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) || (_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 | |
74 | static volatile coro_func coro_init_func; |
79 | static coro_func coro_init_func; |
75 | static volatile void *coro_init_arg; |
80 | static void *coro_init_arg; |
76 | static volatile coro_context *new_coro, *create_coro; |
81 | static 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 | |
84 | static void |
83 | static void |
85 | coro_init (void) |
84 | coro_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 | |
100 | static volatile int trampoline_count; |
99 | static volatile int trampoline_done; |
101 | |
100 | |
102 | /* trampoline signal handler */ |
101 | /* trampoline signal handler */ |
103 | static void |
102 | static void |
104 | trampoline (int sig) |
103 | trampoline (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 |
|
|
114 | |
125 | asm ( |
115 | asm ( |
126 | ".text\n" |
116 | ".text\n" |
127 | ".globl coro_transfer\n" |
117 | ".globl coro_transfer\n" |
128 | ".type coro_transfer, @function\n" |
118 | ".type coro_transfer, @function\n" |
129 | "coro_transfer:\n" |
119 | "coro_transfer:\n" |
130 | #if __amd64 |
120 | #if __amd64 |
131 | # define NUM_SAVED 6 |
121 | #define NUM_SAVED 6 |
132 | "\tpush %rbp\n" |
122 | "\tpush %rbp\n" |
133 | "\tpush %rbx\n" |
123 | "\tpush %rbx\n" |
134 | "\tpush %r12\n" |
124 | "\tpush %r12\n" |
135 | "\tpush %r13\n" |
125 | "\tpush %r13\n" |
136 | "\tpush %r14\n" |
126 | "\tpush %r14\n" |
137 | "\tpush %r15\n" |
127 | "\tpush %r15\n" |
138 | "\tmov %rsp, (%rdi)\n" |
128 | "\tmov %rsp, (%rdi)\n" |
139 | "\tmov (%rsi), %rsp\n" |
129 | "\tmov (%rsi), %rsp\n" |
140 | "\tpop %r15\n" |
130 | "\tpop %r15\n" |
141 | "\tpop %r14\n" |
131 | "\tpop %r14\n" |
142 | "\tpop %r13\n" |
132 | "\tpop %r13\n" |
143 | "\tpop %r12\n" |
133 | "\tpop %r12\n" |
144 | "\tpop %rbx\n" |
134 | "\tpop %rbx\n" |
145 | "\tpop %rbp\n" |
135 | "\tpop %rbp\n" |
146 | #elif __i386 |
136 | #elif __i386 |
147 | # define NUM_SAVED 4 |
137 | #define NUM_SAVED 4 |
148 | "\tpush %ebp\n" |
138 | "\tpush %ebp\n" |
149 | "\tpush %ebx\n" |
139 | "\tpush %ebx\n" |
150 | "\tpush %esi\n" |
140 | "\tpush %esi\n" |
151 | "\tpush %edi\n" |
141 | "\tpush %edi\n" |
152 | "\tmov %esp, (%eax)\n" |
142 | "\tmov %esp, (%eax)\n" |
153 | "\tmov (%edx), %esp\n" |
143 | "\tmov (%edx), %esp\n" |
154 | "\tpop %edi\n" |
144 | "\tpop %edi\n" |
155 | "\tpop %esi\n" |
145 | "\tpop %esi\n" |
156 | "\tpop %ebx\n" |
146 | "\tpop %ebx\n" |
157 | "\tpop %ebp\n" |
147 | "\tpop %ebp\n" |
158 | #else |
148 | #else |
159 | # error unsupported architecture |
149 | #error unsupported architecture |
160 | #endif |
150 | #endif |
161 | "\tret\n" |
151 | "\tret\n" |
162 | ); |
152 | ); |
|
|
153 | |
163 | #endif |
154 | # endif |
164 | |
155 | |
165 | #if CORO_PTHREAD |
156 | void |
166 | |
157 | coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
167 | struct coro_init_args { |
|
|
168 | coro_func func; |
|
|
169 | void *arg; |
|
|
170 | coro_context *self, *main; |
|
|
171 | }; |
|
|
172 | |
|
|
173 | pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; |
|
|
174 | |
|
|
175 | static void * |
|
|
176 | trampoline (void *args_) |
|
|
177 | { |
158 | { |
178 | struct coro_init_args *args = (struct coro_init_args *)args_; |
159 | coro_context nctx; |
179 | coro_func func = args->func; |
|
|
180 | void *arg = args->arg; |
|
|
181 | |
|
|
182 | pthread_mutex_lock (&coro_mutex); |
|
|
183 | pthread_cond_destroy (&args->self->c); |
|
|
184 | coro_transfer (args->self, args->main); |
|
|
185 | func (arg); |
|
|
186 | pthread_mutex_unlock (&coro_mutex); |
|
|
187 | |
|
|
188 | return 0; |
|
|
189 | } |
|
|
190 | |
|
|
191 | asm(""); |
|
|
192 | |
|
|
193 | void coro_transfer(coro_context *prev, coro_context *next) |
|
|
194 | { |
|
|
195 | pthread_cond_init (&prev->c, 0); |
|
|
196 | pthread_cond_signal (&next->c); |
|
|
197 | pthread_cond_wait (&prev->c, &coro_mutex); |
|
|
198 | pthread_cond_destroy (&prev->c); |
|
|
199 | } |
|
|
200 | |
|
|
201 | #endif |
|
|
202 | |
|
|
203 | /* initialize a machine state */ |
|
|
204 | void coro_create (coro_context *ctx, |
|
|
205 | coro_func coro, void *arg, |
|
|
206 | void *sptr, long ssize) |
|
|
207 | { |
|
|
208 | #if CORO_UCONTEXT |
|
|
209 | |
|
|
210 | getcontext (&(ctx->uc)); |
|
|
211 | |
|
|
212 | ctx->uc.uc_link = 0; |
|
|
213 | ctx->uc.uc_stack.ss_sp = STACK_ADJUST_PTR (sptr,ssize); |
|
|
214 | ctx->uc.uc_stack.ss_size = (size_t)STACK_ADJUST_SIZE (sptr,ssize); |
|
|
215 | ctx->uc.uc_stack.ss_flags = 0; |
|
|
216 | |
|
|
217 | makecontext (&(ctx->uc), (void (*)()) coro, 1, arg); |
|
|
218 | |
|
|
219 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX || CORO_ASM |
|
|
220 | |
|
|
221 | # if CORO_SJLJ |
160 | # if CORO_SJLJ |
222 | stack_t ostk, nstk; |
161 | stack_t ostk, nstk; |
223 | struct sigaction osa, nsa; |
162 | struct sigaction osa, nsa; |
224 | sigset_t nsig, osig; |
163 | sigset_t nsig, osig; |
225 | # endif |
164 | # endif |
226 | coro_context nctx; |
165 | |
|
|
166 | if (!coro) |
|
|
167 | return; |
227 | |
168 | |
228 | coro_init_func = coro; |
169 | coro_init_func = coro; |
229 | coro_init_arg = arg; |
170 | coro_init_arg = arg; |
230 | |
171 | |
231 | new_coro = ctx; |
172 | new_coro = ctx; |
… | |
… | |
257 | { |
198 | { |
258 | perror ("sigaltstack"); |
199 | perror ("sigaltstack"); |
259 | abort (); |
200 | abort (); |
260 | } |
201 | } |
261 | |
202 | |
262 | trampoline_count = 0; |
203 | trampoline_done = 0; |
263 | kill (getpid (), SIGUSR2); |
204 | kill (getpid (), SIGUSR2); |
264 | sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
205 | sigfillset (&nsig); sigdelset (&nsig, SIGUSR2); |
265 | |
206 | |
266 | while (!trampoline_count) |
207 | while (!trampoline_done) |
267 | sigsuspend (&nsig); |
208 | sigsuspend (&nsig); |
268 | |
209 | |
269 | sigaltstack (0, &nstk); |
210 | sigaltstack (0, &nstk); |
270 | nstk.ss_flags = SS_DISABLE; |
211 | nstk.ss_flags = SS_DISABLE; |
271 | if (sigaltstack (&nstk, 0) < 0) |
212 | if (sigaltstack (&nstk, 0) < 0) |
… | |
… | |
277 | |
218 | |
278 | if (~ostk.ss_flags & SS_DISABLE) |
219 | if (~ostk.ss_flags & SS_DISABLE) |
279 | sigaltstack (&ostk, 0); |
220 | sigaltstack (&ostk, 0); |
280 | |
221 | |
281 | sigaction (SIGUSR2, &osa, 0); |
222 | sigaction (SIGUSR2, &osa, 0); |
282 | |
|
|
283 | sigprocmask (SIG_SETMASK, &osig, 0); |
223 | sigprocmask (SIG_SETMASK, &osig, 0); |
284 | |
224 | |
285 | # elif CORO_LOSER |
225 | # elif CORO_LOSER |
286 | |
226 | |
287 | setjmp (ctx->env); |
227 | coro_setjmp (ctx->env); |
288 | #if __CYGWIN__ |
228 | #if __CYGWIN__ && __i386 |
|
|
229 | ctx->env[8] = (long) coro_init; |
289 | ctx->env[7] = (long)((char *)sptr + ssize) - sizeof (long); |
230 | ctx->env[7] = (long) ((char *)sptr + ssize) - sizeof (long); |
290 | ctx->env[8] = (long)coro_init; |
231 | #elif __CYGWIN__ && __x86_64 |
|
|
232 | ctx->env[7] = (long) coro_init; |
|
|
233 | ctx->env[6] = (long) ((char *)sptr + ssize) - sizeof (long); |
|
|
234 | #elif defined(__MINGW32__) |
|
|
235 | ctx->env[5] = (long) coro_init; |
|
|
236 | ctx->env[4] = (long) ((char *)sptr + ssize) - sizeof (long); |
291 | #elif defined(_M_IX86) |
237 | #elif defined(_M_IX86) |
292 | ((_JUMP_BUFFER *)&ctx->env)->Eip = (long)coro_init; |
238 | ((_JUMP_BUFFER *)&ctx->env)->Eip = (long) coro_init; |
293 | ((_JUMP_BUFFER *)&ctx->env)->Esp = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
239 | ((_JUMP_BUFFER *)&ctx->env)->Esp = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
294 | #elif defined(_M_AMD64) |
240 | #elif defined(_M_AMD64) |
295 | ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64)coro_init; |
241 | ((_JUMP_BUFFER *)&ctx->env)->Rip = (__int64) coro_init; |
296 | ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
242 | ((_JUMP_BUFFER *)&ctx->env)->Rsp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
297 | #elif defined(_M_IA64) |
243 | #elif defined(_M_IA64) |
298 | ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64)coro_init; |
244 | ((_JUMP_BUFFER *)&ctx->env)->StIIP = (__int64) coro_init; |
299 | ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
245 | ((_JUMP_BUFFER *)&ctx->env)->IntSp = (__int64) STACK_ADJUST_PTR (sptr, ssize) - sizeof (__int64); |
300 | #else |
246 | #else |
301 | # error "microsoft libc or architecture not supported" |
247 | #error "microsoft libc or architecture not supported" |
302 | #endif |
248 | #endif |
303 | |
249 | |
304 | # elif CORO_LINUX |
250 | # elif CORO_LINUX |
305 | |
251 | |
306 | _setjmp (ctx->env); |
252 | coro_setjmp (ctx->env); |
307 | #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
253 | #if __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (JB_PC) && defined (JB_SP) |
308 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
254 | ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
309 | ctx->env[0].__jmpbuf[JB_SP] = (long)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
255 | ctx->env[0].__jmpbuf[JB_SP] = (long) STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
310 | #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
256 | #elif __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 0 && defined (__mc68000__) |
311 | ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
257 | ctx->env[0].__jmpbuf[0].__aregs[0] = (long int)coro_init; |
312 | ctx->env[0].__jmpbuf[0].__sp = (int *)((char *)sptr + ssize) - sizeof (long); |
258 | ctx->env[0].__jmpbuf[0].__sp = (int *) ((char *)sptr + ssize) - sizeof (long); |
313 | #elif defined (__GNU_LIBRARY__) && defined (__i386__) |
259 | #elif defined (__GNU_LIBRARY__) && defined (__i386__) |
314 | ctx->env[0].__jmpbuf[0].__pc = (char *)coro_init; |
260 | ctx->env[0].__jmpbuf[0].__pc = (char *) coro_init; |
315 | ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long); |
261 | ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
316 | #elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
262 | #elif defined (__GNU_LIBRARY__) && defined (__amd64__) |
317 | ctx->env[0].__jmpbuf[JB_PC] = (long)coro_init; |
263 | ctx->env[0].__jmpbuf[JB_PC] = (long) coro_init; |
318 | ctx->env[0].__jmpbuf[0].__sp = (void *)((char *)sptr + ssize) - sizeof (long); |
264 | ctx->env[0].__jmpbuf[0].__sp = (void *) ((char *)sptr + ssize) - sizeof (long); |
319 | #else |
265 | #else |
320 | # error "linux libc or architecture not supported" |
266 | #error "linux libc or architecture not supported" |
321 | #endif |
267 | #endif |
322 | |
268 | |
323 | # elif CORO_IRIX |
269 | # elif CORO_IRIX |
324 | |
270 | |
325 | setjmp (ctx->env); |
271 | coro_setjmp (ctx->env, 0); |
326 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
272 | ctx->env[JB_PC] = (__uint64_t)coro_init; |
327 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
273 | ctx->env[JB_SP] = (__uint64_t)STACK_ADJUST_PTR (sptr, ssize) - sizeof (long); |
328 | |
274 | |
329 | # elif CORO_ASM |
275 | # elif CORO_ASM |
330 | |
276 | |
331 | ctx->sp = (volatile void **)(ssize + (char *)sptr); |
277 | ctx->sp = (void **)(ssize + (char *)sptr); |
332 | *--ctx->sp = (void *)abort; /* needed for alignment only */ |
278 | *--ctx->sp = (void *)abort; /* needed for alignment only */ |
333 | *--ctx->sp = (void *)coro_init; |
279 | *--ctx->sp = (void *)coro_init; |
334 | ctx->sp -= NUM_SAVED; |
280 | ctx->sp -= NUM_SAVED; |
335 | |
281 | |
336 | # endif |
282 | # elif CORO_UCONTEXT |
337 | |
283 | |
338 | coro_transfer ((coro_context *)create_coro, (coro_context *)new_coro); |
284 | getcontext (&(ctx->uc)); |
339 | |
285 | |
|
|
286 | ctx->uc.uc_link = 0; |
|
|
287 | ctx->uc.uc_stack.ss_sp = sptr; |
|
|
288 | ctx->uc.uc_stack.ss_size = (size_t)ssize; |
|
|
289 | ctx->uc.uc_stack.ss_flags = 0; |
|
|
290 | |
|
|
291 | makecontext (&(ctx->uc), (void (*)())coro_init, 0); |
|
|
292 | |
|
|
293 | # endif |
|
|
294 | |
|
|
295 | coro_transfer (create_coro, new_coro); |
|
|
296 | } |
|
|
297 | |
|
|
298 | /*****************************************************************************/ |
|
|
299 | /* pthread backend */ |
|
|
300 | /*****************************************************************************/ |
340 | # elif CORO_PTHREAD |
301 | #elif CORO_PTHREAD |
341 | |
302 | |
342 | pthread_t id; |
303 | /* this mutex will be locked by the running coroutine */ |
343 | pthread_attr_t attr; |
304 | pthread_mutex_t coro_mutex = PTHREAD_MUTEX_INITIALIZER; |
|
|
305 | |
|
|
306 | struct coro_init_args |
|
|
307 | { |
|
|
308 | coro_func func; |
|
|
309 | void *arg; |
|
|
310 | coro_context *self, *main; |
|
|
311 | }; |
|
|
312 | |
|
|
313 | static pthread_t null_tid; |
|
|
314 | |
|
|
315 | /* I'd so love to cast pthread_mutex_unlock to void (*)(void *)... */ |
|
|
316 | static void |
|
|
317 | mutex_unlock_wrapper (void *arg) |
|
|
318 | { |
|
|
319 | pthread_mutex_unlock ((pthread_mutex_t *)arg); |
|
|
320 | } |
|
|
321 | |
|
|
322 | static void * |
|
|
323 | coro_init (void *args_) |
|
|
324 | { |
|
|
325 | struct coro_init_args *args = (struct coro_init_args *)args_; |
|
|
326 | coro_func func = args->func; |
|
|
327 | void *arg = args->arg; |
|
|
328 | |
|
|
329 | pthread_mutex_lock (&coro_mutex); |
|
|
330 | |
|
|
331 | /* we try to be good citizens and use deferred cancellation and cleanup handlers */ |
|
|
332 | pthread_cleanup_push (mutex_unlock_wrapper, &coro_mutex); |
|
|
333 | coro_transfer (args->self, args->main); |
|
|
334 | func (arg); |
|
|
335 | pthread_cleanup_pop (1); |
|
|
336 | |
|
|
337 | return 0; |
|
|
338 | } |
|
|
339 | |
|
|
340 | void |
|
|
341 | coro_transfer (coro_context *prev, coro_context *next) |
|
|
342 | { |
|
|
343 | pthread_cond_signal (&next->cv); |
|
|
344 | pthread_cond_wait (&prev->cv, &coro_mutex); |
|
|
345 | #if __FreeBSD__ /* freebsd is of course broken and needs manual testcancel calls... yay... */ |
|
|
346 | pthread_testcancel (); |
|
|
347 | #endif |
|
|
348 | } |
|
|
349 | |
|
|
350 | void |
|
|
351 | coro_create (coro_context *ctx, coro_func coro, void *arg, void *sptr, long ssize) |
|
|
352 | { |
344 | coro_context nctx; |
353 | static coro_context nctx; |
345 | struct coro_init_args args; |
|
|
346 | static int once; |
354 | static int once; |
347 | |
355 | |
348 | if (!once) |
356 | if (!once) |
349 | { |
357 | { |
|
|
358 | once = 1; |
|
|
359 | |
350 | pthread_mutex_lock (&coro_mutex); |
360 | pthread_mutex_lock (&coro_mutex); |
351 | once = 1; |
361 | pthread_cond_init (&nctx.cv, 0); |
|
|
362 | null_tid = pthread_self (); |
352 | } |
363 | } |
353 | |
364 | |
|
|
365 | pthread_cond_init (&ctx->cv, 0); |
|
|
366 | |
|
|
367 | if (coro) |
|
|
368 | { |
|
|
369 | pthread_attr_t attr; |
|
|
370 | struct coro_init_args args; |
|
|
371 | |
354 | args.func = coro; |
372 | args.func = coro; |
355 | args.arg = arg; |
373 | args.arg = arg; |
356 | args.self = ctx; |
374 | args.self = ctx; |
357 | args.main = &nctx; |
375 | args.main = &nctx; |
358 | |
376 | |
359 | pthread_attr_init (&attr); |
377 | pthread_attr_init (&attr); |
360 | pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED); |
|
|
361 | pthread_attr_setstack (&attr, sptr, (size_t)ssize); |
378 | pthread_attr_setstack (&attr, sptr, (size_t)ssize); |
|
|
379 | pthread_attr_setscope (&attr, PTHREAD_SCOPE_PROCESS); |
362 | pthread_create (&id, &attr, trampoline, &args); |
380 | pthread_create (&ctx->id, &attr, coro_init, &args); |
363 | |
381 | |
364 | pthread_cond_init (&args.self->c, 0); |
|
|
365 | coro_transfer (args.main, args.self); |
382 | coro_transfer (args.main, args.self); |
|
|
383 | } |
|
|
384 | else |
|
|
385 | ctx->id = null_tid; |
|
|
386 | } |
|
|
387 | |
|
|
388 | void |
|
|
389 | coro_destroy (coro_context *ctx) |
|
|
390 | { |
|
|
391 | if (!pthread_equal (ctx->id, null_tid)) |
|
|
392 | { |
|
|
393 | pthread_cancel (ctx->id); |
|
|
394 | pthread_mutex_unlock (&coro_mutex); |
|
|
395 | pthread_join (ctx->id, 0); |
|
|
396 | pthread_mutex_lock (&coro_mutex); |
|
|
397 | } |
|
|
398 | |
|
|
399 | pthread_cond_destroy (&ctx->cv); |
|
|
400 | } |
366 | |
401 | |
367 | #else |
402 | #else |
368 | # error unsupported backend |
403 | # error unsupported backend |
369 | #endif |
404 | #endif |
370 | } |
|
|
371 | |
405 | |