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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 1.38 by root, Fri Nov 7 20:12:26 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#if !defined(STACK_ADJUST_PTR)
46/* IRIX is decidedly NON-unix */
47# if __sgi
48# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
49# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8)
50# elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER)
51# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss))
52# define STACK_ADJUST_SIZE(sp,ss) (ss)
53# elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER)
54# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
55# define STACK_ADJUST_SIZE(sp,ss) (ss)
56# else
57# define STACK_ADJUST_PTR(sp,ss) (sp)
58# define STACK_ADJUST_SIZE(sp,ss) (ss)
59# endif
60#endif
61
62#if CORO_UCONTEXT
63# include <stddef.h>
64#endif
65
66#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
67
68# include <stdlib.h>
69
70# if CORO_SJLJ
71# include <stdio.h>
37#include <signal.h> 72# include <signal.h>
73# include <unistd.h>
74# endif
38 75
39static volatile coro_func coro_init_func; 76static volatile coro_func coro_init_func;
40static volatile void *coro_init_arg; 77static volatile void *coro_init_arg;
41static volatile coro_context *new_coro, *create_coro; 78static volatile coro_context *new_coro, *create_coro;
42 79
80/* what we really want to detect here is wether we use a new-enough version of GAS */
81/* instead, check for gcc 3, ELF and GNU/Linux and hope for the best */
82# if __GNUC__ >= 3 && __ELF__ && __linux__
83# define HAVE_CFI 1
84# endif
85
43static void 86static void
44coro_init (void) 87coro_init (void)
45{ 88{
46 volatile coro_func func = coro_init_func; 89 volatile coro_func func = coro_init_func;
47 volatile void *arg = coro_init_arg; 90 volatile void *arg = coro_init_arg;
… …
53 /* the new coro returned. bad. just abort() for now */ 96 /* the new coro returned. bad. just abort() for now */
54 abort (); 97 abort ();
55} 98}
56 99
57# if CORO_SJLJ 100# if CORO_SJLJ
58# define coro_save(ctx) (void)setjmp((ctx)->env)
59 101
60static volatile int trampoline_count; 102static volatile int trampoline_count;
61 103
62/* trampoline signal handler */ 104/* trampoline signal handler */
63static void 105static void
64trampoline(int sig) 106trampoline (int sig)
65{ 107{
66 if (setjmp (((coro_context *)new_coro)->env)) 108 if (setjmp (((coro_context *)new_coro)->env))
109 {
110# if HAVE_CFI
111 asm (".cfi_startproc");
112# endif
67 coro_init (); /* start it */ 113 coro_init (); /* start it */
114# if HAVE_CFI
115 asm (".cfi_endproc");
116# endif
117 }
68 else 118 else
69 trampoline_count++; 119 trampoline_count++;
70} 120}
71 121
72# endif 122# endif
73 123
74#elif CORO_UCONTEXT 124#endif
75# define coro_save(ctx) getcontext(&((ctx)->uc)) 125
126#if CORO_ASM
127
128 asm (
129 ".text\n"
130 ".globl coro_transfer\n"
131 ".type coro_transfer, @function\n"
132 "coro_transfer:\n"
133# if __amd64
134# define NUM_SAVED 6
135 "\tpush %rbp\n"
136 "\tpush %rbx\n"
137 "\tpush %r12\n"
138 "\tpush %r13\n"
139 "\tpush %r14\n"
140 "\tpush %r15\n"
141 "\tmov %rsp, (%rdi)\n"
142 "\tmov (%rsi), %rsp\n"
143 "\tpop %r15\n"
144 "\tpop %r14\n"
145 "\tpop %r13\n"
146 "\tpop %r12\n"
147 "\tpop %rbx\n"
148 "\tpop %rbp\n"
149# elif __i386
150# define NUM_SAVED 4
151 "\tpush %ebp\n"
152 "\tpush %ebx\n"
153 "\tpush %esi\n"
154 "\tpush %edi\n"
155 "\tmov %esp, (%eax)\n"
156 "\tmov (%edx), %esp\n"
157 "\tpop %edi\n"
158 "\tpop %esi\n"
159 "\tpop %ebx\n"
160 "\tpop %ebp\n"
161# else
162# error unsupported architecture
163# endif
164 "\tret\n"
165 );
166
167#endif
168
169#if CORO_PTHREAD
170
171/* this mutex will be locked by the running coroutine */
172pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
173
174struct coro_init_args
175{
176 coro_func func;
177 void *arg;
178 coro_context *self, *main;
179};
180
181static pthread_t null_tid;
182
183/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */
184static void
185mutex_unlock_wrapper (void *arg)
186{
187 pthread_mutex_unlock ((pthread_mutex_t *)arg);
188}
189
190static void *
191trampoline (void *args_)
192{
193 struct coro_init_args *args = (struct coro_init_args *)args_;
194 coro_func func = args->func;
195 void *arg = args->arg;
196
197 pthread_mutex_lock (&coro_mutex);
198
199 /* we try to be good citizens and use deferred cancellation and cleanup handlers */
200 pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex);
201 coro_transfer (args->self, args->main);
202 func (arg);
203 pthread_cleanup_pop (1);
204
205 return 0;
206}
207
208void
209coro_transfer (coro_context *prev, coro_context *next)
210{
211 pthread_cond_signal (&next->cv);
212 pthread_cond_wait (&prev->cv, &coro_mutex);
213}
214
215void
216coro_destroy (coro_context *ctx)
217{
218 if (!pthread_equal (ctx->id, null_tid))
219 {
220 pthread_cancel (ctx->id);
221 pthread_mutex_unlock (&coro_mutex);
222 pthread_join (ctx->id, 0);
223 pthread_mutex_lock (&coro_mutex);
224 }
225
226 pthread_cond_destroy (&ctx->cv);
227}
228
76#endif 229#endif
77 230
78/* initialize a machine state */ 231/* initialize a machine state */
79void coro_create(coro_context *ctx, 232void
80 coro_func coro, void *arg, 233coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
81 void *sptr, long ssize)
82{ 234{
83#if CORO_UCONTEXT 235#if CORO_UCONTEXT
84 236
237 if (!coro)
238 return;
239
85 getcontext (&(ctx->uc)); 240 getcontext (&(ctx->uc));
86 241
87 ctx->uc.uc_link = 0; 242 ctx->uc.uc_link = 0;
88 ctx->uc.uc_stack.ss_sp = sptr; 243 ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize);
89 ctx->uc.uc_stack.ss_size = (size_t) ssize; 244 ctx->uc.uc_stack.ss_size = (size_t)STACK_ADJUST_SIZE (sptr,ssize);
90 ctx->uc.uc_stack.ss_flags = 0; 245 ctx->uc.uc_stack.ss_flags = 0;
91 246
92 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 247 makecontext (&(ctx->uc), (void (*)())coro, 1, arg);
93 248
94#elif CORO_SJLJ || CORO_LOOSE 249#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
95 250
96# if CORO_SJLJ 251# if CORO_SJLJ
97 stack_t ostk, nstk; 252 stack_t ostk, nstk;
98 struct sigaction osa, nsa; 253 struct sigaction osa, nsa;
99 sigset_t nsig, osig; 254 sigset_t nsig, osig;
100# endif 255# endif
101 coro_context nctx; 256 coro_context nctx;
102 257
258 if (!coro)
259 return;
260
103 coro_init_func = coro; 261 coro_init_func = coro;
104 coro_init_arg = arg; 262 coro_init_arg = arg;
105 263
106 new_coro = ctx; 264 new_coro = ctx;
107 create_coro = &nctx; 265 create_coro = &nctx;
… …
116 nsa.sa_handler = trampoline; 274 nsa.sa_handler = trampoline;
117 sigemptyset (&nsa.sa_mask); 275 sigemptyset (&nsa.sa_mask);
118 nsa.sa_flags = SA_ONSTACK; 276 nsa.sa_flags = SA_ONSTACK;
119 277
120 if (sigaction (SIGUSR2, &nsa, &osa)) 278 if (sigaction (SIGUSR2, &nsa, &osa))
279 {
121 perror ("sigaction"); 280 perror ("sigaction");
281 abort ();
282 }
122 283
123 /* set the new stack */ 284 /* set the new stack */
124 nstk.ss_sp = sptr; 285 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
125 nstk.ss_size = ssize; 286 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
126 nstk.ss_flags = 0; 287 nstk.ss_flags = 0;
127 288
128 if (sigaltstack (&nstk, &ostk) < 0) 289 if (sigaltstack (&nstk, &ostk) < 0)
290 {
129 perror ("sigaltstack"); 291 perror ("sigaltstack");
292 abort ();
293 }
130 294
131 trampoline_count = 0; 295 trampoline_count = 0;
132 kill (getpid (), SIGUSR2); 296 kill (getpid (), SIGUSR2);
133 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 297 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
134 298
… …
145 abort (); 309 abort ();
146 310
147 if (~ostk.ss_flags & SS_DISABLE) 311 if (~ostk.ss_flags & SS_DISABLE)
148 sigaltstack (&ostk, 0); 312 sigaltstack (&ostk, 0);
149 313
150 sigaction (SIGUSR1, &osa, 0); 314 sigaction (SIGUSR2, &osa, 0);
151 315
152 sigprocmask (SIG_SETMASK, &osig, 0); 316 sigprocmask (SIG_SETMASK, &osig, 0);
153 317
154# elif MS_LOOSE 318# elif CORO_LOSER
155 319
156 coro_save (ctx); 320 setjmp (ctx->env);
321#if __CYGWIN__
157 ctx->env[7] = (int)((char *)sptr + ssize); 322 ctx->env[7] = (long)((char *)sptr + ssize) - sizeof (long);
158 ctx->env[8] = (int)coro; 323 ctx->env[8] = (long)coro_init;
324#elif defined(_M_IX86)
325 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
326 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
327#elif defined(_M_AMD64)
328 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
329 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
330#elif defined(_M_IA64)
331 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
332 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
333#else
334# error "microsoft libc or architecture not supported"
335#endif
336
337# elif CORO_LINUX
338
339 _setjmp (ctx->env);
340#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
341 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
342 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
343#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
344 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
345 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize) - sizeof (long);
346#elif defined (__GNU_LIBRARY__) && defined (__i386__)
347 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
348 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
349#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
350 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
351 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
352#else
353# error "linux libc or architecture not supported"
354#endif
355
356# elif CORO_IRIX
357
358 setjmp (ctx->env);
359 ctx->env[JB_PC] = (__uint64_t)coro_init;
360 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
361
362# elif CORO_ASM
363
364 ctx->sp = (volatile void **)(ssize + (char *)sptr);
365 *--ctx->sp = (void *)abort; /* needed for alignment only */
366 *--ctx->sp = (void *)coro_init;
367 ctx->sp -= NUM_SAVED;
159 368
160# endif 369# endif
161 370
162 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); 371 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
163 372
373# elif CORO_PTHREAD
374
375 static coro_context nctx;
376 static int once;
377
378 if (!once)
379 {
380 once = 1;
381
382 pthread_mutex_lock (&coro_mutex);
383 pthread_cond_init (&nctx.cv, 0);
384 null_tid = pthread_self ();
385 }
386
387 pthread_cond_init (&ctx->cv, 0);
388
389 if (coro)
390 {
391 pthread_attr_t attr;
392 struct coro_init_args args;
393
394 args.func = coro;
395 args.arg = arg;
396 args.self = ctx;
397 args.main = &nctx;
398
399 pthread_attr_init (&attr);
400 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
401 pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
402 pthread_create (&ctx->id, &attr, trampoline, &args);
403
404 coro_transfer (args.main, args.self);
405 }
406 else
407 ctx->id = null_tid;
408
164#else 409#else
165error unsupported architecture 410# error unsupported backend
166#endif 411#endif
167} 412}
168 413

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