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Comparing libcoro/coro.c (file contents):
Revision 1.4 by root, Tue Jul 24 19:52:55 2001 UTC vs.
Revision 1.46 by root, Sat Jul 11 14:24:13 2009 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 || CORO_LINUX 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 "\tmov %rsp, (%rdi)\n"
129 "\tmov (%rsi), %rsp\n"
130 "\tpop %r15\n"
131 "\tpop %r14\n"
132 "\tpop %r13\n"
133 "\tpop %r12\n"
134 "\tpop %rbx\n"
135 "\tpop %rbp\n"
136 #elif __i386
137 #define NUM_SAVED 4
138 "\tpush %ebp\n"
139 "\tpush %ebx\n"
140 "\tpush %esi\n"
141 "\tpush %edi\n"
142 "\tmov %esp, (%eax)\n"
143 "\tmov (%edx), %esp\n"
144 "\tpop %edi\n"
145 "\tpop %esi\n"
146 "\tpop %ebx\n"
147 "\tpop %ebp\n"
148 #else
149 #error unsupported architecture
150 #endif
151 "\tret\n"
152 );
86 153
87 ctx->uc.uc_link = 0; 154# 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;
91 155
92 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 156void
93 157coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
94#elif CORO_SJLJ || CORO_LOOSE || CORO_LINUX 158{
95 159 coro_context nctx;
96# if CORO_SJLJ 160# if CORO_SJLJ
97 stack_t ostk, nstk; 161 stack_t ostk, nstk;
98 struct sigaction osa, nsa; 162 struct sigaction osa, nsa;
99 sigset_t nsig, osig; 163 sigset_t nsig, osig;
100# endif 164# endif
101 coro_context nctx; 165
166 if (!coro)
167 return;
102 168
103 coro_init_func = coro; 169 coro_init_func = coro;
104 coro_init_arg = arg; 170 coro_init_arg = arg;
105 171
106 new_coro = ctx; 172 new_coro = ctx;
… …
116 nsa.sa_handler = trampoline; 182 nsa.sa_handler = trampoline;
117 sigemptyset (&nsa.sa_mask); 183 sigemptyset (&nsa.sa_mask);
118 nsa.sa_flags = SA_ONSTACK; 184 nsa.sa_flags = SA_ONSTACK;
119 185
120 if (sigaction (SIGUSR2, &nsa, &osa)) 186 if (sigaction (SIGUSR2, &nsa, &osa))
187 {
121 perror ("sigaction"); 188 perror ("sigaction");
189 abort ();
190 }
122 191
123 /* set the new stack */ 192 /* set the new stack */
124 nstk.ss_sp = sptr; 193 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
125 nstk.ss_size = ssize; 194 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
126 nstk.ss_flags = 0; 195 nstk.ss_flags = 0;
127 196
128 if (sigaltstack (&nstk, &ostk) < 0) 197 if (sigaltstack (&nstk, &ostk) < 0)
198 {
129 perror ("sigaltstack"); 199 perror ("sigaltstack");
200 abort ();
201 }
130 202
131 trampoline_count = 0; 203 trampoline_done = 0;
132 kill (getpid (), SIGUSR2); 204 kill (getpid (), SIGUSR2);
133 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 205 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
134 206
135 while (!trampoline_count) 207 while (!trampoline_done)
136 sigsuspend (&nsig); 208 sigsuspend (&nsig);
137 209
138 sigaltstack (0, &nstk); 210 sigaltstack (0, &nstk);
139 nstk.ss_flags = SS_DISABLE; 211 nstk.ss_flags = SS_DISABLE;
140 if (sigaltstack (&nstk, 0) < 0) 212 if (sigaltstack (&nstk, 0) < 0)
… …
145 abort (); 217 abort ();
146 218
147 if (~ostk.ss_flags & SS_DISABLE) 219 if (~ostk.ss_flags & SS_DISABLE)
148 sigaltstack (&ostk, 0); 220 sigaltstack (&ostk, 0);
149 221
150 sigaction (SIGUSR1, &osa, 0); 222 sigaction (SIGUSR2, &osa, 0);
151
152 sigprocmask (SIG_SETMASK, &osig, 0); 223 sigprocmask (SIG_SETMASK, &osig, 0);
153 224
154# elif CORO_LOOSE 225# elif CORO_LOSER
155 226
156 setjmp (ctx->env); 227 coro_setjmp (ctx->env);
228 #if __CYGWIN__
157 ctx->env[7] = (int)((char *)sptr + ssize); 229 ctx->env[7] = (long)((char *)sptr + ssize) - sizeof (long);
158 ctx->env[8] = (int)coro_init; 230 ctx->env[8] = (long)coro_init;
231 #elif defined(__MINGW32__)
232 ctx->env[4] = (long)((char *)sptr + ssize) - sizeof (long);
233 ctx->env[5] = (long)coro_init;
234 #elif defined(_M_IX86)
235 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
236 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
237 #elif defined(_M_AMD64)
238 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
239 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
240 #elif defined(_M_IA64)
241 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
242 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
243 #else
244 #error "microsoft libc or architecture not supported"
245 #endif
159 246
160# elif CORO_LINUX 247# elif CORO_LINUX
161 248
162 setjmp (ctx->env); 249 coro_setjmp (ctx->env);
163#if defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
164 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(JB_PC) && defined(JB_SP) 250 #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
165 ctx->env[0].__jmpbuf[JB_PC] = (int)coro_init; 251 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
166 ctx->env[0].__jmpbuf[JB_SP] = (int)((char *)sptr + ssize); 252 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
167#elif defined(__GLIBC__) && defined(__GLIBC_MINOR__) \
168 && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined(__mc68000__) 253 #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
169 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; 254 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
170 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); 255 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize) - sizeof (long);
171#elif defined(__GNU_LIBRARY__) && defined(__i386__) 256 #elif defined (__GNU_LIBRARY__) && defined (__i386__)
172 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; 257 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
173 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); 258 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
259 #elif defined (__GNU_LIBRARY__) && defined (__amd64__)
260 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
261 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
262 #else
263 #error "linux libc or architecture not supported"
264 #endif
265
266# elif CORO_IRIX
267
268 coro_setjmp (ctx->env, 0);
269 ctx->env[JB_PC] = (__uint64_t)coro_init;
270 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
271
272# elif CORO_ASM
273
274 ctx->sp = (void **)(ssize + (char *)sptr);
275 *--ctx->sp = (void *)abort; /* needed for alignment only */
276 *--ctx->sp = (void *)coro_init;
277 ctx->sp -= NUM_SAVED;
278
279# elif CORO_UCONTEXT
280
281 getcontext (&(ctx->uc));
282
283 ctx->uc.uc_link = 0;
284 ctx->uc.uc_stack.ss_sp = sptr;
285 ctx->uc.uc_stack.ss_size = (size_t)ssize;
286 ctx->uc.uc_stack.ss_flags = 0;
287
288 makecontext (&(ctx->uc), (void (*)())coro_init, 0);
289
290# endif
291
292 coro_transfer (create_coro, new_coro);
293}
294
295/*****************************************************************************/
296/* pthread backend */
297/*****************************************************************************/
298#elif CORO_PTHREAD
299
300/* this mutex will be locked by the running coroutine */
301pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
302
303struct coro_init_args
304{
305 coro_func func;
306 void *arg;
307 coro_context *self, *main;
308};
309
310static pthread_t null_tid;
311
312/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */
313static void
314mutex_unlock_wrapper (void *arg)
315{
316 pthread_mutex_unlock ((pthread_mutex_t *)arg);
317}
318
319static void *
320coro_init (void *args_)
321{
322 struct coro_init_args *args = (struct coro_init_args *)args_;
323 coro_func func = args->func;
324 void *arg = args->arg;
325
326 pthread_mutex_lock (&coro_mutex);
327
328 /* we try to be good citizens and use deferred cancellation and cleanup handlers */
329 pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex);
330 coro_transfer (args->self, args->main);
331 func (arg);
332 pthread_cleanup_pop (1);
333
334 return 0;
335}
336
337void
338coro_transfer (coro_context *prev, coro_context *next)
339{
340 pthread_cond_signal (&next->cv);
341 pthread_cond_wait (&prev->cv, &coro_mutex);
342#if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */
343 pthread_testcancel ();
344#endif
345}
346
347void
348coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
349{
350 static coro_context nctx;
351 static int once;
352
353 if (!once)
354 {
355 once = 1;
356
357 pthread_mutex_lock (&coro_mutex);
358 pthread_cond_init (&nctx.cv, 0);
359 null_tid = pthread_self ();
360 }
361
362 pthread_cond_init (&ctx->cv, 0);
363
364 if (coro)
365 {
366 pthread_attr_t attr;
367 struct coro_init_args args;
368
369 args.func = coro;
370 args.arg = arg;
371 args.self = ctx;
372 args.main = &nctx;
373
374 pthread_attr_init (&attr);
375 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
376 pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
377 pthread_create (&ctx->id, &attr, coro_init, &args);
378
379 coro_transfer (args.main, args.self);
380 }
381 else
382 ctx->id = null_tid;
383}
384
385void
386coro_destroy (coro_context *ctx)
387{
388 if (!pthread_equal (ctx->id, null_tid))
389 {
390 pthread_cancel (ctx->id);
391 pthread_mutex_unlock (&coro_mutex);
392 pthread_join (ctx->id, 0);
393 pthread_mutex_lock (&coro_mutex);
394 }
395
396 pthread_cond_destroy (&ctx->cv);
397}
398
174#else 399#else
175#error "Unsupported Linux (g)libc version and/or platform" 400# error unsupported backend
176#endif 401#endif
177 402
178# endif
179
180 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
181
182#else
183error unsupported architecture
184#endif
185}
186

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