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Comparing libcoro/coro.c (file contents):
Revision 1.20 by root, Thu Oct 26 05:20:47 2006 UTC vs.
Revision 1.65 by root, Wed Dec 5 13:10:21 2012 UTC

1/* 1/*
2 * Copyright (c) 2001-2006 Marc Alexander Lehmann <schmorp@schmorp.de> 2 * Copyright (c) 2001-2011 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 * 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 *
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-
21 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 18 * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
… …
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);
90
91#if __GCC_HAVE_DWARF2_CFI_ASM && __amd64
92 asm (".cfi_undefined rip");
93#endif
77 94
78 func ((void *)arg); 95 func ((void *)arg);
79 96
80 /* the new coro returned. bad. just abort() for now */ 97 /* the new coro returned. bad. just abort() for now */
81 abort (); 98 abort ();
82} 99}
83 100
84# if CORO_SJLJ 101# if CORO_SJLJ
85 102
86static volatile int trampoline_count; 103static volatile int trampoline_done;
87 104
88/* trampoline signal handler */ 105/* trampoline signal handler */
89static void 106static void
90trampoline (int sig) 107trampoline (int sig)
91{ 108{
92 if (setjmp (((coro_context *)new_coro)->env)) 109 if (coro_setjmp (new_coro->env))
93 coro_init (); /* start it */ 110 coro_init (); /* start it */
94 else 111 else
95 trampoline_count++; 112 trampoline_done = 1;
96} 113}
97 114
98# endif
99
100#endif 115# endif
101 116
102/* initialize a machine state */ 117# 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
108 118
109 getcontext (&(ctx->uc)); 119 #if _WIN32 || __CYGWIN__
120 #define CORO_WIN_TIB 1
121 #endif
110 122
111 ctx->uc.uc_link = 0; 123 asm (
112 ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize); 124 "\t.text\n"
113 ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize); 125 #if _WIN32 || __CYGWIN__
114 ctx->uc.uc_stack.ss_flags = 0; 126 "\t.globl _coro_transfer\n"
127 "_coro_transfer:\n"
128 #else
129 "\t.globl coro_transfer\n"
130 "coro_transfer:\n"
131 #endif
132 /* windows, of course, gives a shit on the amd64 ABI and uses different registers */
133 /* http://blogs.msdn.com/freik/archive/2005/03/17/398200.aspx */
134 #if __amd64
115 135
116 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 136 #if _WIN32 || __CYGWIN__
137 #define NUM_SAVED 29
138 "\tsubq $168, %rsp\t" /* one dummy qword to improve alignment */
139 "\tmovaps %xmm6, (%rsp)\n"
140 "\tmovaps %xmm7, 16(%rsp)\n"
141 "\tmovaps %xmm8, 32(%rsp)\n"
142 "\tmovaps %xmm9, 48(%rsp)\n"
143 "\tmovaps %xmm10, 64(%rsp)\n"
144 "\tmovaps %xmm11, 80(%rsp)\n"
145 "\tmovaps %xmm12, 96(%rsp)\n"
146 "\tmovaps %xmm13, 112(%rsp)\n"
147 "\tmovaps %xmm14, 128(%rsp)\n"
148 "\tmovaps %xmm15, 144(%rsp)\n"
149 "\tpushq %rsi\n"
150 "\tpushq %rdi\n"
151 "\tpushq %rbp\n"
152 "\tpushq %rbx\n"
153 "\tpushq %r12\n"
154 "\tpushq %r13\n"
155 "\tpushq %r14\n"
156 "\tpushq %r15\n"
157 #if CORO_WIN_TIB
158 "\tpushq %fs:0x0\n"
159 "\tpushq %fs:0x8\n"
160 "\tpushq %fs:0xc\n"
161 #endif
162 "\tmovq %rsp, (%rcx)\n"
163 "\tmovq (%rdx), %rsp\n"
164 #if CORO_WIN_TIB
165 "\tpopq %fs:0xc\n"
166 "\tpopq %fs:0x8\n"
167 "\tpopq %fs:0x0\n"
168 #endif
169 "\tpopq %r15\n"
170 "\tpopq %r14\n"
171 "\tpopq %r13\n"
172 "\tpopq %r12\n"
173 "\tpopq %rbx\n"
174 "\tpopq %rbp\n"
175 "\tpopq %rdi\n"
176 "\tpopq %rsi\n"
177 "\tmovaps (%rsp), %xmm6\n"
178 "\tmovaps 16(%rsp), %xmm7\n"
179 "\tmovaps 32(%rsp), %xmm8\n"
180 "\tmovaps 48(%rsp), %xmm9\n"
181 "\tmovaps 64(%rsp), %xmm10\n"
182 "\tmovaps 80(%rsp), %xmm11\n"
183 "\tmovaps 96(%rsp), %xmm12\n"
184 "\tmovaps 112(%rsp), %xmm13\n"
185 "\tmovaps 128(%rsp), %xmm14\n"
186 "\tmovaps 144(%rsp), %xmm15\n"
187 "\taddq $168, %rsp\n"
188 #else
189 #define NUM_SAVED 6
190 "\tpushq %rbp\n"
191 "\tpushq %rbx\n"
192 "\tpushq %r12\n"
193 "\tpushq %r13\n"
194 "\tpushq %r14\n"
195 "\tpushq %r15\n"
196 "\tmovq %rsp, (%rdi)\n"
197 "\tmovq (%rsi), %rsp\n"
198 "\tpopq %r15\n"
199 "\tpopq %r14\n"
200 "\tpopq %r13\n"
201 "\tpopq %r12\n"
202 "\tpopq %rbx\n"
203 "\tpopq %rbp\n"
204 #endif
205 "\tpopq %rcx\n"
206 "\tjmpq *%rcx\n"
117 207
118#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX 208 #elif __i386
119 209
210 #define NUM_SAVED 4
211 "\tpushl %ebp\n"
212 "\tpushl %ebx\n"
213 "\tpushl %esi\n"
214 "\tpushl %edi\n"
215 #if CORO_WIN_TIB
216 #undef NUM_SAVED
217 #define NUM_SAVED 7
218 "\tpushl %fs:0\n"
219 "\tpushl %fs:4\n"
220 "\tpushl %fs:8\n"
221 #endif
222 "\tmovl %esp, (%eax)\n"
223 "\tmovl (%edx), %esp\n"
224 #if CORO_WIN_TIB
225 "\tpopl %fs:8\n"
226 "\tpopl %fs:4\n"
227 "\tpopl %fs:0\n"
228 #endif
229 "\tpopl %edi\n"
230 "\tpopl %esi\n"
231 "\tpopl %ebx\n"
232 "\tpopl %ebp\n"
233 "\tpopl %ecx\n"
234 "\tjmpl *%ecx\n"
235
236 #else
237 #error unsupported architecture
238 #endif
239 );
240
241# endif
242
243void
244coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
245{
246 coro_context nctx;
120# if CORO_SJLJ 247# if CORO_SJLJ
121 stack_t ostk, nstk; 248 stack_t ostk, nstk;
122 struct sigaction osa, nsa; 249 struct sigaction osa, nsa;
123 sigset_t nsig, osig; 250 sigset_t nsig, osig;
124# endif 251# endif
125 coro_context nctx; 252
253 if (!coro)
254 return;
126 255
127 coro_init_func = coro; 256 coro_init_func = coro;
128 coro_init_arg = arg; 257 coro_init_arg = arg;
129 258
130 new_coro = ctx; 259 new_coro = ctx;
… …
140 nsa.sa_handler = trampoline; 269 nsa.sa_handler = trampoline;
141 sigemptyset (&nsa.sa_mask); 270 sigemptyset (&nsa.sa_mask);
142 nsa.sa_flags = SA_ONSTACK; 271 nsa.sa_flags = SA_ONSTACK;
143 272
144 if (sigaction (SIGUSR2, &nsa, &osa)) 273 if (sigaction (SIGUSR2, &nsa, &osa))
274 {
145 perror ("sigaction"); 275 perror ("sigaction");
276 abort ();
277 }
146 278
147 /* set the new stack */ 279 /* set the new stack */
148 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */ 280 nstk.ss_sp = STACK_ADJUST_PTR (sptr, ssize); /* yes, some platforms (IRIX) get this wrong. */
149 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize); 281 nstk.ss_size = STACK_ADJUST_SIZE (sptr, ssize);
150 nstk.ss_flags = 0; 282 nstk.ss_flags = 0;
151 283
152 if (sigaltstack (&nstk, &ostk) < 0) 284 if (sigaltstack (&nstk, &ostk) < 0)
285 {
153 perror ("sigaltstack"); 286 perror ("sigaltstack");
287 abort ();
288 }
154 289
155 trampoline_count = 0; 290 trampoline_done = 0;
156 kill (getpid (), SIGUSR2); 291 kill (getpid (), SIGUSR2);
157 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 292 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
158 293
159 while (!trampoline_count) 294 while (!trampoline_done)
160 sigsuspend (&nsig); 295 sigsuspend (&nsig);
161 296
162 sigaltstack (0, &nstk); 297 sigaltstack (0, &nstk);
163 nstk.ss_flags = SS_DISABLE; 298 nstk.ss_flags = SS_DISABLE;
164 if (sigaltstack (&nstk, 0) < 0) 299 if (sigaltstack (&nstk, 0) < 0)
… …
170 305
171 if (~ostk.ss_flags & SS_DISABLE) 306 if (~ostk.ss_flags & SS_DISABLE)
172 sigaltstack (&ostk, 0); 307 sigaltstack (&ostk, 0);
173 308
174 sigaction (SIGUSR2, &osa, 0); 309 sigaction (SIGUSR2, &osa, 0);
175
176 sigprocmask (SIG_SETMASK, &osig, 0); 310 sigprocmask (SIG_SETMASK, &osig, 0);
177 311
178# elif CORO_LOSER 312# elif CORO_LOSER
179 313
180 setjmp (ctx->env); 314 coro_setjmp (ctx->env);
181 ctx->env[7] = (long)((char *)sptr + ssize); 315 #if __CYGWIN__ && __i386
182 ctx->env[8] = (long)coro_init; 316 ctx->env[8] = (long) coro_init;
317 ctx->env[7] = (long) ((char *)sptr + ssize) - sizeof (long);
318 #elif __CYGWIN__ && __x86_64
319 ctx->env[7] = (long) coro_init;
320 ctx->env[6] = (long) ((char *)sptr + ssize) - sizeof (long);
321 #elif defined __MINGW32__
322 ctx->env[5] = (long) coro_init;
323 ctx->env[4] = (long) ((char *)sptr + ssize) - sizeof (long);
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 (__int64);
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 (__int64);
333 #else
334 #error "microsoft libc or architecture not supported"
335 #endif
183 336
184# elif CORO_LINUX 337# elif CORO_LINUX
185 338
186 setjmp (ctx->env); 339 coro_setjmp (ctx->env);
187#if defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
188 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(JB_PC) && defined(JB_SP) 340 #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
189 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; 341 ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init;
190 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr,ssize); 342 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__) 343 #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
193 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; 344 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
194 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); 345 ctx->env[0].__jmpbuf[0].__sp = (int *) ((char *)sptr + ssize) - sizeof (long);
195#elif defined(__GNU_LIBRARY__) && defined(__i386__) 346 #elif defined (__GNU_LIBRARY__) && defined (__i386__)
196 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; 347 ctx->env[0].__jmpbuf[0].__pc = (char *) coro_init;
197 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); 348 ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long);
198#elif defined(__GNU_LIBRARY__) && defined(__amd64__) 349 #elif defined (__GNU_LIBRARY__) && defined (__amd64__)
199 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; 350 ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init;
200 ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr,ssize); 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 coro_setjmp (ctx->env, 0);
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 = (void **)(ssize + (char *)sptr);
365 *--ctx->sp = (void *)abort; /* needed for alignment only */
366 *--ctx->sp = (void *)coro_init;
367
368 #if CORO_WIN_TIB
369 *--ctx->sp = 0; /* ExceptionList */
370 *--ctx->sp = (char *)sptr + ssize; /* StackBase */
371 *--ctx->sp = sptr; /* StackLimit */
372 #endif
373
374 ctx->sp -= NUM_SAVED;
375 memset (ctx->sp, 0, sizeof (*ctx->sp) * NUM_SAVED);
376
377# elif CORO_UCONTEXT
378
379 getcontext (&(ctx->uc));
380
381 ctx->uc.uc_link = 0;
382 ctx->uc.uc_stack.ss_sp = sptr;
383 ctx->uc.uc_stack.ss_size = (size_t)ssize;
384 ctx->uc.uc_stack.ss_flags = 0;
385
386 makecontext (&(ctx->uc), (void (*)())coro_init, 0);
387
388# endif
389
390 coro_transfer (create_coro, new_coro);
391}
392
393/*****************************************************************************/
394/* pthread backend */
395/*****************************************************************************/
396#elif CORO_PTHREAD
397
398/* this mutex will be locked by the running coroutine */
399pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
400
401struct coro_init_args
402{
403 coro_func func;
404 void *arg;
405 coro_context *self, *main;
406};
407
408static pthread_t null_tid;
409
410/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */
411static void
412mutex_unlock_wrapper (void *arg)
413{
414 pthread_mutex_unlock ((pthread_mutex_t *)arg);
415}
416
417static void *
418coro_init (void *args_)
419{
420 struct coro_init_args *args = (struct coro_init_args *)args_;
421 coro_func func = args->func;
422 void *arg = args->arg;
423
424 pthread_mutex_lock (&coro_mutex);
425
426 /* we try to be good citizens and use deferred cancellation and cleanup handlers */
427 pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex);
428 coro_transfer (args->self, args->main);
429 func (arg);
430 pthread_cleanup_pop (1);
431
432 return 0;
433}
434
435void
436coro_transfer (coro_context *prev, coro_context *next)
437{
438 pthread_cond_signal (&next->cv);
439 pthread_cond_wait (&prev->cv, &coro_mutex);
440#if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */
441 pthread_testcancel ();
442#endif
443}
444
445void
446coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
447{
448 static coro_context nctx;
449 static int once;
450
451 if (!once)
452 {
453 once = 1;
454
455 pthread_mutex_lock (&coro_mutex);
456 pthread_cond_init (&nctx.cv, 0);
457 null_tid = pthread_self ();
458 }
459
460 pthread_cond_init (&ctx->cv, 0);
461
462 if (coro)
463 {
464 pthread_attr_t attr;
465 struct coro_init_args args;
466
467 args.func = coro;
468 args.arg = arg;
469 args.self = ctx;
470 args.main = &nctx;
471
472 pthread_attr_init (&attr);
473#if __UCLIBC__
474 /* exists, but is borked */
475 /*pthread_attr_setstacksize (&attr, (size_t)ssize);*/
476#elif __CYGWIN__
477 /* POSIX, not here */
478 pthread_attr_setstacksize (&attr, (size_t)ssize);
201#else 479#else
202#error "linux libc or architecture not supported" 480 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
203#endif 481#endif
482 pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
483 pthread_create (&ctx->id, &attr, coro_init, &args);
204 484
485 coro_transfer (args.main, args.self);
486 }
487 else
488 ctx->id = null_tid;
489}
490
491void
492coro_destroy (coro_context *ctx)
493{
494 if (!pthread_equal (ctx->id, null_tid))
495 {
496 pthread_cancel (ctx->id);
497 pthread_mutex_unlock (&coro_mutex);
498 pthread_join (ctx->id, 0);
499 pthread_mutex_lock (&coro_mutex);
500 }
501
502 pthread_cond_destroy (&ctx->cv);
503}
504
505/*****************************************************************************/
506/* fiber backend */
507/*****************************************************************************/
205# elif CORO_IRIX 508#elif CORO_FIBER
206 509
207 setjmp (ctx->env); 510#define WIN32_LEAN_AND_MEAN
208 ctx->env[JB_PC] = (__uint64_t)coro_init; 511#define _WIN32_WINNT 0x0400
209 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr,ssize); 512#include <windows.h>
210 513
211# endif 514VOID CALLBACK
515coro_init (PVOID arg)
516{
517 coro_context *ctx = (coro_context *)arg;
212 518
519 ctx->coro (ctx->arg);
520}
521
522void
213 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); 523coro_transfer (coro_context *prev, coro_context *next)
524{
525 if (!prev->fiber)
526 {
527 prev->fiber = GetCurrentFiber ();
528
529 if (prev->fiber == 0 || prev->fiber == (void *)0x1e00)
530 prev->fiber = ConvertThreadToFiber (0);
531 }
532
533 SwitchToFiber (next->fiber);
534}
535
536void
537coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
538{
539 ctx->fiber = 0;
540 ctx->coro = coro;
541 ctx->arg = arg;
542
543 if (!coro)
544 return;
545
546 ctx->fiber = CreateFiber (ssize, coro_init, ctx);
547}
548
549void
550coro_destroy (coro_context *ctx)
551{
552 DeleteFiber (ctx->fiber);
553}
214 554
215#else 555#else
216error unsupported architecture 556# error unsupported backend
217#endif 557#endif
218}
219 558

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