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Comparing libcoro/coro.c (file contents):
Revision 1.2 by root, Mon Jul 23 22:09:39 2001 UTC vs.
Revision 1.42 by root, Mon Nov 10 04:37:23 2008 UTC

1/* 1/*
2 * Copyright (c) 2001 Marc Alexander Lehmann <pcg@goof.com> 2 * Copyright (c) 2001-2008 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 (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 (
106 #if _XOPEN_UNIX > 0
107 _setjmp (new_coro->env)
108 #else
109 sigsetjmp (new_coro->env, 0)
110 #endif
111 ) {
67 coro_init (); /* start it */ 112 coro_init (); /* start it */
113 }
68 else 114 else
69 trampoline_count++; 115 trampoline_done = 1;
70} 116}
71 117
72# endif
73
74#elif CORO_UCONTEXT
75# define coro_save(ctx) getcontext(&((ctx)->uc))
76#endif 118# endif
77 119
78/* initialize a machine state */ 120# 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
84 121
85 getcontext (&(ctx->uc)); 122 asm (
123 ".text\n"
124 ".globl coro_transfer\n"
125 ".type coro_transfer, @function\n"
126 "coro_transfer:\n"
127 #if __amd64
128 #define NUM_SAVED 6
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 #elif __i386
144 #define NUM_SAVED 4
145 "\tpush %ebp\n"
146 "\tpush %ebx\n"
147 "\tpush %esi\n"
148 "\tpush %edi\n"
149 "\tmov %esp, (%eax)\n"
150 "\tmov (%edx), %esp\n"
151 "\tpop %edi\n"
152 "\tpop %esi\n"
153 "\tpop %ebx\n"
154 "\tpop %ebp\n"
155 #else
156 #error unsupported architecture
157 #endif
158 "\tret\n"
159 );
86 160
87 ctx->uc.uc_link = 0; 161# 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;
91 162
92 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 163void
93 164coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
94#elif CORO_SJLJ || CORO_LOOSE 165{
95 166 coro_context nctx;
96# if CORO_SJLJ 167# if CORO_SJLJ
97 stack_t ostk, nstk; 168 stack_t ostk, nstk;
98 struct sigaction osa, nsa; 169 struct sigaction osa, nsa;
99 sigset_t nsig, osig; 170 sigset_t nsig, osig;
100# endif 171# endif
101 coro_context nctx; 172
173 if (!coro)
174 return;
102 175
103 coro_init_func = coro; 176 coro_init_func = coro;
104 coro_init_arg = arg; 177 coro_init_arg = arg;
105 178
106 new_coro = ctx; 179 new_coro = ctx;
… …
116 nsa.sa_handler = trampoline; 189 nsa.sa_handler = trampoline;
117 sigemptyset (&nsa.sa_mask); 190 sigemptyset (&nsa.sa_mask);
118 nsa.sa_flags = SA_ONSTACK; 191 nsa.sa_flags = SA_ONSTACK;
119 192
120 if (sigaction (SIGUSR2, &nsa, &osa)) 193 if (sigaction (SIGUSR2, &nsa, &osa))
194 {
121 perror ("sigaction"); 195 perror ("sigaction");
196 abort ();
197 }
122 198
123 /* set the new stack */ 199 /* set the new stack */
124 nstk.ss_sp = sptr; 200 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
125 nstk.ss_size = ssize; 201 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
126 nstk.ss_flags = 0; 202 nstk.ss_flags = 0;
127 203
128 if (sigaltstack (&nstk, &ostk) < 0) 204 if (sigaltstack (&nstk, &ostk) < 0)
205 {
129 perror ("sigaltstack"); 206 perror ("sigaltstack");
207 abort ();
208 }
130 209
131 trampoline_count = 0; 210 trampoline_done = 0;
132 kill (getpid (), SIGUSR2); 211 kill (getpid (), SIGUSR2);
133 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 212 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
134 213
135 while (!trampoline_count) 214 while (!trampoline_done)
136 sigsuspend (&nsig); 215 sigsuspend (&nsig);
137 216
138 sigaltstack (0, &nstk); 217 sigaltstack (0, &nstk);
139 nstk.ss_flags = SS_DISABLE; 218 nstk.ss_flags = SS_DISABLE;
140 if (sigaltstack (&nstk, 0) < 0) 219 if (sigaltstack (&nstk, 0) < 0)
… …
145 abort (); 224 abort ();
146 225
147 if (~ostk.ss_flags & SS_DISABLE) 226 if (~ostk.ss_flags & SS_DISABLE)
148 sigaltstack (&ostk, 0); 227 sigaltstack (&ostk, 0);
149 228
150 sigaction (SIGUSR1, &osa, 0); 229 sigaction (SIGUSR2, &osa, 0);
151
152 sigprocmask (SIG_SETMASK, &osig, 0); 230 sigprocmask (SIG_SETMASK, &osig, 0);
153 231
154# elif MS_LOOSE 232# elif CORO_LOSER
155 233
156 coro_save (ctx); 234 setjmp (ctx->env);
235 #if __CYGWIN__
157 ctx->env[7] = (int)((char *)sptr + ssize); 236 ctx->env[7] = (long)((char *)sptr + ssize) - sizeof (long);
158 ctx->env[8] = (int)coro; 237 ctx->env[8] = (long)coro_init;
159 238 #elif defined(_M_IX86)
239 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
240 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
241 #elif defined(_M_AMD64)
242 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
243 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
244 #elif defined(_M_IA64)
245 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
246 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
247 #else
248 #error "microsoft libc or architecture not supported"
160# endif 249 #endif
161 250
251# elif CORO_LINUX
252
253 _setjmp (ctx->env);
254 #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
255 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
256 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
257 #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
258 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
259 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize) - sizeof (long);
260 #elif defined (__GNU_LIBRARY__) && defined (__i386__)
261 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
262 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
263 #elif defined (__GNU_LIBRARY__) && defined (__amd64__)
264 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
265 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
266 #else
267 #error "linux libc or architecture not supported"
268 #endif
269
270# elif CORO_IRIX
271
272 sigsetjmp (ctx->env, 0);
273 ctx->env[JB_PC] = (__uint64_t)coro_init;
274 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
275
276# elif CORO_ASM
277
278 ctx->sp = (void **)(ssize + (char *)sptr);
279 *--ctx->sp = (void *)abort; /* needed for alignment only */
280 *--ctx->sp = (void *)coro_init;
281 ctx->sp -= NUM_SAVED;
282
283# elif CORO_UCONTEXT
284
285 getcontext (&(ctx->uc));
286
287 ctx->uc.uc_link = 0;
288 ctx->uc.uc_stack.ss_sp = sptr;
289 ctx->uc.uc_stack.ss_size = (size_t)ssize;
290 ctx->uc.uc_stack.ss_flags = 0;
291
292 makecontext (&(ctx->uc), (void (*)())coro_init, 0);
293
294# endif
295
296 coro_transfer (create_coro, new_coro);
297}
298
299/*****************************************************************************/
300/* pthread backend */
301/*****************************************************************************/
302#elif CORO_PTHREAD
303
304/* this mutex will be locked by the running coroutine */
305pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
306
307struct coro_init_args
308{
309 coro_func func;
310 void *arg;
311 coro_context *self, *main;
312};
313
314static pthread_t null_tid;
315
316/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */
317static void
318mutex_unlock_wrapper (void *arg)
319{
320 pthread_mutex_unlock ((pthread_mutex_t *)arg);
321}
322
323static void *
324coro_init (void *args_)
325{
326 struct coro_init_args *args = (struct coro_init_args *)args_;
327 coro_func func = args->func;
328 void *arg = args->arg;
329
330 pthread_mutex_lock (&coro_mutex);
331
332 /* we try to be good citizens and use deferred cancellation and cleanup handlers */
333 pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex);
334 coro_transfer (args->self, args->main);
335 func (arg);
336 pthread_cleanup_pop (1);
337
338 return 0;
339}
340
341void
162 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); 342coro_transfer (coro_context *prev, coro_context *next)
343{
344 pthread_cond_signal (&next->cv);
345 pthread_cond_wait (&prev->cv, &coro_mutex);
346}
347
348void
349coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
350{
351 static coro_context nctx;
352 static int once;
353
354 if (!once)
355 {
356 once = 1;
357
358 pthread_mutex_lock (&coro_mutex);
359 pthread_cond_init (&nctx.cv, 0);
360 null_tid = pthread_self ();
361 }
362
363 pthread_cond_init (&ctx->cv, 0);
364
365 if (coro)
366 {
367 pthread_attr_t attr;
368 struct coro_init_args args;
369
370 args.func = coro;
371 args.arg = arg;
372 args.self = ctx;
373 args.main = &nctx;
374
375 pthread_attr_init (&attr);
376 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
377 pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
378 pthread_create (&ctx->id, &attr, coro_init, &args);
379
380 coro_transfer (args.main, args.self);
381 }
382 else
383 ctx->id = null_tid;
384}
385
386void
387coro_destroy (coro_context *ctx)
388{
389 if (!pthread_equal (ctx->id, null_tid))
390 {
391 pthread_cancel (ctx->id);
392 pthread_mutex_unlock (&coro_mutex);
393 pthread_join (ctx->id, 0);
394 pthread_mutex_lock (&coro_mutex);
395 }
396
397 pthread_cond_destroy (&ctx->cv);
398}
163 399
164#else 400#else
165error unsupported architecture 401# error unsupported backend
166#endif 402#endif
167}
168 403

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