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Comparing libcoro/coro.c (file contents):
Revision 1.3 by root, Mon Jul 23 22:16:38 2001 UTC vs.
Revision 1.50 by root, Fri Apr 2 19:13:54 2010 UTC

1/* 1/*
2 * Copyright (c) 2001 Marc Alexander Lehmann <pcg@goof.com> 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
35#if CORO_LOOSE || CORO_SJLJ 43#include <string.h>
36 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
54# if !defined(STACK_ADJUST_PTR)
55# if __sgi
56/* IRIX is decidedly NON-unix */
57# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
58# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8)
59# elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER)
60# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss))
61# define STACK_ADJUST_SIZE(sp,ss) (ss)
62# elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER)
63# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
64# define STACK_ADJUST_SIZE(sp,ss) (ss)
65# else
66# define STACK_ADJUST_PTR(sp,ss) (sp)
67# define STACK_ADJUST_SIZE(sp,ss) (ss)
68# endif
69# endif
70
71# include <stdlib.h>
72
73# if CORO_SJLJ
74# include <stdio.h>
37#include <signal.h> 75# include <signal.h>
76# include <unistd.h>
77# endif
38 78
39static volatile coro_func coro_init_func; 79static coro_func coro_init_func;
40static volatile void *coro_init_arg; 80static void *coro_init_arg;
41static volatile coro_context *new_coro, *create_coro; 81static coro_context *new_coro, *create_coro;
42 82
43static void 83static void
44coro_init (void) 84coro_init (void)
45{ 85{
46 volatile coro_func func = coro_init_func; 86 volatile coro_func func = coro_init_func;
47 volatile void *arg = coro_init_arg; 87 volatile void *arg = coro_init_arg;
48 88
49 coro_transfer ((coro_context *)new_coro, (coro_context *)create_coro); 89 coro_transfer (new_coro, create_coro);
50 90
51 func ((void *)arg); 91 func ((void *)arg);
52 92
53 /* the new coro returned. bad. just abort() for now */ 93 /* the new coro returned. bad. just abort() for now */
54 abort (); 94 abort ();
55} 95}
56 96
57# if CORO_SJLJ 97# if CORO_SJLJ
58# define coro_save(ctx) (void)setjmp((ctx)->env)
59 98
60static volatile int trampoline_count; 99static volatile int trampoline_done;
61 100
62/* trampoline signal handler */ 101/* trampoline signal handler */
63static void 102static void
64trampoline(int sig) 103trampoline (int sig)
65{ 104{
66 if (setjmp (((coro_context *)new_coro)->env)) 105 if (coro_setjmp (new_coro->env))
67 coro_init (); /* start it */ 106 coro_init (); /* start it */
68 else 107 else
69 trampoline_count++; 108 trampoline_done = 1;
70} 109}
71 110
72# endif
73
74#elif CORO_UCONTEXT
75# define coro_save(ctx) getcontext(&((ctx)->uc))
76#endif 111# endif
77 112
78/* initialize a machine state */ 113# if CORO_ASM
79void coro_create(coro_context *ctx,
80 coro_func coro, void *arg,
81 void *sptr, long ssize)
82{
83#if CORO_UCONTEXT
84 114
85 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 #define NUM_SAVED 6
122 "\tpush %rbp\n"
123 "\tpush %rbx\n"
124 "\tpush %r12\n"
125 "\tpush %r13\n"
126 "\tpush %r14\n"
127 "\tpush %r15\n"
128 #if CORO_WIN_TIB
129 "\tpush %fs:0xc\n"
130 "\tpush %fs:0x8\n"
131 "\tpush %fs:0x0\n"
132 #endif
133 "\tmov %rsp, (%rdi)\n"
134 "\tmov (%rsi), %rsp\n"
135 #if CORO_WIN_TIB
136 "\tpop %fs:0x0\n"
137 "\tpop %fs:0x8\n"
138 "\tpop %fs:0xc\n"
139 #endif
140 "\tpop %r15\n"
141 "\tpop %r14\n"
142 "\tpop %r13\n"
143 "\tpop %r12\n"
144 "\tpop %rbx\n"
145 "\tpop %rbp\n"
146 #elif __i386
147 #define NUM_SAVED 4
148 "\tpush %ebp\n"
149 "\tpush %ebx\n"
150 "\tpush %esi\n"
151 "\tpush %edi\n"
152 #if CORO_WIN_TIB
153 "\tpush %fs:8\n"
154 "\tpush %fs:4\n"
155 "\tpush %fs:0\n"
156 #endif
157 "\tmov %esp, (%eax)\n"
158 "\tmov (%edx), %esp\n"
159 #if CORO_WIN_TIB
160 "\tpop %fs:0\n"
161 "\tpop %fs:4\n"
162 "\tpop %fs:8\n"
163 #endif
164 "\tpop %edi\n"
165 "\tpop %esi\n"
166 "\tpop %ebx\n"
167 "\tpop %ebp\n"
168 #else
169 #error unsupported architecture
170 #endif
171 "\tret\n"
172 );
86 173
87 ctx->uc.uc_link = 0; 174# endif
88 ctx->uc.uc_stack.ss_sp = sptr;
89 ctx->uc.uc_stack.ss_size = (size_t) ssize;
90 ctx->uc.uc_stack.ss_flags = 0;
91 175
92 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 176void
93 177coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
94#elif CORO_SJLJ || CORO_LOOSE 178{
95 179 coro_context nctx;
96# if CORO_SJLJ 180# if CORO_SJLJ
97 stack_t ostk, nstk; 181 stack_t ostk, nstk;
98 struct sigaction osa, nsa; 182 struct sigaction osa, nsa;
99 sigset_t nsig, osig; 183 sigset_t nsig, osig;
100# endif 184# endif
101 coro_context nctx; 185
186 if (!coro)
187 return;
102 188
103 coro_init_func = coro; 189 coro_init_func = coro;
104 coro_init_arg = arg; 190 coro_init_arg = arg;
105 191
106 new_coro = ctx; 192 new_coro = ctx;
… …
116 nsa.sa_handler = trampoline; 202 nsa.sa_handler = trampoline;
117 sigemptyset (&nsa.sa_mask); 203 sigemptyset (&nsa.sa_mask);
118 nsa.sa_flags = SA_ONSTACK; 204 nsa.sa_flags = SA_ONSTACK;
119 205
120 if (sigaction (SIGUSR2, &nsa, &osa)) 206 if (sigaction (SIGUSR2, &nsa, &osa))
207 {
121 perror ("sigaction"); 208 perror ("sigaction");
209 abort ();
210 }
122 211
123 /* set the new stack */ 212 /* set the new stack */
124 nstk.ss_sp = sptr; 213 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
125 nstk.ss_size = ssize; 214 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
126 nstk.ss_flags = 0; 215 nstk.ss_flags = 0;
127 216
128 if (sigaltstack (&nstk, &ostk) < 0) 217 if (sigaltstack (&nstk, &ostk) < 0)
218 {
129 perror ("sigaltstack"); 219 perror ("sigaltstack");
220 abort ();
221 }
130 222
131 trampoline_count = 0; 223 trampoline_done = 0;
132 kill (getpid (), SIGUSR2); 224 kill (getpid (), SIGUSR2);
133 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 225 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
134 226
135 while (!trampoline_count) 227 while (!trampoline_done)
136 sigsuspend (&nsig); 228 sigsuspend (&nsig);
137 229
138 sigaltstack (0, &nstk); 230 sigaltstack (0, &nstk);
139 nstk.ss_flags = SS_DISABLE; 231 nstk.ss_flags = SS_DISABLE;
140 if (sigaltstack (&nstk, 0) < 0) 232 if (sigaltstack (&nstk, 0) < 0)
… …
145 abort (); 237 abort ();
146 238
147 if (~ostk.ss_flags & SS_DISABLE) 239 if (~ostk.ss_flags & SS_DISABLE)
148 sigaltstack (&ostk, 0); 240 sigaltstack (&ostk, 0);
149 241
150 sigaction (SIGUSR1, &osa, 0); 242 sigaction (SIGUSR2, &osa, 0);
151
152 sigprocmask (SIG_SETMASK, &osig, 0); 243 sigprocmask (SIG_SETMASK, &osig, 0);
153 244
154# elif MS_LOOSE 245# elif CORO_LOSER
155 246
156 coro_save (ctx); 247 coro_setjmp (ctx->env);
157 ctx->env[7] = (int)((char *)sptr + ssize); 248 #if __CYGWIN__ && __i386
158 ctx->env[8] = (int)coro; 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
159 269
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 ctx->sp -= NUM_SAVED;
301
302 #if CORO_WIN_TIB
303 *--ctx->sp = sptr; /* StackLimit */
304 *--ctx->sp = (char *)sptr + ssize; /* StackBase */
305 *--ctx->sp = 0; /* ExceptionList */
306 #endif
307
308# elif CORO_UCONTEXT
309
310 getcontext (&(ctx->uc));
311
312 ctx->uc.uc_link = 0;
313 ctx->uc.uc_stack.ss_sp = sptr;
314 ctx->uc.uc_stack.ss_size = (size_t)ssize;
315 ctx->uc.uc_stack.ss_flags = 0;
316
317 makecontext (&(ctx->uc), (void (*)())coro_init, 0);
318
319# endif
320
321 coro_transfer (create_coro, new_coro);
322}
323
324/*****************************************************************************/
325/* pthread backend */
326/*****************************************************************************/
327#elif CORO_PTHREAD
328
329/* this mutex will be locked by the running coroutine */
330pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
331
332struct coro_init_args
333{
334 coro_func func;
335 void *arg;
336 coro_context *self, *main;
337};
338
339static pthread_t null_tid;
340
341/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */
342static void
343mutex_unlock_wrapper (void *arg)
344{
345 pthread_mutex_unlock ((pthread_mutex_t *)arg);
346}
347
348static void *
349coro_init (void *args_)
350{
351 struct coro_init_args *args = (struct coro_init_args *)args_;
352 coro_func func = args->func;
353 void *arg = args->arg;
354
355 pthread_mutex_lock (&coro_mutex);
356
357 /* we try to be good citizens and use deferred cancellation and cleanup handlers */
358 pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex);
359 coro_transfer (args->self, args->main);
360 func (arg);
361 pthread_cleanup_pop (1);
362
363 return 0;
364}
365
366void
367coro_transfer (coro_context *prev, coro_context *next)
368{
369 pthread_cond_signal (&next->cv);
370 pthread_cond_wait (&prev->cv, &coro_mutex);
371#if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */
372 pthread_testcancel ();
160# endif 373#endif
374}
161 375
162 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); 376void
377coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
378{
379 static coro_context nctx;
380 static int once;
381
382 if (!once)
383 {
384 once = 1;
385
386 pthread_mutex_lock (&coro_mutex);
387 pthread_cond_init (&nctx.cv, 0);
388 null_tid = pthread_self ();
389 }
390
391 pthread_cond_init (&ctx->cv, 0);
392
393 if (coro)
394 {
395 pthread_attr_t attr;
396 struct coro_init_args args;
397
398 args.func = coro;
399 args.arg = arg;
400 args.self = ctx;
401 args.main = &nctx;
402
403 pthread_attr_init (&attr);
404 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
405 pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
406 pthread_create (&ctx->id, &attr, coro_init, &args);
407
408 coro_transfer (args.main, args.self);
409 }
410 else
411 ctx->id = null_tid;
412}
413
414void
415coro_destroy (coro_context *ctx)
416{
417 if (!pthread_equal (ctx->id, null_tid))
418 {
419 pthread_cancel (ctx->id);
420 pthread_mutex_unlock (&coro_mutex);
421 pthread_join (ctx->id, 0);
422 pthread_mutex_lock (&coro_mutex);
423 }
424
425 pthread_cond_destroy (&ctx->cv);
426}
163 427
164#else 428#else
165error unsupported architecture 429# error unsupported backend
166#endif 430#endif
167}
168 431

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