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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 1.58 by root, Fri Jun 10 12:27:02 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);
50 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
95
51 func (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 #define NUM_SAVED 8
130 "\tpush %rsi\n"
131 "\tpush %rdi\n"
132 "\tpush %rbp\n"
133 "\tpush %rbx\n"
134 "\tpush %r12\n"
135 "\tpush %r13\n"
136 "\tpush %r14\n"
137 "\tpush %r15\n"
138 #if CORO_WIN_TIB
139 "\tpush %gs:0x0\n"
140 "\tpush %gs:0x8\n"
141 "\tpush %gs:0xc\n"
142 #endif
143 "\tmov %rsp, (%rcx)\n"
144 "\tmov (%rdx), %rsp\n"
145 #if CORO_WIN_TIB
146 "\tpop %gs:0xc\n"
147 "\tpop %gs:0x8\n"
148 "\tpop %gs:0x0\n"
149 #endif
150 "\tpop %r15\n"
151 "\tpop %r14\n"
152 "\tpop %r13\n"
153 "\tpop %r12\n"
154 "\tpop %rbx\n"
155 "\tpop %rbp\n"
156 "\tpop %rdi\n"
157 "\tpop %rsi\n"
158 #else
159 #define NUM_SAVED 6
160 "\tpush %rbp\n"
161 "\tpush %rbx\n"
162 "\tpush %r12\n"
163 "\tpush %r13\n"
164 "\tpush %r14\n"
165 "\tpush %r15\n"
166 "\tmov %rsp, (%rdi)\n"
167 "\tmov (%rsi), %rsp\n"
168 "\tpop %r15\n"
169 "\tpop %r14\n"
170 "\tpop %r13\n"
171 "\tpop %r12\n"
172 "\tpop %rbx\n"
173 "\tpop %rbp\n"
174 #endif
175 #elif __i386
176 #define NUM_SAVED 4
177 "\tpush %ebp\n"
178 "\tpush %ebx\n"
179 "\tpush %esi\n"
180 "\tpush %edi\n"
181 #if CORO_WIN_TIB
182 "\tpush %fs:0\n"
183 "\tpush %fs:4\n"
184 "\tpush %fs:8\n"
185 #endif
186 "\tmov %esp, (%eax)\n"
187 "\tmov (%edx), %esp\n"
188 #if CORO_WIN_TIB
189 "\tpop %fs:8\n"
190 "\tpop %fs:4\n"
191 "\tpop %fs:0\n"
192 #endif
193 "\tpop %edi\n"
194 "\tpop %esi\n"
195 "\tpop %ebx\n"
196 "\tpop %ebp\n"
197 #else
198 #error unsupported architecture
199 #endif
200 "\tret\n"
201 );
86 202
87 ctx->uc.uc_link = 0; 203# 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;
91 204
92 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 205void
93 206coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
94#elif CORO_SJLJ || CORO_LOOSE 207{
95 208 coro_context nctx;
96# if CORO_SJLJ 209# if CORO_SJLJ
97 stack_t ostk, nstk; 210 stack_t ostk, nstk;
98 struct sigaction osa, nsa; 211 struct sigaction osa, nsa;
99 sigset_t nsig, osig; 212 sigset_t nsig, osig;
100# endif 213# endif
101 coro_context nctx; 214
215 if (!coro)
216 return;
102 217
103 coro_init_func = coro; 218 coro_init_func = coro;
104 coro_init_arg = arg; 219 coro_init_arg = arg;
105 220
106 new_coro = ctx; 221 new_coro = ctx;
… …
116 nsa.sa_handler = trampoline; 231 nsa.sa_handler = trampoline;
117 sigemptyset (&nsa.sa_mask); 232 sigemptyset (&nsa.sa_mask);
118 nsa.sa_flags = SA_ONSTACK; 233 nsa.sa_flags = SA_ONSTACK;
119 234
120 if (sigaction (SIGUSR2, &nsa, &osa)) 235 if (sigaction (SIGUSR2, &nsa, &osa))
236 {
121 perror ("sigaction"); 237 perror ("sigaction");
238 abort ();
239 }
122 240
123 /* set the new stack */ 241 /* set the new stack */
124 nstk.ss_sp = sptr; 242 nstk.ss_sp = STACK_ADJUST_PTR (sptr, ssize); /* yes, some platforms (IRIX) get this wrong. */
125 nstk.ss_size = ssize; 243 nstk.ss_size = STACK_ADJUST_SIZE (sptr, ssize);
126 nstk.ss_flags = 0; 244 nstk.ss_flags = 0;
127 245
128 if (sigaltstack (&nstk, &ostk) < 0) 246 if (sigaltstack (&nstk, &ostk) < 0)
247 {
129 perror ("sigaltstack"); 248 perror ("sigaltstack");
249 abort ();
250 }
130 251
131 trampoline_count = 0; 252 trampoline_done = 0;
132 kill (getpid (), SIGUSR2); 253 kill (getpid (), SIGUSR2);
133 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 254 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
134 255
135 while (!trampoline_count) 256 while (!trampoline_done)
136 sigsuspend (&nsig); 257 sigsuspend (&nsig);
137 258
138 sigaltstack (0, &nstk); 259 sigaltstack (0, &nstk);
139 nstk.ss_flags = SS_DISABLE; 260 nstk.ss_flags = SS_DISABLE;
140 if (sigaltstack (&nstk, 0) < 0) 261 if (sigaltstack (&nstk, 0) < 0)
… …
145 abort (); 266 abort ();
146 267
147 if (~ostk.ss_flags & SS_DISABLE) 268 if (~ostk.ss_flags & SS_DISABLE)
148 sigaltstack (&ostk, 0); 269 sigaltstack (&ostk, 0);
149 270
150 sigaction (SIGUSR1, &osa, 0); 271 sigaction (SIGUSR2, &osa, 0);
151
152 sigprocmask (SIG_SETMASK, &osig, 0); 272 sigprocmask (SIG_SETMASK, &osig, 0);
153 273
154# elif MS_LOOSE 274# elif CORO_LOSER
155 275
156 coro_save (ctx); 276 coro_setjmp (ctx->env);
157 ctx->env[7] = (int)((char *)sptr + ssize); 277 #if __CYGWIN__ && __i386
158 ctx->env[8] = (int)coro; 278 ctx->env[8] = (long) coro_init;
279 ctx->env[7] = (long) ((char *)sptr + ssize) - sizeof (long);
280 #elif __CYGWIN__ && __x86_64
281 ctx->env[7] = (long) coro_init;
282 ctx->env[6] = (long) ((char *)sptr + ssize) - sizeof (long);
283 #elif defined(__MINGW32__)
284 ctx->env[5] = (long) coro_init;
285 ctx->env[4] = (long) ((char *)sptr + ssize) - sizeof (long);
286 #elif defined(_M_IX86)
287 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long) coro_init;
288 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
289 #elif defined(_M_AMD64)
290 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64) coro_init;
291 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64);
292 #elif defined(_M_IA64)
293 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64) coro_init;
294 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64);
295 #else
296 #error "microsoft libc or architecture not supported"
297 #endif
159 298
299# elif CORO_LINUX
300
301 coro_setjmp (ctx->env);
302 #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
303 ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init;
304 ctx->env[0].__jmpbuf[JB_SP] = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
305 #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
306 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
307 ctx->env[0].__jmpbuf[0].__sp = (int *) ((char *)sptr + ssize) - sizeof (long);
308 #elif defined (__GNU_LIBRARY__) && defined (__i386__)
309 ctx->env[0].__jmpbuf[0].__pc = (char *) coro_init;
310 ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long);
311 #elif defined (__GNU_LIBRARY__) && defined (__amd64__)
312 ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init;
313 ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long);
314 #else
315 #error "linux libc or architecture not supported"
316 #endif
317
318# elif CORO_IRIX
319
320 coro_setjmp (ctx->env, 0);
321 ctx->env[JB_PC] = (__uint64_t)coro_init;
322 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
323
324# elif CORO_ASM
325
326 ctx->sp = (void **)(ssize + (char *)sptr);
327 *--ctx->sp = (void *)abort; /* needed for alignment only */
328 *--ctx->sp = (void *)coro_init;
329
330 #if CORO_WIN_TIB
331 *--ctx->sp = 0; /* ExceptionList */
332 *--ctx->sp = (char *)sptr + ssize; /* StackBase */
333 *--ctx->sp = sptr; /* StackLimit */
334 #endif
335
336 ctx->sp -= NUM_SAVED;
337 memset (ctx->sp, 0, sizeof (*ctx->sp) * NUM_SAVED);
338
339# elif CORO_UCONTEXT
340
341 getcontext (&(ctx->uc));
342
343 ctx->uc.uc_link = 0;
344 ctx->uc.uc_stack.ss_sp = sptr;
345 ctx->uc.uc_stack.ss_size = (size_t)ssize;
346 ctx->uc.uc_stack.ss_flags = 0;
347
348 makecontext (&(ctx->uc), (void (*)())coro_init, 0);
349
350# endif
351
352 coro_transfer (create_coro, new_coro);
353}
354
355/*****************************************************************************/
356/* pthread backend */
357/*****************************************************************************/
358#elif CORO_PTHREAD
359
360/* this mutex will be locked by the running coroutine */
361pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
362
363struct coro_init_args
364{
365 coro_func func;
366 void *arg;
367 coro_context *self, *main;
368};
369
370static pthread_t null_tid;
371
372/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */
373static void
374mutex_unlock_wrapper (void *arg)
375{
376 pthread_mutex_unlock ((pthread_mutex_t *)arg);
377}
378
379static void *
380coro_init (void *args_)
381{
382 struct coro_init_args *args = (struct coro_init_args *)args_;
383 coro_func func = args->func;
384 void *arg = args->arg;
385
386 pthread_mutex_lock (&coro_mutex);
387
388 /* we try to be good citizens and use deferred cancellation and cleanup handlers */
389 pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex);
390 coro_transfer (args->self, args->main);
391 func (arg);
392 pthread_cleanup_pop (1);
393
394 return 0;
395}
396
397void
398coro_transfer (coro_context *prev, coro_context *next)
399{
400 pthread_cond_signal (&next->cv);
401 pthread_cond_wait (&prev->cv, &coro_mutex);
402#if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */
403 pthread_testcancel ();
160# endif 404#endif
405}
161 406
162 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); 407void
408coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
409{
410 static coro_context nctx;
411 static int once;
163 412
413 if (!once)
414 {
415 once = 1;
416
417 pthread_mutex_lock (&coro_mutex);
418 pthread_cond_init (&nctx.cv, 0);
419 null_tid = pthread_self ();
420 }
421
422 pthread_cond_init (&ctx->cv, 0);
423
424 if (coro)
425 {
426 pthread_attr_t attr;
427 struct coro_init_args args;
428
429 args.func = coro;
430 args.arg = arg;
431 args.self = ctx;
432 args.main = &nctx;
433
434 pthread_attr_init (&attr);
435#if __UCLIBC__
436 /* exists, but is borked */
437 /*pthread_attr_setstacksize (&attr, (size_t)ssize);*/
164#else 438#else
165error unsupported architecture 439 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
166#endif 440#endif
167} 441 pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
442 pthread_create (&ctx->id, &attr, coro_init, &args);
168 443
444 coro_transfer (args.main, args.self);
445 }
446 else
447 ctx->id = null_tid;
448}
449
450void
451coro_destroy (coro_context *ctx)
452{
453 if (!pthread_equal (ctx->id, null_tid))
454 {
455 pthread_cancel (ctx->id);
456 pthread_mutex_unlock (&coro_mutex);
457 pthread_join (ctx->id, 0);
458 pthread_mutex_lock (&coro_mutex);
459 }
460
461 pthread_cond_destroy (&ctx->cv);
462}
463
464#else
465# error unsupported backend
466#endif
467

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