| 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, |
| … | |
… | |
| 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. |
| 62 | * introduce coro_destroy, which is a nop except for pthreads. |
62 | * introduce coro_destroy, which is a nop except for pthreads. |
| 63 | * speed up CORO_PTHREAD. Do no longer leak threads either. |
63 | * speed up CORO_PTHREAD. Do no longer leak threads either. |
| 64 | * coro_create now allows one to create source coro_contexts. |
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). |
| 65 | */ |
72 | */ |
| 66 | |
73 | |
| 67 | #ifndef CORO_H |
74 | #ifndef CORO_H |
| 68 | #define CORO_H |
75 | #define CORO_H |
| 69 | |
76 | |
| … | |
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| 111 | * SGI's version of Microsoft's NT ;) |
118 | * SGI's version of Microsoft's NT ;) |
| 112 | * |
119 | * |
| 113 | * -DCORO_ASM |
120 | * -DCORO_ASM |
| 114 | * |
121 | * |
| 115 | * Handcoded assembly, known to work only on a few architectures/ABI: |
122 | * Handcoded assembly, known to work only on a few architectures/ABI: |
| 116 | * ELF Linux x86 && amd64 when gcc is used and optimisation is turned on. |
123 | * GCC + x86/IA32 and amd64/x86_64 + GNU/Linux and a few BSDs. |
| 117 | * |
124 | * |
| 118 | * -DCORO_PTHREAD |
125 | * -DCORO_PTHREAD |
| 119 | * |
126 | * |
| 120 | * Use the pthread API. You have to provide <pthread.h> and -lpthread. |
127 | * Use the pthread API. You have to provide <pthread.h> and -lpthread. |
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128 | * This is likely the slowest backend, and it also does not support fork(), |
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129 | * so avoid it at all costs. |
| 121 | * |
130 | * |
| 122 | * If you define neither of these symbols, coro.h will try to autodetect |
131 | * If you define neither of these symbols, coro.h will try to autodetect |
| 123 | * the model. This currently works for CORO_LOSER only. For the other |
132 | * the model. This currently works for CORO_LOSER only. For the other |
| 124 | * alternatives you should check (e.g. using autoconf) and define the |
133 | * alternatives you should check (e.g. using autoconf) and define the |
| 125 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
134 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
| … | |
… | |
| 143 | * and the single pointer value that is given to it as argument. |
152 | * and the single pointer value that is given to it as argument. |
| 144 | * |
153 | * |
| 145 | * Allocating/deallocating the stack is your own responsibility. |
154 | * Allocating/deallocating the stack is your own responsibility. |
| 146 | * |
155 | * |
| 147 | * As a special case, if coro, arg, sptr and ssize are all zero, |
156 | * As a special case, if coro, arg, sptr and ssize are all zero, |
| 148 | * then an "empty" coro_contetx will be created that is suitable |
157 | * then an "empty" coro_context will be created that is suitable |
| 149 | * as an initial source for coro_transfer. |
158 | * as an initial source for coro_transfer. |
| 150 | * |
159 | * |
| 151 | * This function is not reentrant, but putting a mutex around it |
160 | * This function is not reentrant, but putting a mutex around it |
| 152 | * will work. |
161 | * will work. |
| 153 | */ |
162 | */ |
| … | |
… | |
| 168 | #endif |
177 | #endif |
| 169 | |
178 | |
| 170 | /* |
179 | /* |
| 171 | * The following prototype defines the coroutine destroy function. It is |
180 | * The following prototype defines the coroutine destroy function. It is |
| 172 | * usually implemented as a macro, so watch out. It also serves |
181 | * usually implemented as a macro, so watch out. It also serves |
| 173 | * no purpose unless you want to use the CORO_PTHREAD backend. |
182 | * no purpose unless you want to use the CORO_PTHREAD backend, |
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183 | * where it is used to clean up the thread. You are responsible |
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184 | * for freeing the stack and the context itself. |
| 174 | * |
185 | * |
| 175 | * This function is thread-safe and reentrant. |
186 | * This function is thread-safe and reentrant. |
| 176 | */ |
187 | */ |
| 177 | #if 0 |
188 | #if 0 |
| 178 | void coro_destroy (coro_context *ctx); |
189 | void coro_destroy (coro_context *ctx); |
| … | |
… | |
| 218 | |
229 | |
| 219 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
230 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
| 220 | # define _GNU_SOURCE /* for linux libc */ |
231 | # define _GNU_SOURCE /* for linux libc */ |
| 221 | # endif |
232 | # endif |
| 222 | |
233 | |
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234 | # if !CORO_LOSER |
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235 | # include <unistd.h> |
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236 | # endif |
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237 | |
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238 | /* solaris is hopelessly borked, it expands _XOPEN_UNIX to nothing */ |
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239 | # if __sun |
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240 | # undef _XOPEN_UNIX |
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241 | # define _XOPEN_UNIX 1 |
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242 | # endif |
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243 | |
| 223 | # include <setjmp.h> |
244 | # include <setjmp.h> |
| 224 | |
245 | |
| 225 | struct coro_context { |
246 | # if _XOPEN_UNIX > 0 || defined (_setjmp) |
| 226 | jmp_buf env; |
247 | # define coro_jmp_buf jmp_buf |
| 227 | }; |
248 | # define coro_setjmp(env) _setjmp (env) |
| 228 | |
249 | # define coro_longjmp(env) _longjmp ((env), 1) |
| 229 | # if CORO_LINUX || (_XOPEN_SOURCE >= 600) |
250 | # elif CORO_LOSER |
| 230 | # define coro_transfer(p,n) do { if (!_setjmp ((p)->env)) _longjmp ((n)->env, 1); } while (0) |
251 | # define coro_jmp_buf jmp_buf |
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252 | # define coro_setjmp(env) setjmp (env) |
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253 | # define coro_longjmp(env) longjmp ((env), 1) |
| 231 | # else |
254 | # else |
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255 | # define coro_jmp_buf sigjmp_buf |
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256 | # define coro_setjmp(env) sigsetjmp (env, 0) |
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257 | # define coro_longjmp(env) siglongjmp ((env), 1) |
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258 | # endif |
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259 | |
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260 | struct coro_context { |
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261 | coro_jmp_buf env; |
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262 | }; |
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263 | |
| 232 | # define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0) |
264 | # define coro_transfer(p,n) do { if (!coro_setjmp ((p)->env)) coro_longjmp ((n)->env); } while (0) |
| 233 | # endif |
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| 234 | |
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| 235 | # define coro_destroy(ctx) (void *)(ctx) |
265 | # define coro_destroy(ctx) (void *)(ctx) |
| 236 | |
266 | |
| 237 | #elif CORO_ASM |
267 | #elif CORO_ASM |
| 238 | |
268 | |
| 239 | struct coro_context { |
269 | struct coro_context { |
| 240 | volatile void **sp; /* must be at offset 0 */ |
270 | void **sp; /* must be at offset 0 */ |
| 241 | }; |
271 | }; |
| 242 | |
272 | |
| 243 | void __attribute__ ((__noinline__, __regparm__(2))) |
273 | void __attribute__ ((__noinline__, __regparm__(2))) |
| 244 | coro_transfer (coro_context *prev, coro_context *next); |
274 | coro_transfer (coro_context *prev, coro_context *next); |
| 245 | |
275 | |
