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Comparing libcoro/coro.c (file contents):
Revision 1.32 by root, Wed Jul 16 00:47:05 2008 UTC vs.
Revision 1.44 by root, Wed Nov 19 02:56:16 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) || (_M_IX86 && CORO_LOSER) 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) || ((_M_AMD64 || _M_IA64) && CORO_LOSER) 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__, __regparm__(2))) 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_SAVED 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_SAVED 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
156void
157coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
158{
159 coro_context nctx;
160# if CORO_SJLJ
161 stack_t ostk, nstk;
162 struct sigaction osa, nsa;
163 sigset_t nsig, osig;
164# endif
165
166 if (!coro)
167 return;
168
169 coro_init_func = coro;
170 coro_init_arg = arg;
171
172 new_coro = ctx;
173 create_coro = &nctx;
174
175# if CORO_SJLJ
176 /* we use SIGUSR2. first block it, then fiddle with it. */
177
178 sigemptyset (&nsig);
179 sigaddset (&nsig, SIGUSR2);
180 sigprocmask (SIG_BLOCK, &nsig, &osig);
181
182 nsa.sa_handler = trampoline;
183 sigemptyset (&nsa.sa_mask);
184 nsa.sa_flags = SA_ONSTACK;
185
186 if (sigaction (SIGUSR2, &nsa, &osa))
187 {
188 perror ("sigaction");
189 abort ();
190 }
191
192 /* set the new stack */
193 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
194 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
195 nstk.ss_flags = 0;
196
197 if (sigaltstack (&nstk, &ostk) < 0)
198 {
199 perror ("sigaltstack");
200 abort ();
201 }
202
203 trampoline_done = 0;
204 kill (getpid (), SIGUSR2);
205 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
206
207 while (!trampoline_done)
208 sigsuspend (&nsig);
209
210 sigaltstack (0, &nstk);
211 nstk.ss_flags = SS_DISABLE;
212 if (sigaltstack (&nstk, 0) < 0)
213 perror ("sigaltstack");
214
215 sigaltstack (0, &nstk);
216 if (~nstk.ss_flags & SS_DISABLE)
217 abort ();
218
219 if (~ostk.ss_flags & SS_DISABLE)
220 sigaltstack (&ostk, 0);
221
222 sigaction (SIGUSR2, &osa, 0);
223 sigprocmask (SIG_SETMASK, &osig, 0);
224
225# elif CORO_LOSER
226
227 coro_setjmp (ctx->env);
228 #if __CYGWIN__
229 ctx->env[7] = (long)((char *)sptr + ssize) - sizeof (long);
230 ctx->env[8] = (long)coro_init;
231 #elif defined(_M_IX86)
232 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
233 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
234 #elif defined(_M_AMD64)
235 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
236 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
237 #elif defined(_M_IA64)
238 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
239 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
240 #else
241 #error "microsoft libc or architecture not supported"
242 #endif
243
244# elif CORO_LINUX
245
246 coro_setjmp (ctx->env);
247 #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
248 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
249 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
250 #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
251 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
252 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize) - sizeof (long);
253 #elif defined (__GNU_LIBRARY__) && defined (__i386__)
254 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
255 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
256 #elif defined (__GNU_LIBRARY__) && defined (__amd64__)
257 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
258 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
259 #else
260 #error "linux libc or architecture not supported"
261 #endif
262
263# elif CORO_IRIX
264
265 coro_setjmp (ctx->env, 0);
266 ctx->env[JB_PC] = (__uint64_t)coro_init;
267 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
268
269# elif CORO_ASM
270
271 ctx->sp = (void **)(ssize + (char *)sptr);
272 *--ctx->sp = (void *)abort; /* needed for alignment only */
273 *--ctx->sp = (void *)coro_init;
274 ctx->sp -= NUM_SAVED;
275
276# elif CORO_UCONTEXT
277
278 getcontext (&(ctx->uc));
279
280 ctx->uc.uc_link = 0;
281 ctx->uc.uc_stack.ss_sp = sptr;
282 ctx->uc.uc_stack.ss_size = (size_t)ssize;
283 ctx->uc.uc_stack.ss_flags = 0;
284
285 makecontext (&(ctx->uc), (void (*)())coro_init, 0);
286
287# endif
288
289 coro_transfer (create_coro, new_coro);
290}
291
292/*****************************************************************************/
293/* pthread backend */
294/*****************************************************************************/
164#if CORO_PTHREAD 295#elif CORO_PTHREAD
165 296
297/* this mutex will be locked by the running coroutine */
298pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
299
166struct coro_init_args { 300struct coro_init_args
301{
167 coro_func func; 302 coro_func func;
168 void *arg; 303 void *arg;
169 coro_context *self, *main; 304 coro_context *self, *main;
170}; 305};
171 306
172pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; 307static pthread_t null_tid;
308
309/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */
310static void
311mutex_unlock_wrapper (void *arg)
312{
313 pthread_mutex_unlock ((pthread_mutex_t *)arg);
314}
173 315
174static void * 316static void *
175trampoline (void *args_) 317coro_init (void *args_)
176{ 318{
177 struct coro_init_args *args = (struct coro_init_args *)args_; 319 struct coro_init_args *args = (struct coro_init_args *)args_;
178 coro_func func = args->func; 320 coro_func func = args->func;
179 void *arg = args->arg; 321 void *arg = args->arg;
180 322
181 pthread_mutex_lock (&coro_mutex); 323 pthread_mutex_lock (&coro_mutex);
182 pthread_cond_destroy (&args->self->c); 324
325 /* we try to be good citizens and use deferred cancellation and cleanup handlers */
326 pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex);
183 coro_transfer (args->self, args->main); 327 coro_transfer (args->self, args->main);
184 func (arg); 328 func (arg);
185 pthread_mutex_unlock (&coro_mutex); 329 pthread_cleanup_pop (1);
186 330
187 return 0; 331 return 0;
188} 332}
189 333
334void
190void coro_transfer(coro_context *prev, coro_context *next) 335coro_transfer (coro_context *prev, coro_context *next)
191{ 336{
192 pthread_cond_init (&prev->c, 0);
193 pthread_cond_signal (&next->c); 337 pthread_cond_signal (&next->cv);
194 pthread_cond_wait (&prev->c, &coro_mutex); 338 pthread_cond_wait (&prev->cv, &coro_mutex);
195 pthread_cond_destroy (&prev->c); 339#if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */
196} 340 pthread_testcancel ();
197
198#endif 341#endif
342}
199 343
200/* initialize a machine state */ 344void
201void coro_create (coro_context *ctx, 345coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
202 coro_func coro, void *arg,
203 void *sptr, long ssize)
204{ 346{
205#if CORO_UCONTEXT
206
207 getcontext (&(ctx->uc));
208
209 ctx->uc.uc_link = 0;
210 ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize);
211 ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize);
212 ctx->uc.uc_stack.ss_flags = 0;
213
214 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg);
215
216#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
217
218# if CORO_SJLJ
219 stack_t ostk, nstk;
220 struct sigaction osa, nsa;
221 sigset_t nsig, osig;
222# endif
223 coro_context nctx; 347 static coro_context nctx;
224
225 coro_init_func = coro;
226 coro_init_arg = arg;
227
228 new_coro = ctx;
229 create_coro = &nctx;
230
231# if CORO_SJLJ
232 /* we use SIGUSR2. first block it, then fiddle with it. */
233
234 sigemptyset (&nsig);
235 sigaddset (&nsig, SIGUSR2);
236 sigprocmask (SIG_BLOCK, &nsig, &osig);
237
238 nsa.sa_handler = trampoline;
239 sigemptyset (&nsa.sa_mask);
240 nsa.sa_flags = SA_ONSTACK;
241
242 if (sigaction (SIGUSR2, &nsa, &osa))
243 {
244 perror ("sigaction");
245 abort ();
246 }
247
248 /* set the new stack */
249 nstk.ss_sp = STACK_ADJUST_PTR (sptr,ssize); /* yes, some platforms (IRIX) get this wrong. */
250 nstk.ss_size = STACK_ADJUST_SIZE (sptr,ssize);
251 nstk.ss_flags = 0;
252
253 if (sigaltstack (&nstk, &ostk) < 0)
254 {
255 perror ("sigaltstack");
256 abort ();
257 }
258
259 trampoline_count = 0;
260 kill (getpid (), SIGUSR2);
261 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
262
263 while (!trampoline_count)
264 sigsuspend (&nsig);
265
266 sigaltstack (0, &nstk);
267 nstk.ss_flags = SS_DISABLE;
268 if (sigaltstack (&nstk, 0) < 0)
269 perror ("sigaltstack");
270
271 sigaltstack (0, &nstk);
272 if (~nstk.ss_flags & SS_DISABLE)
273 abort ();
274
275 if (~ostk.ss_flags & SS_DISABLE)
276 sigaltstack (&ostk, 0);
277
278 sigaction (SIGUSR2, &osa, 0);
279
280 sigprocmask (SIG_SETMASK, &osig, 0);
281
282# elif CORO_LOSER
283
284 setjmp (ctx->env);
285#if __CYGWIN__
286 ctx->env[7] = (long)((char *)sptr + ssize);
287 ctx->env[8] = (long)coro_init;
288#elif defined(_M_IX86)
289 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
290 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize);
291#elif defined(_M_AMD64)
292 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
293 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize);
294#elif defined(_M_IA64)
295 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
296 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize);
297#else
298# error "microsoft libc or architecture not supported"
299#endif
300
301# elif CORO_LINUX
302
303 _setjmp (ctx->env);
304#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
305 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
306 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize);
307#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
308 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
309 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize);
310#elif defined (__GNU_LIBRARY__) && defined (__i386__)
311 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
312 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize);
313#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
314 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
315 ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize);
316#else
317# error "linux libc or architecture not supported"
318#endif
319
320# elif CORO_IRIX
321
322 setjmp (ctx->env);
323 ctx->env[JB_PC] = (__uint64_t)coro_init;
324 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize);
325
326# elif CORO_ASM
327
328 ctx->sp = (volatile void **)(ssize + (char *)sptr);
329 *--ctx->sp = (void *)coro_init;
330 *--ctx->sp = (void *)coro_init; // this is needed when the prologue saves ebp
331 ctx->sp -= NUM_SAVED;
332
333# endif
334
335 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
336
337# elif CORO_PTHREAD
338
339 pthread_t id;
340 pthread_attr_t attr;
341 coro_context nctx;
342 struct coro_init_args args;
343 static int once; 348 static int once;
344 349
345 if (!once) 350 if (!once)
346 { 351 {
352 once = 1;
353
347 pthread_mutex_lock (&coro_mutex); 354 pthread_mutex_lock (&coro_mutex);
348 once = 1; 355 pthread_cond_init (&nctx.cv, 0);
356 null_tid = pthread_self ();
357 }
358
359 pthread_cond_init (&ctx->cv, 0);
360
361 if (coro)
349 } 362 {
363 pthread_attr_t attr;
364 struct coro_init_args args;
350 365
351 args.func = coro; 366 args.func = coro;
352 args.arg = arg; 367 args.arg = arg;
353 args.self = ctx; 368 args.self = ctx;
354 args.main = &nctx; 369 args.main = &nctx;
355 370
356 pthread_attr_init (&attr); 371 pthread_attr_init (&attr);
357 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
358 pthread_attr_setstack (&attr, sptr, (size_t)ssize); 372 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
373 pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
359 pthread_create (&id, &attr, trampoline, &args); 374 pthread_create (&ctx->id, &attr, coro_init, &args);
360 375
361 pthread_cond_init (&args.self->c, 0);
362 coro_transfer (args.main, args.self); 376 coro_transfer (args.main, args.self);
377 }
378 else
379 ctx->id = null_tid;
380}
381
382void
383coro_destroy (coro_context *ctx)
384{
385 if (!pthread_equal (ctx->id, null_tid))
386 {
387 pthread_cancel (ctx->id);
388 pthread_mutex_unlock (&coro_mutex);
389 pthread_join (ctx->id, 0);
390 pthread_mutex_lock (&coro_mutex);
391 }
392
393 pthread_cond_destroy (&ctx->cv);
394}
363 395
364#else 396#else
365# error unsupported backend 397# error unsupported backend
366#endif 398#endif
367}
368 399

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