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54 | * 2008-01-21 Disable CFI usage on anything but GNU/Linux. |
54 | * 2008-01-21 Disable CFI usage on anything but GNU/Linux. |
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. |
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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. |
59 | */ |
68 | */ |
60 | |
69 | |
61 | #ifndef CORO_H |
70 | #ifndef CORO_H |
62 | #define CORO_H |
71 | #define CORO_H |
63 | |
72 | |
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134 | /* |
143 | /* |
135 | * 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 |
136 | * uninitialised coro_context, it expects a pointer to the entry function |
145 | * uninitialised coro_context, it expects a pointer to the entry function |
137 | * 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. |
138 | * |
147 | * |
139 | * Allocating/deallocating the stack is your own responsibility, so there is |
148 | * Allocating/deallocating the stack is your own responsibility. |
140 | * 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. |
141 | */ |
156 | */ |
142 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
157 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
143 | coro_func coro, /* the coroutine code to be executed */ |
158 | coro_func coro, /* the coroutine code to be executed */ |
144 | void *arg, /* a single pointer passed to the coro */ |
159 | void *arg, /* a single pointer passed to the coro */ |
145 | void *sptr, /* start of stack area */ |
160 | void *sptr, /* start of stack area */ |
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147 | |
162 | |
148 | /* |
163 | /* |
149 | * The following prototype defines the coroutine switching function. It is |
164 | * The following prototype defines the coroutine switching function. It is |
150 | * usually implemented as a macro, so watch out. |
165 | * usually implemented as a macro, so watch out. |
151 | * |
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 |
152 | 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. |
153 | */ |
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 |
154 | |
183 | |
155 | /* |
184 | /* |
156 | * That was it. No other user-visible functions are implemented here. |
185 | * That was it. No other user-visible functions are implemented here. |
157 | */ |
186 | */ |
158 | |
187 | |
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184 | struct coro_context { |
213 | struct coro_context { |
185 | ucontext_t uc; |
214 | ucontext_t uc; |
186 | }; |
215 | }; |
187 | |
216 | |
188 | # 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) |
189 | |
219 | |
190 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
220 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
191 | |
221 | |
192 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
222 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
193 | # define _GNU_SOURCE /* for linux libc */ |
223 | # define _GNU_SOURCE /* for linux libc */ |
194 | # endif |
224 | # endif |
195 | |
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 | |
196 | # include <setjmp.h> |
230 | # include <setjmp.h> |
197 | |
231 | |
198 | struct coro_context { |
232 | struct coro_context { |
199 | jmp_buf env; |
233 | jmp_buf env; |
200 | }; |
234 | }; |
201 | |
235 | |
202 | # if CORO_LINUX || (_XOPEN_SOURCE >= 600) |
236 | # if _XOPEN_UNIX > 0 |
203 | # 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) |
204 | # else |
238 | # else |
205 | # define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0) |
239 | # define coro_transfer(p,n) do { if (! setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0) |
206 | # endif |
240 | # endif |
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241 | |
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242 | # define coro_destroy(ctx) (void *)(ctx) |
207 | |
243 | |
208 | #elif CORO_ASM |
244 | #elif CORO_ASM |
209 | |
245 | |
210 | struct coro_context { |
246 | struct coro_context { |
211 | volatile void **sp; |
247 | volatile void **sp; /* must be at offset 0 */ |
212 | }; |
248 | }; |
213 | |
249 | |
214 | void __attribute__ ((__noinline__, __regparm__(2))) |
250 | void __attribute__ ((__noinline__, __regparm__(2))) |
215 | coro_transfer (coro_context *prev, coro_context *next); |
251 | coro_transfer (coro_context *prev, coro_context *next); |
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252 | |
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253 | # define coro_destroy(ctx) (void *)(ctx) |
216 | |
254 | |
217 | #elif CORO_PTHREAD |
255 | #elif CORO_PTHREAD |
218 | |
256 | |
219 | #include <pthread.h> |
257 | # include <pthread.h> |
220 | |
258 | |
221 | extern pthread_mutex_t coro_mutex; |
259 | extern pthread_mutex_t coro_mutex; |
222 | |
260 | |
223 | struct coro_context { |
261 | struct coro_context { |
224 | pthread_cond_t c; |
262 | pthread_cond_t cv; |
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263 | pthread_t id; |
225 | }; |
264 | }; |
226 | |
265 | |
227 | void coro_transfer (coro_context *prev, coro_context *next); |
266 | void coro_transfer (coro_context *prev, coro_context *next); |
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267 | void coro_destroy (coro_context *ctx); |
228 | |
268 | |
229 | #endif |
269 | #endif |
230 | |
270 | |
231 | #endif |
271 | #endif |
232 | |
272 | |