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. |
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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. |
35 | */ |
44 | */ |
36 | |
45 | |
37 | #ifndef CORO_H |
46 | #ifndef CORO_H |
38 | #define CORO_H |
47 | #define CORO_H |
39 | |
48 | |
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49 | #define CORO_VERSION 2 |
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50 | |
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51 | /* |
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52 | * Changes since API version 1: |
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53 | * replaced bogus -DCORO_LOOSE with gramatically more correct -DCORO_LOSER |
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54 | */ |
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55 | |
40 | /* |
56 | /* |
41 | * This library consists of only three files |
57 | * This library consists of only three files |
42 | * coro.h, coro.c and LICENSE |
58 | * coro.h, coro.c and LICENSE (and optionally README) |
43 | * |
59 | * |
44 | * It implements what is known as coroutines, in a hopefully |
60 | * It implements what is known as coroutines, in a hopefully |
45 | * portable way. At the moment you have to define which kind |
61 | * portable way. At the moment you have to define which kind |
46 | * of implementation flavour you want: |
62 | * of implementation flavour you want: |
47 | * |
63 | * |
48 | * -DCORO_UCONTEXT |
64 | * -DCORO_UCONTEXT |
49 | * |
65 | * |
50 | * This flavour uses SUSv2's get/set/swap/makecontext functions that |
66 | * This flavour uses SUSv2's get/set/swap/makecontext functions that |
51 | * unfortunately only newer unices support. |
67 | * unfortunately only newer unices support. |
52 | * Use this for GNU/Linux + glibc-2.2.3. |
68 | * Use this for GNU/Linux + glibc-2.2.3 and possibly higher. |
53 | * |
69 | * |
54 | * -DCORO_SJLJ |
70 | * -DCORO_SJLJ |
55 | * |
71 | * |
56 | * This flavour uses SUSv'2 setjmp/longjmp and sigaltstack functions to |
72 | * This flavour uses SUSv2's setjmp/longjmp and sigaltstack functions to |
57 | * do it's job. Coroutine creation is much slower than UCONTEXT, but |
73 | * 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 |
74 | * 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 |
75 | * all unices. Use this for GNU/Linux + glibc-2.2. glibc-2.1 and below |
60 | * do not work with any sane model (neither sigaltstack nor context |
76 | * do not work with any sane model (neither sigaltstack nor context |
61 | * functions are implemented) |
77 | * functions are implemented) |
62 | * |
78 | * |
63 | * -DCORO_LINUX |
79 | * -DCORO_LINUX |
64 | * |
80 | * |
65 | * Old GNU/Linux systems (<= glibc-2.1) work with this implementation |
81 | * Old GNU/Linux systems (<= glibc-2.1) work with this implementation |
66 | * (very fast). |
82 | * (it is very fast and therefore recommended over other methods). |
67 | * |
83 | * |
68 | * -DCORO_LOOSE |
84 | * -DCORO_LOSER |
69 | * |
85 | * |
70 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
86 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
71 | * this automatically selects a suitable workaround for this platform. |
87 | * this automatically selects a suitable workaround for this platform. |
72 | * (untested) |
88 | * (untested) |
73 | * |
89 | * |
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90 | * -DCORO_IRIX |
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91 | * |
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92 | * SGI's version of Microsoft's NT ;) |
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93 | * |
74 | * If you define neither of these symbols, coro.h will try to autodetect |
94 | * If you define neither of these symbols, coro.h will try to autodetect |
75 | * the model. This currently works for CORO_LOOSE only. For the other |
95 | * the model. This currently works for CORO_LOSER only. For the other |
76 | * alternatives you should check (e.g. using autoconf) and define the |
96 | * alternatives you should check (e.g. using autoconf) and define the |
77 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
97 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
78 | */ |
98 | */ |
79 | |
99 | |
80 | /* |
100 | /* |
81 | * This is the type for the top function of a new coroutine. |
101 | * This is the type for the initialization function of a new coroutine. |
82 | */ |
102 | */ |
83 | typedef void (*coro_func)(void *); |
103 | typedef void (*coro_func)(void *); |
84 | |
104 | |
85 | |
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86 | /* |
105 | /* |
87 | * A coroutine state is saved in the following structure. Treat it as a |
106 | * A coroutine state is saved in the following structure. Treat it as an |
88 | * opaque type. errno and sigmask might be saved, but don't rely on it, |
107 | * opaque type. errno and sigmask might be saved, but don't rely on it, |
89 | * implement your own switching primitive. |
108 | * implement your own switching primitive if you need that. |
90 | */ |
109 | */ |
91 | typedef struct coro_context coro_context; |
110 | typedef struct coro_context coro_context; |
92 | |
111 | |
93 | /* |
112 | /* |
94 | * This function creates a new coroutine. Apart from a pointer to an |
113 | * This function creates a new coroutine. Apart from a pointer to an |
95 | * uninitialized coro_context, it expects a pointer to the entry function |
114 | * uninitialised coro_context, it expects a pointer to the entry function |
96 | * and the single pointer value that is given to it as argument. |
115 | * and the single pointer value that is given to it as argument. |
97 | * |
116 | * |
98 | * Allocating/deallocating the stack is your own responsibility, so there is |
117 | * Allocating/deallocating the stack is your own responsibility, so there is |
99 | * no coro_destroy function. |
118 | * no coro_destroy function. |
100 | */ |
119 | */ |
101 | void coro_create(coro_context *ctx, |
120 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
102 | coro_func coro, void *arg, |
121 | coro_func coro, /* the coroutine code to be executed */ |
103 | void *sptr, long ssize); |
122 | void *arg, /* a single pointer passed to the coro */ |
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123 | void *sptr, /* start of stack area */ |
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124 | long ssize); /* size of stack area */ |
104 | |
125 | |
105 | /* |
126 | /* |
106 | * The following prototype defines the coroutine switching function. It is |
127 | * The following prototype defines the coroutine switching function. It is |
107 | * usually implemented as a macro, so watch out. |
128 | * usually implemented as a macro, so watch out. |
108 | * |
129 | * |
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111 | |
132 | |
112 | /* |
133 | /* |
113 | * That was it. No other user-visible functions are implemented here. |
134 | * That was it. No other user-visible functions are implemented here. |
114 | */ |
135 | */ |
115 | |
136 | |
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137 | /*****************************************************************************/ |
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138 | |
116 | #if !defined(CORO_LOOSE) && !defined(CORO_UCONTEXT) \ |
139 | #if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \ |
117 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) |
140 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ |
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141 | && !defined(CORO_IRIX) |
118 | # if defined(WINDOWS) |
142 | # if defined(WINDOWS) |
119 | # define CORO_LOOSE 1 /* you don't win with windoze */ |
143 | # define CORO_LOSER 1 /* you don't win with windoze */ |
120 | # elif defined(__linux) && defined(__x86) |
144 | # elif defined(__linux) && defined(__x86) |
121 | # elif defined(HAVE_UCONTEXT_H) |
145 | # elif defined(HAVE_UCONTEXT_H) |
122 | # define CORO_UCONTEXT 1 |
146 | # define CORO_UCONTEXT 1 |
123 | # elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) |
147 | # elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) |
124 | # define CORO_SJLJ 1 |
148 | # define CORO_SJLJ 1 |
125 | # else |
149 | # else |
126 | error unknown or unsupported architecture |
150 | error unknown or unsupported architecture |
127 | # endif |
151 | # endif |
128 | #endif |
152 | #endif |
129 | |
153 | |
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154 | /*****************************************************************************/ |
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155 | |
130 | #if CORO_UCONTEXT |
156 | #if CORO_UCONTEXT |
131 | |
157 | |
132 | #include <ucontext.h> |
158 | #include <ucontext.h> |
133 | |
159 | |
134 | struct coro_context { |
160 | struct coro_context { |
135 | ucontext_t uc; |
161 | ucontext_t uc; |
136 | }; |
162 | }; |
137 | |
163 | |
138 | #define coro_transfer(p,n) swapcontext(&((p)->uc), &((n)->uc)) |
164 | #define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
139 | |
165 | |
140 | #elif CORO_SJLJ || CORO_LOOSE || CORO_LINUX |
166 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
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167 | |
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168 | #if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
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169 | # define _GNU_SOURCE /* for linux libc */ |
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170 | #endif |
141 | |
171 | |
142 | #include <setjmp.h> |
172 | #include <setjmp.h> |
143 | |
173 | |
144 | struct coro_context { |
174 | struct coro_context { |
145 | jmp_buf env; |
175 | jmp_buf env; |
146 | }; |
176 | }; |
147 | |
177 | |
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178 | #if CORO_LINUX || (_XOPEN_SOURCE >= 600) |
148 | #define coro_transfer(p,n) if (!setjmp ((p)->env)) longjmp ((n)->env, 1) |
179 | # define coro_transfer(p,n) do { if (!_setjmp ((p)->env)) _longjmp ((n)->env, 1); } while (0) |
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180 | #else |
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181 | # define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0) |
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182 | #endif |
149 | |
183 | |
150 | #endif |
184 | #endif |
151 | |
185 | |
152 | #endif |
186 | #endif |
153 | |
187 | |