| 1 | /* |
1 | /* |
| 2 | * Copyright (c) 2001 Marc Alexander Lehmann <pcg@goof.com> |
2 | * Copyright (c) 2001-2008 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, |
| 8 | * this list of conditions and the following disclaimer. |
8 | * this list of conditions and the following disclaimer. |
| 9 | * |
9 | * |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
12 | * documentation and/or other materials provided with the distribution. |
| 13 | * |
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| 14 | * 3. The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
13 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 18 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
15 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- |
| 19 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
16 | * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO |
| 20 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
17 | * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- |
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… | |
| 23 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
20 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| 24 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
21 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- |
| 25 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
22 | * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 26 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
23 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | * |
24 | * |
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25 | * Alternatively, the contents of this file may be used under the terms of |
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26 | * the GNU General Public License ("GPL") version 2 or any later version, |
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27 | * in which case the provisions of the GPL are applicable instead of |
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28 | * the above. If you wish to allow the use of your version of this file |
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29 | * only under the terms of the GPL and not to allow others to use your |
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30 | * version of this file under the BSD license, indicate your decision |
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31 | * by deleting the provisions above and replace them with the notice |
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32 | * and other provisions required by the GPL. If you do not delete the |
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33 | * provisions above, a recipient may use your version of this file under |
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34 | * either the BSD or the GPL. |
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35 | * |
| 28 | * This library is modelled strictly after Ralf S. Engelschalls article at |
36 | * 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 |
37 | * http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must |
| 30 | * go to Ralf S. Engelschall <rse@engelschall.com>. |
38 | * go to Ralf S. Engelschall <rse@engelschall.com>. |
| 31 | * |
39 | * |
| 32 | * This coroutine library is very much stripped down. You should either |
40 | * This coroutine library is very much stripped down. You should either |
| 33 | * build your own process avstraction using it or - better - just use GNU |
41 | * build your own process abstraction using it or - better - just use GNU |
| 34 | * Portable Threads, http://www.gnu.org/software/pth/. |
42 | * Portable Threads, http://www.gnu.org/software/pth/. |
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43 | * |
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44 | */ |
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45 | |
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46 | /* |
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47 | * 2006-10-26 Include stddef.h on OS X to work around one of its bugs. |
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48 | * Reported by Michael_G_Schwern. |
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49 | * 2006-11-26 Use _setjmp instead of setjmp on GNU/Linux. |
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50 | * 2007-04-27 Set unwind frame info if gcc 3+ and ELF is detected. |
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51 | * Use _setjmp instead of setjmp on _XOPEN_SOURCE >= 600. |
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52 | * 2007-05-02 Add assembly versions for x86 and amd64 (to avoid reliance |
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53 | * on SIGUSR2 and sigaltstack in Crossfire). |
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54 | * 2008-01-21 Disable CFI usage on anything but GNU/Linux. |
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55 | * 2008-03-02 Switched to 2-clause BSD license with GPL exception. |
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56 | * 2008-04-04 New (but highly unrecommended) pthreads backend. |
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57 | * 2008-04-24 Reinstate CORO_LOSER (had wrong stack adjustments). |
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58 | * 2008-10-30 Support assembly method on x86 with and without frame pointer. |
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59 | * 2008-11-03 Use a global asm statement for CORO_ASM, idea by pippijn. |
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60 | * 2008-11-05 Hopefully fix misaligned stacks with CORO_ASM/SETJMP. |
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61 | * 2008-11-07 rbp wasn't saved in CORO_ASM on x86_64. |
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62 | * introduce coro_destroy, which is a nop except for pthreads. |
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63 | * speed up CORO_PTHREAD. Do no longer leak threads either. |
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64 | * coro_create now allows one to create source coro_contexts. |
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65 | * do not rely on makecontext passing a void * correctly. |
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66 | * try harder to get _setjmp/_longjmp. |
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67 | * major code cleanup/restructuring. |
| 35 | */ |
68 | */ |
| 36 | |
69 | |
| 37 | #ifndef CORO_H |
70 | #ifndef CORO_H |
| 38 | #define CORO_H |
71 | #define CORO_H |
| 39 | |
72 | |
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73 | #define CORO_VERSION 2 |
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74 | |
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75 | /* |
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76 | * Changes since API version 1: |
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77 | * replaced bogus -DCORO_LOOSE with gramatically more correct -DCORO_LOSER |
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78 | */ |
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79 | |
| 40 | /* |
80 | /* |
| 41 | * This library consists of only three files |
81 | * This library consists of only three files |
| 42 | * coro.h, coro.c and LICENSE |
82 | * coro.h, coro.c and LICENSE (and optionally README) |
| 43 | * |
83 | * |
| 44 | * It implements what is known as coroutines, in a hopefully |
84 | * It implements what is known as coroutines, in a hopefully |
| 45 | * portable way. At the moment you have to define which kind |
85 | * portable way. At the moment you have to define which kind |
| 46 | * of implementation flavour you want: |
86 | * of implementation flavour you want: |
| 47 | * |
87 | * |
| 48 | * -DCORO_UCONTEXT |
88 | * -DCORO_UCONTEXT |
| 49 | * |
89 | * |
| 50 | * This flavour uses SUSv2's get/set/swap/makecontext functions that |
90 | * This flavour uses SUSv2's get/set/swap/makecontext functions that |
| 51 | * unfortunately only newer unices support. |
91 | * unfortunately only newer unices support. |
| 52 | * Use this for GNU/Linux + glibc-2.2.3. |
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| 53 | * |
92 | * |
| 54 | * -DCORO_SJLJ |
93 | * -DCORO_SJLJ |
| 55 | * |
94 | * |
| 56 | * This flavour uses SUSv'2 setjmp/longjmp and sigaltstack functions to |
95 | * This flavour uses SUSv2's setjmp/longjmp and sigaltstack functions to |
| 57 | * do it's job. Coroutine creation is much slower than UCONTEXT, but |
96 | * 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 |
97 | * 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 |
98 | * all unices. |
| 60 | * do not work with any sane model (neither sigaltstack nor context |
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| 61 | * functions are implemented) |
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| 62 | * |
99 | * |
| 63 | * -DCORO_LINUX |
100 | * -DCORO_LINUX |
| 64 | * |
101 | * |
| 65 | * Old GNU/Linux systems (<= glibc-2.1) work with this implementation |
102 | * Old GNU/Linux systems (<= glibc-2.1) only work with this implementation |
| 66 | * (very fast). |
103 | * (it is very fast and therefore recommended over other methods, but |
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104 | * doesn't work with anything newer). |
| 67 | * |
105 | * |
| 68 | * -DCORO_LOOSE |
106 | * -DCORO_LOSER |
| 69 | * |
107 | * |
| 70 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
108 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
| 71 | * this automatically selects a suitable workaround for this platform. |
109 | * this automatically selects a suitable workaround for this platform. |
| 72 | * (untested) |
110 | * (untested) |
| 73 | * |
111 | * |
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112 | * -DCORO_IRIX |
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113 | * |
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114 | * SGI's version of Microsoft's NT ;) |
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115 | * |
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116 | * -DCORO_ASM |
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117 | * |
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118 | * Handcoded assembly, known to work only on a few architectures/ABI: |
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119 | * ELF Linux x86 && amd64 when gcc is used and optimisation is turned on. |
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120 | * |
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121 | * -DCORO_PTHREAD |
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122 | * |
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123 | * Use the pthread API. You have to provide <pthread.h> and -lpthread. |
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124 | * |
| 74 | * If you define neither of these symbols, coro.h will try to autodetect |
125 | * 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 |
126 | * the model. This currently works for CORO_LOSER only. For the other |
| 76 | * alternatives you should check (e.g. using autoconf) and define the |
127 | * alternatives you should check (e.g. using autoconf) and define the |
| 77 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
128 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
| 78 | */ |
129 | */ |
| 79 | |
130 | |
| 80 | /* |
131 | /* |
| 81 | * This is the type for the top function of a new coroutine. |
132 | * This is the type for the initialization function of a new coroutine. |
| 82 | */ |
133 | */ |
| 83 | typedef void (*coro_func)(void *); |
134 | typedef void (*coro_func)(void *); |
| 84 | |
135 | |
| 85 | |
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| 86 | /* |
136 | /* |
| 87 | * A coroutine state is saved in the following structure. Treat it as a |
137 | * 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, |
138 | * opaque type. errno and sigmask might be saved, but don't rely on it, |
| 89 | * implement your own switching primitive. |
139 | * implement your own switching primitive if you need that. |
| 90 | */ |
140 | */ |
| 91 | typedef struct coro_context coro_context; |
141 | typedef struct coro_context coro_context; |
| 92 | |
142 | |
| 93 | /* |
143 | /* |
| 94 | * This function creates a new coroutine. Apart from a pointer to an |
144 | * This function creates a new coroutine. Apart from a pointer to an |
| 95 | * uninitialized coro_context, it expects a pointer to the entry function |
145 | * uninitialised coro_context, it expects a pointer to the entry function |
| 96 | * and the single pointer value that is given to it as argument. |
146 | * and the single pointer value that is given to it as argument. |
| 97 | * |
147 | * |
| 98 | * Allocating/deallocating the stack is your own responsibility, so there is |
148 | * Allocating/deallocating the stack is your own responsibility. |
| 99 | * no coro_destroy function. |
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| 100 | */ |
149 | * |
| 101 | void coro_create(coro_context *ctx, |
150 | * As a special case, if coro, arg, sptr and ssize are all zero, |
| 102 | coro_func coro, void *arg, |
151 | * then an "empty" coro_contetx will be created that is suitable |
| 103 | void *sptr, long ssize); |
152 | * as an initial source for coro_transfer. |
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153 | * |
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154 | * This function is not reentrant, but putting a mutex around it |
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155 | * will work. |
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156 | */ |
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157 | void coro_create (coro_context *ctx, /* an uninitialised coro_context */ |
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158 | coro_func coro, /* the coroutine code to be executed */ |
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159 | void *arg, /* a single pointer passed to the coro */ |
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160 | void *sptr, /* start of stack area */ |
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161 | long ssize); /* size of stack area */ |
| 104 | |
162 | |
| 105 | /* |
163 | /* |
| 106 | * The following prototype defines the coroutine switching function. It is |
164 | * The following prototype defines the coroutine switching function. It is |
| 107 | * usually implemented as a macro, so watch out. |
165 | * usually implemented as a macro, so watch out. |
| 108 | * |
166 | * |
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167 | * This function is thread-safe and reentrant. |
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168 | */ |
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169 | #if 0 |
| 109 | void coro_transfer(coro_context *prev, coro_context *next); |
170 | void coro_transfer (coro_context *prev, coro_context *next); |
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171 | #endif |
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172 | |
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173 | /* |
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174 | * The following prototype defines the coroutine destroy function. It is |
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175 | * usually implemented as a macro, so watch out. It also serves |
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176 | * no purpose unless you want to use the CORO_PTHREAD backend. |
| 110 | */ |
177 | * |
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178 | * This function is thread-safe and reentrant. |
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179 | */ |
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180 | #if 0 |
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181 | void coro_destroy (coro_context *ctx); |
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182 | #endif |
| 111 | |
183 | |
| 112 | /* |
184 | /* |
| 113 | * That was it. No other user-visible functions are implemented here. |
185 | * That was it. No other user-visible functions are implemented here. |
| 114 | */ |
186 | */ |
| 115 | |
187 | |
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188 | /*****************************************************************************/ |
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189 | |
| 116 | #if !defined(CORO_LOOSE) && !defined(CORO_UCONTEXT) \ |
190 | #if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \ |
| 117 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) |
191 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ |
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192 | && !defined(CORO_IRIX) && !defined(CORO_ASM) \ |
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193 | && !defined(CORO_PTHREAD) |
| 118 | # if defined(WINDOWS) |
194 | # if defined(WINDOWS) |
| 119 | # define CORO_LOOSE 1 /* you don't win with windoze */ |
195 | # define CORO_LOSER 1 /* you don't win with windoze */ |
| 120 | # elif defined(__linux) && defined(__x86) |
196 | # elif defined(__linux) && (defined(__x86) || defined (__amd64)) |
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197 | # define CORO_ASM 1 |
| 121 | # elif defined(HAVE_UCONTEXT_H) |
198 | # elif defined(HAVE_UCONTEXT_H) |
| 122 | # define CORO_UCONTEXT 1 |
199 | # define CORO_UCONTEXT 1 |
| 123 | # elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) |
200 | # elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) |
| 124 | # define CORO_SJLJ 1 |
201 | # define CORO_SJLJ 1 |
| 125 | # else |
202 | # else |
| 126 | error unknown or unsupported architecture |
203 | error unknown or unsupported architecture |
| 127 | # endif |
204 | # endif |
| 128 | #endif |
205 | #endif |
| 129 | |
206 | |
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207 | /*****************************************************************************/ |
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208 | |
| 130 | #if CORO_UCONTEXT |
209 | #if CORO_UCONTEXT |
| 131 | |
210 | |
| 132 | #include <ucontext.h> |
211 | # include <ucontext.h> |
| 133 | |
212 | |
| 134 | struct coro_context { |
213 | struct coro_context { |
| 135 | ucontext_t uc; |
214 | ucontext_t uc; |
| 136 | }; |
215 | }; |
| 137 | |
216 | |
| 138 | #define coro_transfer(p,n) swapcontext(&((p)->uc), &((n)->uc)) |
217 | # define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) |
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218 | # define coro_destroy(ctx) (void *)(ctx) |
| 139 | |
219 | |
| 140 | #elif CORO_SJLJ || CORO_LOOSE || CORO_LINUX |
220 | #elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX |
| 141 | |
221 | |
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222 | # if defined(CORO_LINUX) && !defined(_GNU_SOURCE) |
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223 | # define _GNU_SOURCE /* for linux libc */ |
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224 | # endif |
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225 | |
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226 | # if !CORO_LOSER |
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227 | # include <unistd.h> |
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228 | # endif |
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229 | |
| 142 | #include <setjmp.h> |
230 | # include <setjmp.h> |
| 143 | |
231 | |
| 144 | struct coro_context { |
232 | struct coro_context { |
| 145 | jmp_buf env; |
233 | jmp_buf env; |
| 146 | }; |
234 | }; |
| 147 | |
235 | |
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236 | # if _XOPEN_UNIX > 0 |
| 148 | #define coro_transfer(p,n) if (!setjmp ((p)->env)) longjmp ((n)->env, 1) |
237 | # define coro_transfer(p,n) do { if (! _setjmp ((p)->env )) _longjmp ((n)->env, 1); } while (0) |
| 149 | |
238 | # elif CORO_LOSER |
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239 | # define coro_transfer(p,n) do { if (! setjmp ((p)->env )) longjmp ((n)->env, 1); } while (0) |
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240 | # else |
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241 | # define coro_transfer(p,n) do { if (!sigsetjmp ((p)->env, 0)) siglongjmp ((n)->env, 1); } while (0) |
| 150 | #endif |
242 | # endif |
| 151 | |
243 | |
| 152 | #endif |
244 | # define coro_destroy(ctx) (void *)(ctx) |
| 153 | |
245 | |
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246 | #elif CORO_ASM |
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247 | |
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248 | struct coro_context { |
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249 | void **sp; /* must be at offset 0 */ |
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250 | }; |
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251 | |
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252 | void __attribute__ ((__noinline__, __regparm__(2))) |
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253 | coro_transfer (coro_context *prev, coro_context *next); |
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254 | |
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255 | # define coro_destroy(ctx) (void *)(ctx) |
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256 | |
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257 | #elif CORO_PTHREAD |
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258 | |
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259 | # include <pthread.h> |
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260 | |
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261 | extern pthread_mutex_t coro_mutex; |
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262 | |
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263 | struct coro_context { |
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264 | pthread_cond_t cv; |
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265 | pthread_t id; |
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266 | }; |
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267 | |
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268 | void coro_transfer (coro_context *prev, coro_context *next); |
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269 | void coro_destroy (coro_context *ctx); |
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270 | |
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271 | #endif |
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272 | |
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273 | #endif |
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274 | |
