1 | /* |
1 | /* |
2 | * Copyright (c) 2001 Marc Alexander Lehmann <pcg@goof.com> |
2 | * Copyright (c) 2001-2005 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, |
… | |
… | |
28 | * This library is modelled strictly after Ralf S. Engelschalls article at |
28 | * 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 |
29 | * http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must |
30 | * go to Ralf S. Engelschall <rse@engelschall.com>. |
30 | * go to Ralf S. Engelschall <rse@engelschall.com>. |
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 avstraction 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 | * |
36 | * VERSION: 0.1 |
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37 | */ |
36 | */ |
38 | |
37 | |
39 | #ifndef CORO_H |
38 | #ifndef CORO_H |
40 | #define CORO_H |
39 | #define CORO_H |
41 | |
40 | |
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41 | #define CORO_VERSION 2 |
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42 | |
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43 | /* |
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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 | |
42 | /* |
48 | /* |
43 | * This library consists of only three files |
49 | * This library consists of only three files |
44 | * coro.h, coro.c and LICENSE |
50 | * coro.h, coro.c and LICENSE (and optionally README) |
45 | * |
51 | * |
46 | * It implements what is known as coroutines, in a hopefully |
52 | * It implements what is known as coroutines, in a hopefully |
47 | * portable way. At the moment you have to define which kind |
53 | * portable way. At the moment you have to define which kind |
48 | * of implementation flavour you want: |
54 | * of implementation flavour you want: |
49 | * |
55 | * |
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65 | * -DCORO_LINUX |
71 | * -DCORO_LINUX |
66 | * |
72 | * |
67 | * Old GNU/Linux systems (<= glibc-2.1) work with this implementation |
73 | * Old GNU/Linux systems (<= glibc-2.1) work with this implementation |
68 | * (very fast). |
74 | * (very fast). |
69 | * |
75 | * |
70 | * -DCORO_LOOSE |
76 | * -DCORO_LOSER |
71 | * |
77 | * |
72 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
78 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
73 | * this automatically selects a suitable workaround for this platform. |
79 | * this automatically selects a suitable workaround for this platform. |
74 | * (untested) |
80 | * (untested) |
75 | * |
81 | * |
76 | * -DCORO_IRIX |
82 | * -DCORO_IRIX |
77 | * |
83 | * |
78 | * SGI's version of Microsoft's NT ;) |
84 | * SGI's version of Microsoft's NT ;) |
79 | * |
85 | * |
80 | * If you define neither of these symbols, coro.h will try to autodetect |
86 | * If you define neither of these symbols, coro.h will try to autodetect |
81 | * the model. This currently works for CORO_LOOSE only. For the other |
87 | * the model. This currently works for CORO_LOSER only. For the other |
82 | * alternatives you should check (e.g. using autoconf) and define the |
88 | * alternatives you should check (e.g. using autoconf) and define the |
83 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
89 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
84 | */ |
90 | */ |
85 | |
91 | |
86 | /* |
92 | /* |
87 | * This is the type for the top function of a new coroutine. |
93 | * This is the type for the initialization function of a new coroutine. |
88 | */ |
94 | */ |
89 | typedef void (*coro_func)(void *); |
95 | typedef void (*coro_func)(void *); |
90 | |
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91 | |
96 | |
92 | /* |
97 | /* |
93 | * A coroutine state is saved in the following structure. Treat it as a |
98 | * A coroutine state is saved in the following structure. Treat it as a |
94 | * opaque type. errno and sigmask might be saved, but don't rely on it, |
99 | * opaque type. errno and sigmask might be saved, but don't rely on it, |
95 | * implement your own switching primitive. |
100 | * implement your own switching primitive. |
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102 | * and the single pointer value that is given to it as argument. |
107 | * and the single pointer value that is given to it as argument. |
103 | * |
108 | * |
104 | * Allocating/deallocating the stack is your own responsibility, so there is |
109 | * Allocating/deallocating the stack is your own responsibility, so there is |
105 | * no coro_destroy function. |
110 | * no coro_destroy function. |
106 | */ |
111 | */ |
107 | void coro_create(coro_context *ctx, |
112 | void coro_create (coro_context *ctx, |
108 | coro_func coro, void *arg, |
113 | coro_func coro, void *arg, |
109 | void *sptr, long ssize); |
114 | void *sptr, long ssize); |
110 | |
115 | |
111 | /* |
116 | /* |
112 | * The following prototype defines the coroutine switching function. It is |
117 | * The following prototype defines the coroutine switching function. It is |
113 | * usually implemented as a macro, so watch out. |
118 | * usually implemented as a macro, so watch out. |
114 | * |
119 | * |
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119 | * That was it. No other user-visible functions are implemented here. |
124 | * That was it. No other user-visible functions are implemented here. |
120 | */ |
125 | */ |
121 | |
126 | |
122 | /*****************************************************************************/ |
127 | /*****************************************************************************/ |
123 | |
128 | |
124 | #if !defined(CORO_LOOSE) && !defined(CORO_UCONTEXT) \ |
129 | #if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \ |
125 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ |
130 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ |
126 | && !defined(CORO_IRIX) |
131 | && !defined(CORO_IRIX) |
127 | # if defined(WINDOWS) |
132 | # if defined(WINDOWS) |
128 | # define CORO_LOOSE 1 /* you don't win with windoze */ |
133 | # define CORO_LOSER 1 /* you don't win with windoze */ |
129 | # elif defined(__linux) && defined(__x86) |
134 | # elif defined(__linux) && defined(__x86) |
130 | # elif defined(HAVE_UCONTEXT_H) |
135 | # elif defined(HAVE_UCONTEXT_H) |
131 | # define CORO_UCONTEXT 1 |
136 | # define CORO_UCONTEXT 1 |
132 | # elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) |
137 | # elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) |
133 | # define CORO_SJLJ 1 |
138 | # define CORO_SJLJ 1 |
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144 | |
149 | |
145 | struct coro_context { |
150 | struct coro_context { |
146 | ucontext_t uc; |
151 | ucontext_t uc; |
147 | }; |
152 | }; |
148 | |
153 | |
149 | #define coro_transfer(p,n) swapcontext(&((p)->uc), &((n)->uc)) |
154 | #define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
150 | |
155 | |
151 | #elif CORO_SJLJ || CORO_LOOSE || CORO_LINUX || CORO_IRIX |
156 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
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157 | |
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158 | #if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
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159 | # define _GNU_SOURCE // for linux libc |
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160 | #endif |
152 | |
161 | |
153 | #include <setjmp.h> |
162 | #include <setjmp.h> |
154 | |
163 | |
155 | struct coro_context { |
164 | struct coro_context { |
156 | jmp_buf env; |
165 | jmp_buf env; |
157 | }; |
166 | }; |
158 | |
167 | |
159 | #define coro_transfer(p,n) if (!setjmp ((p)->env)) longjmp ((n)->env, 1) |
168 | #define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while(0) |
160 | |
169 | |
161 | #endif |
170 | #endif |
162 | |
171 | |
163 | #endif |
172 | #endif |
164 | |
173 | |