1 | /* |
1 | /* |
2 | * Copyright (c) 2001 Marc Alexander Lehmann <pcg@goof.com> |
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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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/. |
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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. |
35 | */ |
41 | */ |
36 | |
42 | |
37 | #ifndef CORO_H |
43 | #ifndef CORO_H |
38 | #define CORO_H |
44 | #define CORO_H |
39 | |
45 | |
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46 | #define CORO_VERSION 2 |
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47 | |
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48 | /* |
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49 | * Changes since API version 1: |
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50 | * replaced bogus -DCORO_LOOSE with gramatically more correct -DCORO_LOSER |
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51 | */ |
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52 | |
40 | /* |
53 | /* |
41 | * This library consists of only three files |
54 | * This library consists of only three files |
42 | * coro.h, coro.c and LICENSE |
55 | * coro.h, coro.c and LICENSE (and optionally README) |
43 | * |
56 | * |
44 | * It implements what is known as coroutines, in a hopefully |
57 | * It implements what is known as coroutines, in a hopefully |
45 | * portable way. At the moment you have to define which kind |
58 | * portable way. At the moment you have to define which kind |
46 | * of implementation flavour you want: |
59 | * of implementation flavour you want: |
47 | * |
60 | * |
48 | * -DCORO_UCONTEXT |
61 | * -DCORO_UCONTEXT |
49 | * |
62 | * |
50 | * This flavour uses SUSv2's get/set/swap/makecontext functions that |
63 | * This flavour uses SUSv2's get/set/swap/makecontext functions that |
51 | * unfortunately only newer unices support. |
64 | * unfortunately only newer unices support. |
52 | * Use this for GNU/Linux + glibc-2.2.3. |
65 | * Use this for GNU/Linux + glibc-2.2.3 and possibly higher. |
53 | * |
66 | * |
54 | * -DCORO_SJLJ |
67 | * -DCORO_SJLJ |
55 | * |
68 | * |
56 | * This flavour uses SUSv'2 setjmp/longjmp and sigaltstack functions to |
69 | * This flavour uses SUSv2's setjmp/longjmp and sigaltstack functions to |
57 | * do it's job. Coroutine creation is much slower than UCONTEXT, but |
70 | * do it's job. Coroutine creation is much slower than UCONTEXT, but |
58 | * context switching is often a bit cheaper. It should work on almost |
71 | * context switching is often a bit cheaper. It should work on almost |
59 | * all unices. Use this for GNU/Linux + glibc-2.2. glibc-2.1 and below |
72 | * all unices. Use this for GNU/Linux + glibc-2.2. glibc-2.1 and below |
60 | * do not work with any model (neither sigaltstack nor context functions |
73 | * do not work with any sane model (neither sigaltstack nor context |
61 | * are implemented) |
74 | * functions are implemented) |
62 | * |
75 | * |
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76 | * -DCORO_LINUX |
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77 | * |
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78 | * Old GNU/Linux systems (<= glibc-2.1) work with this implementation |
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79 | * (it is very fast and therefore recommended over other methods). |
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80 | * |
63 | * -DCORO_LOOSE |
81 | * -DCORO_LOSER |
64 | * |
82 | * |
65 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
83 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
66 | * this automatically selects a suitable workaround for this platform. |
84 | * this automatically selects a suitable workaround for this platform. |
67 | * (untested) |
85 | * (untested) |
68 | * |
86 | * |
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87 | * -DCORO_IRIX |
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88 | * |
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89 | * SGI's version of Microsoft's NT ;) |
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90 | * |
69 | * If you define neither of these symbols, coro.h will try to autodetect |
91 | * If you define neither of these symbols, coro.h will try to autodetect |
70 | * the model. This currently works for CORO_LOOSE only. For the other |
92 | * the model. This currently works for CORO_LOSER only. For the other |
71 | * alternatives you should check (e.g. using autoconf) and define the |
93 | * alternatives you should check (e.g. using autoconf) and define the |
72 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
94 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
73 | */ |
95 | */ |
74 | |
96 | |
75 | /* |
97 | /* |
76 | * This is the type for the top function of a new coroutine. |
98 | * This is the type for the initialization function of a new coroutine. |
77 | */ |
99 | */ |
78 | typedef void (*coro_func)(void *); |
100 | typedef void (*coro_func)(void *); |
79 | |
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80 | |
101 | |
81 | /* |
102 | /* |
82 | * A coroutine state is saved in the following structure. Treat it as a |
103 | * A coroutine state is saved in the following structure. Treat it as a |
83 | * opaque type. errno and sigmask might be saved, but don't rely on it, |
104 | * opaque type. errno and sigmask might be saved, but don't rely on it, |
84 | * implement your own switching primitive. |
105 | * implement your own switching primitive if you need it. |
85 | */ |
106 | */ |
86 | typedef struct coro_context coro_context; |
107 | typedef struct coro_context coro_context; |
87 | |
108 | |
88 | /* |
109 | /* |
89 | * This function creates a new coroutine. Apart from a pointer to an |
110 | * This function creates a new coroutine. Apart from a pointer to an |
90 | * uninitialized coro_context, it expects a pointer to the entry function |
111 | * uninitialised coro_context, it expects a pointer to the entry function |
91 | * and the single pointer value that is given to it as argument. |
112 | * and the single pointer value that is given to it as argument. |
92 | * |
113 | * |
93 | * Allocating/deallocating the stack is your own responsibility, so there is |
114 | * Allocating/deallocating the stack is your own responsibility, so there is |
94 | * no coro_destroy function. |
115 | * no coro_destroy function. |
95 | */ |
116 | */ |
96 | void coro_create(coro_context *ctx, |
117 | void coro_create (coro_context *ctx, |
97 | coro_func coro, void *arg, |
118 | coro_func coro, void *arg, |
98 | void *sptr, long ssize); |
119 | void *sptr, long ssize); |
99 | |
120 | |
100 | /* |
121 | /* |
101 | * The following prototype defines the coroutine switching function. It is |
122 | * The following prototype defines the coroutine switching function. It is |
102 | * usually implemented as a macro, so watch out. |
123 | * usually implemented as a macro, so watch out. |
103 | * |
124 | * |
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106 | |
127 | |
107 | /* |
128 | /* |
108 | * That was it. No other user-visible functions are implemented here. |
129 | * That was it. No other user-visible functions are implemented here. |
109 | */ |
130 | */ |
110 | |
131 | |
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132 | /*****************************************************************************/ |
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133 | |
111 | #if !defined(CORO_LOOSE) && !defined(CORO_UCONTEXT) && !defined(CORO_SJLJ) |
134 | #if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \ |
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135 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ |
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136 | && !defined(CORO_IRIX) |
112 | # if defined(WINDOWS) |
137 | # if defined(WINDOWS) |
113 | # define CORO_LOOSE 1 /* you don't win with windoze */ |
138 | # define CORO_LOSER 1 /* you don't win with windoze */ |
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139 | # elif defined(__linux) && defined(__x86) |
114 | # elif defined(HAVE_UCONTEXT_H) |
140 | # elif defined(HAVE_UCONTEXT_H) |
115 | # define CORO_UCONTEXT 1 |
141 | # define CORO_UCONTEXT 1 |
116 | # elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) |
142 | # elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) |
117 | # define CORO_SJLJ 1 |
143 | # define CORO_SJLJ 1 |
118 | # else |
144 | # else |
119 | error unknown or unsupported architecture |
145 | error unknown or unsupported architecture |
120 | # endif |
146 | # endif |
121 | #endif |
147 | #endif |
122 | |
148 | |
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149 | /*****************************************************************************/ |
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150 | |
123 | #if CORO_UCONTEXT |
151 | #if CORO_UCONTEXT |
124 | |
152 | |
125 | #include <ucontext.h> |
153 | #include <ucontext.h> |
126 | |
154 | |
127 | struct coro_context { |
155 | struct coro_context { |
128 | ucontext_t uc; |
156 | ucontext_t uc; |
129 | }; |
157 | }; |
130 | |
158 | |
131 | #define coro_transfer(p,n) swapcontext(&((p)->uc), &((n)->uc)) |
159 | #define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
132 | |
160 | |
133 | #elif CORO_SJLJ || CORO_LOOSE |
161 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
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162 | |
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163 | #if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
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164 | # define _GNU_SOURCE // for linux libc |
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165 | #endif |
134 | |
166 | |
135 | #include <setjmp.h> |
167 | #include <setjmp.h> |
136 | |
168 | |
137 | struct coro_context { |
169 | struct coro_context { |
138 | jmp_buf env; |
170 | jmp_buf env; |
139 | }; |
171 | }; |
140 | |
172 | |
141 | #define coro_transfer(p,n) if (!setjmp ((p)->env)) longjmp ((n)->env, 1) |
173 | #define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while(0) |
142 | |
174 | |
143 | #endif |
175 | #endif |
144 | |
176 | |
145 | #endif |
177 | #endif |
146 | |
178 | |