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55 | * 2008-03-02 Switched to 2-clause BSD license with GPL exception. |
55 | * 2008-03-02 Switched to 2-clause BSD license with GPL exception. |
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. |
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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. |
60 | */ |
69 | */ |
61 | |
70 | |
62 | #ifndef CORO_H |
71 | #ifndef CORO_H |
63 | #define CORO_H |
72 | #define CORO_H |
64 | |
73 | |
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135 | /* |
144 | /* |
136 | * 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 |
137 | * uninitialised coro_context, it expects a pointer to the entry function |
146 | * uninitialised coro_context, it expects a pointer to the entry function |
138 | * 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. |
139 | * |
148 | * |
140 | * Allocating/deallocating the stack is your own responsibility, so there is |
149 | * Allocating/deallocating the stack is your own responsibility. |
141 | * 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_context 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. |
142 | */ |
157 | */ |
143 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
158 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
144 | coro_func coro, /* the coroutine code to be executed */ |
159 | coro_func coro, /* the coroutine code to be executed */ |
145 | void *arg, /* a single pointer passed to the coro */ |
160 | void *arg, /* a single pointer passed to the coro */ |
146 | void *sptr, /* start of stack area */ |
161 | void *sptr, /* start of stack area */ |
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148 | |
163 | |
149 | /* |
164 | /* |
150 | * The following prototype defines the coroutine switching function. It is |
165 | * The following prototype defines the coroutine switching function. It is |
151 | * usually implemented as a macro, so watch out. |
166 | * usually implemented as a macro, so watch out. |
152 | * |
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 |
153 | 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, |
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178 | * where it is used to clean up the thread. You are responsible |
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179 | * for freeing the stack and the context itself. |
154 | */ |
180 | * |
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181 | * This function is thread-safe and reentrant. |
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182 | */ |
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183 | #if 0 |
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184 | void coro_destroy (coro_context *ctx); |
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185 | #endif |
155 | |
186 | |
156 | /* |
187 | /* |
157 | * That was it. No other user-visible functions are implemented here. |
188 | * That was it. No other user-visible functions are implemented here. |
158 | */ |
189 | */ |
159 | |
190 | |
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185 | struct coro_context { |
216 | struct coro_context { |
186 | ucontext_t uc; |
217 | ucontext_t uc; |
187 | }; |
218 | }; |
188 | |
219 | |
189 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
220 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
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221 | # define coro_destroy(ctx) (void *)(ctx) |
190 | |
222 | |
191 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
223 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
192 | |
224 | |
193 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
225 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
194 | # define _GNU_SOURCE /* for linux libc */ |
226 | # define _GNU_SOURCE /* for linux libc */ |
195 | # endif |
227 | # endif |
196 | |
228 | |
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229 | # if !CORO_LOSER |
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230 | # include <unistd.h> |
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231 | # endif |
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232 | |
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233 | /* solaris is hopelessly borked, it expands _XOPEN_UNIX to nothing */ |
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234 | # if __sun |
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235 | # undef _XOPEN_UNIX |
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236 | # define _XOPEN_UNIX 1 |
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237 | # endif |
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238 | |
197 | # include <setjmp.h> |
239 | # include <setjmp.h> |
198 | |
240 | |
199 | struct coro_context { |
241 | struct coro_context { |
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242 | #if _XOPEN_UNIX > 0 || CORO_LOSER |
200 | jmp_buf env; |
243 | jmp_buf env; |
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244 | #else |
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245 | sigjmp_buf env; |
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246 | #endif |
201 | }; |
247 | }; |
202 | |
248 | |
203 | # if CORO_LINUX || (_XOPEN_SOURCE >= 600) |
249 | # if _XOPEN_UNIX > 0 |
204 | # define coro_transfer(p,n) do { if (!_setjmp ((p)->env)) _longjmp ((n)->env, 1); } while (0) |
250 | # define coro_transfer(p,n) do { if (! _setjmp ((p)->env )) _longjmp ((n)->env, 1); } while (0) |
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251 | # elif CORO_LOSER |
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252 | # define coro_transfer(p,n) do { if (! setjmp ((p)->env )) longjmp ((n)->env, 1); } while (0) |
205 | # else |
253 | # else |
206 | # define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0) |
254 | # define coro_transfer(p,n) do { if (!sigsetjmp ((p)->env, 0)) siglongjmp ((n)->env, 1); } while (0) |
207 | # endif |
255 | # endif |
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256 | |
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257 | # define coro_destroy(ctx) (void *)(ctx) |
208 | |
258 | |
209 | #elif CORO_ASM |
259 | #elif CORO_ASM |
210 | |
260 | |
211 | struct coro_context { |
261 | struct coro_context { |
212 | volatile void **sp; /* must be at offset 0 */ |
262 | void **sp; /* must be at offset 0 */ |
213 | }; |
263 | }; |
214 | |
264 | |
215 | void __attribute__ ((__noinline__, __regparm__(2))) |
265 | void __attribute__ ((__noinline__, __regparm__(2))) |
216 | coro_transfer (coro_context *prev, coro_context *next); |
266 | coro_transfer (coro_context *prev, coro_context *next); |
217 | |
267 | |
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268 | # define coro_destroy(ctx) (void *)(ctx) |
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269 | |
218 | #elif CORO_PTHREAD |
270 | #elif CORO_PTHREAD |
219 | |
271 | |
220 | #include <pthread.h> |
272 | # include <pthread.h> |
221 | |
273 | |
222 | extern pthread_mutex_t coro_mutex; |
274 | extern pthread_mutex_t coro_mutex; |
223 | |
275 | |
224 | struct coro_context { |
276 | struct coro_context { |
225 | pthread_cond_t c; |
277 | pthread_cond_t cv; |
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278 | pthread_t id; |
226 | }; |
279 | }; |
227 | |
280 | |
228 | void coro_transfer (coro_context *prev, coro_context *next); |
281 | void coro_transfer (coro_context *prev, coro_context *next); |
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282 | void coro_destroy (coro_context *ctx); |
229 | |
283 | |
230 | #endif |
284 | #endif |
231 | |
285 | |
232 | #endif |
286 | #endif |
233 | |
287 | |