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56 | * 2008-04-04 New (but highly unrecommended) pthreads backend. |
56 | * 2008-04-04 New (but highly unrecommended) pthreads backend. |
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. |
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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. |
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68 | * 2008-11-10 the .cfi hacks are no longer needed. |
61 | */ |
69 | */ |
62 | |
70 | |
63 | #ifndef CORO_H |
71 | #ifndef CORO_H |
64 | #define CORO_H |
72 | #define CORO_H |
65 | |
73 | |
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136 | /* |
144 | /* |
137 | * This function creates a new coroutine. Apart from a pointer to an |
145 | * This function creates a new coroutine. Apart from a pointer to an |
138 | * uninitialised coro_context, it expects a pointer to the entry function |
146 | * uninitialised coro_context, it expects a pointer to the entry function |
139 | * and the single pointer value that is given to it as argument. |
147 | * and the single pointer value that is given to it as argument. |
140 | * |
148 | * |
141 | * Allocating/deallocating the stack is your own responsibility, so there is |
149 | * Allocating/deallocating the stack is your own responsibility. |
142 | * no coro_destroy function. |
150 | * |
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151 | * As a special case, if coro, arg, sptr and ssize are all zero, |
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152 | * then an "empty" coro_contetx will be created that is suitable |
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153 | * as an initial source for coro_transfer. |
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154 | * |
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155 | * This function is not reentrant, but putting a mutex around it |
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156 | * will work. |
143 | */ |
157 | */ |
144 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
158 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
145 | coro_func coro, /* the coroutine code to be executed */ |
159 | coro_func coro, /* the coroutine code to be executed */ |
146 | void *arg, /* a single pointer passed to the coro */ |
160 | void *arg, /* a single pointer passed to the coro */ |
147 | void *sptr, /* start of stack area */ |
161 | void *sptr, /* start of stack area */ |
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149 | |
163 | |
150 | /* |
164 | /* |
151 | * The following prototype defines the coroutine switching function. It is |
165 | * The following prototype defines the coroutine switching function. It is |
152 | * usually implemented as a macro, so watch out. |
166 | * usually implemented as a macro, so watch out. |
153 | * |
167 | * |
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168 | * This function is thread-safe and reentrant. |
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169 | */ |
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170 | #if 0 |
154 | void coro_transfer(coro_context *prev, coro_context *next); |
171 | void coro_transfer (coro_context *prev, coro_context *next); |
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172 | #endif |
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173 | |
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174 | /* |
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175 | * The following prototype defines the coroutine destroy function. It is |
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176 | * usually implemented as a macro, so watch out. It also serves |
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177 | * no purpose unless you want to use the CORO_PTHREAD backend. |
155 | */ |
178 | * |
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179 | * This function is thread-safe and reentrant. |
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180 | */ |
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181 | #if 0 |
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182 | void coro_destroy (coro_context *ctx); |
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183 | #endif |
156 | |
184 | |
157 | /* |
185 | /* |
158 | * That was it. No other user-visible functions are implemented here. |
186 | * That was it. No other user-visible functions are implemented here. |
159 | */ |
187 | */ |
160 | |
188 | |
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186 | struct coro_context { |
214 | struct coro_context { |
187 | ucontext_t uc; |
215 | ucontext_t uc; |
188 | }; |
216 | }; |
189 | |
217 | |
190 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
218 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
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219 | # define coro_destroy(ctx) (void *)(ctx) |
191 | |
220 | |
192 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
221 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
193 | |
222 | |
194 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
223 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
195 | # define _GNU_SOURCE /* for linux libc */ |
224 | # define _GNU_SOURCE /* for linux libc */ |
196 | # endif |
225 | # endif |
197 | |
226 | |
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227 | # if !CORO_LOSER |
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228 | # include <unistd.h> |
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229 | # endif |
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230 | |
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231 | /* solaris is hopelessly borked, it expands _XOPEN_UNIX to nothing */ |
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232 | # if __sun |
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233 | # undef _XOPEN_UNIX |
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234 | # define _XOPEN_UNIX 1 |
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235 | # endif |
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236 | |
198 | # include <setjmp.h> |
237 | # include <setjmp.h> |
199 | |
238 | |
200 | struct coro_context { |
239 | struct coro_context { |
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240 | #if _XOPEN_UNIX > 0 || CORO_LOSER |
201 | jmp_buf env; |
241 | jmp_buf env; |
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242 | #else |
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243 | sigjmp_buf env; |
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244 | #endif |
202 | }; |
245 | }; |
203 | |
246 | |
204 | # if CORO_LINUX || (_XOPEN_SOURCE >= 600) |
247 | # if _XOPEN_UNIX > 0 |
205 | # define coro_transfer(p,n) do { if (!_setjmp ((p)->env)) _longjmp ((n)->env, 1); } while (0) |
248 | # define coro_transfer(p,n) do { if (! _setjmp ((p)->env )) _longjmp ((n)->env, 1); } while (0) |
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249 | # elif CORO_LOSER |
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250 | # define coro_transfer(p,n) do { if (! setjmp ((p)->env )) longjmp ((n)->env, 1); } while (0) |
206 | # else |
251 | # else |
207 | # define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0) |
252 | # define coro_transfer(p,n) do { if (!sigsetjmp ((p)->env, 0)) siglongjmp ((n)->env, 1); } while (0) |
208 | # endif |
253 | # endif |
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254 | |
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255 | # define coro_destroy(ctx) (void *)(ctx) |
209 | |
256 | |
210 | #elif CORO_ASM |
257 | #elif CORO_ASM |
211 | |
258 | |
212 | struct coro_context { |
259 | struct coro_context { |
213 | volatile void **sp; /* must be at offset 0 */ |
260 | void **sp; /* must be at offset 0 */ |
214 | }; |
261 | }; |
215 | |
262 | |
216 | void __attribute__ ((__noinline__, __regparm__(2))) |
263 | void __attribute__ ((__noinline__, __regparm__(2))) |
217 | coro_transfer (coro_context *prev, coro_context *next); |
264 | coro_transfer (coro_context *prev, coro_context *next); |
218 | |
265 | |
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266 | # define coro_destroy(ctx) (void *)(ctx) |
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267 | |
219 | #elif CORO_PTHREAD |
268 | #elif CORO_PTHREAD |
220 | |
269 | |
221 | #include <pthread.h> |
270 | # include <pthread.h> |
222 | |
271 | |
223 | extern pthread_mutex_t coro_mutex; |
272 | extern pthread_mutex_t coro_mutex; |
224 | |
273 | |
225 | struct coro_context { |
274 | struct coro_context { |
226 | pthread_cond_t c; |
275 | pthread_cond_t cv; |
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276 | pthread_t id; |
227 | }; |
277 | }; |
228 | |
278 | |
229 | void coro_transfer (coro_context *prev, coro_context *next); |
279 | void coro_transfer (coro_context *prev, coro_context *next); |
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280 | void coro_destroy (coro_context *ctx); |
230 | |
281 | |
231 | #endif |
282 | #endif |
232 | |
283 | |
233 | #endif |
284 | #endif |
234 | |
285 | |