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Comparing libcoro/coro.c (file contents):
Revision 1.29 by root, Sun Mar 2 16:10:22 2008 UTC vs.
Revision 1.46 by root, Sat Jul 11 14:24:13 2009 UTC

1/* 1/*
2 * Copyright (c) 2001-2008 Marc Alexander Lehmann <schmorp@schmorp.de> 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,
… …
38 * go to Ralf S. Engelschall <rse@engelschall.com>. 38 * go to Ralf S. Engelschall <rse@engelschall.com>.
39 */ 39 */
40 40
41#include "coro.h" 41#include "coro.h"
42 42
43#include <string.h>
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
43#if !defined(STACK_ADJUST_PTR) 54# if !defined(STACK_ADJUST_PTR)
55# if __sgi
44/* IRIX is decidedly NON-unix */ 56/* IRIX is decidedly NON-unix */
45# if __sgi
46# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) 57# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
47# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8) 58# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8)
48# elif __i386__ && CORO_LINUX 59# elif (__i386__ && CORO_LINUX) || (_M_IX86 && CORO_LOSER)
49# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss)) 60# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss))
50# define STACK_ADJUST_SIZE(sp,ss) (ss) 61# define STACK_ADJUST_SIZE(sp,ss) (ss)
51# elif __amd64__ && CORO_LINUX 62# elif (__amd64__ && CORO_LINUX) || ((_M_AMD64 || _M_IA64) && CORO_LOSER)
52# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) 63# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
53# define STACK_ADJUST_SIZE(sp,ss) (ss) 64# define STACK_ADJUST_SIZE(sp,ss) (ss)
54# else 65# else
55# define STACK_ADJUST_PTR(sp,ss) (sp) 66# define STACK_ADJUST_PTR(sp,ss) (sp)
56# define STACK_ADJUST_SIZE(sp,ss) (ss) 67# define STACK_ADJUST_SIZE(sp,ss) (ss)
57# endif 68# endif
58#endif 69# endif
59 70
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> 71# include <stdlib.h>
67 72
68#if CORO_SJLJ 73# if CORO_SJLJ
69# include <stdio.h> 74# include <stdio.h>
70# include <signal.h> 75# include <signal.h>
71# include <unistd.h> 76# include <unistd.h>
72#endif 77# endif
73 78
74static volatile coro_func coro_init_func; 79static coro_func coro_init_func;
75static volatile void *coro_init_arg; 80static void *coro_init_arg;
76static volatile coro_context *new_coro, *create_coro; 81static coro_context *new_coro, *create_coro;
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 82
84static void 83static void
85coro_init (void) 84coro_init (void)
86{ 85{
87 volatile coro_func func = coro_init_func; 86 volatile coro_func func = coro_init_func;
88 volatile void *arg = coro_init_arg; 87 volatile void *arg = coro_init_arg;
89 88
90 coro_transfer ((coro_context *)new_coro, (coro_context *)create_coro); 89 coro_transfer (new_coro, create_coro);
91 90
92 func ((void *)arg); 91 func ((void *)arg);
93 92
94 /* the new coro returned. bad. just abort() for now */ 93 /* the new coro returned. bad. just abort() for now */
95 abort (); 94 abort ();
96} 95}
97 96
98# if CORO_SJLJ 97# if CORO_SJLJ
99 98
100static volatile int trampoline_count; 99static volatile int trampoline_done;
101 100
102/* trampoline signal handler */ 101/* trampoline signal handler */
103static void 102static void
104trampoline (int sig) 103trampoline (int sig)
105{ 104{
106 if (setjmp (((coro_context *)new_coro)->env)) 105 if (coro_setjmp (new_coro->env))
107 {
108#if HAVE_CFI
109 asm (".cfi_startproc");
110#endif
111 coro_init (); /* start it */ 106 coro_init (); /* start it */
112#if HAVE_CFI
113 asm (".cfi_endproc");
114#endif
115 }
116 else 107 else
117 trampoline_count++; 108 trampoline_done = 1;
118} 109}
119 110
120# endif
121
122#endif 111# endif
123 112
124#if CORO_ASM 113# if CORO_ASM
125void __attribute__((__noinline__, __fastcall__)) 114
126coro_transfer (struct coro_context *prev, struct coro_context *next) 115 asm (
127{ 116 ".text\n"
128 asm volatile ( 117 ".globl coro_transfer\n"
118 ".type coro_transfer, @function\n"
119 "coro_transfer:\n"
129#if __amd64 120 #if __amd64
130# define NUM_CLOBBERED 5 121 #define NUM_SAVED 6
122 "\tpush %rbp\n"
131 "push %%rbx\n\t" 123 "\tpush %rbx\n"
132 "push %%r12\n\t" 124 "\tpush %r12\n"
133 "push %%r13\n\t" 125 "\tpush %r13\n"
134 "push %%r14\n\t" 126 "\tpush %r14\n"
135 "push %%r15\n\t" 127 "\tpush %r15\n"
136 "mov %%rsp, %0\n\t" 128 "\tmov %rsp, (%rdi)\n"
137 "mov %1, %%rsp\n\t" 129 "\tmov (%rsi), %rsp\n"
138 "pop %%r15\n\t" 130 "\tpop %r15\n"
139 "pop %%r14\n\t" 131 "\tpop %r14\n"
140 "pop %%r13\n\t" 132 "\tpop %r13\n"
141 "pop %%r12\n\t" 133 "\tpop %r12\n"
142 "pop %%rbx\n\t" 134 "\tpop %rbx\n"
135 "\tpop %rbp\n"
143#elif __i386 136 #elif __i386
144# define NUM_CLOBBERED 4 137 #define NUM_SAVED 4
145 "push %%ebx\n\t"
146 "push %%esi\n\t"
147 "push %%edi\n\t"
148 "push %%ebp\n\t" 138 "\tpush %ebp\n"
149 "mov %%esp, %0\n\t" 139 "\tpush %ebx\n"
150 "mov %1, %%esp\n\t" 140 "\tpush %esi\n"
151 "pop %%ebp\n\t" 141 "\tpush %edi\n"
142 "\tmov %esp, (%eax)\n"
143 "\tmov (%edx), %esp\n"
152 "pop %%edi\n\t" 144 "\tpop %edi\n"
153 "pop %%esi\n\t" 145 "\tpop %esi\n"
154 "pop %%ebx\n\t" 146 "\tpop %ebx\n"
155#else 147 "\tpop %ebp\n"
148 #else
156# error unsupported architecture 149 #error unsupported architecture
157#endif 150 #endif
158 : "=m" (prev->sp) 151 "\tret\n"
159 : "m" (next->sp)
160 ); 152 );
161} 153
162#endif 154# endif
163 155
164/* initialize a machine state */ 156void
165void coro_create (coro_context *ctx, 157coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
166 coro_func coro, void *arg,
167 void *sptr, long ssize)
168{ 158{
169#if CORO_UCONTEXT 159 coro_context nctx;
170
171 getcontext (&(ctx->uc));
172
173 ctx->uc.uc_link = 0;
174 ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize);
175 ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize);
176 ctx->uc.uc_stack.ss_flags = 0;
177
178 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg);
179
180#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
181
182# if CORO_SJLJ 160# if CORO_SJLJ
183 stack_t ostk, nstk; 161 stack_t ostk, nstk;
184 struct sigaction osa, nsa; 162 struct sigaction osa, nsa;
185 sigset_t nsig, osig; 163 sigset_t nsig, osig;
186# endif 164# endif
187 coro_context nctx; 165
166 if (!coro)
167 return;
188 168
189 coro_init_func = coro; 169 coro_init_func = coro;
190 coro_init_arg = arg; 170 coro_init_arg = arg;
191 171
192 new_coro = ctx; 172 new_coro = ctx;
… …
218 { 198 {
219 perror ("sigaltstack"); 199 perror ("sigaltstack");
220 abort (); 200 abort ();
221 } 201 }
222 202
223 trampoline_count = 0; 203 trampoline_done = 0;
224 kill (getpid (), SIGUSR2); 204 kill (getpid (), SIGUSR2);
225 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 205 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
226 206
227 while (!trampoline_count) 207 while (!trampoline_done)
228 sigsuspend (&nsig); 208 sigsuspend (&nsig);
229 209
230 sigaltstack (0, &nstk); 210 sigaltstack (0, &nstk);
231 nstk.ss_flags = SS_DISABLE; 211 nstk.ss_flags = SS_DISABLE;
232 if (sigaltstack (&nstk, 0) < 0) 212 if (sigaltstack (&nstk, 0) < 0)
… …
238 218
239 if (~ostk.ss_flags & SS_DISABLE) 219 if (~ostk.ss_flags & SS_DISABLE)
240 sigaltstack (&ostk, 0); 220 sigaltstack (&ostk, 0);
241 221
242 sigaction (SIGUSR2, &osa, 0); 222 sigaction (SIGUSR2, &osa, 0);
243
244 sigprocmask (SIG_SETMASK, &osig, 0); 223 sigprocmask (SIG_SETMASK, &osig, 0);
245 224
246# elif CORO_LOSER 225# elif CORO_LOSER
247 226
248 setjmp (ctx->env); 227 coro_setjmp (ctx->env);
249#if __CYGWIN__ 228 #if __CYGWIN__
250 ctx->env[7] = (long)((char *)sptr + ssize); 229 ctx->env[7] = (long)((char *)sptr + ssize) - sizeof (long);
251 ctx->env[8] = (long)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;
252#elif defined(_M_IX86) 234 #elif defined(_M_IX86)
253 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init; 235 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
254 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr,ssize); 236 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
255#elif defined(_M_AMD64) 237 #elif defined(_M_AMD64)
256 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init; 238 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
257 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr,ssize); 239 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
258#elif defined(_M_IA64) 240 #elif defined(_M_IA64)
259 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init; 241 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
260 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr,ssize); 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
246
247# elif CORO_LINUX
248
249 coro_setjmp (ctx->env);
250 #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
251 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
252 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
253 #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
254 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
255 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize) - sizeof (long);
256 #elif defined (__GNU_LIBRARY__) && defined (__i386__)
257 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
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
261#else 399#else
262#error "microsoft libc or architecture not supported" 400# error unsupported backend
263#endif 401#endif
264 402
265# elif CORO_LINUX
266
267 _setjmp (ctx->env);
268#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
269 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
270 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize);
271#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
272 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
273 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize);
274#elif defined (__GNU_LIBRARY__) && defined (__i386__)
275 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
276 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize);
277#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
278 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
279 ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize);
280#else
281# error "linux libc or architecture not supported"
282#endif
283
284# elif CORO_IRIX
285
286 setjmp (ctx->env);
287 ctx->env[JB_PC] = (__uint64_t)coro_init;
288 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize);
289
290# elif CORO_ASM
291
292 ctx->sp = (volatile void **)(ssize + (char *)sptr);
293 *--ctx->sp = (void *)coro_init;
294 *--ctx->sp = (void *)coro_init; // this is needed when the prologue saves ebp
295 ctx->sp -= NUM_CLOBBERED;
296
297# endif
298
299 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
300
301#else
302# error unsupported architecture
303#endif
304}
305

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