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

Comparing cvsroot/libcoro/coro.c (file contents):
Revision 1.29 by root, Sun Mar 2 16:10:22 2008 UTC vs.
Revision 1.43 by root, Sun Nov 16 00:55:41 2008 UTC

… …
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 (
106 #if _XOPEN_UNIX > 0
107 _setjmp (new_coro->env)
108 #else
109 sigsetjmp (new_coro->env, 0)
110 #endif
107 { 111 ) {
108#if HAVE_CFI
109 asm (".cfi_startproc");
110#endif
111 coro_init (); /* start it */ 112 coro_init (); /* start it */
112#if HAVE_CFI
113 asm (".cfi_endproc");
114#endif
115 } 113 }
116 else 114 else
117 trampoline_count++; 115 trampoline_done = 1;
118} 116}
119 117
120# endif
121
122#endif 118# endif
123 119
124#if CORO_ASM 120# if CORO_ASM
125void __attribute__((__noinline__, __fastcall__)) 121
126coro_transfer (struct coro_context *prev, struct coro_context *next) 122 asm (
127{ 123 ".text\n"
128 asm volatile ( 124 ".globl coro_transfer\n"
125 ".type coro_transfer, @function\n"
126 "coro_transfer:\n"
129#if __amd64 127 #if __amd64
130# define NUM_CLOBBERED 5 128 #define NUM_SAVED 6
129 "\tpush %rbp\n"
131 "push %%rbx\n\t" 130 "\tpush %rbx\n"
132 "push %%r12\n\t" 131 "\tpush %r12\n"
133 "push %%r13\n\t" 132 "\tpush %r13\n"
134 "push %%r14\n\t" 133 "\tpush %r14\n"
135 "push %%r15\n\t" 134 "\tpush %r15\n"
136 "mov %%rsp, %0\n\t" 135 "\tmov %rsp, (%rdi)\n"
137 "mov %1, %%rsp\n\t" 136 "\tmov (%rsi), %rsp\n"
138 "pop %%r15\n\t" 137 "\tpop %r15\n"
139 "pop %%r14\n\t" 138 "\tpop %r14\n"
140 "pop %%r13\n\t" 139 "\tpop %r13\n"
141 "pop %%r12\n\t" 140 "\tpop %r12\n"
142 "pop %%rbx\n\t" 141 "\tpop %rbx\n"
142 "\tpop %rbp\n"
143#elif __i386 143 #elif __i386
144# define NUM_CLOBBERED 4 144 #define NUM_SAVED 4
145 "push %%ebx\n\t"
146 "push %%esi\n\t"
147 "push %%edi\n\t"
148 "push %%ebp\n\t" 145 "\tpush %ebp\n"
149 "mov %%esp, %0\n\t" 146 "\tpush %ebx\n"
150 "mov %1, %%esp\n\t" 147 "\tpush %esi\n"
151 "pop %%ebp\n\t" 148 "\tpush %edi\n"
149 "\tmov %esp, (%eax)\n"
150 "\tmov (%edx), %esp\n"
152 "pop %%edi\n\t" 151 "\tpop %edi\n"
153 "pop %%esi\n\t" 152 "\tpop %esi\n"
154 "pop %%ebx\n\t" 153 "\tpop %ebx\n"
155#else 154 "\tpop %ebp\n"
155 #else
156# error unsupported architecture 156 #error unsupported architecture
157#endif 157 #endif
158 : "=m" (prev->sp) 158 "\tret\n"
159 : "m" (next->sp)
160 ); 159 );
161} 160
162#endif 161# endif
163 162
164/* initialize a machine state */ 163void
165void coro_create (coro_context *ctx, 164coro_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{ 165{
169#if CORO_UCONTEXT 166 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 167# if CORO_SJLJ
183 stack_t ostk, nstk; 168 stack_t ostk, nstk;
184 struct sigaction osa, nsa; 169 struct sigaction osa, nsa;
185 sigset_t nsig, osig; 170 sigset_t nsig, osig;
186# endif 171# endif
187 coro_context nctx; 172
173 if (!coro)
174 return;
188 175
189 coro_init_func = coro; 176 coro_init_func = coro;
190 coro_init_arg = arg; 177 coro_init_arg = arg;
191 178
192 new_coro = ctx; 179 new_coro = ctx;
… …
218 { 205 {
219 perror ("sigaltstack"); 206 perror ("sigaltstack");
220 abort (); 207 abort ();
221 } 208 }
222 209
223 trampoline_count = 0; 210 trampoline_done = 0;
224 kill (getpid (), SIGUSR2); 211 kill (getpid (), SIGUSR2);
225 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 212 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
226 213
227 while (!trampoline_count) 214 while (!trampoline_done)
228 sigsuspend (&nsig); 215 sigsuspend (&nsig);
229 216
230 sigaltstack (0, &nstk); 217 sigaltstack (0, &nstk);
231 nstk.ss_flags = SS_DISABLE; 218 nstk.ss_flags = SS_DISABLE;
232 if (sigaltstack (&nstk, 0) < 0) 219 if (sigaltstack (&nstk, 0) < 0)
… …
238 225
239 if (~ostk.ss_flags & SS_DISABLE) 226 if (~ostk.ss_flags & SS_DISABLE)
240 sigaltstack (&ostk, 0); 227 sigaltstack (&ostk, 0);
241 228
242 sigaction (SIGUSR2, &osa, 0); 229 sigaction (SIGUSR2, &osa, 0);
243
244 sigprocmask (SIG_SETMASK, &osig, 0); 230 sigprocmask (SIG_SETMASK, &osig, 0);
245 231
246# elif CORO_LOSER 232# elif CORO_LOSER
247 233
248 setjmp (ctx->env); 234 setjmp (ctx->env);
249#if __CYGWIN__ 235 #if __CYGWIN__
250 ctx->env[7] = (long)((char *)sptr + ssize); 236 ctx->env[7] = (long)((char *)sptr + ssize) - sizeof (long);
251 ctx->env[8] = (long)coro_init; 237 ctx->env[8] = (long)coro_init;
252#elif defined(_M_IX86) 238 #elif defined(_M_IX86)
253 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init; 239 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
254 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr,ssize); 240 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
255#elif defined(_M_AMD64) 241 #elif defined(_M_AMD64)
256 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init; 242 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
257 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr,ssize); 243 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
258#elif defined(_M_IA64) 244 #elif defined(_M_IA64)
259 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init; 245 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
260 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr,ssize); 246 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
247 #else
248 #error "microsoft libc or architecture not supported"
249 #endif
250
251# elif CORO_LINUX
252
253 _setjmp (ctx->env);
254 #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
255 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
256 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
257 #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
258 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
259 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize) - sizeof (long);
260 #elif defined (__GNU_LIBRARY__) && defined (__i386__)
261 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
262 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
263 #elif defined (__GNU_LIBRARY__) && defined (__amd64__)
264 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
265 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
266 #else
267 #error "linux libc or architecture not supported"
268 #endif
269
270# elif CORO_IRIX
271
272 sigsetjmp (ctx->env, 0);
273 ctx->env[JB_PC] = (__uint64_t)coro_init;
274 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
275
276# elif CORO_ASM
277
278 ctx->sp = (void **)(ssize + (char *)sptr);
279 *--ctx->sp = (void *)abort; /* needed for alignment only */
280 *--ctx->sp = (void *)coro_init;
281 ctx->sp -= NUM_SAVED;
282
283# elif CORO_UCONTEXT
284
285 getcontext (&(ctx->uc));
286
287 ctx->uc.uc_link = 0;
288 ctx->uc.uc_stack.ss_sp = sptr;
289 ctx->uc.uc_stack.ss_size = (size_t)ssize;
290 ctx->uc.uc_stack.ss_flags = 0;
291
292 makecontext (&(ctx->uc), (void (*)())coro_init, 0);
293
294# endif
295
296 coro_transfer (create_coro, new_coro);
297}
298
299/*****************************************************************************/
300/* pthread backend */
301/*****************************************************************************/
302#elif CORO_PTHREAD
303
304/* this mutex will be locked by the running coroutine */
305pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
306
307struct coro_init_args
308{
309 coro_func func;
310 void *arg;
311 coro_context *self, *main;
312};
313
314static pthread_t null_tid;
315
316/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */
317static void
318mutex_unlock_wrapper (void *arg)
319{
320 pthread_mutex_unlock ((pthread_mutex_t *)arg);
321}
322
323static void *
324coro_init (void *args_)
325{
326 struct coro_init_args *args = (struct coro_init_args *)args_;
327 coro_func func = args->func;
328 void *arg = args->arg;
329
330 pthread_mutex_lock (&coro_mutex);
331
332 /* we try to be good citizens and use deferred cancellation and cleanup handlers */
333 pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex);
334 coro_transfer (args->self, args->main);
335 func (arg);
336 pthread_cleanup_pop (1);
337
338 return 0;
339}
340
341void
342coro_transfer (coro_context *prev, coro_context *next)
343{
344 pthread_cond_signal (&next->cv);
345 pthread_cond_wait (&prev->cv, &coro_mutex);
346#if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */
347 pthread_testcancel ();
348#endif
349}
350
351void
352coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
353{
354 static coro_context nctx;
355 static int once;
356
357 if (!once)
358 {
359 once = 1;
360
361 pthread_mutex_lock (&coro_mutex);
362 pthread_cond_init (&nctx.cv, 0);
363 null_tid = pthread_self ();
364 }
365
366 pthread_cond_init (&ctx->cv, 0);
367
368 if (coro)
369 {
370 pthread_attr_t attr;
371 struct coro_init_args args;
372
373 args.func = coro;
374 args.arg = arg;
375 args.self = ctx;
376 args.main = &nctx;
377
378 pthread_attr_init (&attr);
379 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
380 pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
381 pthread_create (&ctx->id, &attr, coro_init, &args);
382
383 coro_transfer (args.main, args.self);
384 }
385 else
386 ctx->id = null_tid;
387}
388
389void
390coro_destroy (coro_context *ctx)
391{
392 if (!pthread_equal (ctx->id, null_tid))
393 {
394 pthread_cancel (ctx->id);
395 pthread_mutex_unlock (&coro_mutex);
396 pthread_join (ctx->id, 0);
397 pthread_mutex_lock (&coro_mutex);
398 }
399
400 pthread_cond_destroy (&ctx->cv);
401}
402
261#else 403#else
262#error "microsoft libc or architecture not supported" 404# error unsupported backend
263#endif 405#endif
264 406
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

Diff Legend

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