1 | /* |
1 | /* |
2 | * Copyright (c) 2001-2009 Marc Alexander Lehmann <schmorp@schmorp.de> |
2 | * Copyright (c) 2001-2012 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, |
8 | * this list of conditions and the following disclaimer. |
8 | * this list of conditions and the following disclaimer. |
9 | * |
9 | * |
10 | * 2. Redistributions in binary form must reproduce the above copyright |
10 | * 2. Redistributions in binary form must reproduce the above copyright |
11 | * notice, this list of conditions and the following disclaimer in the |
11 | * notice, this list of conditions and the following disclaimer in the |
12 | * documentation and/or other materials provided with the distribution. |
12 | * documentation and/or other materials provided with the distribution. |
13 | * |
13 | * |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
15 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
15 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
16 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
16 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
17 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
17 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
18 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
18 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
… | |
… | |
67 | * major code cleanup/restructuring. |
67 | * major code cleanup/restructuring. |
68 | * 2008-11-10 the .cfi hacks are no longer needed. |
68 | * 2008-11-10 the .cfi hacks are no longer needed. |
69 | * 2008-11-16 work around a freebsd pthread bug. |
69 | * 2008-11-16 work around a freebsd pthread bug. |
70 | * 2008-11-19 define coro_*jmp symbols for easier porting. |
70 | * 2008-11-19 define coro_*jmp symbols for easier porting. |
71 | * 2009-06-23 tentative win32-backend support for mingw32 (Yasuhiro Matsumoto). |
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. |
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77 | * 2011-08-08 cygwin trashes stacks, use pthreads with double stack on cygwin. |
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78 | * 2012-12-04 reduce misprediction penalty for x86/amd64 assembly switcher. |
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79 | * 2012-12-05 experimental fiber backend (allocates stack twice). |
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80 | * 2012-12-07 API version 3 - add coro_stack_alloc/coro_stack_free. |
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81 | * 2012-12-21 valgrind stack registering was broken. |
72 | */ |
82 | */ |
73 | |
83 | |
74 | #ifndef CORO_H |
84 | #ifndef CORO_H |
75 | #define CORO_H |
85 | #define CORO_H |
76 | |
86 | |
77 | #define CORO_VERSION 2 |
87 | #if __cplusplus |
78 | |
88 | extern "C" { |
79 | /* |
89 | #endif |
80 | * Changes since API version 1: |
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81 | * replaced bogus -DCORO_LOOSE with gramatically more correct -DCORO_LOSER |
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82 | */ |
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83 | |
90 | |
84 | /* |
91 | /* |
85 | * This library consists of only three files |
92 | * This library consists of only three files |
86 | * coro.h, coro.c and LICENSE (and optionally README) |
93 | * coro.h, coro.c and LICENSE (and optionally README) |
87 | * |
94 | * |
88 | * It implements what is known as coroutines, in a hopefully |
95 | * It implements what is known as coroutines, in a hopefully |
89 | * portable way. At the moment you have to define which kind |
96 | * portable way. |
90 | * of implementation flavour you want: |
97 | * |
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98 | * All compiletime symbols must be defined both when including coro.h |
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99 | * (using libcoro) as well as when compiling coro.c (the implementation). |
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100 | * |
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101 | * You can manually specify which flavour you want. If you don't define |
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102 | * any of these, libcoro tries to choose a safe and fast default: |
91 | * |
103 | * |
92 | * -DCORO_UCONTEXT |
104 | * -DCORO_UCONTEXT |
93 | * |
105 | * |
94 | * This flavour uses SUSv2's get/set/swap/makecontext functions that |
106 | * This flavour uses SUSv2's get/set/swap/makecontext functions that |
95 | * unfortunately only newer unices support. |
107 | * unfortunately only some unices support, and is quite slow. |
96 | * |
108 | * |
97 | * -DCORO_SJLJ |
109 | * -DCORO_SJLJ |
98 | * |
110 | * |
99 | * This flavour uses SUSv2's setjmp/longjmp and sigaltstack functions to |
111 | * This flavour uses SUSv2's setjmp/longjmp and sigaltstack functions to |
100 | * do it's job. Coroutine creation is much slower than UCONTEXT, but |
112 | * do it's job. Coroutine creation is much slower than UCONTEXT, but |
101 | * context switching is often a bit cheaper. It should work on almost |
113 | * context switching is a bit cheaper. It should work on almost all unices. |
102 | * all unices. |
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103 | * |
114 | * |
104 | * -DCORO_LINUX |
115 | * -DCORO_LINUX |
105 | * |
116 | * |
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117 | * CORO_SJLJ variant. |
106 | * Old GNU/Linux systems (<= glibc-2.1) only work with this implementation |
118 | * Old GNU/Linux systems (<= glibc-2.1) only work with this implementation |
107 | * (it is very fast and therefore recommended over other methods, but |
119 | * (it is very fast and therefore recommended over other methods, but |
108 | * doesn't work with anything newer). |
120 | * doesn't work with anything newer). |
109 | * |
121 | * |
110 | * -DCORO_LOSER |
122 | * -DCORO_LOSER |
111 | * |
123 | * |
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124 | * CORO_SJLJ variant. |
112 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
125 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
113 | * this automatically selects a suitable workaround for this platform. |
126 | * this selects a suitable workaround for this platform. It might not work |
114 | * (untested) |
127 | * with your compiler though - it has only been tested with MSVC 6. |
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128 | * |
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129 | * -DCORO_FIBER |
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130 | * |
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131 | * Slower, but probably more portable variant for the Microsoft operating |
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132 | * system, using fibers. Ignores the passed stack and allocates it internally. |
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133 | * Also, due to bugs in cygwin, this does not work with cygwin. |
115 | * |
134 | * |
116 | * -DCORO_IRIX |
135 | * -DCORO_IRIX |
117 | * |
136 | * |
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137 | * CORO_SJLJ variant. |
118 | * SGI's version of Microsoft's NT ;) |
138 | * For SGI's version of Microsoft's NT ;) |
119 | * |
139 | * |
120 | * -DCORO_ASM |
140 | * -DCORO_ASM |
121 | * |
141 | * |
122 | * Handcoded assembly, known to work only on a few architectures/ABI: |
142 | * Hand coded assembly, known to work only on a few architectures/ABI: |
123 | * GCC + x86/IA32 and amd64/x86_64 + GNU/Linux and a few BSDs. |
143 | * GCC + x86/IA32 and amd64/x86_64 + GNU/Linux and a few BSDs. Fastest choice, |
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144 | * if it works. |
124 | * |
145 | * |
125 | * -DCORO_PTHREAD |
146 | * -DCORO_PTHREAD |
126 | * |
147 | * |
127 | * Use the pthread API. You have to provide <pthread.h> and -lpthread. |
148 | * Use the pthread API. You have to provide <pthread.h> and -lpthread. |
128 | * This is likely the slowest backend, and it also does not support fork(), |
149 | * This is likely the slowest backend, and it also does not support fork(), |
129 | * so avoid it at all costs. |
150 | * so avoid it at all costs. |
130 | * |
151 | * |
131 | * If you define neither of these symbols, coro.h will try to autodetect |
152 | * If you define neither of these symbols, coro.h will try to autodetect |
132 | * the model. This currently works for CORO_LOSER only. For the other |
153 | * the best/safest model. To help with the autodetection, you should check |
133 | * alternatives you should check (e.g. using autoconf) and define the |
154 | * (e.g. using autoconf) and define the following symbols: HAVE_UCONTEXT_H |
134 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
155 | * / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
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156 | */ |
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157 | |
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158 | /* |
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159 | * Changes when the API changes incompatibly. |
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160 | * This is ONLY the API version - there is no ABI compatibility between releases. |
135 | */ |
161 | * |
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162 | * Changes in API version 2: |
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163 | * replaced bogus -DCORO_LOOSE with grammatically more correct -DCORO_LOSER |
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164 | * Changes in API version 3: |
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165 | * introduced stack management (CORO_STACKALLOC) |
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166 | */ |
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167 | #define CORO_VERSION 3 |
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168 | |
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169 | #include <stddef.h> |
136 | |
170 | |
137 | /* |
171 | /* |
138 | * This is the type for the initialization function of a new coroutine. |
172 | * This is the type for the initialization function of a new coroutine. |
139 | */ |
173 | */ |
140 | typedef void (*coro_func)(void *); |
174 | typedef void (*coro_func)(void *); |
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151 | * uninitialised coro_context, it expects a pointer to the entry function |
185 | * uninitialised coro_context, it expects a pointer to the entry function |
152 | * and the single pointer value that is given to it as argument. |
186 | * and the single pointer value that is given to it as argument. |
153 | * |
187 | * |
154 | * Allocating/deallocating the stack is your own responsibility. |
188 | * Allocating/deallocating the stack is your own responsibility. |
155 | * |
189 | * |
156 | * As a special case, if coro, arg, sptr and ssize are all zero, |
190 | * As a special case, if coro, arg, sptr and ssze are all zero, |
157 | * then an "empty" coro_context will be created that is suitable |
191 | * then an "empty" coro_context will be created that is suitable |
158 | * as an initial source for coro_transfer. |
192 | * as an initial source for coro_transfer. |
159 | * |
193 | * |
160 | * This function is not reentrant, but putting a mutex around it |
194 | * This function is not reentrant, but putting a mutex around it |
161 | * will work. |
195 | * will work. |
162 | */ |
196 | */ |
163 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
197 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
164 | coro_func coro, /* the coroutine code to be executed */ |
198 | coro_func coro, /* the coroutine code to be executed */ |
165 | void *arg, /* a single pointer passed to the coro */ |
199 | void *arg, /* a single pointer passed to the coro */ |
166 | void *sptr, /* start of stack area */ |
200 | void *sptr, /* start of stack area */ |
167 | long ssize); /* size of stack area */ |
201 | size_t ssze); /* size of stack area in bytes */ |
168 | |
202 | |
169 | /* |
203 | /* |
170 | * The following prototype defines the coroutine switching function. It is |
204 | * The following prototype defines the coroutine switching function. It is |
171 | * usually implemented as a macro, so watch out. |
205 | * sometimes implemented as a macro, so watch out. |
172 | * |
206 | * |
173 | * This function is thread-safe and reentrant. |
207 | * This function is thread-safe and reentrant. |
174 | */ |
208 | */ |
175 | #if 0 |
209 | #if 0 |
176 | void coro_transfer (coro_context *prev, coro_context *next); |
210 | void coro_transfer (coro_context *prev, coro_context *next); |
177 | #endif |
211 | #endif |
178 | |
212 | |
179 | /* |
213 | /* |
180 | * The following prototype defines the coroutine destroy function. It is |
214 | * The following prototype defines the coroutine destroy function. It |
181 | * usually implemented as a macro, so watch out. It also serves |
215 | * is sometimes implemented as a macro, so watch out. It also serves no |
182 | * no purpose unless you want to use the CORO_PTHREAD backend, |
216 | * purpose unless you want to use the CORO_PTHREAD backend, where it is |
183 | * where it is used to clean up the thread. You are responsible |
217 | * used to clean up the thread. You are responsible for freeing the stack |
184 | * for freeing the stack and the context itself. |
218 | * and the context itself. |
185 | * |
219 | * |
186 | * This function is thread-safe and reentrant. |
220 | * This function is thread-safe and reentrant. |
187 | */ |
221 | */ |
188 | #if 0 |
222 | #if 0 |
189 | void coro_destroy (coro_context *ctx); |
223 | void coro_destroy (coro_context *ctx); |
190 | #endif |
224 | #endif |
191 | |
225 | |
192 | /* |
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193 | * That was it. No other user-visible functions are implemented here. |
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194 | */ |
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195 | |
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196 | /*****************************************************************************/ |
226 | /*****************************************************************************/ |
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227 | /* optional stack management */ |
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228 | /*****************************************************************************/ |
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229 | /* |
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230 | * You can disable all of the stack management functions by |
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231 | * defining CORO_STACKALLOC to 0. Otherwise, they are enabled by default. |
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232 | * |
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233 | * If stack management is enabled, you can influence the implementation via these |
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234 | * symbols: |
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235 | * |
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236 | * -DCORO_USE_VALGRIND |
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237 | * |
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238 | * If defined, then libcoro will include valgrind/valgrind.h and register |
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239 | * and unregister stacks with valgrind. |
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240 | * |
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241 | * -DCORO_GUARDPAGES=n |
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242 | * |
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243 | * libcoro will try to use the specified number of guard pages to protect against |
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244 | * stack overflow. If n is 0, then the feature will be disabled. If it isn't |
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245 | * defined, then libcoro will choose a suitable default. If guardpages are not |
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246 | * supported on the platform, then the feature will be silently disabled. |
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247 | */ |
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248 | #ifndef CORO_STACKALLOC |
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249 | # define CORO_STACKALLOC 1 |
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250 | #endif |
197 | |
251 | |
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252 | #if CORO_STACKALLOC |
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253 | |
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254 | /* |
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255 | * The only allowed operations on these struct members is to read the |
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256 | * "sptr" and "ssze" members to pass it to coro_create, to read the "sptr" |
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257 | * member to see if it is false, in which case the stack isn't allocated, |
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258 | * and to set the "sptr" member to 0, to indicate to coro_stack_free to |
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259 | * not actually do anything. |
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260 | */ |
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261 | |
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262 | struct coro_stack |
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263 | { |
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264 | void *sptr; |
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265 | size_t ssze; |
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266 | #if CORO_USE_VALGRIND |
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267 | int valgrind_id; |
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268 | #endif |
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269 | }; |
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270 | |
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271 | /* |
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272 | * Try to allocate a stack of at least the given size and return true if |
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273 | * successful, or false otherwise. |
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274 | * |
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275 | * The size is *NOT* specified in bytes, but in units of sizeof (void *), |
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276 | * i.e. the stack is typically 4(8) times larger on 32 bit(64 bit) platforms |
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277 | * then the size passed in. |
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278 | * |
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279 | * If size is 0, then a "suitable" stack size is chosen (usually 1-2MB). |
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280 | */ |
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281 | int coro_stack_alloc (struct coro_stack *stack, unsigned int size); |
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282 | |
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283 | /* |
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284 | * Free the stack allocated by coro_stack_alloc again. It is safe to |
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285 | * call this function on the coro_stack structure even if coro_stack_alloc |
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286 | * failed. |
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287 | */ |
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288 | void coro_stack_free (struct coro_stack *stack); |
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289 | |
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290 | #endif |
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291 | |
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292 | /* |
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293 | * That was it. No other user-serviceable parts below here. |
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294 | */ |
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295 | |
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296 | /*****************************************************************************/ |
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297 | |
198 | #if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \ |
298 | #if !defined CORO_LOSER && !defined CORO_UCONTEXT \ |
199 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ |
299 | && !defined CORO_SJLJ && !defined CORO_LINUX \ |
200 | && !defined(CORO_IRIX) && !defined(CORO_ASM) \ |
300 | && !defined CORO_IRIX && !defined CORO_ASM \ |
201 | && !defined(CORO_PTHREAD) |
301 | && !defined CORO_PTHREAD && !defined CORO_FIBER |
202 | # if defined(WINDOWS) |
302 | # if defined WINDOWS && (defined __i386 || (__x86_64 || defined _M_IX86 || defined _M_AMD64) |
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303 | # define CORO_ASM 1 |
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304 | # elif defined WINDOWS || defined _WIN32 |
203 | # define CORO_LOSER 1 /* you don't win with windoze */ |
305 | # define CORO_LOSER 1 /* you don't win with windoze */ |
204 | # elif defined(__linux) && (defined(__x86) || defined (__amd64)) |
306 | # elif __linux && (__i386 || (__x86_64 && !__ILP32)) |
205 | # define CORO_ASM 1 |
307 | # define CORO_ASM 1 |
206 | # elif defined(HAVE_UCONTEXT_H) |
308 | # elif defined HAVE_UCONTEXT_H |
207 | # define CORO_UCONTEXT 1 |
309 | # define CORO_UCONTEXT 1 |
208 | # elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) |
310 | # elif defined HAVE_SETJMP_H && defined HAVE_SIGALTSTACK |
209 | # define CORO_SJLJ 1 |
311 | # define CORO_SJLJ 1 |
210 | # else |
312 | # else |
211 | error unknown or unsupported architecture |
313 | error unknown or unsupported architecture |
212 | # endif |
314 | # endif |
213 | #endif |
315 | #endif |
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216 | |
318 | |
217 | #if CORO_UCONTEXT |
319 | #if CORO_UCONTEXT |
218 | |
320 | |
219 | # include <ucontext.h> |
321 | # include <ucontext.h> |
220 | |
322 | |
221 | struct coro_context { |
323 | struct coro_context |
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324 | { |
222 | ucontext_t uc; |
325 | ucontext_t uc; |
223 | }; |
326 | }; |
224 | |
327 | |
225 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
328 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
226 | # define coro_destroy(ctx) (void *)(ctx) |
329 | # define coro_destroy(ctx) (void *)(ctx) |
227 | |
330 | |
228 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
331 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
229 | |
332 | |
230 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
333 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
231 | # define _GNU_SOURCE /* for linux libc */ |
334 | # define _GNU_SOURCE /* for glibc */ |
232 | # endif |
335 | # endif |
233 | |
336 | |
234 | # if !CORO_LOSER |
337 | # if !CORO_LOSER |
235 | # include <unistd.h> |
338 | # include <unistd.h> |
236 | # endif |
339 | # endif |
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255 | # define coro_jmp_buf sigjmp_buf |
358 | # define coro_jmp_buf sigjmp_buf |
256 | # define coro_setjmp(env) sigsetjmp (env, 0) |
359 | # define coro_setjmp(env) sigsetjmp (env, 0) |
257 | # define coro_longjmp(env) siglongjmp ((env), 1) |
360 | # define coro_longjmp(env) siglongjmp ((env), 1) |
258 | # endif |
361 | # endif |
259 | |
362 | |
260 | struct coro_context { |
363 | struct coro_context |
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364 | { |
261 | coro_jmp_buf env; |
365 | coro_jmp_buf env; |
262 | }; |
366 | }; |
263 | |
367 | |
264 | # define coro_transfer(p,n) do { if (!coro_setjmp ((p)->env)) coro_longjmp ((n)->env); } while (0) |
368 | # define coro_transfer(p,n) do { if (!coro_setjmp ((p)->env)) coro_longjmp ((n)->env); } while (0) |
265 | # define coro_destroy(ctx) (void *)(ctx) |
369 | # define coro_destroy(ctx) (void *)(ctx) |
266 | |
370 | |
267 | #elif CORO_ASM |
371 | #elif CORO_ASM |
268 | |
372 | |
269 | struct coro_context { |
373 | struct coro_context |
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374 | { |
270 | void **sp; /* must be at offset 0 */ |
375 | void **sp; /* must be at offset 0 */ |
271 | }; |
376 | }; |
272 | |
377 | |
273 | void __attribute__ ((__noinline__, __regparm__(2))) |
378 | void __attribute__ ((__noinline__, __regparm__(2))) |
274 | coro_transfer (coro_context *prev, coro_context *next); |
379 | coro_transfer (coro_context *prev, coro_context *next); |
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279 | |
384 | |
280 | # include <pthread.h> |
385 | # include <pthread.h> |
281 | |
386 | |
282 | extern pthread_mutex_t coro_mutex; |
387 | extern pthread_mutex_t coro_mutex; |
283 | |
388 | |
284 | struct coro_context { |
389 | struct coro_context |
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390 | { |
285 | pthread_cond_t cv; |
391 | pthread_cond_t cv; |
286 | pthread_t id; |
392 | pthread_t id; |
287 | }; |
393 | }; |
288 | |
394 | |
289 | void coro_transfer (coro_context *prev, coro_context *next); |
395 | void coro_transfer (coro_context *prev, coro_context *next); |
290 | void coro_destroy (coro_context *ctx); |
396 | void coro_destroy (coro_context *ctx); |
291 | |
397 | |
292 | #endif |
398 | #elif CORO_FIBER |
293 | |
399 | |
294 | #endif |
400 | struct coro_context |
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401 | { |
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402 | void *fiber; |
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403 | /* only used for initialisation */ |
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404 | coro_func coro; |
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405 | void *arg; |
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406 | }; |
295 | |
407 | |
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408 | void coro_transfer (coro_context *prev, coro_context *next); |
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409 | void coro_destroy (coro_context *ctx); |
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410 | |
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411 | #endif |
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412 | |
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413 | #if __cplusplus |
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414 | } |
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415 | #endif |
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416 | |
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417 | #endif |
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418 | |