1 | /* |
1 | /* |
2 | * Copyright (c) 2001-2005 Marc Alexander Lehmann <schmorp@schmorp.de> |
2 | * Copyright (c) 2001-2006 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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31 | * |
31 | * |
32 | * This coroutine library is very much stripped down. You should either |
32 | * This coroutine library is very much stripped down. You should either |
33 | * build your own process abstraction using it or - better - just use GNU |
33 | * build your own process abstraction using it or - better - just use GNU |
34 | * Portable Threads, http://www.gnu.org/software/pth/. |
34 | * Portable Threads, http://www.gnu.org/software/pth/. |
35 | * |
35 | * |
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36 | */ |
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37 | |
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38 | /* |
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39 | * 2006-10-26 Include stddef.h on OS X to work around one of its bugs. |
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40 | * Reported by Michael_G_Schwern. |
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41 | * 2006-11-26 Use _setjmp instead of setjmp on GNU/Linux. |
36 | */ |
42 | */ |
37 | |
43 | |
38 | #ifndef CORO_H |
44 | #ifndef CORO_H |
39 | #define CORO_H |
45 | #define CORO_H |
40 | |
46 | |
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93 | * This is the type for the initialization function of a new coroutine. |
99 | * This is the type for the initialization function of a new coroutine. |
94 | */ |
100 | */ |
95 | typedef void (*coro_func)(void *); |
101 | typedef void (*coro_func)(void *); |
96 | |
102 | |
97 | /* |
103 | /* |
98 | * A coroutine state is saved in the following structure. Treat it as a |
104 | * 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, |
105 | * opaque type. errno and sigmask might be saved, but don't rely on it, |
100 | * implement your own switching primitive. |
106 | * implement your own switching primitive if you need that. |
101 | */ |
107 | */ |
102 | typedef struct coro_context coro_context; |
108 | typedef struct coro_context coro_context; |
103 | |
109 | |
104 | /* |
110 | /* |
105 | * This function creates a new coroutine. Apart from a pointer to an |
111 | * This function creates a new coroutine. Apart from a pointer to an |
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107 | * and the single pointer value that is given to it as argument. |
113 | * and the single pointer value that is given to it as argument. |
108 | * |
114 | * |
109 | * Allocating/deallocating the stack is your own responsibility, so there is |
115 | * Allocating/deallocating the stack is your own responsibility, so there is |
110 | * no coro_destroy function. |
116 | * no coro_destroy function. |
111 | */ |
117 | */ |
112 | void coro_create (coro_context *ctx, |
118 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
113 | coro_func coro, void *arg, |
119 | coro_func coro, /* the coroutine code to be executed */ |
114 | void *sptr, long ssize); |
120 | void *arg, /* a single pointer passed to the coro */ |
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121 | void *sptr, /* start of stack area */ |
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122 | long ssize); /* size of stack area */ |
115 | |
123 | |
116 | /* |
124 | /* |
117 | * The following prototype defines the coroutine switching function. It is |
125 | * The following prototype defines the coroutine switching function. It is |
118 | * usually implemented as a macro, so watch out. |
126 | * usually implemented as a macro, so watch out. |
119 | * |
127 | * |
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154 | #define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
162 | #define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
155 | |
163 | |
156 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
164 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
157 | |
165 | |
158 | #if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
166 | #if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
159 | # define _GNU_SOURCE // for linux libc |
167 | # define _GNU_SOURCE /* for linux libc */ |
160 | #endif |
168 | #endif |
161 | |
169 | |
162 | #include <setjmp.h> |
170 | #include <setjmp.h> |
163 | |
171 | |
164 | struct coro_context { |
172 | struct coro_context { |
165 | jmp_buf env; |
173 | jmp_buf env; |
166 | }; |
174 | }; |
167 | |
175 | |
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176 | #if CORO_LINUX |
168 | #define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while(0) |
177 | # define coro_transfer(p,n) do { if (!_setjmp ((p)->env)) _longjmp ((n)->env, 1); } while (0) |
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178 | #else |
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179 | # define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0) |
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180 | #endif |
169 | |
181 | |
170 | #endif |
182 | #endif |
171 | |
183 | |
172 | #endif |
184 | #endif |
173 | |
185 | |