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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 1.59 by root, Mon Jun 13 08:38:16 2011 UTC

1/* 1/*
2 * Copyright (c) 2001 Marc Alexander Lehmann <pcg@goof.com> 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 *
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);
90
91#if __linux && __amd64
92 /* we blindly assume on any __linux with __amd64 we have a new enough gas with .cfi_undefined support */
93 asm (".cfi_undefined rip");
94#endif
50 95
51 func ((void *)arg); 96 func ((void *)arg);
52 97
53 /* the new coro returned. bad. just abort() for now */ 98 /* the new coro returned. bad. just abort() for now */
54 abort (); 99 abort ();
55} 100}
56 101
57# if CORO_SJLJ 102# if CORO_SJLJ
58# define coro_save(ctx) (void)setjmp((ctx)->env)
59 103
60static volatile int trampoline_count; 104static volatile int trampoline_done;
61 105
62/* trampoline signal handler */ 106/* trampoline signal handler */
63static void 107static void
64trampoline(int sig) 108trampoline (int sig)
65{ 109{
66 if (setjmp (((coro_context *)new_coro)->env)) 110 if (coro_setjmp (new_coro->env))
67 coro_init (); /* start it */ 111 coro_init (); /* start it */
68 else 112 else
69 trampoline_count++; 113 trampoline_done = 1;
70} 114}
71 115
72# endif
73
74#elif CORO_UCONTEXT
75# define coro_save(ctx) getcontext(&((ctx)->uc))
76#endif 116# endif
77 117
78/* initialize a machine state */ 118# 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
84 119
85 getcontext (&(ctx->uc)); 120 asm (
121 ".text\n"
122 ".globl coro_transfer\n"
123 ".type coro_transfer, @function\n"
124 "coro_transfer:\n"
125 /* windows, of course, gives a shit on the amd64 ABI and uses different registers */
126 /* http://blogs.msdn.com/freik/archive/2005/03/17/398200.aspx */
127 #if __amd64
128 #ifdef _WIN32
129 /* TODO: xmm6..15 also would need to be saved. sigh. */
130 #define NUM_SAVED 8
131 #undef CORO_WIN_TIB
132 "\tpushq %rsi\n"
133 "\tpushq %rdi\n"
134 "\tpushq %rbp\n"
135 "\tpushq %rbx\n"
136 "\tpushq %r12\n"
137 "\tpushq %r13\n"
138 "\tpushq %r14\n"
139 "\tpushq %r15\n"
140 "\tmovq %rsp, (%rcx)\n"
141 "\tmovq (%rdx), %rsp\n"
142 "\tpopq %r15\n"
143 "\tpopq %r14\n"
144 "\tpopq %r13\n"
145 "\tpopq %r12\n"
146 "\tpopq %rbx\n"
147 "\tpopq %rbp\n"
148 "\tpopq %rdi\n"
149 "\tpopq %rsi\n"
150 #else
151 #define NUM_SAVED 6
152 "\tpushq %rbp\n"
153 "\tpushq %rbx\n"
154 "\tpushq %r12\n"
155 "\tpushq %r13\n"
156 "\tpushq %r14\n"
157 "\tpushq %r15\n"
158 "\tmovq %rsp, (%rdi)\n"
159 "\tmovq (%rsi), %rsp\n"
160 "\tpopq %r15\n"
161 "\tpopq %r14\n"
162 "\tpopq %r13\n"
163 "\tpopq %r12\n"
164 "\tpopq %rbx\n"
165 "\tpopq %rbp\n"
166 #endif
167 #elif __i386
168 #define NUM_SAVED 4
169 "\tpushl %ebp\n"
170 "\tpushl %ebx\n"
171 "\tpushl %esi\n"
172 "\tpushl %edi\n"
173 #if CORO_WIN_TIB
174 "\tpushl %fs:0\n"
175 "\tpushl %fs:4\n"
176 "\tpushl %fs:8\n"
177 #endif
178 "\tmovl %esp, (%eax)\n"
179 "\tmovl (%edx), %esp\n"
180 #if CORO_WIN_TIB
181 "\tpopl %fs:8\n"
182 "\tpopl %fs:4\n"
183 "\tpopl %fs:0\n"
184 #endif
185 "\tpopl %edi\n"
186 "\tpopl %esi\n"
187 "\tpopl %ebx\n"
188 "\tpopl %ebp\n"
189 #else
190 #error unsupported architecture
191 #endif
192 "\tret\n"
193 );
86 194
87 ctx->uc.uc_link = 0; 195# 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;
91 196
92 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 197void
93 198coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
94#elif CORO_SJLJ || CORO_LOOSE 199{
95 200 coro_context nctx;
96# if CORO_SJLJ 201# if CORO_SJLJ
97 stack_t ostk, nstk; 202 stack_t ostk, nstk;
98 struct sigaction osa, nsa; 203 struct sigaction osa, nsa;
99 sigset_t nsig, osig; 204 sigset_t nsig, osig;
100# endif 205# endif
101 coro_context nctx; 206
207 if (!coro)
208 return;
102 209
103 coro_init_func = coro; 210 coro_init_func = coro;
104 coro_init_arg = arg; 211 coro_init_arg = arg;
105 212
106 new_coro = ctx; 213 new_coro = ctx;
… …
116 nsa.sa_handler = trampoline; 223 nsa.sa_handler = trampoline;
117 sigemptyset (&nsa.sa_mask); 224 sigemptyset (&nsa.sa_mask);
118 nsa.sa_flags = SA_ONSTACK; 225 nsa.sa_flags = SA_ONSTACK;
119 226
120 if (sigaction (SIGUSR2, &nsa, &osa)) 227 if (sigaction (SIGUSR2, &nsa, &osa))
228 {
121 perror ("sigaction"); 229 perror ("sigaction");
230 abort ();
231 }
122 232
123 /* set the new stack */ 233 /* set the new stack */
124 nstk.ss_sp = sptr; 234 nstk.ss_sp = STACK_ADJUST_PTR (sptr, ssize); /* yes, some platforms (IRIX) get this wrong. */
125 nstk.ss_size = ssize; 235 nstk.ss_size = STACK_ADJUST_SIZE (sptr, ssize);
126 nstk.ss_flags = 0; 236 nstk.ss_flags = 0;
127 237
128 if (sigaltstack (&nstk, &ostk) < 0) 238 if (sigaltstack (&nstk, &ostk) < 0)
239 {
129 perror ("sigaltstack"); 240 perror ("sigaltstack");
241 abort ();
242 }
130 243
131 trampoline_count = 0; 244 trampoline_done = 0;
132 kill (getpid (), SIGUSR2); 245 kill (getpid (), SIGUSR2);
133 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 246 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
134 247
135 while (!trampoline_count) 248 while (!trampoline_done)
136 sigsuspend (&nsig); 249 sigsuspend (&nsig);
137 250
138 sigaltstack (0, &nstk); 251 sigaltstack (0, &nstk);
139 nstk.ss_flags = SS_DISABLE; 252 nstk.ss_flags = SS_DISABLE;
140 if (sigaltstack (&nstk, 0) < 0) 253 if (sigaltstack (&nstk, 0) < 0)
… …
145 abort (); 258 abort ();
146 259
147 if (~ostk.ss_flags & SS_DISABLE) 260 if (~ostk.ss_flags & SS_DISABLE)
148 sigaltstack (&ostk, 0); 261 sigaltstack (&ostk, 0);
149 262
150 sigaction (SIGUSR1, &osa, 0); 263 sigaction (SIGUSR2, &osa, 0);
151
152 sigprocmask (SIG_SETMASK, &osig, 0); 264 sigprocmask (SIG_SETMASK, &osig, 0);
153 265
154# elif MS_LOOSE 266# elif CORO_LOSER
155 267
156 coro_save (ctx); 268 coro_setjmp (ctx->env);
157 ctx->env[7] = (int)((char *)sptr + ssize); 269 #if __CYGWIN__ && __i386
158 ctx->env[8] = (int)coro; 270 ctx->env[8] = (long) coro_init;
271 ctx->env[7] = (long) ((char *)sptr + ssize) - sizeof (long);
272 #elif __CYGWIN__ && __x86_64
273 ctx->env[7] = (long) coro_init;
274 ctx->env[6] = (long) ((char *)sptr + ssize) - sizeof (long);
275 #elif defined(__MINGW32__)
276 ctx->env[5] = (long) coro_init;
277 ctx->env[4] = (long) ((char *)sptr + ssize) - sizeof (long);
278 #elif defined(_M_IX86)
279 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long) coro_init;
280 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
281 #elif defined(_M_AMD64)
282 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64) coro_init;
283 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64);
284 #elif defined(_M_IA64)
285 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64) coro_init;
286 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64);
287 #else
288 #error "microsoft libc or architecture not supported"
289 #endif
159 290
291# elif CORO_LINUX
292
293 coro_setjmp (ctx->env);
294 #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
295 ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init;
296 ctx->env[0].__jmpbuf[JB_SP] = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
297 #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
298 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
299 ctx->env[0].__jmpbuf[0].__sp = (int *) ((char *)sptr + ssize) - sizeof (long);
300 #elif defined (__GNU_LIBRARY__) && defined (__i386__)
301 ctx->env[0].__jmpbuf[0].__pc = (char *) coro_init;
302 ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long);
303 #elif defined (__GNU_LIBRARY__) && defined (__amd64__)
304 ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init;
305 ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long);
306 #else
307 #error "linux libc or architecture not supported"
308 #endif
309
310# elif CORO_IRIX
311
312 coro_setjmp (ctx->env, 0);
313 ctx->env[JB_PC] = (__uint64_t)coro_init;
314 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
315
316# elif CORO_ASM
317
318 ctx->sp = (void **)(ssize + (char *)sptr);
319 *--ctx->sp = (void *)abort; /* needed for alignment only */
320 *--ctx->sp = (void *)coro_init;
321
322 #if CORO_WIN_TIB
323 *--ctx->sp = 0; /* ExceptionList */
324 *--ctx->sp = (char *)sptr + ssize; /* StackBase */
325 *--ctx->sp = sptr; /* StackLimit */
326 #endif
327
328 ctx->sp -= NUM_SAVED;
329 memset (ctx->sp, 0, sizeof (*ctx->sp) * NUM_SAVED);
330
331# elif CORO_UCONTEXT
332
333 getcontext (&(ctx->uc));
334
335 ctx->uc.uc_link = 0;
336 ctx->uc.uc_stack.ss_sp = sptr;
337 ctx->uc.uc_stack.ss_size = (size_t)ssize;
338 ctx->uc.uc_stack.ss_flags = 0;
339
340 makecontext (&(ctx->uc), (void (*)())coro_init, 0);
341
342# endif
343
344 coro_transfer (create_coro, new_coro);
345}
346
347/*****************************************************************************/
348/* pthread backend */
349/*****************************************************************************/
350#elif CORO_PTHREAD
351
352/* this mutex will be locked by the running coroutine */
353pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
354
355struct coro_init_args
356{
357 coro_func func;
358 void *arg;
359 coro_context *self, *main;
360};
361
362static pthread_t null_tid;
363
364/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */
365static void
366mutex_unlock_wrapper (void *arg)
367{
368 pthread_mutex_unlock ((pthread_mutex_t *)arg);
369}
370
371static void *
372coro_init (void *args_)
373{
374 struct coro_init_args *args = (struct coro_init_args *)args_;
375 coro_func func = args->func;
376 void *arg = args->arg;
377
378 pthread_mutex_lock (&coro_mutex);
379
380 /* we try to be good citizens and use deferred cancellation and cleanup handlers */
381 pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex);
382 coro_transfer (args->self, args->main);
383 func (arg);
384 pthread_cleanup_pop (1);
385
386 return 0;
387}
388
389void
390coro_transfer (coro_context *prev, coro_context *next)
391{
392 pthread_cond_signal (&next->cv);
393 pthread_cond_wait (&prev->cv, &coro_mutex);
394#if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */
395 pthread_testcancel ();
160# endif 396#endif
397}
161 398
162 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); 399void
400coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
401{
402 static coro_context nctx;
403 static int once;
163 404
405 if (!once)
406 {
407 once = 1;
408
409 pthread_mutex_lock (&coro_mutex);
410 pthread_cond_init (&nctx.cv, 0);
411 null_tid = pthread_self ();
412 }
413
414 pthread_cond_init (&ctx->cv, 0);
415
416 if (coro)
417 {
418 pthread_attr_t attr;
419 struct coro_init_args args;
420
421 args.func = coro;
422 args.arg = arg;
423 args.self = ctx;
424 args.main = &nctx;
425
426 pthread_attr_init (&attr);
427#if __UCLIBC__
428 /* exists, but is borked */
429 /*pthread_attr_setstacksize (&attr, (size_t)ssize);*/
164#else 430#else
165error unsupported architecture 431 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
166#endif 432#endif
167} 433 pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
434 pthread_create (&ctx->id, &attr, coro_init, &args);
168 435
436 coro_transfer (args.main, args.self);
437 }
438 else
439 ctx->id = null_tid;
440}
441
442void
443coro_destroy (coro_context *ctx)
444{
445 if (!pthread_equal (ctx->id, null_tid))
446 {
447 pthread_cancel (ctx->id);
448 pthread_mutex_unlock (&coro_mutex);
449 pthread_join (ctx->id, 0);
450 pthread_mutex_lock (&coro_mutex);
451 }
452
453 pthread_cond_destroy (&ctx->cv);
454}
455
456#else
457# error unsupported backend
458#endif
459

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