
247 |
|
248 |
BOOT: |
249 |
old_sighandler = PL_sighandlerp; |
250 |
PL_sighandlerp = async_sighandler; |
251 |
sig_pending = &PL_sig_pending; |
252 |
psig_pend = PL_psig_pend; |
253 |
asyncs = newAV (); |
254 |
CvNODEBUG_on (get_cv ("Async::Interrupt::scope_block", 0)); /* otherwise calling scope can be the debugger */ |
255 |
|
256 |
PROTOTYPES: DISABLE |
257 |
|
258 |
void |
259 |
_alloc (SV *cb, void *c_cb, void *c_arg, SV *fh_r, SV *fh_w, SV *signl, SV *pvalue) |
260 |
PPCODE: |
261 |
{ |
262 |
SV *cv = SvOK (cb) ? SvREFCNT_inc (s_get_cv_croak (cb)) : 0; |
263 |
async_t *async; |
264 |
|
265 |
Newz (0, async, 1, async_t); |
266 |
|
267 |
XPUSHs (sv_2mortal (newSViv (PTR2IV (async)))); |
268 |
/* TODO: need to bless right now to ensure deallocation */ |
269 |
av_push (asyncs, TOPs); |
270 |
|
271 |
SvGETMAGIC (fh_r); SvGETMAGIC (fh_w); |
272 |
if (SvOK (fh_r) || SvOK (fh_w)) |
273 |
{ |
274 |
int fd_r = s_fileno_croak (fh_r, 0); |
275 |
int fd_w = s_fileno_croak (fh_w, 1); |
276 |
|
277 |
async->fh_r = newSVsv (fh_r); |
278 |
async->fh_w = newSVsv (fh_w); |
279 |
async->ep.fd [0] = fd_r; |
280 |
async->ep.fd [1] = fd_w; |
281 |
async->ep.len = 1; |
282 |
async->fd_enable = 1; |
283 |
} |
284 |
|
285 |
async->value = SvROK (pvalue) |
286 |
? SvREFCNT_inc_NN (SvRV (pvalue)) |
287 |
: NEWSV (0, 0); |
288 |
|
289 |
sv_setiv (async->value, 0); |
290 |
SvIOK_only (async->value); /* just to be sure */ |
291 |
SvREADONLY_on (async->value); |
292 |
|
293 |
async->valuep = &(SvIVX (async->value)); |
294 |
|
295 |
async->autodrain = 1; |
296 |
async->cb = cv; |
297 |
async->c_cb = c_cb; |
298 |
async->c_arg = c_arg; |
299 |
async->signum = SvOK (signl) ? s_signum_croak (signl) : 0; |
300 |
|
301 |
if (async->signum) |
302 |
{ |
303 |
if (async->signum < 0) |
304 |
croak ("Async::Interrupt::new got passed illegal signal name or number: %s", SvPV_nolen (signl)); |
305 |
|
306 |
sig_async [async->signum] = async; |
307 |
setsig (async->signum, async_sigsend); |
308 |
} |
309 |
} |
310 |
|
311 |
void |
312 |
signal_hysteresis (async_t *async, int enable) |
313 |
CODE: |
314 |
async->hysteresis = enable; |
315 |
|
316 |
void |
317 |
signal_func (async_t *async) |
318 |
PPCODE: |
319 |
EXTEND (SP, 2); |
320 |
PUSHs (sv_2mortal (newSViv (PTR2IV (async_signal)))); |
321 |
PUSHs (sv_2mortal (newSViv (PTR2IV (async)))); |
322 |
|
323 |
void |
324 |
scope_block_func (SV *self) |
325 |
PPCODE: |
326 |
EXTEND (SP, 2); |
327 |
PUSHs (sv_2mortal (newSViv (PTR2IV (scope_block)))); |
328 |
PUSHs (sv_2mortal (newSViv (PTR2IV (SvRV (self))))); |
329 |
|
330 |
IV |
331 |
c_var (async_t *async) |
332 |
CODE: |
333 |
RETVAL = PTR2IV (async->valuep); |
334 |
OUTPUT: |
335 |
RETVAL |
336 |
|
337 |
void |
338 |
signal (async_t *async, int value = 1) |
339 |
CODE: |
340 |
async_signal (async, value); |
341 |
|
342 |
void |
343 |
block (async_t *async) |
344 |
CODE: |
345 |
block (async); |
346 |
|
347 |
void |
348 |
unblock (async_t *async) |
349 |
CODE: |
350 |
unblock (async); |
351 |
|
352 |
void |
353 |
scope_block (SV *self) |
354 |
CODE: |
355 |
scope_block (SvRV (self)); |
356 |
|
357 |
void |
358 |
pipe_enable (async_t *async) |
359 |
ALIAS: |
360 |
pipe_enable = 1 |
361 |
pipe_disable = 0 |
362 |
CODE: |
363 |
async->fd_enable = ix; |
364 |
|
365 |
int |
366 |
pipe_fileno (async_t *async) |
367 |
CODE: |
368 |
if (!async->ep.len) |
369 |
{ |
370 |
int res; |
371 |
|
372 |
/*block (async);*//*TODO*/ |
373 |
res = s_epipe_new (&async->ep); |
374 |
async->fd_enable = 1; |
375 |
/*unblock (async);*//*TODO*/ |
376 |
|
377 |
if (res < 0) |
378 |
croak ("Async::Interrupt: unable to initialize event pipe"); |
379 |
} |
380 |
|
381 |
RETVAL = async->ep.fd [0]; |
382 |
OUTPUT: |
383 |
RETVAL |
384 |
|
385 |
int |
386 |
pipe_autodrain (async_t *async, int enable = -1) |
387 |
CODE: |
388 |
RETVAL = async->autodrain; |
389 |
if (enable >= 0) |
390 |
async->autodrain = enable; |
391 |
OUTPUT: |
392 |
RETVAL |
393 |
|
394 |
void |
395 |
post_fork (async_t *async) |
396 |
CODE: |
397 |
if (async->ep.len) |
398 |
{ |
399 |
int res; |
400 |
|
401 |
/*block (async);*//*TODO*/ |
402 |
res = s_epipe_renew (&async->ep); |
403 |
/*unblock (async);*//*TODO*/ |
404 |
|
405 |
if (res < 0) |
406 |
croak ("Async::Interrupt: unable to initialize event pipe after fork"); |
407 |
} |
408 |
|
409 |
void |
410 |
DESTROY (SV *self) |
411 |
CODE: |
412 |
{ |
413 |
int i; |
414 |
SV *async_sv = SvRV (self); |
415 |
async_t *async = SvASYNC_nrv (async_sv); |
416 |
|
417 |
for (i = AvFILLp (asyncs); i >= 0; --i) |
418 |
if (AvARRAY (asyncs)[i] == async_sv) |
419 |
{ |
420 |
AvARRAY (asyncs)[i] = AvARRAY (asyncs)[AvFILLp (asyncs)]; |
421 |
av_pop (asyncs); |
422 |
goto found; |
423 |
} |
424 |
|
425 |
if (!PL_dirty) |
426 |
warn ("Async::Interrupt::DESTROY could not find async object in list of asyncs, please report"); |
427 |
|
428 |
found: |
429 |
|
430 |
if (async->signum) |
431 |
setsig (async->signum, SIG_DFL); |
432 |
|
433 |
if (!async->fh_r && async->ep.len) |
434 |
s_epipe_destroy (&async->ep); |
435 |
|
436 |
SvREFCNT_dec (async->fh_r); |
437 |
SvREFCNT_dec (async->fh_w); |
438 |
SvREFCNT_dec (async->cb); |
439 |
SvREFCNT_dec (async->value); |
440 |
|
441 |
Safefree (async); |
442 |
} |
443 |
|
444 |
SV * |
445 |
sig2num (SV *signame_or_number) |
446 |
ALIAS: |
447 |
sig2num = 0 |
448 |
sig2name = 1 |
449 |
CODE: |
450 |
{ |
451 |
int signum = s_signum (signame_or_number); |
452 |
|
453 |
if (signum < 0) |
454 |
RETVAL = &PL_sv_undef; |
455 |
else if (ix) |
456 |
RETVAL = newSVpv (PL_sig_name [signum], 0); |
457 |
else |
458 |
RETVAL = newSViv (signum); |
459 |
} |
460 |
OUTPUT: |
461 |
RETVAL |
462 |
|
463 |
MODULE = Async::Interrupt PACKAGE = Async::Interrupt::EventPipe PREFIX = s_epipe_ |
464 |
|
465 |
void |
466 |
new (const char *klass) |
467 |
PPCODE: |
468 |
{ |
469 |
s_epipe *epp; |
470 |
SV *self; |
471 |
|
472 |
Newz (0, epp, 1, s_epipe); |
473 |
XPUSHs (sv_setref_iv (sv_newmortal (), klass, PTR2IV (epp))); |
474 |
|
475 |
if (s_epipe_new (epp) < 0) |
476 |
croak ("Async::Interrupt::EventPipe: unable to create new event pipe"); |
477 |
} |
478 |
|
479 |
void |
480 |
filenos (s_epipe *epp) |
481 |
PPCODE: |
482 |
EXTEND (SP, 2); |
483 |
PUSHs (sv_2mortal (newSViv (epp->fd [0]))); |
484 |
PUSHs (sv_2mortal (newSViv (epp->fd [1]))); |
485 |
|
486 |
int |
487 |
fileno (s_epipe *epp) |
488 |
ALIAS: |
489 |
fileno = 0 |
490 |
fileno_r = 0 |
491 |
fileno_w = 1 |
492 |
CODE: |
493 |
RETVAL = epp->fd [ix]; |
494 |
OUTPUT: |
495 |
RETVAL |
496 |
|
497 |
int |
498 |
type (s_epipe *epp) |
499 |
CODE: |
500 |
RETVAL = epp->len; |
501 |
OUTPUT: |
502 |
RETVAL |
503 |
|
504 |
void |
505 |
s_epipe_signal (s_epipe *epp) |
506 |
|
507 |
void |
508 |
s_epipe_drain (s_epipe *epp) |
509 |
|
510 |
void |
511 |
drain_func (s_epipe *epp) |
512 |
PPCODE: |
513 |
EXTEND (SP, 2); |
514 |
PUSHs (sv_2mortal (newSViv (PTR2IV (s_epipe_drain)))); |
515 |
PUSHs (sv_2mortal (newSViv (PTR2IV (epp)))); |
516 |
|
517 |
void |
518 |
s_epipe_wait (s_epipe *epp) |
519 |
|
520 |
void |
521 |
DESTROY (s_epipe *epp) |
522 |
CODE: |
523 |
s_epipe_destroy (epp); |
524 |
|