ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libcoro/coro.c
(Generate patch)

Comparing libcoro/coro.c (file contents):
Revision 1.20 by root, Thu Oct 26 05:20:47 2006 UTC vs.
Revision 1.49 by root, Fri Apr 2 19:04:04 2010 UTC

1/* 1/*
2 * Copyright (c) 2001-2006 Marc Alexander Lehmann <schmorp@schmorp.de> 2 * Copyright (c) 2001-2009 Marc Alexander Lehmann <schmorp@schmorp.de>
3 * 3 *
4 * Redistribution and use in source and binary forms, with or without modifica- 4 * Redistribution and use in source and binary forms, with or without modifica-
5 * tion, are permitted provided that the following conditions are met: 5 * tion, are permitted provided that the following conditions are met:
6 * 6 *
7 * 1. Redistributions of source code must retain the above copyright notice, 7 * 1. Redistributions of source code must retain the above copyright notice,
8 * this list of conditions and the following disclaimer. 8 * this list of conditions and the following disclaimer.
9 * 9 *
10 * 2. Redistributions in binary form must reproduce the above copyright 10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the 11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution. 12 * documentation and/or other materials provided with the distribution.
13 *
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 * 13 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- 15 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER-
19 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 16 * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
20 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- 17 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE-
… …
23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- 21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH-
25 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 22 * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
26 * OF THE POSSIBILITY OF SUCH DAMAGE. 23 * OF THE POSSIBILITY OF SUCH DAMAGE.
27 * 24 *
25 * Alternatively, the contents of this file may be used under the terms of
26 * the GNU General Public License ("GPL") version 2 or any later version,
27 * in which case the provisions of the GPL are applicable instead of
28 * the above. If you wish to allow the use of your version of this file
29 * only under the terms of the GPL and not to allow others to use your
30 * version of this file under the BSD license, indicate your decision
31 * by deleting the provisions above and replace them with the notice
32 * and other provisions required by the GPL. If you do not delete the
33 * provisions above, a recipient may use your version of this file under
34 * either the BSD or the GPL.
35 *
28 * This library is modelled strictly after Ralf S. Engelschalls article at 36 * This library is modelled strictly after Ralf S. Engelschalls article at
29 * http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must 37 * http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must
30 * go to Ralf S. Engelschall <rse@engelschall.com>. 38 * go to Ralf S. Engelschall <rse@engelschall.com>.
31 */ 39 */
32 40
33#include "coro.h" 41#include "coro.h"
34 42
43#include <string.h>
44
45/*****************************************************************************/
46/* ucontext/setjmp/asm backends */
47/*****************************************************************************/
48#if CORO_UCONTEXT || CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
49
50# if CORO_UCONTEXT
51# include <stddef.h>
52# endif
53
35#if !defined(STACK_ADJUST_PTR) 54# if !defined(STACK_ADJUST_PTR)
55# if __sgi
36/* IRIX is decidedly NON-unix */ 56/* IRIX is decidedly NON-unix */
37# if __sgi
38# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) 57# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
39# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8) 58# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8)
40# elif __i386__ && CORO_LINUX 59# elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER)
41# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss)) 60# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss))
42# define STACK_ADJUST_SIZE(sp,ss) (ss) 61# define STACK_ADJUST_SIZE(sp,ss) (ss)
43# elif __amd64__ && CORO_LINUX 62# elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER)
44# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) 63# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
45# define STACK_ADJUST_SIZE(sp,ss) (ss) 64# define STACK_ADJUST_SIZE(sp,ss) (ss)
46# else 65# else
47# define STACK_ADJUST_PTR(sp,ss) (sp) 66# define STACK_ADJUST_PTR(sp,ss) (sp)
48# define STACK_ADJUST_SIZE(sp,ss) (ss) 67# define STACK_ADJUST_SIZE(sp,ss) (ss)
49# endif 68# endif
50#endif 69# endif
51 70
52#if CORO_UCONTEXT
53# include <stddef.h>
54#endif
55
56#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX
57
58#include <stdlib.h> 71# include <stdlib.h>
59 72
60#if CORO_SJLJ 73# if CORO_SJLJ
61# include <stdio.h> 74# include <stdio.h>
62# include <signal.h> 75# include <signal.h>
63# include <unistd.h> 76# include <unistd.h>
64#endif 77# endif
65 78
66static volatile coro_func coro_init_func; 79static coro_func coro_init_func;
67static volatile void *coro_init_arg; 80static void *coro_init_arg;
68static volatile coro_context *new_coro, *create_coro; 81static coro_context *new_coro, *create_coro;
69 82
70static void 83static void
71coro_init (void) 84coro_init (void)
72{ 85{
73 volatile coro_func func = coro_init_func; 86 volatile coro_func func = coro_init_func;
74 volatile void *arg = coro_init_arg; 87 volatile void *arg = coro_init_arg;
75 88
76 coro_transfer ((coro_context *)new_coro, (coro_context *)create_coro); 89 coro_transfer (new_coro, create_coro);
77 90
78 func ((void *)arg); 91 func ((void *)arg);
79 92
80 /* the new coro returned. bad. just abort() for now */ 93 /* the new coro returned. bad. just abort() for now */
81 abort (); 94 abort ();
82} 95}
83 96
84# if CORO_SJLJ 97# if CORO_SJLJ
85 98
86static volatile int trampoline_count; 99static volatile int trampoline_done;
87 100
88/* trampoline signal handler */ 101/* trampoline signal handler */
89static void 102static void
90trampoline (int sig) 103trampoline (int sig)
91{ 104{
92 if (setjmp (((coro_context *)new_coro)->env)) 105 if (coro_setjmp (new_coro->env))
93 coro_init (); /* start it */ 106 coro_init (); /* start it */
94 else 107 else
95 trampoline_count++; 108 trampoline_done = 1;
96} 109}
97 110
98# endif
99
100#endif 111# endif
101 112
102/* initialize a machine state */ 113# if CORO_ASM
103void coro_create(coro_context *ctx,
104 coro_func coro, void *arg,
105 void *sptr, long ssize)
106{
107#if CORO_UCONTEXT
108 114
109 getcontext (&(ctx->uc)); 115 asm (
116 ".text\n"
117 ".globl coro_transfer\n"
118 ".type coro_transfer, @function\n"
119 "coro_transfer:\n"
120 #if __amd64
121 #if CORO_WIN_TIB
122 #define NUM_SAVED 6+3
123 "\tpush %fs:0x0\n"
124 "\tpush %fs:0x8\n"
125 "\tpush %fs:0xc\n"
126 #else
127 #define NUM_SAVED 6
128 #endif
129 "\tpush %rbp\n"
130 "\tpush %rbx\n"
131 "\tpush %r12\n"
132 "\tpush %r13\n"
133 "\tpush %r14\n"
134 "\tpush %r15\n"
135 "\tmov %rsp, (%rdi)\n"
136 "\tmov (%rsi), %rsp\n"
137 "\tpop %r15\n"
138 "\tpop %r14\n"
139 "\tpop %r13\n"
140 "\tpop %r12\n"
141 "\tpop %rbx\n"
142 "\tpop %rbp\n"
143 #if CORO_WIN_TIB
144 "\tpop %fs:0xc\n"
145 "\tpop %fs:0x8\n"
146 "\tpop %fs:0x0\n"
147 #endif
148 #elif __i386
149 #if CORO_WIN_TIB
150 #define NUM_SAVED 4+3
151 "\tpush %fs:0x0\n"
152 "\tpush %fs:0x4\n"
153 "\tpush %fs:0x8\n"
154 #else
155 #define NUM_SAVED 4
156 #endif
157 "\tpush %ebp\n"
158 "\tpush %ebx\n"
159 "\tpush %esi\n"
160 "\tpush %edi\n"
161 "\tmov %esp, (%eax)\n"
162 "\tmov (%edx), %esp\n"
163 "\tpop %edi\n"
164 "\tpop %esi\n"
165 "\tpop %ebx\n"
166 "\tpop %ebp\n"
167 #if CORO_WIN_TIB
168 "\tpop %fs:0x8\n"
169 "\tpop %fs:0x4\n"
170 "\tpop %fs:0x0\n"
171 #endif
172 #else
173 #error unsupported architecture
174 #endif
175 "\tret\n"
176 );
110 177
111 ctx->uc.uc_link = 0; 178# endif
112 ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize);
113 ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize);
114 ctx->uc.uc_stack.ss_flags = 0;
115 179
116 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 180void
117 181coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
118#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX 182{
119 183 coro_context nctx;
120# if CORO_SJLJ 184# if CORO_SJLJ
121 stack_t ostk, nstk; 185 stack_t ostk, nstk;
122 struct sigaction osa, nsa; 186 struct sigaction osa, nsa;
123 sigset_t nsig, osig; 187 sigset_t nsig, osig;
124# endif 188# endif
125 coro_context nctx; 189
190 if (!coro)
191 return;
126 192
127 coro_init_func = coro; 193 coro_init_func = coro;
128 coro_init_arg = arg; 194 coro_init_arg = arg;
129 195
130 new_coro = ctx; 196 new_coro = ctx;
… …
140 nsa.sa_handler = trampoline; 206 nsa.sa_handler = trampoline;
141 sigemptyset (&nsa.sa_mask); 207 sigemptyset (&nsa.sa_mask);
142 nsa.sa_flags = SA_ONSTACK; 208 nsa.sa_flags = SA_ONSTACK;
143 209
144 if (sigaction (SIGUSR2, &nsa, &osa)) 210 if (sigaction (SIGUSR2, &nsa, &osa))
211 {
145 perror ("sigaction"); 212 perror ("sigaction");
213 abort ();
214 }
146 215
147 /* set the new stack */ 216 /* set the new stack */
148 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */ 217 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
149 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize); 218 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
150 nstk.ss_flags = 0; 219 nstk.ss_flags = 0;
151 220
152 if (sigaltstack (&nstk, &ostk) < 0) 221 if (sigaltstack (&nstk, &ostk) < 0)
222 {
153 perror ("sigaltstack"); 223 perror ("sigaltstack");
224 abort ();
225 }
154 226
155 trampoline_count = 0; 227 trampoline_done = 0;
156 kill (getpid (), SIGUSR2); 228 kill (getpid (), SIGUSR2);
157 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 229 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
158 230
159 while (!trampoline_count) 231 while (!trampoline_done)
160 sigsuspend (&nsig); 232 sigsuspend (&nsig);
161 233
162 sigaltstack (0, &nstk); 234 sigaltstack (0, &nstk);
163 nstk.ss_flags = SS_DISABLE; 235 nstk.ss_flags = SS_DISABLE;
164 if (sigaltstack (&nstk, 0) < 0) 236 if (sigaltstack (&nstk, 0) < 0)
… …
170 242
171 if (~ostk.ss_flags & SS_DISABLE) 243 if (~ostk.ss_flags & SS_DISABLE)
172 sigaltstack (&ostk, 0); 244 sigaltstack (&ostk, 0);
173 245
174 sigaction (SIGUSR2, &osa, 0); 246 sigaction (SIGUSR2, &osa, 0);
175
176 sigprocmask (SIG_SETMASK, &osig, 0); 247 sigprocmask (SIG_SETMASK, &osig, 0);
177 248
178# elif CORO_LOSER 249# elif CORO_LOSER
179 250
180 setjmp (ctx->env); 251 coro_setjmp (ctx->env);
181 ctx->env[7] = (long)((char *)sptr + ssize); 252 #if __CYGWIN__ && __i386
182 ctx->env[8] = (long)coro_init; 253 ctx->env[8] = (long) coro_init;
254 ctx->env[7] = (long) ((char *)sptr + ssize) - sizeof (long);
255 #elif __CYGWIN__ && __x86_64
256 ctx->env[7] = (long) coro_init;
257 ctx->env[6] = (long) ((char *)sptr + ssize) - sizeof (long);
258 #elif defined(__MINGW32__)
259 ctx->env[5] = (long) coro_init;
260 ctx->env[4] = (long) ((char *)sptr + ssize) - sizeof (long);
261 #elif defined(_M_IX86)
262 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long) coro_init;
263 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
264 #elif defined(_M_AMD64)
265 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64) coro_init;
266 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64);
267 #elif defined(_M_IA64)
268 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64) coro_init;
269 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64);
270 #else
271 #error "microsoft libc or architecture not supported"
272 #endif
183 273
184# elif CORO_LINUX 274# elif CORO_LINUX
185 275
186 setjmp (ctx->env); 276 coro_setjmp (ctx->env);
187#if defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
188 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(JB_PC) && defined(JB_SP) 277 #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
189 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; 278 ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init;
190 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr,ssize); 279 ctx->env[0].__jmpbuf[JB_SP] = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
191#elif defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
192 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(__mc68000__) 280 #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
193 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; 281 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
194 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); 282 ctx->env[0].__jmpbuf[0].__sp = (int *) ((char *)sptr + ssize) - sizeof (long);
195#elif defined(__GNU_LIBRARY__) && defined(__i386__) 283 #elif defined (__GNU_LIBRARY__) && defined (__i386__)
196 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; 284 ctx->env[0].__jmpbuf[0].__pc = (char *) coro_init;
197 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); 285 ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long);
198#elif defined(__GNU_LIBRARY__) && defined(__amd64__) 286 #elif defined (__GNU_LIBRARY__) && defined (__amd64__)
199 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; 287 ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init;
200 ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr,ssize); 288 ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long);
289 #else
290 #error "linux libc or architecture not supported"
291 #endif
292
293# elif CORO_IRIX
294
295 coro_setjmp (ctx->env, 0);
296 ctx->env[JB_PC] = (__uint64_t)coro_init;
297 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
298
299# elif CORO_ASM
300
301 ctx->sp = (void **)(ssize + (char *)sptr);
302 *--ctx->sp = (void *)abort; /* needed for alignment only */
303 *--ctx->sp = (void *)coro_init;
304 ctx->sp -= NUM_SAVED;
305
306# elif CORO_UCONTEXT
307
308 getcontext (&(ctx->uc));
309
310 ctx->uc.uc_link = 0;
311 ctx->uc.uc_stack.ss_sp = sptr;
312 ctx->uc.uc_stack.ss_size = (size_t)ssize;
313 ctx->uc.uc_stack.ss_flags = 0;
314
315 makecontext (&(ctx->uc), (void (*)())coro_init, 0);
316
317# endif
318
319 coro_transfer (create_coro, new_coro);
320}
321
322/*****************************************************************************/
323/* pthread backend */
324/*****************************************************************************/
325#elif CORO_PTHREAD
326
327/* this mutex will be locked by the running coroutine */
328pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
329
330struct coro_init_args
331{
332 coro_func func;
333 void *arg;
334 coro_context *self, *main;
335};
336
337static pthread_t null_tid;
338
339/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */
340static void
341mutex_unlock_wrapper (void *arg)
342{
343 pthread_mutex_unlock ((pthread_mutex_t *)arg);
344}
345
346static void *
347coro_init (void *args_)
348{
349 struct coro_init_args *args = (struct coro_init_args *)args_;
350 coro_func func = args->func;
351 void *arg = args->arg;
352
353 pthread_mutex_lock (&coro_mutex);
354
355 /* we try to be good citizens and use deferred cancellation and cleanup handlers */
356 pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex);
357 coro_transfer (args->self, args->main);
358 func (arg);
359 pthread_cleanup_pop (1);
360
361 return 0;
362}
363
364void
365coro_transfer (coro_context *prev, coro_context *next)
366{
367 pthread_cond_signal (&next->cv);
368 pthread_cond_wait (&prev->cv, &coro_mutex);
369#if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */
370 pthread_testcancel ();
371#endif
372}
373
374void
375coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
376{
377 static coro_context nctx;
378 static int once;
379
380 if (!once)
381 {
382 once = 1;
383
384 pthread_mutex_lock (&coro_mutex);
385 pthread_cond_init (&nctx.cv, 0);
386 null_tid = pthread_self ();
387 }
388
389 pthread_cond_init (&ctx->cv, 0);
390
391 if (coro)
392 {
393 pthread_attr_t attr;
394 struct coro_init_args args;
395
396 args.func = coro;
397 args.arg = arg;
398 args.self = ctx;
399 args.main = &nctx;
400
401 pthread_attr_init (&attr);
402 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
403 pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
404 pthread_create (&ctx->id, &attr, coro_init, &args);
405
406 coro_transfer (args.main, args.self);
407 }
408 else
409 ctx->id = null_tid;
410}
411
412void
413coro_destroy (coro_context *ctx)
414{
415 if (!pthread_equal (ctx->id, null_tid))
416 {
417 pthread_cancel (ctx->id);
418 pthread_mutex_unlock (&coro_mutex);
419 pthread_join (ctx->id, 0);
420 pthread_mutex_lock (&coro_mutex);
421 }
422
423 pthread_cond_destroy (&ctx->cv);
424}
425
201#else 426#else
202#error "linux libc or architecture not supported" 427# error unsupported backend
203#endif 428#endif
204 429
205# elif CORO_IRIX
206
207 setjmp (ctx->env);
208 ctx->env[JB_PC] = (__uint64_t)coro_init;
209 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr,ssize);
210
211# endif
212
213 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
214
215#else
216error unsupported architecture
217#endif
218}
219

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines