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57 | * 2008-04-24 Reinstate CORO_LOSER (had wrong stack adjustments). |
57 | * 2008-04-24 Reinstate CORO_LOSER (had wrong stack adjustments). |
58 | * 2008-10-30 Support assembly method on x86 with and without frame pointer. |
58 | * 2008-10-30 Support assembly method on x86 with and without frame pointer. |
59 | * 2008-11-03 Use a global asm statement for CORO_ASM, idea by pippijn. |
59 | * 2008-11-03 Use a global asm statement for CORO_ASM, idea by pippijn. |
60 | * 2008-11-05 Hopefully fix misaligned stacks with CORO_ASM/SETJMP. |
60 | * 2008-11-05 Hopefully fix misaligned stacks with CORO_ASM/SETJMP. |
61 | * 2008-11-07 rbp wasn't saved in CORO_ASM on x86_64. |
61 | * 2008-11-07 rbp wasn't saved in CORO_ASM on x86_64. |
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62 | * introduce coro_destroy, which is a nop except for pthreads. |
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63 | * speed up CORO_PTHREAD. Do no longer leak threads either. |
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64 | * coro_create now allows one to create source coro_contexts. |
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65 | * do not rely on makecontext passing a void * correctly. |
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66 | * try harder to get _setjmp/_longjmp. |
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67 | * major code cleanup/restructuring. |
62 | */ |
68 | */ |
63 | |
69 | |
64 | #ifndef CORO_H |
70 | #ifndef CORO_H |
65 | #define CORO_H |
71 | #define CORO_H |
66 | |
72 | |
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137 | /* |
143 | /* |
138 | * This function creates a new coroutine. Apart from a pointer to an |
144 | * This function creates a new coroutine. Apart from a pointer to an |
139 | * uninitialised coro_context, it expects a pointer to the entry function |
145 | * uninitialised coro_context, it expects a pointer to the entry function |
140 | * and the single pointer value that is given to it as argument. |
146 | * and the single pointer value that is given to it as argument. |
141 | * |
147 | * |
142 | * Allocating/deallocating the stack is your own responsibility, so there is |
148 | * Allocating/deallocating the stack is your own responsibility. |
143 | * no coro_destroy function. |
149 | * |
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150 | * As a special case, if coro, arg, sptr and ssize are all zero, |
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151 | * then an "empty" coro_contetx will be created that is suitable |
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152 | * as an initial source for coro_transfer. |
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153 | * |
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154 | * This function is not reentrant, but putting a mutex around it |
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155 | * will work. |
144 | */ |
156 | */ |
145 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
157 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
146 | coro_func coro, /* the coroutine code to be executed */ |
158 | coro_func coro, /* the coroutine code to be executed */ |
147 | void *arg, /* a single pointer passed to the coro */ |
159 | void *arg, /* a single pointer passed to the coro */ |
148 | void *sptr, /* start of stack area */ |
160 | void *sptr, /* start of stack area */ |
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150 | |
162 | |
151 | /* |
163 | /* |
152 | * The following prototype defines the coroutine switching function. It is |
164 | * The following prototype defines the coroutine switching function. It is |
153 | * usually implemented as a macro, so watch out. |
165 | * usually implemented as a macro, so watch out. |
154 | * |
166 | * |
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167 | * This function is thread-safe and reentrant. |
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168 | */ |
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169 | #if 0 |
155 | void coro_transfer(coro_context *prev, coro_context *next); |
170 | void coro_transfer (coro_context *prev, coro_context *next); |
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171 | #endif |
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172 | |
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173 | /* |
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174 | * The following prototype defines the coroutine destroy function. It is |
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175 | * usually implemented as a macro, so watch out. It also serves |
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176 | * no purpose unless you want to use the CORO_PTHREAD backend. |
156 | */ |
177 | * |
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178 | * This function is thread-safe and reentrant. |
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179 | */ |
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180 | #if 0 |
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181 | void coro_destroy (coro_context *ctx); |
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182 | #endif |
157 | |
183 | |
158 | /* |
184 | /* |
159 | * That was it. No other user-visible functions are implemented here. |
185 | * That was it. No other user-visible functions are implemented here. |
160 | */ |
186 | */ |
161 | |
187 | |
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187 | struct coro_context { |
213 | struct coro_context { |
188 | ucontext_t uc; |
214 | ucontext_t uc; |
189 | }; |
215 | }; |
190 | |
216 | |
191 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
217 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
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218 | # define coro_destroy(ctx) (void *)(ctx) |
192 | |
219 | |
193 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
220 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
194 | |
221 | |
195 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
222 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
196 | # define _GNU_SOURCE /* for linux libc */ |
223 | # define _GNU_SOURCE /* for linux libc */ |
197 | # endif |
224 | # endif |
198 | |
225 | |
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226 | # if !CORO_LOSER |
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227 | # include <unistd.h> |
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228 | # endif |
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229 | |
199 | # include <setjmp.h> |
230 | # include <setjmp.h> |
200 | |
231 | |
201 | struct coro_context { |
232 | struct coro_context { |
202 | jmp_buf env; |
233 | jmp_buf env; |
203 | }; |
234 | }; |
204 | |
235 | |
205 | # if CORO_LINUX || (_XOPEN_SOURCE >= 600) |
236 | # if _XOPEN_UNIX > 0 |
206 | # define coro_transfer(p,n) do { if (!_setjmp ((p)->env)) _longjmp ((n)->env, 1); } while (0) |
237 | # define coro_transfer(p,n) do { if (! _setjmp ((p)->env )) _longjmp ((n)->env, 1); } while (0) |
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238 | # elif CORO_LOSER |
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239 | # define coro_transfer(p,n) do { if (! setjmp ((p)->env )) longjmp ((n)->env, 1); } while (0) |
207 | # else |
240 | # else |
208 | # define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0) |
241 | # define coro_transfer(p,n) do { if (!sigsetjmp ((p)->env, 0)) siglongjmp ((n)->env, 1); } while (0) |
209 | # endif |
242 | # endif |
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243 | |
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244 | # define coro_destroy(ctx) (void *)(ctx) |
210 | |
245 | |
211 | #elif CORO_ASM |
246 | #elif CORO_ASM |
212 | |
247 | |
213 | struct coro_context { |
248 | struct coro_context { |
214 | volatile void **sp; /* must be at offset 0 */ |
249 | void **sp; /* must be at offset 0 */ |
215 | }; |
250 | }; |
216 | |
251 | |
217 | void __attribute__ ((__noinline__, __regparm__(2))) |
252 | void __attribute__ ((__noinline__, __regparm__(2))) |
218 | coro_transfer (coro_context *prev, coro_context *next); |
253 | coro_transfer (coro_context *prev, coro_context *next); |
219 | |
254 | |
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255 | # define coro_destroy(ctx) (void *)(ctx) |
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256 | |
220 | #elif CORO_PTHREAD |
257 | #elif CORO_PTHREAD |
221 | |
258 | |
222 | #include <pthread.h> |
259 | # include <pthread.h> |
223 | |
260 | |
224 | extern pthread_mutex_t coro_mutex; |
261 | extern pthread_mutex_t coro_mutex; |
225 | |
262 | |
226 | struct coro_context { |
263 | struct coro_context { |
227 | pthread_cond_t c; |
264 | pthread_cond_t cv; |
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265 | pthread_t id; |
228 | }; |
266 | }; |
229 | |
267 | |
230 | void coro_transfer (coro_context *prev, coro_context *next); |
268 | void coro_transfer (coro_context *prev, coro_context *next); |
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269 | void coro_destroy (coro_context *ctx); |
231 | |
270 | |
232 | #endif |
271 | #endif |
233 | |
272 | |
234 | #endif |
273 | #endif |
235 | |
274 | |