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37 | |
37 | |
38 | /* |
38 | /* |
39 | * 2006-10-26 Include stddef.h on OS X to work around one of its bugs. |
39 | * 2006-10-26 Include stddef.h on OS X to work around one of its bugs. |
40 | * Reported by Michael_G_Schwern. |
40 | * Reported by Michael_G_Schwern. |
41 | * 2006-11-26 Use _setjmp instead of setjmp on GNU/Linux. |
41 | * 2006-11-26 Use _setjmp instead of setjmp on GNU/Linux. |
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42 | * 2007-04-27 Set unwind frame info if gcc 3+ and ELF is detected. |
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43 | * Use _setjmp instead of setjmp on _XOPEN_SOURCE >= 600. |
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44 | * 2007-05-02 Add assembly versions for x86 and amd64 (to avoid reliance |
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45 | * on SIGUSR2 and sigaltstack in Crossfire). |
42 | */ |
46 | */ |
43 | |
47 | |
44 | #ifndef CORO_H |
48 | #ifndef CORO_H |
45 | #define CORO_H |
49 | #define CORO_H |
46 | |
50 | |
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87 | * |
91 | * |
88 | * -DCORO_IRIX |
92 | * -DCORO_IRIX |
89 | * |
93 | * |
90 | * SGI's version of Microsoft's NT ;) |
94 | * SGI's version of Microsoft's NT ;) |
91 | * |
95 | * |
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96 | * -DCORO_ASM |
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97 | * |
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98 | * Handcoded assembly, known to work only on a few architectures/ABI: |
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99 | * ELF Linux x86 && amd64 when gcc is used and optimisation is turned on. |
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100 | * |
92 | * If you define neither of these symbols, coro.h will try to autodetect |
101 | * If you define neither of these symbols, coro.h will try to autodetect |
93 | * the model. This currently works for CORO_LOSER only. For the other |
102 | * the model. This currently works for CORO_LOSER only. For the other |
94 | * alternatives you should check (e.g. using autoconf) and define the |
103 | * alternatives you should check (e.g. using autoconf) and define the |
95 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
104 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
96 | */ |
105 | */ |
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99 | * This is the type for the initialization function of a new coroutine. |
108 | * This is the type for the initialization function of a new coroutine. |
100 | */ |
109 | */ |
101 | typedef void (*coro_func)(void *); |
110 | typedef void (*coro_func)(void *); |
102 | |
111 | |
103 | /* |
112 | /* |
104 | * A coroutine state is saved in the following structure. Treat it as a |
113 | * A coroutine state is saved in the following structure. Treat it as an |
105 | * opaque type. errno and sigmask might be saved, but don't rely on it, |
114 | * opaque type. errno and sigmask might be saved, but don't rely on it, |
106 | * implement your own switching primitive if you need it. |
115 | * implement your own switching primitive if you need that. |
107 | */ |
116 | */ |
108 | typedef struct coro_context coro_context; |
117 | typedef struct coro_context coro_context; |
109 | |
118 | |
110 | /* |
119 | /* |
111 | * This function creates a new coroutine. Apart from a pointer to an |
120 | * This function creates a new coroutine. Apart from a pointer to an |
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113 | * and the single pointer value that is given to it as argument. |
122 | * and the single pointer value that is given to it as argument. |
114 | * |
123 | * |
115 | * Allocating/deallocating the stack is your own responsibility, so there is |
124 | * Allocating/deallocating the stack is your own responsibility, so there is |
116 | * no coro_destroy function. |
125 | * no coro_destroy function. |
117 | */ |
126 | */ |
118 | void coro_create (coro_context *ctx, |
127 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
119 | coro_func coro, void *arg, |
128 | coro_func coro, /* the coroutine code to be executed */ |
120 | void *sptr, long ssize); |
129 | void *arg, /* a single pointer passed to the coro */ |
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130 | void *sptr, /* start of stack area */ |
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131 | long ssize); /* size of stack area */ |
121 | |
132 | |
122 | /* |
133 | /* |
123 | * The following prototype defines the coroutine switching function. It is |
134 | * The following prototype defines the coroutine switching function. It is |
124 | * usually implemented as a macro, so watch out. |
135 | * usually implemented as a macro, so watch out. |
125 | * |
136 | * |
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132 | |
143 | |
133 | /*****************************************************************************/ |
144 | /*****************************************************************************/ |
134 | |
145 | |
135 | #if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \ |
146 | #if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \ |
136 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ |
147 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ |
137 | && !defined(CORO_IRIX) |
148 | && !defined(CORO_IRIX) && !defined(CORO_ASM) |
138 | # if defined(WINDOWS) |
149 | # if defined(WINDOWS) |
139 | # define CORO_LOSER 1 /* you don't win with windoze */ |
150 | # define CORO_LOSER 1 /* you don't win with windoze */ |
140 | # elif defined(__linux) && defined(__x86) |
151 | # elif defined(__linux) && (defined(__x86) || defined (__amd64)) |
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152 | # define CORO_ASM 1 |
141 | # elif defined(HAVE_UCONTEXT_H) |
153 | # elif defined(HAVE_UCONTEXT_H) |
142 | # define CORO_UCONTEXT 1 |
154 | # define CORO_UCONTEXT 1 |
143 | # elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) |
155 | # elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) |
144 | # define CORO_SJLJ 1 |
156 | # define CORO_SJLJ 1 |
145 | # else |
157 | # else |
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149 | |
161 | |
150 | /*****************************************************************************/ |
162 | /*****************************************************************************/ |
151 | |
163 | |
152 | #if CORO_UCONTEXT |
164 | #if CORO_UCONTEXT |
153 | |
165 | |
154 | #include <ucontext.h> |
166 | # include <ucontext.h> |
155 | |
167 | |
156 | struct coro_context { |
168 | struct coro_context { |
157 | ucontext_t uc; |
169 | ucontext_t uc; |
158 | }; |
170 | }; |
159 | |
171 | |
160 | #define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
172 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
161 | |
173 | |
162 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
174 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
163 | |
175 | |
164 | #if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
176 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
165 | # define _GNU_SOURCE // for linux libc |
177 | # define _GNU_SOURCE /* for linux libc */ |
166 | #endif |
178 | # endif |
167 | |
179 | |
168 | #include <setjmp.h> |
180 | # include <setjmp.h> |
169 | |
181 | |
170 | struct coro_context { |
182 | struct coro_context { |
171 | jmp_buf env; |
183 | jmp_buf env; |
172 | }; |
184 | }; |
173 | |
185 | |
174 | #if CORO_LINUX |
186 | # if CORO_LINUX || (_XOPEN_SOURCE >= 600) |
175 | # define coro_transfer(p,n) do { if (!_setjmp ((p)->env)) _longjmp ((n)->env, 1); } while(0) |
187 | # define coro_transfer(p,n) do { if (!_setjmp ((p)->env)) _longjmp ((n)->env, 1); } while (0) |
176 | #else |
188 | # else |
177 | # define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while(0) |
189 | # define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0) |
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190 | # endif |
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191 | |
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192 | #elif CORO_ASM |
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193 | |
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194 | struct coro_context { |
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195 | volatile void **sp; |
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196 | }; |
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197 | |
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198 | void __attribute__ ((__noinline__, __fastcall__)) |
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199 | coro_transfer(coro_context *prev, coro_context *next); |
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200 | |
178 | #endif |
201 | #endif |
179 | |
202 | |
180 | #endif |
203 | #endif |
181 | |
204 | |
182 | #endif |
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183 | |
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