1 | /* |
1 | /* |
2 | * Copyright (c) 2001-2006 Marc Alexander Lehmann <schmorp@schmorp.de> |
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 abstraction 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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41 | * 2006-11-26 Use _setjmp instead of setjmp on GNU/Linux. |
49 | * 2006-11-26 Use _setjmp instead of setjmp on GNU/Linux. |
42 | * 2007-04-27 Set unwind frame info if gcc 3+ and ELF is detected. |
50 | * 2007-04-27 Set unwind frame info if gcc 3+ and ELF is detected. |
43 | * Use _setjmp instead of setjmp on _XOPEN_SOURCE >= 600. |
51 | * Use _setjmp instead of setjmp on _XOPEN_SOURCE >= 600. |
44 | * 2007-05-02 Add assembly versions for x86 and amd64 (to avoid reliance |
52 | * 2007-05-02 Add assembly versions for x86 and amd64 (to avoid reliance |
45 | * on SIGUSR2 and sigaltstack in Crossfire). |
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. |
46 | */ |
59 | */ |
47 | |
60 | |
48 | #ifndef CORO_H |
61 | #ifndef CORO_H |
49 | #define CORO_H |
62 | #define CORO_H |
50 | |
63 | |
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65 | * |
78 | * |
66 | * -DCORO_UCONTEXT |
79 | * -DCORO_UCONTEXT |
67 | * |
80 | * |
68 | * This flavour uses SUSv2's get/set/swap/makecontext functions that |
81 | * This flavour uses SUSv2's get/set/swap/makecontext functions that |
69 | * unfortunately only newer unices support. |
82 | * unfortunately only newer unices support. |
70 | * Use this for GNU/Linux + glibc-2.2.3 and possibly higher. |
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71 | * |
83 | * |
72 | * -DCORO_SJLJ |
84 | * -DCORO_SJLJ |
73 | * |
85 | * |
74 | * This flavour uses SUSv2's setjmp/longjmp and sigaltstack functions to |
86 | * This flavour uses SUSv2's setjmp/longjmp and sigaltstack functions to |
75 | * do it's job. Coroutine creation is much slower than UCONTEXT, but |
87 | * do it's job. Coroutine creation is much slower than UCONTEXT, but |
76 | * context switching is often a bit cheaper. It should work on almost |
88 | * context switching is often a bit cheaper. It should work on almost |
77 | * all unices. Use this for GNU/Linux + glibc-2.2. glibc-2.1 and below |
89 | * all unices. |
78 | * do not work with any sane model (neither sigaltstack nor context |
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79 | * functions are implemented) |
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80 | * |
90 | * |
81 | * -DCORO_LINUX |
91 | * -DCORO_LINUX |
82 | * |
92 | * |
83 | * Old GNU/Linux systems (<= glibc-2.1) work with this implementation |
93 | * Old GNU/Linux systems (<= glibc-2.1) only work with this implementation |
84 | * (it is very fast and therefore recommended over other methods). |
94 | * (it is very fast and therefore recommended over other methods, but |
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95 | * doesn't work with anything newer). |
85 | * |
96 | * |
86 | * -DCORO_LOSER |
97 | * -DCORO_LOSER |
87 | * |
98 | * |
88 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
99 | * Microsoft's highly proprietary platform doesn't support sigaltstack, and |
89 | * this automatically selects a suitable workaround for this platform. |
100 | * this automatically selects a suitable workaround for this platform. |
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96 | * -DCORO_ASM |
107 | * -DCORO_ASM |
97 | * |
108 | * |
98 | * Handcoded assembly, known to work only on a few architectures/ABI: |
109 | * Handcoded assembly, known to work only on a few architectures/ABI: |
99 | * ELF Linux x86 && amd64 when gcc is used and optimisation is turned on. |
110 | * ELF Linux x86 && amd64 when gcc is used and optimisation is turned on. |
100 | * |
111 | * |
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112 | * -DCORO_PTHREAD |
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113 | * |
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114 | * Use the pthread API. You have to provide <pthread.h> and -lpthread. |
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115 | * |
101 | * If you define neither of these symbols, coro.h will try to autodetect |
116 | * If you define neither of these symbols, coro.h will try to autodetect |
102 | * the model. This currently works for CORO_LOSER only. For the other |
117 | * the model. This currently works for CORO_LOSER only. For the other |
103 | * alternatives you should check (e.g. using autoconf) and define the |
118 | * alternatives you should check (e.g. using autoconf) and define the |
104 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
119 | * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. |
105 | */ |
120 | */ |
106 | |
121 | |
107 | /* |
122 | /* |
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143 | |
158 | |
144 | /*****************************************************************************/ |
159 | /*****************************************************************************/ |
145 | |
160 | |
146 | #if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \ |
161 | #if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \ |
147 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ |
162 | && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ |
148 | && !defined(CORO_IRIX) && !defined(CORO_ASM) |
163 | && !defined(CORO_IRIX) && !defined(CORO_ASM) \ |
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164 | && !defined(CORO_PTHREAD) |
149 | # if defined(WINDOWS) |
165 | # if defined(WINDOWS) |
150 | # define CORO_LOSER 1 /* you don't win with windoze */ |
166 | # define CORO_LOSER 1 /* you don't win with windoze */ |
151 | # elif defined(__linux) && (defined(__x86) || defined (__amd64)) |
167 | # elif defined(__linux) && (defined(__x86) || defined (__amd64)) |
152 | # define CORO_ASM 1 |
168 | # define CORO_ASM 1 |
153 | # elif defined(HAVE_UCONTEXT_H) |
169 | # elif defined(HAVE_UCONTEXT_H) |
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193 | |
209 | |
194 | struct coro_context { |
210 | struct coro_context { |
195 | volatile void **sp; |
211 | volatile void **sp; |
196 | }; |
212 | }; |
197 | |
213 | |
198 | void __attribute__ ((__noinline__, __fastcall__)) |
214 | void __attribute__ ((__noinline__, __regparm__(2))) |
199 | coro_transfer(coro_context *prev, coro_context *next); |
215 | coro_transfer (coro_context *prev, coro_context *next); |
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216 | |
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217 | #elif CORO_PTHREAD |
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218 | |
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219 | #include <pthread.h> |
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220 | |
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221 | extern pthread_mutex_t coro_mutex; |
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222 | |
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223 | struct coro_context { |
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224 | pthread_cond_t c; |
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225 | }; |
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226 | |
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227 | void coro_transfer (coro_context *prev, coro_context *next); |
200 | |
228 | |
201 | #endif |
229 | #endif |
202 | |
230 | |
203 | #endif |
231 | #endif |
204 | |
232 | |