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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. |
62 | */ |
65 | */ |
63 | |
66 | |
64 | #ifndef CORO_H |
67 | #ifndef CORO_H |
65 | #define CORO_H |
68 | #define CORO_H |
66 | |
69 | |
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137 | /* |
140 | /* |
138 | * This function creates a new coroutine. Apart from a pointer to an |
141 | * This function creates a new coroutine. Apart from a pointer to an |
139 | * uninitialised coro_context, it expects a pointer to the entry function |
142 | * uninitialised coro_context, it expects a pointer to the entry function |
140 | * and the single pointer value that is given to it as argument. |
143 | * and the single pointer value that is given to it as argument. |
141 | * |
144 | * |
142 | * Allocating/deallocating the stack is your own responsibility, so there is |
145 | * Allocating/deallocating the stack is your own responsibility. |
143 | * no coro_destroy function. |
146 | * |
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147 | * As a special case, if coro, arg, sptr and ssize are all zero, |
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148 | * then an "empty" coro_contetx will be created that is suitable |
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149 | * as an initial source for coro_transfer. |
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150 | * |
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151 | * This function is not reentrant, but putting a mutex around it |
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152 | * will work. |
144 | */ |
153 | */ |
145 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
154 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
146 | coro_func coro, /* the coroutine code to be executed */ |
155 | coro_func coro, /* the coroutine code to be executed */ |
147 | void *arg, /* a single pointer passed to the coro */ |
156 | void *arg, /* a single pointer passed to the coro */ |
148 | void *sptr, /* start of stack area */ |
157 | void *sptr, /* start of stack area */ |
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150 | |
159 | |
151 | /* |
160 | /* |
152 | * The following prototype defines the coroutine switching function. It is |
161 | * The following prototype defines the coroutine switching function. It is |
153 | * usually implemented as a macro, so watch out. |
162 | * usually implemented as a macro, so watch out. |
154 | * |
163 | * |
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164 | * This function is thread-safe and reentrant. |
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165 | */ |
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166 | #if 0 |
155 | void coro_transfer(coro_context *prev, coro_context *next); |
167 | void coro_transfer (coro_context *prev, coro_context *next); |
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168 | #endif |
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169 | |
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170 | /* |
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171 | * The following prototype defines the coroutine destroy function. It is |
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172 | * usually implemented as a macro, so watch out. It also serves |
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173 | * no purpose unless you want to use the CORO_PTHREAD backend. |
156 | */ |
174 | * |
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175 | * This function is thread-safe and reentrant. |
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176 | */ |
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177 | #if 0 |
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178 | void coro_destroy (coro_context *ctx); |
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179 | #endif |
157 | |
180 | |
158 | /* |
181 | /* |
159 | * That was it. No other user-visible functions are implemented here. |
182 | * That was it. No other user-visible functions are implemented here. |
160 | */ |
183 | */ |
161 | |
184 | |
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187 | struct coro_context { |
210 | struct coro_context { |
188 | ucontext_t uc; |
211 | ucontext_t uc; |
189 | }; |
212 | }; |
190 | |
213 | |
191 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
214 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
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215 | # define coro_destroy(ctx) (void *)(ctx) |
192 | |
216 | |
193 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
217 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
194 | |
218 | |
195 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
219 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
196 | # define _GNU_SOURCE /* for linux libc */ |
220 | # define _GNU_SOURCE /* for linux libc */ |
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206 | # define coro_transfer(p,n) do { if (!_setjmp ((p)->env)) _longjmp ((n)->env, 1); } while (0) |
230 | # define coro_transfer(p,n) do { if (!_setjmp ((p)->env)) _longjmp ((n)->env, 1); } while (0) |
207 | # else |
231 | # else |
208 | # define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0) |
232 | # define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0) |
209 | # endif |
233 | # endif |
210 | |
234 | |
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235 | # define coro_destroy(ctx) (void *)(ctx) |
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236 | |
211 | #elif CORO_ASM |
237 | #elif CORO_ASM |
212 | |
238 | |
213 | struct coro_context { |
239 | struct coro_context { |
214 | volatile void **sp; /* must be at offset 0 */ |
240 | volatile void **sp; /* must be at offset 0 */ |
215 | }; |
241 | }; |
216 | |
242 | |
217 | void __attribute__ ((__noinline__, __regparm__(2))) |
243 | void __attribute__ ((__noinline__, __regparm__(2))) |
218 | coro_transfer (coro_context *prev, coro_context *next); |
244 | coro_transfer (coro_context *prev, coro_context *next); |
219 | |
245 | |
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246 | # define coro_destroy(ctx) (void *)(ctx) |
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247 | |
220 | #elif CORO_PTHREAD |
248 | #elif CORO_PTHREAD |
221 | |
249 | |
222 | #include <pthread.h> |
250 | # include <pthread.h> |
223 | |
251 | |
224 | extern pthread_mutex_t coro_mutex; |
252 | extern pthread_mutex_t coro_mutex; |
225 | |
253 | |
226 | struct coro_context { |
254 | struct coro_context { |
227 | pthread_cond_t c; |
255 | pthread_cond_t cv; |
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256 | pthread_t id; |
228 | }; |
257 | }; |
229 | |
258 | |
230 | void coro_transfer (coro_context *prev, coro_context *next); |
259 | void coro_transfer (coro_context *prev, coro_context *next); |
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260 | void coro_destroy (coro_context *ctx); |
231 | |
261 | |
232 | #endif |
262 | #endif |
233 | |
263 | |
234 | #endif |
264 | #endif |
235 | |
265 | |