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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 1.39 by root, Sat Nov 8 04:31:28 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 volatile coro_func coro_init_func;
75static volatile void *coro_init_arg; 80static volatile void *coro_init_arg;
76static volatile coro_context *new_coro, *create_coro; 81static volatile coro_context *new_coro, *create_coro;
77 82
78/* what we really want to detect here is wether we use a new-enough version of GAS */ 83/* 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 */ 84/* with dwarf debug info. instead, check for gcc 3, ELF and GNU/Linux and hope for the best */
80#if __GNUC__ >= 3 && __ELF__ && __linux__ 85# if __GNUC__ >= 3 && __ELF__ && __linux__
81# define HAVE_CFI 1 86# define HAVE_CFI 1
82#endif 87# endif
83 88
84static void 89static void
85coro_init (void) 90coro_init (void)
86{ 91{
87 volatile coro_func func = coro_init_func; 92 volatile coro_func func = coro_init_func;
… …
95 abort (); 100 abort ();
96} 101}
97 102
98# if CORO_SJLJ 103# if CORO_SJLJ
99 104
100static volatile int trampoline_count; 105static volatile int trampoline_done;
101 106
102/* trampoline signal handler */ 107/* trampoline signal handler */
103static void 108static void
104trampoline (int sig) 109trampoline (int sig)
105{ 110{
106 if (setjmp (((coro_context *)new_coro)->env)) 111 if (
112 #if _XOPEN_UNIX > 0
113 _setjmp (new_coro->env)
114 #else
115 setjmp (new_coro->env)
116 #endif
107 { 117 ) {
108#if HAVE_CFI 118 #if HAVE_CFI
109 asm (".cfi_startproc"); 119 asm (".cfi_startproc");
110#endif 120 #endif
111 coro_init (); /* start it */ 121 coro_init (); /* start it */
112#if HAVE_CFI 122 #if HAVE_CFI
113 asm (".cfi_endproc"); 123 asm (".cfi_endproc");
114#endif 124 #endif
115 } 125 }
116 else 126 else
117 trampoline_count++; 127 trampoline_done = 1;
118} 128}
119 129
120# endif
121
122#endif 130# endif
123 131
124#if CORO_ASM 132# if CORO_ASM
125void __attribute__((__noinline__, __fastcall__)) 133
126coro_transfer (struct coro_context *prev, struct coro_context *next) 134 asm (
127{ 135 ".text\n"
128 asm volatile ( 136 ".globl coro_transfer\n"
137 ".type coro_transfer, @function\n"
138 "coro_transfer:\n"
129#if __amd64 139 #if __amd64
130# define NUM_CLOBBERED 5 140 #define NUM_SAVED 6
141 "\tpush %rbp\n"
131 "push %%rbx\n\t" 142 "\tpush %rbx\n"
132 "push %%r12\n\t" 143 "\tpush %r12\n"
133 "push %%r13\n\t" 144 "\tpush %r13\n"
134 "push %%r14\n\t" 145 "\tpush %r14\n"
135 "push %%r15\n\t" 146 "\tpush %r15\n"
136 "mov %%rsp, %0\n\t" 147 "\tmov %rsp, (%rdi)\n"
137 "mov %1, %%rsp\n\t" 148 "\tmov (%rsi), %rsp\n"
138 "pop %%r15\n\t" 149 "\tpop %r15\n"
139 "pop %%r14\n\t" 150 "\tpop %r14\n"
140 "pop %%r13\n\t" 151 "\tpop %r13\n"
141 "pop %%r12\n\t" 152 "\tpop %r12\n"
142 "pop %%rbx\n\t" 153 "\tpop %rbx\n"
154 "\tpop %rbp\n"
143#elif __i386 155 #elif __i386
144# define NUM_CLOBBERED 4 156 #define NUM_SAVED 4
145 "push %%ebx\n\t"
146 "push %%esi\n\t"
147 "push %%edi\n\t"
148 "push %%ebp\n\t" 157 "\tpush %ebp\n"
149 "mov %%esp, %0\n\t" 158 "\tpush %ebx\n"
150 "mov %1, %%esp\n\t" 159 "\tpush %esi\n"
151 "pop %%ebp\n\t" 160 "\tpush %edi\n"
161 "\tmov %esp, (%eax)\n"
162 "\tmov (%edx), %esp\n"
152 "pop %%edi\n\t" 163 "\tpop %edi\n"
153 "pop %%esi\n\t" 164 "\tpop %esi\n"
154 "pop %%ebx\n\t" 165 "\tpop %ebx\n"
155#else 166 "\tpop %ebp\n"
167 #else
156# error unsupported architecture 168 #error unsupported architecture
157#endif 169 #endif
158 : "=m" (prev->sp) 170 "\tret\n"
159 : "m" (next->sp)
160 ); 171 );
161} 172
162#endif 173# endif
163 174
164/* initialize a machine state */ 175void
165void coro_create (coro_context *ctx, 176coro_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{ 177{
169#if CORO_UCONTEXT 178 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 179# if CORO_SJLJ
183 stack_t ostk, nstk; 180 stack_t ostk, nstk;
184 struct sigaction osa, nsa; 181 struct sigaction osa, nsa;
185 sigset_t nsig, osig; 182 sigset_t nsig, osig;
186# endif 183# endif
187 coro_context nctx; 184
185 if (!coro)
186 return;
188 187
189 coro_init_func = coro; 188 coro_init_func = coro;
190 coro_init_arg = arg; 189 coro_init_arg = arg;
191 190
192 new_coro = ctx; 191 new_coro = ctx;
… …
218 { 217 {
219 perror ("sigaltstack"); 218 perror ("sigaltstack");
220 abort (); 219 abort ();
221 } 220 }
222 221
223 trampoline_count = 0; 222 trampoline_done = 0;
224 kill (getpid (), SIGUSR2); 223 kill (getpid (), SIGUSR2);
225 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); 224 sigfillset (&nsig); sigdelset (&nsig, SIGUSR2);
226 225
227 while (!trampoline_count) 226 while (!trampoline_done)
228 sigsuspend (&nsig); 227 sigsuspend (&nsig);
229 228
230 sigaltstack (0, &nstk); 229 sigaltstack (0, &nstk);
231 nstk.ss_flags = SS_DISABLE; 230 nstk.ss_flags = SS_DISABLE;
232 if (sigaltstack (&nstk, 0) < 0) 231 if (sigaltstack (&nstk, 0) < 0)
… …
238 237
239 if (~ostk.ss_flags & SS_DISABLE) 238 if (~ostk.ss_flags & SS_DISABLE)
240 sigaltstack (&ostk, 0); 239 sigaltstack (&ostk, 0);
241 240
242 sigaction (SIGUSR2, &osa, 0); 241 sigaction (SIGUSR2, &osa, 0);
243
244 sigprocmask (SIG_SETMASK, &osig, 0); 242 sigprocmask (SIG_SETMASK, &osig, 0);
245 243
246# elif CORO_LOSER 244# elif CORO_LOSER
247 245
248 setjmp (ctx->env); 246 setjmp (ctx->env);
249#if __CYGWIN__ 247 #if __CYGWIN__
250 ctx->env[7] = (long)((char *)sptr + ssize); 248 ctx->env[7] = (long)((char *)sptr + ssize) - sizeof (long);
251 ctx->env[8] = (long)coro_init; 249 ctx->env[8] = (long)coro_init;
252#elif defined(_M_IX86) 250 #elif defined(_M_IX86)
253 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init; 251 ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init;
254 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr,ssize); 252 ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
255#elif defined(_M_AMD64) 253 #elif defined(_M_AMD64)
256 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init; 254 ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init;
257 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr,ssize); 255 ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
258#elif defined(_M_IA64) 256 #elif defined(_M_IA64)
259 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init; 257 ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init;
260 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr,ssize); 258 ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
261#else 259 #else
262#error "microsoft libc or architecture not supported" 260 #error "microsoft libc or architecture not supported"
263#endif 261 #endif
264 262
265# elif CORO_LINUX 263# elif CORO_LINUX
266 264
267 _setjmp (ctx->env); 265 _setjmp (ctx->env);
268#if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) 266 #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP)
269 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; 267 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
270 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize); 268 ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
271#elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) 269 #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__)
272 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; 270 ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init;
273 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize); 271 ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize) - sizeof (long);
274#elif defined (__GNU_LIBRARY__) && defined (__i386__) 272 #elif defined (__GNU_LIBRARY__) && defined (__i386__)
275 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; 273 ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init;
276 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize); 274 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
277#elif defined (__GNU_LIBRARY__) && defined (__amd64__) 275 #elif defined (__GNU_LIBRARY__) && defined (__amd64__)
278 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; 276 ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init;
279 ctx->env[0].__jmpbuf[JB_RSP] = (long)STACK_ADJUST_PTR (sptr, ssize); 277 ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long);
280#else 278 #else
281# error "linux libc or architecture not supported" 279 #error "linux libc or architecture not supported"
282#endif 280 #endif
283 281
284# elif CORO_IRIX 282# elif CORO_IRIX
285 283
286 setjmp (ctx->env); 284 setjmp (ctx->env);
287 ctx->env[JB_PC] = (__uint64_t)coro_init; 285 ctx->env[JB_PC] = (__uint64_t)coro_init;
288 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize); 286 ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long);
289 287
290# elif CORO_ASM 288# elif CORO_ASM
291 289
292 ctx->sp = (volatile void **)(ssize + (char *)sptr); 290 ctx->sp = (volatile void **)(ssize + (char *)sptr);
291 *--ctx->sp = (void *)abort; /* needed for alignment only */
293 *--ctx->sp = (void *)coro_init; 292 *--ctx->sp = (void *)coro_init;
294 *--ctx->sp = (void *)coro_init; // this is needed when the prologue saves ebp
295 ctx->sp -= NUM_CLOBBERED; 293 ctx->sp -= NUM_SAVED;
296 294
297# endif 295# elif CORO_UCONTEXT
298 296
299 coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); 297 getcontext (&(ctx->uc));
300 298
301#else 299 ctx->uc.uc_link = 0;
302# error unsupported architecture 300 ctx->uc.uc_stack.ss_sp = sptr;
301 ctx->uc.uc_stack.ss_size = (size_t)ssize;
302 ctx->uc.uc_stack.ss_flags = 0;
303
304 makecontext (&(ctx->uc), (void (*)())coro_init, 0);
305
306# endif
307
308 coro_transfer (create_coro, new_coro);
309}
310
303#endif 311#endif
304}
305 312
313/*****************************************************************************/
314/* pthread backend */
315/*****************************************************************************/
316
317#if CORO_PTHREAD
318
319/* this mutex will be locked by the running coroutine */
320pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER;
321
322struct coro_init_args
323{
324 coro_func func;
325 void *arg;
326 coro_context *self, *main;
327};
328
329static pthread_t null_tid;
330
331/* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */
332static void
333mutex_unlock_wrapper (void *arg)
334{
335 pthread_mutex_unlock ((pthread_mutex_t *)arg);
336}
337
338static void *
339coro_init (void *args_)
340{
341 struct coro_init_args *args = (struct coro_init_args *)args_;
342 coro_func func = args->func;
343 void *arg = args->arg;
344
345 pthread_mutex_lock (&coro_mutex);
346
347 /* we try to be good citizens and use deferred cancellation and cleanup handlers */
348 pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex);
349 coro_transfer (args->self, args->main);
350 func (arg);
351 pthread_cleanup_pop (1);
352
353 return 0;
354}
355
356void
357coro_transfer (coro_context *prev, coro_context *next)
358{
359 pthread_cond_signal (&next->cv);
360 pthread_cond_wait (&prev->cv, &coro_mutex);
361}
362
363void
364coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize)
365{
366 static coro_context nctx;
367 static int once;
368
369 if (!once)
370 {
371 once = 1;
372
373 pthread_mutex_lock (&coro_mutex);
374 pthread_cond_init (&nctx.cv, 0);
375 null_tid = pthread_self ();
376 }
377
378 pthread_cond_init (&ctx->cv, 0);
379
380 if (coro)
381 {
382 pthread_attr_t attr;
383 struct coro_init_args args;
384
385 args.func = coro;
386 args.arg = arg;
387 args.self = ctx;
388 args.main = &nctx;
389
390 pthread_attr_init (&attr);
391 pthread_attr_setstack (&attr, sptr, (size_t)ssize);
392 pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS);
393 pthread_create (&ctx->id, &attr, coro_init, &args);
394
395 coro_transfer (args.main, args.self);
396 }
397 else
398 ctx->id = null_tid;
399}
400
401void
402coro_destroy (coro_context *ctx)
403{
404 if (!pthread_equal (ctx->id, null_tid))
405 {
406 pthread_cancel (ctx->id);
407 pthread_mutex_unlock (&coro_mutex);
408 pthread_join (ctx->id, 0);
409 pthread_mutex_lock (&coro_mutex);
410 }
411
412 pthread_cond_destroy (&ctx->cv);
413}
414
415#endif
416

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