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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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. |
65 | * do not rely on makecontext passing a void * correctly. |
65 | * do not rely on makecontext passing a void * correctly. |
66 | * try harder to get _setjmp/_longjmp. |
66 | * try harder to get _setjmp/_longjmp. |
67 | * major code cleanup/restructuring. |
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). |
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73 | * 2011-05-30 set initial callee-saved-registers to zero with CORO_ASM. |
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74 | * use .cfi_undefined rip on linux-amd64 for better backtraces. |
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75 | * 2011-06-08 maybe properly implement weird windows amd64 calling conventions. |
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76 | * 2011-07-03 rely on __GCC_HAVE_DWARF2_CFI_ASM for cfi detection. |
68 | */ |
77 | */ |
69 | |
78 | |
70 | #ifndef CORO_H |
79 | #ifndef CORO_H |
71 | #define CORO_H |
80 | #define CORO_H |
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81 | |
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82 | #if __cplusplus |
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83 | extern "C" { |
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84 | #endif |
72 | |
85 | |
73 | #define CORO_VERSION 2 |
86 | #define CORO_VERSION 2 |
74 | |
87 | |
75 | /* |
88 | /* |
76 | * Changes since API version 1: |
89 | * Changes since API version 1: |
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114 | * SGI's version of Microsoft's NT ;) |
127 | * SGI's version of Microsoft's NT ;) |
115 | * |
128 | * |
116 | * -DCORO_ASM |
129 | * -DCORO_ASM |
117 | * |
130 | * |
118 | * Handcoded assembly, known to work only on a few architectures/ABI: |
131 | * Handcoded assembly, known to work only on a few architectures/ABI: |
119 | * ELF Linux x86 && amd64 when gcc is used and optimisation is turned on. |
132 | * GCC + x86/IA32 and amd64/x86_64 + GNU/Linux and a few BSDs. |
120 | * |
133 | * |
121 | * -DCORO_PTHREAD |
134 | * -DCORO_PTHREAD |
122 | * |
135 | * |
123 | * Use the pthread API. You have to provide <pthread.h> and -lpthread. |
136 | * Use the pthread API. You have to provide <pthread.h> and -lpthread. |
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137 | * This is likely the slowest backend, and it also does not support fork(), |
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138 | * so avoid it at all costs. |
124 | * |
139 | * |
125 | * If you define neither of these symbols, coro.h will try to autodetect |
140 | * If you define neither of these symbols, coro.h will try to autodetect |
126 | * the model. This currently works for CORO_LOSER only. For the other |
141 | * the model. This currently works for CORO_LOSER only. For the other |
127 | * alternatives you should check (e.g. using autoconf) and define the |
142 | * alternatives you should check (e.g. using autoconf) and define the |
128 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
143 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
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146 | * and the single pointer value that is given to it as argument. |
161 | * and the single pointer value that is given to it as argument. |
147 | * |
162 | * |
148 | * Allocating/deallocating the stack is your own responsibility. |
163 | * Allocating/deallocating the stack is your own responsibility. |
149 | * |
164 | * |
150 | * As a special case, if coro, arg, sptr and ssize are all zero, |
165 | * As a special case, if coro, arg, sptr and ssize are all zero, |
151 | * then an "empty" coro_contetx will be created that is suitable |
166 | * then an "empty" coro_context will be created that is suitable |
152 | * as an initial source for coro_transfer. |
167 | * as an initial source for coro_transfer. |
153 | * |
168 | * |
154 | * This function is not reentrant, but putting a mutex around it |
169 | * This function is not reentrant, but putting a mutex around it |
155 | * will work. |
170 | * will work. |
156 | */ |
171 | */ |
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171 | #endif |
186 | #endif |
172 | |
187 | |
173 | /* |
188 | /* |
174 | * The following prototype defines the coroutine destroy function. It is |
189 | * The following prototype defines the coroutine destroy function. It is |
175 | * usually implemented as a macro, so watch out. It also serves |
190 | * usually implemented as a macro, so watch out. It also serves |
176 | * no purpose unless you want to use the CORO_PTHREAD backend. |
191 | * no purpose unless you want to use the CORO_PTHREAD backend, |
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192 | * where it is used to clean up the thread. You are responsible |
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193 | * for freeing the stack and the context itself. |
177 | * |
194 | * |
178 | * This function is thread-safe and reentrant. |
195 | * This function is thread-safe and reentrant. |
179 | */ |
196 | */ |
180 | #if 0 |
197 | #if 0 |
181 | void coro_destroy (coro_context *ctx); |
198 | void coro_destroy (coro_context *ctx); |
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189 | |
206 | |
190 | #if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \ |
207 | #if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \ |
191 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ |
208 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ |
192 | && !defined(CORO_IRIX) && !defined(CORO_ASM) \ |
209 | && !defined(CORO_IRIX) && !defined(CORO_ASM) \ |
193 | && !defined(CORO_PTHREAD) |
210 | && !defined(CORO_PTHREAD) |
194 | # if defined(WINDOWS) |
211 | # if defined(WINDOWS) || defined(_WIN32) |
195 | # define CORO_LOSER 1 /* you don't win with windoze */ |
212 | # define CORO_LOSER 1 /* you don't win with windoze */ |
196 | # elif defined(__linux) && (defined(__x86) || defined (__amd64)) |
213 | # elif defined(__linux) && (defined(__x86) || defined (__amd64)) |
197 | # define CORO_ASM 1 |
214 | # define CORO_ASM 1 |
198 | # elif defined(HAVE_UCONTEXT_H) |
215 | # elif defined(HAVE_UCONTEXT_H) |
199 | # define CORO_UCONTEXT 1 |
216 | # define CORO_UCONTEXT 1 |
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225 | |
242 | |
226 | # if !CORO_LOSER |
243 | # if !CORO_LOSER |
227 | # include <unistd.h> |
244 | # include <unistd.h> |
228 | # endif |
245 | # endif |
229 | |
246 | |
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247 | /* solaris is hopelessly borked, it expands _XOPEN_UNIX to nothing */ |
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248 | # if __sun |
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249 | # undef _XOPEN_UNIX |
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250 | # define _XOPEN_UNIX 1 |
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251 | # endif |
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252 | |
230 | # include <setjmp.h> |
253 | # include <setjmp.h> |
231 | |
254 | |
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255 | # if _XOPEN_UNIX > 0 || defined (_setjmp) |
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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 | # elif CORO_LOSER |
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260 | # define coro_jmp_buf jmp_buf |
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261 | # define coro_setjmp(env) setjmp (env) |
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262 | # define coro_longjmp(env) longjmp ((env), 1) |
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263 | # else |
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264 | # define coro_jmp_buf sigjmp_buf |
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265 | # define coro_setjmp(env) sigsetjmp (env, 0) |
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266 | # define coro_longjmp(env) siglongjmp ((env), 1) |
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267 | # endif |
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268 | |
232 | struct coro_context { |
269 | struct coro_context { |
233 | jmp_buf env; |
270 | coro_jmp_buf env; |
234 | }; |
271 | }; |
235 | |
272 | |
236 | # if _XOPEN_UNIX > 0 |
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237 | # define coro_transfer(p,n) do { if (! _setjmp ((p)->env )) _longjmp ((n)->env, 1); } while (0) |
273 | # define coro_transfer(p,n) do { if (!coro_setjmp ((p)->env)) coro_longjmp ((n)->env); } while (0) |
238 | # elif CORO_LOSER |
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239 | # define coro_transfer(p,n) do { if (! setjmp ((p)->env )) longjmp ((n)->env, 1); } while (0) |
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240 | # else |
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241 | # define coro_transfer(p,n) do { if (!sigsetjmp ((p)->env, 0)) siglongjmp ((n)->env, 1); } while (0) |
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242 | # endif |
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243 | |
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244 | # define coro_destroy(ctx) (void *)(ctx) |
274 | # define coro_destroy(ctx) (void *)(ctx) |
245 | |
275 | |
246 | #elif CORO_ASM |
276 | #elif CORO_ASM |
247 | |
277 | |
248 | struct coro_context { |
278 | struct coro_context { |
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268 | void coro_transfer (coro_context *prev, coro_context *next); |
298 | void coro_transfer (coro_context *prev, coro_context *next); |
269 | void coro_destroy (coro_context *ctx); |
299 | void coro_destroy (coro_context *ctx); |
270 | |
300 | |
271 | #endif |
301 | #endif |
272 | |
302 | |
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303 | #if __cplusplus |
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304 | } |
273 | #endif |
305 | #endif |
274 | |
306 | |
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307 | #endif |
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308 | |