ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/libcoro/coro.c
(Generate patch)

Comparing libcoro/coro.c (file contents):
Revision 1.3 by root, Mon Jul 23 22:16:38 2001 UTC vs.
Revision 1.35 by root, Mon Nov 3 16:05:38 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#if !defined(STACK_ADJUST_PTR)
44/* IRIX is decidedly NON-unix */
45# if __sgi
46# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
47# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8)
48# elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER)
49# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss))
50# define STACK_ADJUST_SIZE(sp,ss) (ss)
51# elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER)
52# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
53# define STACK_ADJUST_SIZE(sp,ss) (ss)
54# else
55# define STACK_ADJUST_PTR(sp,ss) (sp)
56# define STACK_ADJUST_SIZE(sp,ss) (ss)
57# endif
58#endif
36 59
60#if CORO_UCONTEXT
61# include <stddef.h>
62#endif
63
64#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
65
66#include <stdlib.h>
67
68#if CORO_SJLJ
69# include <stdio.h>
37#include <signal.h> 70# include <signal.h>
71# include <unistd.h>
72#endif
38 73
39static volatile coro_func coro_init_func; 74static volatile coro_func coro_init_func;
40static volatile void *coro_init_arg; 75static volatile void *coro_init_arg;
41static volatile coro_context *new_coro, *create_coro; 76static volatile coro_context *new_coro, *create_coro;
42 77
78/* what we really want to detect here is wether we use a new-enough version of GAS */
79/* instead, check for gcc 3, ELF and GNU/Linux and hope for the best */
80#if __GNUC__ >= 3 && __ELF__ && __linux__
81# define HAVE_CFI 1
82#endif
83
43static void 84static void
44coro_init (void) 85coro_init (void)
45{ 86{
46 volatile coro_func func = coro_init_func; 87 volatile coro_func func = coro_init_func;
47 volatile void *arg = coro_init_arg; 88 volatile void *arg = coro_init_arg;
… …
53 /* the new coro returned. bad. just abort() for now */ 94 /* the new coro returned. bad. just abort() for now */
54 abort (); 95 abort ();
55} 96}
56 97
57# if CORO_SJLJ 98# if CORO_SJLJ
58# define coro_save(ctx) (void)setjmp((ctx)->env)
59 99
60static volatile int trampoline_count; 100static volatile int trampoline_count;
61 101
62/* trampoline signal handler */ 102/* trampoline signal handler */
63static void 103static void
64trampoline(int sig) 104trampoline (int sig)
65{ 105{
66 if (setjmp (((coro_context *)new_coro)->env)) 106 if (setjmp (((coro_context *)new_coro)->env))
107 {
108#if HAVE_CFI
109 asm (".cfi_startproc");
110#endif
67 coro_init (); /* start it */ 111 coro_init (); /* start it */
112#if HAVE_CFI
113 asm (".cfi_endproc");
114#endif
115 }
68 else 116 else
69 trampoline_count++; 117 trampoline_count++;
70} 118}
71 119
72# endif 120# endif
73 121
74#elif CORO_UCONTEXT 122#endif
75# define coro_save(ctx) getcontext(&((ctx)->uc)) 123
124#if CORO_ASM
125asm (
126 ".text\n"
127 ".globl coro_transfer\n"
128 ".type coro_transfer, @function\n"
129 "coro_transfer:\n"
130#if __amd64
131# define NUM_SAVED 5
132 "\tpush %rbx\n"
133 "\tpush %r12\n"
134 "\tpush %r13\n"
135 "\tpush %r14\n"
136 "\tpush %r15\n"
137 "\tmov %rsp, (%rdi)\n"
138 "\tmov (%rsi), %rsp\n"
139 "\tpop %r15\n"
140 "\tpop %r14\n"
141 "\tpop %r13\n"
142 "\tpop %r12\n"
143 "\tpop %rbx\n"
144#elif __i386
145# define NUM_SAVED 4
146 "\tpush %ebx\n"
147 "\tpush %esi\n"
148 "\tpush %edi\n"
149 "\tpush %ebp\n"
150 "\tmov %esp, (%eax)\n"
151 "\tmov (%edx), %esp\n"
152 "\tpop %ebp\n"
153 "\tpop %edi\n"
154 "\tpop %esi\n"
155 "\tpop %ebx\n"
156#else
157# error unsupported architecture
158#endif
159 "\tret\n"
160);
161#endif
162
163#if CORO_PTHREAD
164
165struct coro_init_args {
166 coro_func func;
167 void *arg;
168 coro_context *self, *main;
169};
170
171pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
172
173static void *
174trampoline (void *args_)
175{
176 struct coro_init_args *args = (struct coro_init_args *)args_;
177 coro_func func = args->func;
178 void *arg = args->arg;
179
180 pthread_mutex_lock (&coro_mutex);
181 pthread_cond_destroy (&args->self->c);
182 coro_transfer (args->self, args->main);
183 func (arg);
184 pthread_mutex_unlock (&coro_mutex);
185
186 return 0;
187}
188
189asm("");
190
191void coro_transfer(coro_context *prev, coro_context *next)
192{
193 pthread_cond_init (&prev->c, 0);
194 pthread_cond_signal (&next->c);
195 pthread_cond_wait (&prev->c, &coro_mutex);
196 pthread_cond_destroy (&prev->c);
197}
198
76#endif 199#endif
77 200
78/* initialize a machine state */ 201/* initialize a machine state */
79void coro_create(coro_context *ctx, 202void coro_create (coro_context *ctx,
80 coro_func coro, void *arg, 203 coro_func coro, void *arg,
81 void *sptr, long ssize) 204 void *sptr, long ssize)
82{ 205{
83#if CORO_UCONTEXT 206#if CORO_UCONTEXT
84 207
85 getcontext (&(ctx->uc)); 208 getcontext (&(ctx->uc));
86 209
87 ctx->uc.uc_link = 0; 210 ctx->uc.uc_link = 0;
88 ctx->uc.uc_stack.ss_sp = sptr; 211 ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize);
89 ctx->uc.uc_stack.ss_size = (size_t) ssize; 212 ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize);
90 ctx->uc.uc_stack.ss_flags = 0; 213 ctx->uc.uc_stack.ss_flags = 0;
91 214
92 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 215 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg);
93 216
94#elif CORO_SJLJ || CORO_LOOSE 217#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
95 218
96# if CORO_SJLJ 219# if CORO_SJLJ
97 stack_t ostk, nstk; 220 stack_t ostk, nstk;
98 struct sigaction osa, nsa; 221 struct sigaction osa, nsa;
99 sigset_t nsig, osig; 222 sigset_t nsig, osig;
… …
116 nsa.sa_handler = trampoline; 239 nsa.sa_handler = trampoline;
117 sigemptyset (&nsa.sa_mask); 240 sigemptyset (&nsa.sa_mask);
118 nsa.sa_flags = SA_ONSTACK; 241 nsa.sa_flags = SA_ONSTACK;
119 242
120 if (sigaction (SIGUSR2, &nsa, &osa)) 243 if (sigaction (SIGUSR2, &nsa, &osa))
244 {
121 perror ("sigaction"); 245 perror ("sigaction");
246 abort ();
247 }
122 248
123 /* set the new stack */ 249 /* set the new stack */
124 nstk.ss_sp = sptr; 250 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
125 nstk.ss_size = ssize; 251 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
126 nstk.ss_flags = 0; 252 nstk.ss_flags = 0;
127 253
128 if (sigaltstack (&nstk, &ostk) < 0) 254 if (sigaltstack (&nstk, &ostk) < 0)
255 {
129 perror ("sigaltstack"); 256 perror ("sigaltstack");
257 abort ();
258 }
130 259
131 trampoline_count = 0; 260 trampoline_count = 0;
132 kill (getpid (), SIGUSR2); 261 kill (getpid (), SIGUSR2);
133 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 262 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
134 263
… …
145 abort (); 274 abort ();
146 275
147 if (~ostk.ss_flags & SS_DISABLE) 276 if (~ostk.ss_flags & SS_DISABLE)
148 sigaltstack (&ostk, 0); 277 sigaltstack (&ostk, 0);
149 278
150 sigaction (SIGUSR1, &osa, 0); 279 sigaction (SIGUSR2, &osa, 0);
151 280
152 sigprocmask (SIG_SETMASK, &osig, 0); 281 sigprocmask (SIG_SETMASK, &osig, 0);
153 282
154# elif MS_LOOSE 283# elif CORO_LOSER
155 284
156 coro_save (ctx); 285 setjmp (ctx->env);
286#if __CYGWIN__
157 ctx->env[7] = (int)((char *)sptr + ssize); 287 ctx->env[7] = (long)((char *)sptr + ssize);
158 ctx->env[8] = (int)coro; 288 ctx->env[8] = (long)coro_init;
289#elif defined(_M_IX86)
290 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
291 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize);
292#elif defined(_M_AMD64)
293 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
294 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize);
295#elif defined(_M_IA64)
296 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
297 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize);
298#else
299# error "microsoft libc or architecture not supported"
300#endif
301
302# elif CORO_LINUX
303
304 _setjmp (ctx->env);
305#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
306 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
307 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize);
308#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
309 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
310 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize);
311#elif defined (__GNU_LIBRARY__) && defined (__i386__)
312 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
313 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize);
314#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
315 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
316 ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize);
317#else
318# error "linux libc or architecture not supported"
319#endif
320
321# elif CORO_IRIX
322
323 setjmp (ctx->env);
324 ctx->env[JB_PC] = (__uint64_t)coro_init;
325 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize);
326
327# elif CORO_ASM
328
329 ctx->sp = (volatile void **)(ssize + (char *)sptr);
330 /* we try to allow for both functions with and without frame pointers */
331 *--ctx->sp = (void *)coro_init;
332 {
333 int i;
334 for (i = NUM_SAVED; i--; )
335 *--ctx->sp = 0;
336 }
159 337
160# endif 338# endif
161 339
162 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); 340 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
163 341
342# elif CORO_PTHREAD
343
344 pthread_t id;
345 pthread_attr_t attr;
346 coro_context nctx;
347 struct coro_init_args args;
348 static int once;
349
350 if (!once)
351 {
352 pthread_mutex_lock (&coro_mutex);
353 once = 1;
354 }
355
356 args.func = coro;
357 args.arg = arg;
358 args.self = ctx;
359 args.main = &nctx;
360
361 pthread_attr_init (&attr);
362 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
363 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
364 pthread_create (&id, &attr, trampoline, &args);
365
366 pthread_cond_init (&args.self->c, 0);
367 coro_transfer (args.main, args.self);
368
164#else 369#else
165error unsupported architecture 370# error unsupported backend
166#endif 371#endif
167} 372}
168 373

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines