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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. |
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69 | * 2008-11-16 work around a freebsd pthread bug. |
61 | */ |
70 | */ |
62 | |
71 | |
63 | #ifndef CORO_H |
72 | #ifndef CORO_H |
64 | #define CORO_H |
73 | #define CORO_H |
65 | |
74 | |
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107 | * SGI's version of Microsoft's NT ;) |
116 | * SGI's version of Microsoft's NT ;) |
108 | * |
117 | * |
109 | * -DCORO_ASM |
118 | * -DCORO_ASM |
110 | * |
119 | * |
111 | * Handcoded assembly, known to work only on a few architectures/ABI: |
120 | * Handcoded assembly, known to work only on a few architectures/ABI: |
112 | * ELF Linux x86 && amd64 when gcc is used and optimisation is turned on. |
121 | * GCC + x86/IA32 and amd64/x86_64 + GNU/Linux and a few BSDs. |
113 | * |
122 | * |
114 | * -DCORO_PTHREAD |
123 | * -DCORO_PTHREAD |
115 | * |
124 | * |
116 | * Use the pthread API. You have to provide <pthread.h> and -lpthread. |
125 | * Use the pthread API. You have to provide <pthread.h> and -lpthread. |
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126 | * This is likely the slowest backend, and it also does not support fork(), |
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127 | * so avoid it at all costs. |
117 | * |
128 | * |
118 | * If you define neither of these symbols, coro.h will try to autodetect |
129 | * If you define neither of these symbols, coro.h will try to autodetect |
119 | * the model. This currently works for CORO_LOSER only. For the other |
130 | * the model. This currently works for CORO_LOSER only. For the other |
120 | * alternatives you should check (e.g. using autoconf) and define the |
131 | * alternatives you should check (e.g. using autoconf) and define the |
121 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
132 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
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136 | /* |
147 | /* |
137 | * This function creates a new coroutine. Apart from a pointer to an |
148 | * This function creates a new coroutine. Apart from a pointer to an |
138 | * uninitialised coro_context, it expects a pointer to the entry function |
149 | * uninitialised coro_context, it expects a pointer to the entry function |
139 | * and the single pointer value that is given to it as argument. |
150 | * and the single pointer value that is given to it as argument. |
140 | * |
151 | * |
141 | * Allocating/deallocating the stack is your own responsibility, so there is |
152 | * Allocating/deallocating the stack is your own responsibility. |
142 | * no coro_destroy function. |
153 | * |
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154 | * As a special case, if coro, arg, sptr and ssize are all zero, |
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155 | * then an "empty" coro_context will be created that is suitable |
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156 | * as an initial source for coro_transfer. |
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157 | * |
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158 | * This function is not reentrant, but putting a mutex around it |
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159 | * will work. |
143 | */ |
160 | */ |
144 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
161 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
145 | coro_func coro, /* the coroutine code to be executed */ |
162 | coro_func coro, /* the coroutine code to be executed */ |
146 | void *arg, /* a single pointer passed to the coro */ |
163 | void *arg, /* a single pointer passed to the coro */ |
147 | void *sptr, /* start of stack area */ |
164 | void *sptr, /* start of stack area */ |
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149 | |
166 | |
150 | /* |
167 | /* |
151 | * The following prototype defines the coroutine switching function. It is |
168 | * The following prototype defines the coroutine switching function. It is |
152 | * usually implemented as a macro, so watch out. |
169 | * usually implemented as a macro, so watch out. |
153 | * |
170 | * |
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171 | * This function is thread-safe and reentrant. |
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172 | */ |
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173 | #if 0 |
154 | void coro_transfer(coro_context *prev, coro_context *next); |
174 | void coro_transfer (coro_context *prev, coro_context *next); |
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175 | #endif |
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176 | |
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177 | /* |
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178 | * The following prototype defines the coroutine destroy function. It is |
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179 | * usually implemented as a macro, so watch out. It also serves |
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180 | * no purpose unless you want to use the CORO_PTHREAD backend, |
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181 | * where it is used to clean up the thread. You are responsible |
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182 | * for freeing the stack and the context itself. |
155 | */ |
183 | * |
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184 | * This function is thread-safe and reentrant. |
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185 | */ |
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186 | #if 0 |
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187 | void coro_destroy (coro_context *ctx); |
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188 | #endif |
156 | |
189 | |
157 | /* |
190 | /* |
158 | * That was it. No other user-visible functions are implemented here. |
191 | * That was it. No other user-visible functions are implemented here. |
159 | */ |
192 | */ |
160 | |
193 | |
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186 | struct coro_context { |
219 | struct coro_context { |
187 | ucontext_t uc; |
220 | ucontext_t uc; |
188 | }; |
221 | }; |
189 | |
222 | |
190 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
223 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
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224 | # define coro_destroy(ctx) (void *)(ctx) |
191 | |
225 | |
192 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
226 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
193 | |
227 | |
194 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
228 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
195 | # define _GNU_SOURCE /* for linux libc */ |
229 | # define _GNU_SOURCE /* for linux libc */ |
196 | # endif |
230 | # endif |
197 | |
231 | |
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232 | # if !CORO_LOSER |
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233 | # include <unistd.h> |
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234 | # endif |
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235 | |
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236 | /* solaris is hopelessly borked, it expands _XOPEN_UNIX to nothing */ |
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237 | # if __sun |
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238 | # undef _XOPEN_UNIX |
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239 | # define _XOPEN_UNIX 1 |
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240 | # endif |
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241 | |
198 | # include <setjmp.h> |
242 | # include <setjmp.h> |
199 | |
243 | |
200 | struct coro_context { |
244 | struct coro_context { |
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245 | #if _XOPEN_UNIX > 0 || CORO_LOSER |
201 | jmp_buf env; |
246 | jmp_buf env; |
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247 | #else |
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248 | sigjmp_buf env; |
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249 | #endif |
202 | }; |
250 | }; |
203 | |
251 | |
204 | # if CORO_LINUX || (_XOPEN_SOURCE >= 600) |
252 | # if _XOPEN_UNIX > 0 |
205 | # define coro_transfer(p,n) do { if (!_setjmp ((p)->env)) _longjmp ((n)->env, 1); } while (0) |
253 | # define coro_transfer(p,n) do { if (! _setjmp ((p)->env )) _longjmp ((n)->env, 1); } while (0) |
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254 | # elif CORO_LOSER |
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255 | # define coro_transfer(p,n) do { if (! setjmp ((p)->env )) longjmp ((n)->env, 1); } while (0) |
206 | # else |
256 | # else |
207 | # define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0) |
257 | # define coro_transfer(p,n) do { if (!sigsetjmp ((p)->env, 0)) siglongjmp ((n)->env, 1); } while (0) |
208 | # endif |
258 | # endif |
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259 | |
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260 | # define coro_destroy(ctx) (void *)(ctx) |
209 | |
261 | |
210 | #elif CORO_ASM |
262 | #elif CORO_ASM |
211 | |
263 | |
212 | struct coro_context { |
264 | struct coro_context { |
213 | volatile void **sp; /* must be at offset 0 */ |
265 | void **sp; /* must be at offset 0 */ |
214 | }; |
266 | }; |
215 | |
267 | |
216 | void __attribute__ ((__noinline__, __regparm__(2))) |
268 | void __attribute__ ((__noinline__, __regparm__(2))) |
217 | coro_transfer (coro_context *prev, coro_context *next); |
269 | coro_transfer (coro_context *prev, coro_context *next); |
218 | |
270 | |
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271 | # define coro_destroy(ctx) (void *)(ctx) |
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272 | |
219 | #elif CORO_PTHREAD |
273 | #elif CORO_PTHREAD |
220 | |
274 | |
221 | #include <pthread.h> |
275 | # include <pthread.h> |
222 | |
276 | |
223 | extern pthread_mutex_t coro_mutex; |
277 | extern pthread_mutex_t coro_mutex; |
224 | |
278 | |
225 | struct coro_context { |
279 | struct coro_context { |
226 | pthread_cond_t c; |
280 | pthread_cond_t cv; |
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281 | pthread_t id; |
227 | }; |
282 | }; |
228 | |
283 | |
229 | void coro_transfer (coro_context *prev, coro_context *next); |
284 | void coro_transfer (coro_context *prev, coro_context *next); |
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285 | void coro_destroy (coro_context *ctx); |
230 | |
286 | |
231 | #endif |
287 | #endif |
232 | |
288 | |
233 | #endif |
289 | #endif |
234 | |
290 | |