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/cvs/cvsroot/libcoro/coro.c
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Comparing cvsroot/libcoro/coro.c (file contents):
Revision 1.35 by root, Mon Nov 3 16:05:38 2008 UTC vs.
Revision 1.38 by root, Fri Nov 7 20:12:26 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
43#if !defined(STACK_ADJUST_PTR) 45#if !defined(STACK_ADJUST_PTR)
44/* IRIX is decidedly NON-unix */ 46/* IRIX is decidedly NON-unix */
45# if __sgi 47# if __sgi
46# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8) 48# define STACK_ADJUST_PTR(sp,ss) ((char *)(sp) + (ss) - 8)
47# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8) 49# define STACK_ADJUST_SIZE(sp,ss) ((ss) - 8)
… …
61# include <stddef.h> 63# include <stddef.h>
62#endif 64#endif
63 65
64#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM 66#if CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
65 67
66#include <stdlib.h> 68# include <stdlib.h>
67 69
68#if CORO_SJLJ 70# if CORO_SJLJ
69# include <stdio.h> 71# include <stdio.h>
70# include <signal.h> 72# include <signal.h>
71# include <unistd.h> 73# include <unistd.h>
72#endif 74# endif
73 75
74static volatile coro_func coro_init_func; 76static volatile coro_func coro_init_func;
75static volatile void *coro_init_arg; 77static volatile void *coro_init_arg;
76static volatile coro_context *new_coro, *create_coro; 78static volatile coro_context *new_coro, *create_coro;
77 79
78/* what we really want to detect here is wether we use a new-enough version of GAS */ 80/* 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 */ 81/* instead, check for gcc 3, ELF and GNU/Linux and hope for the best */
80#if __GNUC__ >= 3 && __ELF__ && __linux__ 82# if __GNUC__ >= 3 && __ELF__ && __linux__
81# define HAVE_CFI 1 83# define HAVE_CFI 1
82#endif 84# endif
83 85
84static void 86static void
85coro_init (void) 87coro_init (void)
86{ 88{
87 volatile coro_func func = coro_init_func; 89 volatile coro_func func = coro_init_func;
… …
103static void 105static void
104trampoline (int sig) 106trampoline (int sig)
105{ 107{
106 if (setjmp (((coro_context *)new_coro)->env)) 108 if (setjmp (((coro_context *)new_coro)->env))
107 { 109 {
108#if HAVE_CFI 110# if HAVE_CFI
109 asm (".cfi_startproc"); 111 asm (".cfi_startproc");
110#endif 112# endif
111 coro_init (); /* start it */ 113 coro_init (); /* start it */
112#if HAVE_CFI 114# if HAVE_CFI
113 asm (".cfi_endproc"); 115 asm (".cfi_endproc");
114#endif 116# endif
115 } 117 }
116 else 118 else
117 trampoline_count++; 119 trampoline_count++;
118} 120}
119 121
120# endif 122# endif
121 123
122#endif 124#endif
123 125
124#if CORO_ASM 126#if CORO_ASM
127
125asm ( 128 asm (
126 ".text\n" 129 ".text\n"
127 ".globl coro_transfer\n" 130 ".globl coro_transfer\n"
128 ".type coro_transfer, @function\n" 131 ".type coro_transfer, @function\n"
129 "coro_transfer:\n" 132 "coro_transfer:\n"
130#if __amd64 133# if __amd64
131# define NUM_SAVED 5 134# define NUM_SAVED 6
135 "\tpush %rbp\n"
132 "\tpush %rbx\n" 136 "\tpush %rbx\n"
133 "\tpush %r12\n" 137 "\tpush %r12\n"
134 "\tpush %r13\n" 138 "\tpush %r13\n"
135 "\tpush %r14\n" 139 "\tpush %r14\n"
136 "\tpush %r15\n" 140 "\tpush %r15\n"
137 "\tmov %rsp, (%rdi)\n" 141 "\tmov %rsp, (%rdi)\n"
138 "\tmov (%rsi), %rsp\n" 142 "\tmov (%rsi), %rsp\n"
139 "\tpop %r15\n" 143 "\tpop %r15\n"
140 "\tpop %r14\n" 144 "\tpop %r14\n"
141 "\tpop %r13\n" 145 "\tpop %r13\n"
142 "\tpop %r12\n" 146 "\tpop %r12\n"
143 "\tpop %rbx\n" 147 "\tpop %rbx\n"
148 "\tpop %rbp\n"
144#elif __i386 149# elif __i386
145# define NUM_SAVED 4 150# define NUM_SAVED 4
146 "\tpush %ebx\n"
147 "\tpush %esi\n"
148 "\tpush %edi\n"
149 "\tpush %ebp\n" 151 "\tpush %ebp\n"
152 "\tpush %ebx\n"
153 "\tpush %esi\n"
154 "\tpush %edi\n"
150 "\tmov %esp, (%eax)\n" 155 "\tmov %esp, (%eax)\n"
151 "\tmov (%edx), %esp\n" 156 "\tmov (%edx), %esp\n"
152 "\tpop %ebp\n"
153 "\tpop %edi\n" 157 "\tpop %edi\n"
154 "\tpop %esi\n" 158 "\tpop %esi\n"
155 "\tpop %ebx\n" 159 "\tpop %ebx\n"
160 "\tpop %ebp\n"
156#else 161# else
157# error unsupported architecture 162# error unsupported architecture
158#endif 163# endif
159 "\tret\n" 164 "\tret\n"
160); 165 );
166
161#endif 167#endif
162 168
163#if CORO_PTHREAD 169#if CORO_PTHREAD
164 170
171/* this mutex will be locked by the running coroutine */
172pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
173
165struct coro_init_args { 174struct coro_init_args
175{
166 coro_func func; 176 coro_func func;
167 void *arg; 177 void *arg;
168 coro_context *self, *main; 178 coro_context *self, *main;
169}; 179};
170 180
171pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; 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}
172 189
173static void * 190static void *
174trampoline (void *args_) 191trampoline (void *args_)
175{ 192{
176 struct coro_init_args *args = (struct coro_init_args *)args_; 193 struct coro_init_args *args = (struct coro_init_args *)args_;
177 coro_func func = args->func; 194 coro_func func = args->func;
178 void *arg = args->arg; 195 void *arg = args->arg;
179 196
180 pthread_mutex_lock (&coro_mutex); 197 pthread_mutex_lock (&coro_mutex);
181 pthread_cond_destroy (&args->self->c); 198
199 /* we try to be good citizens and use deferred cancellation and cleanup handlers */
200 pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex);
182 coro_transfer (args->self, args->main); 201 coro_transfer (args->self, args->main);
183 func (arg); 202 func (arg);
184 pthread_mutex_unlock (&coro_mutex); 203 pthread_cleanup_pop (1);
185 204
186 return 0; 205 return 0;
187} 206}
188 207
189asm(""); 208void
190
191void coro_transfer(coro_context *prev, coro_context *next) 209coro_transfer (coro_context *prev, coro_context *next)
192{ 210{
193 pthread_cond_init (&prev->c, 0);
194 pthread_cond_signal (&next->c); 211 pthread_cond_signal (&next->cv);
195 pthread_cond_wait (&prev->c, &coro_mutex); 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
196 pthread_cond_destroy (&prev->c); 226 pthread_cond_destroy (&ctx->cv);
197} 227}
198 228
199#endif 229#endif
200 230
201/* initialize a machine state */ 231/* initialize a machine state */
202void coro_create (coro_context *ctx, 232void
203 coro_func coro, void *arg, 233coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
204 void *sptr, long ssize)
205{ 234{
206#if CORO_UCONTEXT 235#if CORO_UCONTEXT
236
237 if (!coro)
238 return;
207 239
208 getcontext (&(ctx->uc)); 240 getcontext (&(ctx->uc));
209 241
210 ctx->uc.uc_link = 0; 242 ctx->uc.uc_link = 0;
211 ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize); 243 ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize);
212 ctx->uc.uc_stack.ss_size = (size_t) STACK_ADJUST_SIZE (sptr,ssize); 244 ctx->uc.uc_stack.ss_size = (size_t)STACK_ADJUST_SIZE (sptr,ssize);
213 ctx->uc.uc_stack.ss_flags = 0; 245 ctx->uc.uc_stack.ss_flags = 0;
214 246
215 makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); 247 makecontext (&(ctx->uc), (void (*)())coro, 1, arg);
216 248
217#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM 249#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM
218 250
219# if CORO_SJLJ 251# if CORO_SJLJ
220 stack_t ostk, nstk; 252 stack_t ostk, nstk;
221 struct sigaction osa, nsa; 253 struct sigaction osa, nsa;
222 sigset_t nsig, osig; 254 sigset_t nsig, osig;
223# endif 255# endif
224 coro_context nctx; 256 coro_context nctx;
225 257
258 if (!coro)
259 return;
260
226 coro_init_func = coro; 261 coro_init_func = coro;
227 coro_init_arg = arg; 262 coro_init_arg = arg;
228 263
229 new_coro = ctx; 264 new_coro = ctx;
230 create_coro = &nctx; 265 create_coro = &nctx;
… …
282 317
283# elif CORO_LOSER 318# elif CORO_LOSER
284 319
285 setjmp (ctx->env); 320 setjmp (ctx->env);
286#if __CYGWIN__ 321#if __CYGWIN__
287 ctx->env[7] = (long)((char *)sptr + ssize); 322 ctx->env[7] = (long)((char *)sptr + ssize) - sizeof (long);
288 ctx->env[8] = (long)coro_init; 323 ctx->env[8] = (long)coro_init;
289#elif defined(_M_IX86) 324#elif defined(_M_IX86)
290 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init; 325 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
291 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize); 326 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
292#elif defined(_M_AMD64) 327#elif defined(_M_AMD64)
293 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init; 328 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
294 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize); 329 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
295#elif defined(_M_IA64) 330#elif defined(_M_IA64)
296 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init; 331 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
297 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize); 332 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
298#else 333#else
299# error "microsoft libc or architecture not supported" 334# error "microsoft libc or architecture not supported"
300#endif 335#endif
301 336
302# elif CORO_LINUX 337# elif CORO_LINUX
303 338
304 _setjmp (ctx->env); 339 _setjmp (ctx->env);
305#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) 340#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
306 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; 341 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
307 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize); 342 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
308#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) 343#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
309 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; 344 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
310 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); 345 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize) - sizeof (long);
311#elif defined (__GNU_LIBRARY__) && defined (__i386__) 346#elif defined (__GNU_LIBRARY__) && defined (__i386__)
312 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; 347 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
313 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); 348 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
314#elif defined (__GNU_LIBRARY__) && defined (__amd64__) 349#elif defined (__GNU_LIBRARY__) && defined (__amd64__)
315 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; 350 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
316 ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize); 351 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
317#else 352#else
318# error "linux libc or architecture not supported" 353# error "linux libc or architecture not supported"
319#endif 354#endif
320 355
321# elif CORO_IRIX 356# elif CORO_IRIX
322 357
323 setjmp (ctx->env); 358 setjmp (ctx->env);
324 ctx->env[JB_PC] = (__uint64_t)coro_init; 359 ctx->env[JB_PC] = (__uint64_t)coro_init;
325 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize); 360 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
326 361
327# elif CORO_ASM 362# elif CORO_ASM
328 363
329 ctx->sp = (volatile void **)(ssize + (char *)sptr); 364 ctx->sp = (volatile void **)(ssize + (char *)sptr);
330 /* we try to allow for both functions with and without frame pointers */ 365 *--ctx->sp = (void *)abort; /* needed for alignment only */
331 *--ctx->sp = (void *)coro_init; 366 *--ctx->sp = (void *)coro_init;
332 { 367 ctx->sp -= NUM_SAVED;
333 int i;
334 for (i = NUM_SAVED; i--; )
335 *--ctx->sp = 0;
336 }
337 368
338# endif 369# endif
339 370
340 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); 371 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro);
341 372
342# elif CORO_PTHREAD 373# elif CORO_PTHREAD
343 374
344 pthread_t id;
345 pthread_attr_t attr;
346 coro_context nctx; 375 static coro_context nctx;
347 struct coro_init_args args;
348 static int once; 376 static int once;
349 377
350 if (!once) 378 if (!once)
351 { 379 {
380 once = 1;
381
352 pthread_mutex_lock (&coro_mutex); 382 pthread_mutex_lock (&coro_mutex);
353 once = 1; 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)
354 } 390 {
391 pthread_attr_t attr;
392 struct coro_init_args args;
355 393
356 args.func = coro; 394 args.func = coro;
357 args.arg = arg; 395 args.arg = arg;
358 args.self = ctx; 396 args.self = ctx;
359 args.main = &nctx; 397 args.main = &nctx;
360 398
361 pthread_attr_init (&attr); 399 pthread_attr_init (&attr);
362 pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
363 pthread_attr_setstack (&attr, sptr, (size_t)ssize); 400 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
401 pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
364 pthread_create (&id, &attr, trampoline, &args); 402 pthread_create (&ctx->id, &attr, trampoline, &args);
365 403
366 pthread_cond_init (&args.self->c, 0);
367 coro_transfer (args.main, args.self); 404 coro_transfer (args.main, args.self);
405 }
406 else
407 ctx->id = null_tid;
368 408
369#else 409#else
370# error unsupported backend 410# error unsupported backend
371#endif 411#endif
372} 412}

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