1 | /* |
1 | /* |
2 | * Copyright (c) 2001-2005 Marc Alexander Lehmann <schmorp@schmorp.de> |
2 | * Copyright (c) 2001-2012,2015 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 | * 3. The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * 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 |
18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
15 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
16 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
20 | * 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- |
21 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
18 | * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
… | |
… | |
23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
20 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
21 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
22 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
26 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
23 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | * |
24 | * |
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25 | * Alternatively, the contents of this file may be used under the terms of |
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26 | * the GNU General Public License ("GPL") version 2 or any later version, |
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27 | * in which case the provisions of the GPL are applicable instead of |
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28 | * the above. If you wish to allow the use of your version of this file |
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29 | * only under the terms of the GPL and not to allow others to use your |
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30 | * version of this file under the BSD license, indicate your decision |
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31 | * by deleting the provisions above and replace them with the notice |
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32 | * and other provisions required by the GPL. If you do not delete the |
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33 | * provisions above, a recipient may use your version of this file under |
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34 | * either the BSD or the GPL. |
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35 | * |
28 | * This library is modelled strictly after Ralf S. Engelschalls article at |
36 | * This library is modelled strictly after Ralf S. Engelschalls article at |
29 | * http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must |
37 | * http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must |
30 | * go to Ralf S. Engelschall <rse@engelschall.com>. |
38 | * go to Ralf S. Engelschall <rse@engelschall.com>. |
31 | * |
39 | * |
32 | * This coroutine library is very much stripped down. You should either |
40 | * This coroutine library is very much stripped down. You should either |
33 | * build your own process abstraction using it or - better - just use GNU |
41 | * build your own process abstraction using it or - better - just use GNU |
34 | * Portable Threads, http://www.gnu.org/software/pth/. |
42 | * Portable Threads, http://www.gnu.org/software/pth/. |
35 | * |
43 | * |
36 | */ |
44 | */ |
37 | |
45 | |
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46 | /* |
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47 | * 2006-10-26 Include stddef.h on OS X to work around one of its bugs. |
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48 | * Reported by Michael_G_Schwern. |
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49 | * 2006-11-26 Use _setjmp instead of setjmp on GNU/Linux. |
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50 | * 2007-04-27 Set unwind frame info if gcc 3+ and ELF is detected. |
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51 | * Use _setjmp instead of setjmp on _XOPEN_SOURCE >= 600. |
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52 | * 2007-05-02 Add assembly versions for x86 and amd64 (to avoid reliance |
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53 | * on SIGUSR2 and sigaltstack in Crossfire). |
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54 | * 2008-01-21 Disable CFI usage on anything but GNU/Linux. |
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55 | * 2008-03-02 Switched to 2-clause BSD license with GPL exception. |
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56 | * 2008-04-04 New (but highly unrecommended) pthreads backend. |
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57 | * 2008-04-24 Reinstate CORO_LOSER (had wrong stack adjustments). |
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58 | * 2008-10-30 Support assembly method on x86 with and without frame pointer. |
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59 | * 2008-11-03 Use a global asm statement for CORO_ASM, idea by pippijn. |
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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). |
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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. |
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82 | * 2015-12-05 experimental asm be for arm7, based on a patch by Nick Zavaritsky. |
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83 | * use __name__ for predefined symbols, as in libecb. |
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84 | * enable guard pages on arm, aarch64 and mips. |
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85 | * 2016-08-27 try to disable _FORTIFY_SOURCE with CORO_SJLJ, as it |
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86 | * breaks setjmp/longjmp. |
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87 | */ |
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88 | |
38 | #ifndef CORO_H |
89 | #ifndef CORO_H |
39 | #define CORO_H |
90 | #define CORO_H |
40 | |
91 | |
41 | #define CORO_VERSION 2 |
92 | #if __cplusplus |
42 | |
93 | extern "C" { |
43 | /* |
94 | #endif |
44 | * Changes since API version 1: |
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45 | * replaced bogus -DCORO_LOOSE with gramatically more correct -DCORO_LOSER |
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46 | */ |
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47 | |
95 | |
48 | /* |
96 | /* |
49 | * This library consists of only three files |
97 | * This library consists of only three files |
50 | * coro.h, coro.c and LICENSE (and optionally README) |
98 | * coro.h, coro.c and LICENSE (and optionally README) |
51 | * |
99 | * |
52 | * It implements what is known as coroutines, in a hopefully |
100 | * It implements what is known as coroutines, in a hopefully |
53 | * portable way. At the moment you have to define which kind |
101 | * portable way. |
54 | * of implementation flavour you want: |
102 | * |
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103 | * All compiletime symbols must be defined both when including coro.h |
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104 | * (using libcoro) as well as when compiling coro.c (the implementation). |
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105 | * |
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106 | * You can manually specify which flavour you want. If you don't define |
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107 | * any of these, libcoro tries to choose a safe and fast default: |
55 | * |
108 | * |
56 | * -DCORO_UCONTEXT |
109 | * -DCORO_UCONTEXT |
57 | * |
110 | * |
58 | * This flavour uses SUSv2's get/set/swap/makecontext functions that |
111 | * This flavour uses SUSv2's get/set/swap/makecontext functions that |
59 | * unfortunately only newer unices support. |
112 | * unfortunately only some unices support, and is quite slow. |
60 | * Use this for GNU/Linux + glibc-2.2.3 and possibly higher. |
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61 | * |
113 | * |
62 | * -DCORO_SJLJ |
114 | * -DCORO_SJLJ |
63 | * |
115 | * |
64 | * This flavour uses SUSv2's setjmp/longjmp and sigaltstack functions to |
116 | * This flavour uses SUSv2's setjmp/longjmp and sigaltstack functions to |
65 | * do it's job. Coroutine creation is much slower than UCONTEXT, but |
117 | * do it's job. Coroutine creation is much slower than UCONTEXT, but |
66 | * context switching is often a bit cheaper. It should work on almost |
118 | * context switching is a bit cheaper. It should work on almost all unices. |
67 | * all unices. Use this for GNU/Linux + glibc-2.2. glibc-2.1 and below |
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68 | * do not work with any sane model (neither sigaltstack nor context |
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69 | * functions are implemented) |
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70 | * |
119 | * |
71 | * -DCORO_LINUX |
120 | * -DCORO_LINUX |
72 | * |
121 | * |
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122 | * CORO_SJLJ variant. |
73 | * Old GNU/Linux systems (<= glibc-2.1) work with this implementation |
123 | * Old GNU/Linux systems (<= glibc-2.1) only work with this implementation |
74 | * (it is very fast and therefore recommended over other methods). |
124 | * (it is very fast and therefore recommended over other methods, but |
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125 | * doesn't work with anything newer). |
75 | * |
126 | * |
76 | * -DCORO_LOSER |
127 | * -DCORO_LOSER |
77 | * |
128 | * |
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129 | * CORO_SJLJ variant. |
78 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
130 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
79 | * this automatically selects a suitable workaround for this platform. |
131 | * this selects a suitable workaround for this platform. It might not work |
80 | * (untested) |
132 | * with your compiler though - it has only been tested with MSVC 6. |
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133 | * |
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134 | * -DCORO_FIBER |
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135 | * |
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136 | * Slower, but probably more portable variant for the Microsoft operating |
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137 | * system, using fibers. Ignores the passed stack and allocates it internally. |
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138 | * Also, due to bugs in cygwin, this does not work with cygwin. |
81 | * |
139 | * |
82 | * -DCORO_IRIX |
140 | * -DCORO_IRIX |
83 | * |
141 | * |
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142 | * CORO_SJLJ variant. |
84 | * SGI's version of Microsoft's NT ;) |
143 | * For SGI's version of Microsoft's NT ;) |
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144 | * |
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145 | * -DCORO_ASM |
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146 | * |
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147 | * Hand coded assembly, known to work only on a few architectures/ABI: |
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148 | * GCC + arm7/x86/IA32/amd64/x86_64 + GNU/Linux and a few BSDs. Fastest |
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149 | * choice, if it works. |
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150 | * |
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151 | * -DCORO_PTHREAD |
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152 | * |
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153 | * Use the pthread API. You have to provide <pthread.h> and -lpthread. |
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154 | * This is likely the slowest backend, and it also does not support fork(), |
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155 | * so avoid it at all costs. |
85 | * |
156 | * |
86 | * If you define neither of these symbols, coro.h will try to autodetect |
157 | * If you define neither of these symbols, coro.h will try to autodetect |
87 | * the model. This currently works for CORO_LOSER only. For the other |
158 | * the best/safest model. To help with the autodetection, you should check |
88 | * alternatives you should check (e.g. using autoconf) and define the |
159 | * (e.g. using autoconf) and define the following symbols: HAVE_UCONTEXT_H |
89 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
160 | * / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
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161 | */ |
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162 | |
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163 | /* |
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164 | * Changes when the API changes incompatibly. |
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165 | * This is ONLY the API version - there is no ABI compatibility between releases. |
90 | */ |
166 | * |
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167 | * Changes in API version 2: |
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168 | * replaced bogus -DCORO_LOOSE with grammatically more correct -DCORO_LOSER |
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169 | * Changes in API version 3: |
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170 | * introduced stack management (CORO_STACKALLOC) |
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171 | */ |
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172 | #define CORO_VERSION 3 |
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173 | |
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174 | #include <stddef.h> |
91 | |
175 | |
92 | /* |
176 | /* |
93 | * This is the type for the initialization function of a new coroutine. |
177 | * This is the type for the initialization function of a new coroutine. |
94 | */ |
178 | */ |
95 | typedef void (*coro_func)(void *); |
179 | typedef void (*coro_func)(void *); |
96 | |
180 | |
97 | /* |
181 | /* |
98 | * A coroutine state is saved in the following structure. Treat it as a |
182 | * A coroutine state is saved in the following structure. Treat it as an |
99 | * opaque type. errno and sigmask might be saved, but don't rely on it, |
183 | * opaque type. errno and sigmask might be saved, but don't rely on it, |
100 | * implement your own switching primitive. |
184 | * implement your own switching primitive if you need that. |
101 | */ |
185 | */ |
102 | typedef struct coro_context coro_context; |
186 | typedef struct coro_context coro_context; |
103 | |
187 | |
104 | /* |
188 | /* |
105 | * This function creates a new coroutine. Apart from a pointer to an |
189 | * This function creates a new coroutine. Apart from a pointer to an |
106 | * uninitialised coro_context, it expects a pointer to the entry function |
190 | * uninitialised coro_context, it expects a pointer to the entry function |
107 | * and the single pointer value that is given to it as argument. |
191 | * and the single pointer value that is given to it as argument. |
108 | * |
192 | * |
109 | * Allocating/deallocating the stack is your own responsibility, so there is |
193 | * Allocating/deallocating the stack is your own responsibility. |
110 | * no coro_destroy function. |
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111 | */ |
194 | * |
112 | void coro_create (coro_context *ctx, |
195 | * As a special case, if coro, arg, sptr and ssze are all zero, |
113 | coro_func coro, void *arg, |
196 | * then an "empty" coro_context will be created that is suitable |
114 | void *sptr, long ssize); |
197 | * as an initial source for coro_transfer. |
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198 | * |
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199 | * This function is not reentrant, but putting a mutex around it |
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200 | * will work. |
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201 | */ |
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202 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
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203 | coro_func coro, /* the coroutine code to be executed */ |
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204 | void *arg, /* a single pointer passed to the coro */ |
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205 | void *sptr, /* start of stack area */ |
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206 | size_t ssze); /* size of stack area in bytes */ |
115 | |
207 | |
116 | /* |
208 | /* |
117 | * The following prototype defines the coroutine switching function. It is |
209 | * The following prototype defines the coroutine switching function. It is |
118 | * usually implemented as a macro, so watch out. |
210 | * sometimes implemented as a macro, so watch out. |
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211 | * |
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212 | * This function is thread-safe and reentrant. |
119 | * |
213 | */ |
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214 | #if 0 |
120 | void coro_transfer(coro_context *prev, coro_context *next); |
215 | void coro_transfer (coro_context *prev, coro_context *next); |
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216 | #endif |
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217 | |
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218 | /* |
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219 | * The following prototype defines the coroutine destroy function. It |
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220 | * is sometimes implemented as a macro, so watch out. It also serves no |
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221 | * purpose unless you want to use the CORO_PTHREAD backend, where it is |
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222 | * used to clean up the thread. You are responsible for freeing the stack |
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223 | * and the context itself. |
121 | */ |
224 | * |
122 | |
225 | * This function is thread-safe and reentrant. |
123 | /* |
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124 | * That was it. No other user-visible functions are implemented here. |
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125 | */ |
226 | */ |
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227 | #if 0 |
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228 | void coro_destroy (coro_context *ctx); |
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229 | #endif |
126 | |
230 | |
127 | /*****************************************************************************/ |
231 | /*****************************************************************************/ |
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232 | /* optional stack management */ |
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233 | /*****************************************************************************/ |
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234 | /* |
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235 | * You can disable all of the stack management functions by |
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236 | * defining CORO_STACKALLOC to 0. Otherwise, they are enabled by default. |
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237 | * |
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238 | * If stack management is enabled, you can influence the implementation via these |
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239 | * symbols: |
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240 | * |
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241 | * -DCORO_USE_VALGRIND |
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242 | * |
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243 | * If defined, then libcoro will include valgrind/valgrind.h and register |
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244 | * and unregister stacks with valgrind. |
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245 | * |
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246 | * -DCORO_GUARDPAGES=n |
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247 | * |
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248 | * libcoro will try to use the specified number of guard pages to protect against |
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249 | * stack overflow. If n is 0, then the feature will be disabled. If it isn't |
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250 | * defined, then libcoro will choose a suitable default. If guardpages are not |
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251 | * supported on the platform, then the feature will be silently disabled. |
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252 | */ |
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253 | #ifndef CORO_STACKALLOC |
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254 | # define CORO_STACKALLOC 1 |
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255 | #endif |
128 | |
256 | |
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257 | #if CORO_STACKALLOC |
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258 | |
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259 | /* |
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260 | * The only allowed operations on these struct members is to read the |
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261 | * "sptr" and "ssze" members to pass it to coro_create, to read the "sptr" |
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262 | * member to see if it is false, in which case the stack isn't allocated, |
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263 | * and to set the "sptr" member to 0, to indicate to coro_stack_free to |
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264 | * not actually do anything. |
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265 | */ |
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266 | |
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267 | struct coro_stack |
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268 | { |
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269 | void *sptr; |
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270 | size_t ssze; |
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271 | #if CORO_USE_VALGRIND |
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272 | int valgrind_id; |
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273 | #endif |
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274 | }; |
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275 | |
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276 | /* |
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277 | * Try to allocate a stack of at least the given size and return true if |
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278 | * successful, or false otherwise. |
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279 | * |
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280 | * The size is *NOT* specified in bytes, but in units of sizeof (void *), |
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281 | * i.e. the stack is typically 4(8) times larger on 32 bit(64 bit) platforms |
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282 | * then the size passed in. |
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283 | * |
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284 | * If size is 0, then a "suitable" stack size is chosen (usually 1-2MB). |
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285 | */ |
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286 | int coro_stack_alloc (struct coro_stack *stack, unsigned int size); |
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287 | |
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288 | /* |
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289 | * Free the stack allocated by coro_stack_alloc again. It is safe to |
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290 | * call this function on the coro_stack structure even if coro_stack_alloc |
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291 | * failed. |
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292 | */ |
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293 | void coro_stack_free (struct coro_stack *stack); |
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294 | |
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295 | #endif |
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296 | |
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297 | /* |
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298 | * That was it. No other user-serviceable parts below here. |
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299 | */ |
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300 | |
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301 | /*****************************************************************************/ |
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302 | |
129 | #if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \ |
303 | #if !defined CORO_LOSER && !defined CORO_UCONTEXT \ |
130 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ |
304 | && !defined CORO_SJLJ && !defined CORO_LINUX \ |
131 | && !defined(CORO_IRIX) |
305 | && !defined CORO_IRIX && !defined CORO_ASM \ |
132 | # if defined(WINDOWS) |
306 | && !defined CORO_PTHREAD && !defined CORO_FIBER |
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307 | # if defined WINDOWS && (defined __i386__ || (__x86_64__ || defined _M_IX86 || defined _M_AMD64) |
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308 | # define CORO_ASM 1 |
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309 | # elif defined WINDOWS || defined _WIN32 |
133 | # define CORO_LOSER 1 /* you don't win with windoze */ |
310 | # define CORO_LOSER 1 /* you don't win with windoze */ |
134 | # elif defined(__linux) && defined(__x86) |
311 | # elif __linux && (__i386__ || (__x86_64__ && !__ILP32__) || (__arm__ && __ARM_ARCH == 7)) |
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312 | # define CORO_ASM 1 |
135 | # elif defined(HAVE_UCONTEXT_H) |
313 | # elif defined HAVE_UCONTEXT_H |
136 | # define CORO_UCONTEXT 1 |
314 | # define CORO_UCONTEXT 1 |
137 | # elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) |
315 | # elif defined HAVE_SETJMP_H && defined HAVE_SIGALTSTACK |
138 | # define CORO_SJLJ 1 |
316 | # define CORO_SJLJ 1 |
139 | # else |
317 | # else |
140 | error unknown or unsupported architecture |
318 | error unknown or unsupported architecture |
141 | # endif |
319 | # endif |
142 | #endif |
320 | #endif |
143 | |
321 | |
144 | /*****************************************************************************/ |
322 | /*****************************************************************************/ |
145 | |
323 | |
146 | #if CORO_UCONTEXT |
324 | #if CORO_UCONTEXT |
147 | |
325 | |
148 | #include <ucontext.h> |
326 | # include <ucontext.h> |
149 | |
327 | |
150 | struct coro_context { |
328 | struct coro_context |
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329 | { |
151 | ucontext_t uc; |
330 | ucontext_t uc; |
152 | }; |
331 | }; |
153 | |
332 | |
154 | #define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
333 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
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334 | # define coro_destroy(ctx) (void *)(ctx) |
155 | |
335 | |
156 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
336 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
157 | |
337 | |
158 | #if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
338 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
159 | # define _GNU_SOURCE // for linux libc |
339 | # define _GNU_SOURCE /* for glibc */ |
160 | #endif |
340 | # endif |
161 | |
341 | |
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342 | /* try to disable well-meant but buggy checks in some libcs */ |
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343 | # ifdef _FORTIFY_SOURCE |
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344 | # undef _FORTIFY_SOURCE |
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345 | # undef __USE_FORTIFY_LEVEL /* helps some more when too much has been included already */ |
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346 | # endif |
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347 | |
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348 | # if !CORO_LOSER |
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349 | # include <unistd.h> |
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350 | # endif |
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351 | |
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352 | /* solaris is hopelessly borked, it expands _XOPEN_UNIX to nothing */ |
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353 | # if __sun |
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354 | # undef _XOPEN_UNIX |
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355 | # define _XOPEN_UNIX 1 |
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356 | # endif |
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357 | |
162 | #include <setjmp.h> |
358 | # include <setjmp.h> |
163 | |
359 | |
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360 | # if _XOPEN_UNIX > 0 || defined (_setjmp) |
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361 | # define coro_jmp_buf jmp_buf |
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362 | # define coro_setjmp(env) _setjmp (env) |
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363 | # define coro_longjmp(env) _longjmp ((env), 1) |
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364 | # elif CORO_LOSER |
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365 | # define coro_jmp_buf jmp_buf |
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366 | # define coro_setjmp(env) setjmp (env) |
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367 | # define coro_longjmp(env) longjmp ((env), 1) |
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368 | # else |
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369 | # define coro_jmp_buf sigjmp_buf |
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370 | # define coro_setjmp(env) sigsetjmp (env, 0) |
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371 | # define coro_longjmp(env) siglongjmp ((env), 1) |
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372 | # endif |
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373 | |
164 | struct coro_context { |
374 | struct coro_context |
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375 | { |
165 | jmp_buf env; |
376 | coro_jmp_buf env; |
166 | }; |
377 | }; |
167 | |
378 | |
168 | #define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while(0) |
379 | # define coro_transfer(p,n) do { if (!coro_setjmp ((p)->env)) coro_longjmp ((n)->env); } while (0) |
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380 | # define coro_destroy(ctx) (void *)(ctx) |
169 | |
381 | |
170 | #endif |
382 | #elif CORO_ASM |
171 | |
383 | |
172 | #endif |
384 | struct coro_context |
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385 | { |
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386 | void **sp; /* must be at offset 0 */ |
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387 | }; |
173 | |
388 | |
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389 | #if __i386__ || __x86_64__ |
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390 | void __attribute__ ((__noinline__, __regparm__(2))) |
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391 | #else |
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392 | void __attribute__ ((__noinline__)) |
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393 | #endif |
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394 | coro_transfer (coro_context *prev, coro_context *next); |
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395 | |
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396 | # define coro_destroy(ctx) (void *)(ctx) |
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397 | |
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398 | #elif CORO_PTHREAD |
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399 | |
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400 | # include <pthread.h> |
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401 | |
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402 | extern pthread_mutex_t coro_mutex; |
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403 | |
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404 | struct coro_context |
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405 | { |
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406 | pthread_cond_t cv; |
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407 | pthread_t id; |
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408 | }; |
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409 | |
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410 | void coro_transfer (coro_context *prev, coro_context *next); |
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411 | void coro_destroy (coro_context *ctx); |
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412 | |
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413 | #elif CORO_FIBER |
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414 | |
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415 | struct coro_context |
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416 | { |
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417 | void *fiber; |
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418 | /* only used for initialisation */ |
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419 | coro_func coro; |
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420 | void *arg; |
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421 | }; |
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422 | |
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423 | void coro_transfer (coro_context *prev, coro_context *next); |
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424 | void coro_destroy (coro_context *ctx); |
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425 | |
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426 | #endif |
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427 | |
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428 | #if __cplusplus |
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429 | } |
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430 | #endif |
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431 | |
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432 | #endif |
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433 | |