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Comparing libcoro/coro.c (file contents):
Revision 1.38 by root, Fri Nov 7 20:12:26 2008 UTC vs.
Revision 1.51 by root, Fri Apr 2 19:18:01 2010 UTC

1/* 1/*
2 * Copyright (c) 2001-2008 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,
… …
40 40
41#include "coro.h" 41#include "coro.h"
42 42
43#include <string.h> 43#include <string.h>
44 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
45#if !defined(STACK_ADJUST_PTR) 54# if !defined(STACK_ADJUST_PTR)
55# if __sgi
46/* IRIX is decidedly NON-unix */ 56/* IRIX is decidedly NON-unix */
47# if __sgi
48# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) 57# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
49# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8) 58# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8)
50# elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER) 59# elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER)
51# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss)) 60# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss))
52# define STACK_ADJUST_SIZE(sp,ss) (ss) 61# define STACK_ADJUST_SIZE(sp,ss) (ss)
53# elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER) 62# elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER)
54# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) 63# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
55# define STACK_ADJUST_SIZE(sp,ss) (ss) 64# define STACK_ADJUST_SIZE(sp,ss) (ss)
56# else 65# else
57# define STACK_ADJUST_PTR(sp,ss) (sp) 66# define STACK_ADJUST_PTR(sp,ss) (sp)
58# define STACK_ADJUST_SIZE(sp,ss) (ss) 67# define STACK_ADJUST_SIZE(sp,ss) (ss)
59# endif 68# endif
60#endif 69# endif
61
62#if CORO_UCONTEXT
63# include <stddef.h>
64#endif
65
66#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
67 70
68# include <stdlib.h> 71# include <stdlib.h>
69 72
70# if CORO_SJLJ 73# if CORO_SJLJ
71# include <stdio.h> 74# include <stdio.h>
72# include <signal.h> 75# include <signal.h>
73# include <unistd.h> 76# include <unistd.h>
74# endif 77# endif
75 78
76static volatile coro_func coro_init_func; 79static coro_func coro_init_func;
77static volatile void *coro_init_arg; 80static void *coro_init_arg;
78static volatile coro_context *new_coro, *create_coro; 81static coro_context *new_coro, *create_coro;
79
80/* what we really want to detect here is wether we use a new-enough version of GAS */
81/* instead, check for gcc 3, ELF and GNU/Linux and hope for the best */
82# if __GNUC__ >= 3 && __ELF__ && __linux__
83# define HAVE_CFI 1
84# endif
85 82
86static void 83static void
87coro_init (void) 84coro_init (void)
88{ 85{
89 volatile coro_func func = coro_init_func; 86 volatile coro_func func = coro_init_func;
90 volatile void *arg = coro_init_arg; 87 volatile void *arg = coro_init_arg;
91 88
92 coro_transfer ((coro_context *)new_coro, (coro_context *)create_coro); 89 coro_transfer (new_coro, create_coro);
93 90
94 func ((void *)arg); 91 func ((void *)arg);
95 92
96 /* the new coro returned. bad. just abort() for now */ 93 /* the new coro returned. bad. just abort() for now */
97 abort (); 94 abort ();
98} 95}
99 96
100# if CORO_SJLJ 97# if CORO_SJLJ
101 98
102static volatile int trampoline_count; 99static volatile int trampoline_done;
103 100
104/* trampoline signal handler */ 101/* trampoline signal handler */
105static void 102static void
106trampoline (int sig) 103trampoline (int sig)
107{ 104{
108 if (setjmp (((coro_context *)new_coro)->env)) 105 if (coro_setjmp (new_coro->env))
109 {
110# if HAVE_CFI
111 asm (".cfi_startproc");
112# endif
113 coro_init (); /* start it */ 106 coro_init (); /* start it */
114# if HAVE_CFI
115 asm (".cfi_endproc");
116# endif
117 }
118 else 107 else
119 trampoline_count++; 108 trampoline_done = 1;
120} 109}
121 110
122# endif
123
124#endif 111# endif
125 112
126#if CORO_ASM 113# if CORO_ASM
127 114
128 asm ( 115 asm (
129 ".text\n" 116 ".text\n"
130 ".globl coro_transfer\n" 117 ".globl coro_transfer\n"
131 ".type coro_transfer, @function\n" 118 ".type coro_transfer, @function\n"
132 "coro_transfer:\n" 119 "coro_transfer:\n"
133# if __amd64 120 #if __amd64
134# define NUM_SAVED 6 121 #define NUM_SAVED 6
135 "\tpush %rbp\n" 122 "\tpush %rbp\n"
136 "\tpush %rbx\n" 123 "\tpush %rbx\n"
137 "\tpush %r12\n" 124 "\tpush %r12\n"
138 "\tpush %r13\n" 125 "\tpush %r13\n"
139 "\tpush %r14\n" 126 "\tpush %r14\n"
140 "\tpush %r15\n" 127 "\tpush %r15\n"
128 #if CORO_WIN_TIB
129 "\tpush %fs:0x0\n"
130 "\tpush %fs:0x8\n"
131 "\tpush %fs:0xc\n"
132 #endif
141 "\tmov %rsp, (%rdi)\n" 133 "\tmov %rsp, (%rdi)\n"
142 "\tmov (%rsi), %rsp\n" 134 "\tmov (%rsi), %rsp\n"
135 #if CORO_WIN_TIB
136 "\tpop %fs:0xc\n"
137 "\tpop %fs:0x8\n"
138 "\tpop %fs:0x0\n"
139 #endif
143 "\tpop %r15\n" 140 "\tpop %r15\n"
144 "\tpop %r14\n" 141 "\tpop %r14\n"
145 "\tpop %r13\n" 142 "\tpop %r13\n"
146 "\tpop %r12\n" 143 "\tpop %r12\n"
147 "\tpop %rbx\n" 144 "\tpop %rbx\n"
148 "\tpop %rbp\n" 145 "\tpop %rbp\n"
149# elif __i386 146 #elif __i386
150# define NUM_SAVED 4 147 #define NUM_SAVED 4
151 "\tpush %ebp\n" 148 "\tpush %ebp\n"
152 "\tpush %ebx\n" 149 "\tpush %ebx\n"
153 "\tpush %esi\n" 150 "\tpush %esi\n"
154 "\tpush %edi\n" 151 "\tpush %edi\n"
152 #if CORO_WIN_TIB
153 "\tpush %fs:0\n"
154 "\tpush %fs:4\n"
155 "\tpush %fs:8\n"
156 #endif
155 "\tmov %esp, (%eax)\n" 157 "\tmov %esp, (%eax)\n"
156 "\tmov (%edx), %esp\n" 158 "\tmov (%edx), %esp\n"
159 #if CORO_WIN_TIB
160 "\tpop %fs:8\n"
161 "\tpop %fs:4\n"
162 "\tpop %fs:0\n"
163 #endif
157 "\tpop %edi\n" 164 "\tpop %edi\n"
158 "\tpop %esi\n" 165 "\tpop %esi\n"
159 "\tpop %ebx\n" 166 "\tpop %ebx\n"
160 "\tpop %ebp\n" 167 "\tpop %ebp\n"
161# else 168 #else
162# error unsupported architecture 169 #error unsupported architecture
163# endif 170 #endif
164 "\tret\n" 171 "\tret\n"
165 ); 172 );
166 173
167#endif 174# endif
168 175
176void
177coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
178{
179 coro_context nctx;
180# if CORO_SJLJ
181 stack_t ostk, nstk;
182 struct sigaction osa, nsa;
183 sigset_t nsig, osig;
184# endif
185
186 if (!coro)
187 return;
188
189 coro_init_func = coro;
190 coro_init_arg = arg;
191
192 new_coro = ctx;
193 create_coro = &nctx;
194
195# if CORO_SJLJ
196 /* we use SIGUSR2. first block it, then fiddle with it. */
197
198 sigemptyset (&nsig);
199 sigaddset (&nsig, SIGUSR2);
200 sigprocmask (SIG_BLOCK, &nsig, &osig);
201
202 nsa.sa_handler = trampoline;
203 sigemptyset (&nsa.sa_mask);
204 nsa.sa_flags = SA_ONSTACK;
205
206 if (sigaction (SIGUSR2, &nsa, &osa))
207 {
208 perror ("sigaction");
209 abort ();
210 }
211
212 /* set the new stack */
213 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
214 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
215 nstk.ss_flags = 0;
216
217 if (sigaltstack (&nstk, &ostk) < 0)
218 {
219 perror ("sigaltstack");
220 abort ();
221 }
222
223 trampoline_done = 0;
224 kill (getpid (), SIGUSR2);
225 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
226
227 while (!trampoline_done)
228 sigsuspend (&nsig);
229
230 sigaltstack (0, &nstk);
231 nstk.ss_flags = SS_DISABLE;
232 if (sigaltstack (&nstk, 0) < 0)
233 perror ("sigaltstack");
234
235 sigaltstack (0, &nstk);
236 if (~nstk.ss_flags & SS_DISABLE)
237 abort ();
238
239 if (~ostk.ss_flags & SS_DISABLE)
240 sigaltstack (&ostk, 0);
241
242 sigaction (SIGUSR2, &osa, 0);
243 sigprocmask (SIG_SETMASK, &osig, 0);
244
245# elif CORO_LOSER
246
247 coro_setjmp (ctx->env);
248 #if __CYGWIN__ && __i386
249 ctx->env[8] = (long) coro_init;
250 ctx->env[7] = (long) ((char *)sptr + ssize) - sizeof (long);
251 #elif __CYGWIN__ && __x86_64
252 ctx->env[7] = (long) coro_init;
253 ctx->env[6] = (long) ((char *)sptr + ssize) - sizeof (long);
254 #elif defined(__MINGW32__)
255 ctx->env[5] = (long) coro_init;
256 ctx->env[4] = (long) ((char *)sptr + ssize) - sizeof (long);
257 #elif defined(_M_IX86)
258 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long) coro_init;
259 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
260 #elif defined(_M_AMD64)
261 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64) coro_init;
262 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64);
263 #elif defined(_M_IA64)
264 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64) coro_init;
265 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64);
266 #else
267 #error "microsoft libc or architecture not supported"
268 #endif
269
270# elif CORO_LINUX
271
272 coro_setjmp (ctx->env);
273 #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
274 ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init;
275 ctx->env[0].__jmpbuf[JB_SP] = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
276 #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
277 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
278 ctx->env[0].__jmpbuf[0].__sp = (int *) ((char *)sptr + ssize) - sizeof (long);
279 #elif defined (__GNU_LIBRARY__) && defined (__i386__)
280 ctx->env[0].__jmpbuf[0].__pc = (char *) coro_init;
281 ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long);
282 #elif defined (__GNU_LIBRARY__) && defined (__amd64__)
283 ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init;
284 ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long);
285 #else
286 #error "linux libc or architecture not supported"
287 #endif
288
289# elif CORO_IRIX
290
291 coro_setjmp (ctx->env, 0);
292 ctx->env[JB_PC] = (__uint64_t)coro_init;
293 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
294
295# elif CORO_ASM
296
297 ctx->sp = (void **)(ssize + (char *)sptr);
298 *--ctx->sp = (void *)abort; /* needed for alignment only */
299 *--ctx->sp = (void *)coro_init;
300
301 #if CORO_WIN_TIB
302 *--ctx->sp = 0; /* ExceptionList */
303 *--ctx->sp = (char *)sptr + ssize; /* StackBase */
304 *--ctx->sp = sptr; /* StackLimit */
305 #endif
306
307 ctx->sp -= NUM_SAVED;
308
309# elif CORO_UCONTEXT
310
311 getcontext (&(ctx->uc));
312
313 ctx->uc.uc_link = 0;
314 ctx->uc.uc_stack.ss_sp = sptr;
315 ctx->uc.uc_stack.ss_size = (size_t)ssize;
316 ctx->uc.uc_stack.ss_flags = 0;
317
318 makecontext (&(ctx->uc), (void (*)())coro_init, 0);
319
320# endif
321
322 coro_transfer (create_coro, new_coro);
323}
324
325/*****************************************************************************/
326/* pthread backend */
327/*****************************************************************************/
169#if CORO_PTHREAD 328#elif CORO_PTHREAD
170 329
171/* this mutex will be locked by the running coroutine */ 330/* this mutex will be locked by the running coroutine */
172pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; 331pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
173 332
174struct coro_init_args 333struct coro_init_args
… …
186{ 345{
187 pthread_mutex_unlock ((pthread_mutex_t *)arg); 346 pthread_mutex_unlock ((pthread_mutex_t *)arg);
188} 347}
189 348
190static void * 349static void *
191trampoline (void *args_) 350coro_init (void *args_)
192{ 351{
193 struct coro_init_args *args = (struct coro_init_args *)args_; 352 struct coro_init_args *args = (struct coro_init_args *)args_;
194 coro_func func = args->func; 353 coro_func func = args->func;
195 void *arg = args->arg; 354 void *arg = args->arg;
196 355
… …
208void 367void
209coro_transfer (coro_context *prev, coro_context *next) 368coro_transfer (coro_context *prev, coro_context *next)
210{ 369{
211 pthread_cond_signal (&next->cv); 370 pthread_cond_signal (&next->cv);
212 pthread_cond_wait (&prev->cv, &coro_mutex); 371 pthread_cond_wait (&prev->cv, &coro_mutex);
372#if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */
373 pthread_testcancel ();
374#endif
375}
376
377void
378coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
379{
380 static coro_context nctx;
381 static int once;
382
383 if (!once)
384 {
385 once = 1;
386
387 pthread_mutex_lock (&coro_mutex);
388 pthread_cond_init (&nctx.cv, 0);
389 null_tid = pthread_self ();
390 }
391
392 pthread_cond_init (&ctx->cv, 0);
393
394 if (coro)
395 {
396 pthread_attr_t attr;
397 struct coro_init_args args;
398
399 args.func = coro;
400 args.arg = arg;
401 args.self = ctx;
402 args.main = &nctx;
403
404 pthread_attr_init (&attr);
405 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
406 pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
407 pthread_create (&ctx->id, &attr, coro_init, &args);
408
409 coro_transfer (args.main, args.self);
410 }
411 else
412 ctx->id = null_tid;
213} 413}
214 414
215void 415void
216coro_destroy (coro_context *ctx) 416coro_destroy (coro_context *ctx)
217{ 417{
… …
224 } 424 }
225 425
226 pthread_cond_destroy (&ctx->cv); 426 pthread_cond_destroy (&ctx->cv);
227} 427}
228 428
229#endif
230
231/* initialize a machine state */
232void
233coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
234{
235#if CORO_UCONTEXT
236
237 if (!coro)
238 return;
239
240 getcontext (&(ctx->uc));
241
242 ctx->uc.uc_link = 0;
243 ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize);
244 ctx->uc.uc_stack.ss_size = (size_t)STACK_ADJUST_SIZE (sptr,ssize);
245 ctx->uc.uc_stack.ss_flags = 0;
246
247 makecontext (&(ctx->uc), (void (*)())coro, 1, arg);
248
249#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
250
251# if CORO_SJLJ
252 stack_t ostk, nstk;
253 struct sigaction osa, nsa;
254 sigset_t nsig, osig;
255# endif
256 coro_context nctx;
257
258 if (!coro)
259 return;
260
261 coro_init_func = coro;
262 coro_init_arg = arg;
263
264 new_coro = ctx;
265 create_coro = &nctx;
266
267# if CORO_SJLJ
268 /* we use SIGUSR2. first block it, then fiddle with it. */
269
270 sigemptyset (&nsig);
271 sigaddset (&nsig, SIGUSR2);
272 sigprocmask (SIG_BLOCK, &nsig, &osig);
273
274 nsa.sa_handler = trampoline;
275 sigemptyset (&nsa.sa_mask);
276 nsa.sa_flags = SA_ONSTACK;
277
278 if (sigaction (SIGUSR2, &nsa, &osa))
279 {
280 perror ("sigaction");
281 abort ();
282 }
283
284 /* set the new stack */
285 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
286 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
287 nstk.ss_flags = 0;
288
289 if (sigaltstack (&nstk, &ostk) < 0)
290 {
291 perror ("sigaltstack");
292 abort ();
293 }
294
295 trampoline_count = 0;
296 kill (getpid (), SIGUSR2);
297 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
298
299 while (!trampoline_count)
300 sigsuspend (&nsig);
301
302 sigaltstack (0, &nstk);
303 nstk.ss_flags = SS_DISABLE;
304 if (sigaltstack (&nstk, 0) < 0)
305 perror ("sigaltstack");
306
307 sigaltstack (0, &nstk);
308 if (~nstk.ss_flags & SS_DISABLE)
309 abort ();
310
311 if (~ostk.ss_flags & SS_DISABLE)
312 sigaltstack (&ostk, 0);
313
314 sigaction (SIGUSR2, &osa, 0);
315
316 sigprocmask (SIG_SETMASK, &osig, 0);
317
318# elif CORO_LOSER
319
320 setjmp (ctx->env);
321#if __CYGWIN__
322 ctx->env[7] = (long)((char *)sptr + ssize) - sizeof (long);
323 ctx->env[8] = (long)coro_init;
324#elif defined(_M_IX86)
325 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
326 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
327#elif defined(_M_AMD64)
328 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
329 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
330#elif defined(_M_IA64)
331 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
332 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
333#else
334# error "microsoft libc or architecture not supported"
335#endif
336
337# elif CORO_LINUX
338
339 _setjmp (ctx->env);
340#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
341 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
342 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
343#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
344 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
345 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize) - sizeof (long);
346#elif defined (__GNU_LIBRARY__) && defined (__i386__)
347 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
348 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
349#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
350 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
351 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
352#else
353# error "linux libc or architecture not supported"
354#endif
355
356# elif CORO_IRIX
357
358 setjmp (ctx->env);
359 ctx->env[JB_PC] = (__uint64_t)coro_init;
360 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
361
362# elif CORO_ASM
363
364 ctx->sp = (volatile void **)(ssize + (char *)sptr);
365 *--ctx->sp = (void *)abort; /* needed for alignment only */
366 *--ctx->sp = (void *)coro_init;
367 ctx->sp -= NUM_SAVED;
368
369# endif
370
371 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
372
373# elif CORO_PTHREAD
374
375 static coro_context nctx;
376 static int once;
377
378 if (!once)
379 {
380 once = 1;
381
382 pthread_mutex_lock (&coro_mutex);
383 pthread_cond_init (&nctx.cv, 0);
384 null_tid = pthread_self ();
385 }
386
387 pthread_cond_init (&ctx->cv, 0);
388
389 if (coro)
390 {
391 pthread_attr_t attr;
392 struct coro_init_args args;
393
394 args.func = coro;
395 args.arg = arg;
396 args.self = ctx;
397 args.main = &nctx;
398
399 pthread_attr_init (&attr);
400 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
401 pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
402 pthread_create (&ctx->id, &attr, trampoline, &args);
403
404 coro_transfer (args.main, args.self);
405 }
406 else
407 ctx->id = null_tid;
408
409#else 429#else
410# error unsupported backend 430# error unsupported backend
411#endif 431#endif
412}
413 432

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