1 | /* |
1 | /* |
2 | * Copyright (c) 2001-2008 Marc Alexander Lehmann <schmorp@schmorp.de> |
2 | * Copyright (c) 2001-2009 Marc Alexander Lehmann <schmorp@schmorp.de> |
3 | * |
3 | * |
4 | * Redistribution and use in source and binary forms, with or without modifica- |
4 | * Redistribution and use in source and binary forms, with or without modifica- |
5 | * tion, are permitted provided that the following conditions are met: |
5 | * tion, are permitted provided that the following conditions are met: |
6 | * |
6 | * |
7 | * 1. Redistributions of source code must retain the above copyright notice, |
7 | * 1. Redistributions of source code must retain the above copyright notice, |
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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. |
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70 | * 2008-11-19 define coro_*jmp symbols for easier porting. |
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71 | * 2009-06-23 tentative win32-backend support for mingw32 (Yasuhiro Matsumoto). |
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72 | * 2010-12-03 tentative support for uclibc (which lacks all sorts of things). |
61 | */ |
73 | */ |
62 | |
74 | |
63 | #ifndef CORO_H |
75 | #ifndef CORO_H |
64 | #define CORO_H |
76 | #define CORO_H |
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77 | |
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78 | #if __cplusplus |
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79 | extern "C" { |
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80 | #endif |
65 | |
81 | |
66 | #define CORO_VERSION 2 |
82 | #define CORO_VERSION 2 |
67 | |
83 | |
68 | /* |
84 | /* |
69 | * Changes since API version 1: |
85 | * Changes since API version 1: |
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107 | * SGI's version of Microsoft's NT ;) |
123 | * SGI's version of Microsoft's NT ;) |
108 | * |
124 | * |
109 | * -DCORO_ASM |
125 | * -DCORO_ASM |
110 | * |
126 | * |
111 | * Handcoded assembly, known to work only on a few architectures/ABI: |
127 | * 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. |
128 | * GCC + x86/IA32 and amd64/x86_64 + GNU/Linux and a few BSDs. |
113 | * |
129 | * |
114 | * -DCORO_PTHREAD |
130 | * -DCORO_PTHREAD |
115 | * |
131 | * |
116 | * Use the pthread API. You have to provide <pthread.h> and -lpthread. |
132 | * Use the pthread API. You have to provide <pthread.h> and -lpthread. |
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133 | * This is likely the slowest backend, and it also does not support fork(), |
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134 | * so avoid it at all costs. |
117 | * |
135 | * |
118 | * If you define neither of these symbols, coro.h will try to autodetect |
136 | * 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 |
137 | * the model. This currently works for CORO_LOSER only. For the other |
120 | * alternatives you should check (e.g. using autoconf) and define the |
138 | * alternatives you should check (e.g. using autoconf) and define the |
121 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
139 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
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136 | /* |
154 | /* |
137 | * This function creates a new coroutine. Apart from a pointer to an |
155 | * This function creates a new coroutine. Apart from a pointer to an |
138 | * uninitialised coro_context, it expects a pointer to the entry function |
156 | * uninitialised coro_context, it expects a pointer to the entry function |
139 | * and the single pointer value that is given to it as argument. |
157 | * and the single pointer value that is given to it as argument. |
140 | * |
158 | * |
141 | * Allocating/deallocating the stack is your own responsibility, so there is |
159 | * Allocating/deallocating the stack is your own responsibility. |
142 | * no coro_destroy function. |
160 | * |
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161 | * As a special case, if coro, arg, sptr and ssize are all zero, |
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162 | * then an "empty" coro_context will be created that is suitable |
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163 | * as an initial source for coro_transfer. |
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164 | * |
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165 | * This function is not reentrant, but putting a mutex around it |
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166 | * will work. |
143 | */ |
167 | */ |
144 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
168 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
145 | coro_func coro, /* the coroutine code to be executed */ |
169 | coro_func coro, /* the coroutine code to be executed */ |
146 | void *arg, /* a single pointer passed to the coro */ |
170 | void *arg, /* a single pointer passed to the coro */ |
147 | void *sptr, /* start of stack area */ |
171 | void *sptr, /* start of stack area */ |
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149 | |
173 | |
150 | /* |
174 | /* |
151 | * The following prototype defines the coroutine switching function. It is |
175 | * The following prototype defines the coroutine switching function. It is |
152 | * usually implemented as a macro, so watch out. |
176 | * usually implemented as a macro, so watch out. |
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 |
154 | void coro_transfer(coro_context *prev, coro_context *next); |
181 | void coro_transfer (coro_context *prev, coro_context *next); |
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182 | #endif |
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183 | |
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184 | /* |
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185 | * The following prototype defines the coroutine destroy function. It is |
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186 | * usually implemented as a macro, so watch out. It also serves |
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187 | * no purpose unless you want to use the CORO_PTHREAD backend, |
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188 | * where it is used to clean up the thread. You are responsible |
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189 | * for freeing the stack and the context itself. |
155 | */ |
190 | * |
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191 | * This function is thread-safe and reentrant. |
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192 | */ |
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193 | #if 0 |
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194 | void coro_destroy (coro_context *ctx); |
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195 | #endif |
156 | |
196 | |
157 | /* |
197 | /* |
158 | * That was it. No other user-visible functions are implemented here. |
198 | * That was it. No other user-visible functions are implemented here. |
159 | */ |
199 | */ |
160 | |
200 | |
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186 | struct coro_context { |
226 | struct coro_context { |
187 | ucontext_t uc; |
227 | ucontext_t uc; |
188 | }; |
228 | }; |
189 | |
229 | |
190 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
230 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
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231 | # define coro_destroy(ctx) (void *)(ctx) |
191 | |
232 | |
192 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
233 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
193 | |
234 | |
194 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
235 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
195 | # define _GNU_SOURCE /* for linux libc */ |
236 | # define _GNU_SOURCE /* for linux libc */ |
196 | # endif |
237 | # endif |
197 | |
238 | |
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239 | # if !CORO_LOSER |
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240 | # include <unistd.h> |
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241 | # endif |
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242 | |
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243 | /* solaris is hopelessly borked, it expands _XOPEN_UNIX to nothing */ |
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244 | # if __sun |
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245 | # undef _XOPEN_UNIX |
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246 | # define _XOPEN_UNIX 1 |
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247 | # endif |
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248 | |
198 | # include <setjmp.h> |
249 | # include <setjmp.h> |
199 | |
250 | |
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251 | # if _XOPEN_UNIX > 0 || defined (_setjmp) |
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252 | # define coro_jmp_buf jmp_buf |
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253 | # define coro_setjmp(env) _setjmp (env) |
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254 | # define coro_longjmp(env) _longjmp ((env), 1) |
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255 | # elif CORO_LOSER |
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256 | # define coro_jmp_buf jmp_buf |
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257 | # define coro_setjmp(env) setjmp (env) |
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258 | # define coro_longjmp(env) longjmp ((env), 1) |
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259 | # else |
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260 | # define coro_jmp_buf sigjmp_buf |
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261 | # define coro_setjmp(env) sigsetjmp (env, 0) |
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262 | # define coro_longjmp(env) siglongjmp ((env), 1) |
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263 | # endif |
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264 | |
200 | struct coro_context { |
265 | struct coro_context { |
201 | jmp_buf env; |
266 | coro_jmp_buf env; |
202 | }; |
267 | }; |
203 | |
268 | |
204 | # if CORO_LINUX || (_XOPEN_SOURCE >= 600) |
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205 | # define coro_transfer(p,n) do { if (!_setjmp ((p)->env)) _longjmp ((n)->env, 1); } while (0) |
269 | # define coro_transfer(p,n) do { if (!coro_setjmp ((p)->env)) coro_longjmp ((n)->env); } while (0) |
206 | # else |
270 | # define coro_destroy(ctx) (void *)(ctx) |
207 | # define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0) |
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208 | # endif |
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209 | |
271 | |
210 | #elif CORO_ASM |
272 | #elif CORO_ASM |
211 | |
273 | |
212 | struct coro_context { |
274 | struct coro_context { |
213 | volatile void **sp; /* must be at offset 0 */ |
275 | void **sp; /* must be at offset 0 */ |
214 | }; |
276 | }; |
215 | |
277 | |
216 | void __attribute__ ((__noinline__, __regparm__(2))) |
278 | void __attribute__ ((__noinline__, __regparm__(2))) |
217 | coro_transfer (coro_context *prev, coro_context *next); |
279 | coro_transfer (coro_context *prev, coro_context *next); |
218 | |
280 | |
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281 | # define coro_destroy(ctx) (void *)(ctx) |
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282 | |
219 | #elif CORO_PTHREAD |
283 | #elif CORO_PTHREAD |
220 | |
284 | |
221 | #include <pthread.h> |
285 | # include <pthread.h> |
222 | |
286 | |
223 | extern pthread_mutex_t coro_mutex; |
287 | extern pthread_mutex_t coro_mutex; |
224 | |
288 | |
225 | struct coro_context { |
289 | struct coro_context { |
226 | pthread_cond_t c; |
290 | pthread_cond_t cv; |
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291 | pthread_t id; |
227 | }; |
292 | }; |
228 | |
293 | |
229 | void coro_transfer (coro_context *prev, coro_context *next); |
294 | void coro_transfer (coro_context *prev, coro_context *next); |
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295 | void coro_destroy (coro_context *ctx); |
230 | |
296 | |
231 | #endif |
297 | #endif |
232 | |
298 | |
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299 | #if __cplusplus |
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300 | } |
233 | #endif |
301 | #endif |
234 | |
302 | |
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303 | #endif |
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304 | |