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Comparing libcoro/coro.h (file contents):
Revision 1.22 by root, Wed May 2 05:53:26 2007 UTC vs.
Revision 1.40 by root, Wed Nov 19 02:56:16 2008 UTC

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 *
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
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-
… …
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 *
25 * Alternatively, the contents of this file may be used under the terms of
26 * the GNU General Public License ("GPL") version 2 or any later version,
27 * in which case the provisions of the GPL are applicable instead of
28 * the above. If you wish to allow the use of your version of this file
29 * only under the terms of the GPL and not to allow others to use your
30 * version of this file under the BSD license, indicate your decision
31 * by deleting the provisions above and replace them with the notice
32 * and other provisions required by the GPL. If you do not delete the
33 * provisions above, a recipient may use your version of this file under
34 * either the BSD or the GPL.
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/.
… …
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).
54 * 2008-01-21 Disable CFI usage on anything but GNU/Linux.
55 * 2008-03-02 Switched to 2-clause BSD license with GPL exception.
56 * 2008-04-04 New (but highly unrecommended) pthreads backend.
57 * 2008-04-24 Reinstate CORO_LOSER (had wrong stack adjustments).
58 * 2008-10-30 Support assembly method on x86 with and without frame pointer.
59 * 2008-11-03 Use a global asm statement for CORO_ASM, idea by pippijn.
60 * 2008-11-05 Hopefully fix misaligned stacks with CORO_ASM/SETJMP.
61 * 2008-11-07 rbp wasn't saved in CORO_ASM on x86_64.
62 * introduce coro_destroy, which is a nop except for pthreads.
63 * speed up CORO_PTHREAD. Do no longer leak threads either.
64 * coro_create now allows one to create source coro_contexts.
65 * do not rely on makecontext passing a void * correctly.
66 * try harder to get _setjmp/_longjmp.
67 * major code cleanup/restructuring.
68 * 2008-11-10 the .cfi hacks are no longer needed.
69 * 2008-11-16 work around a freebsd pthread bug.
70 * 2008-11-19 define coro_*jmp symbols for easier porting.
46 */ 71 */
47 72
48#ifndef CORO_H 73#ifndef CORO_H
49#define CORO_H 74#define CORO_H
50 75
… …
65 * 90 *
66 * -DCORO_UCONTEXT 91 * -DCORO_UCONTEXT
67 * 92 *
68 * This flavour uses SUSv2's get/set/swap/makecontext functions that 93 * This flavour uses SUSv2's get/set/swap/makecontext functions that
69 * unfortunately only newer unices support. 94 * unfortunately only newer unices support.
70 * Use this for GNU/Linux + glibc-2.2.3 and possibly higher.
71 * 95 *
72 * -DCORO_SJLJ 96 * -DCORO_SJLJ
73 * 97 *
74 * This flavour uses SUSv2's setjmp/longjmp and sigaltstack functions to 98 * This flavour uses SUSv2's setjmp/longjmp and sigaltstack functions to
75 * do it's job. Coroutine creation is much slower than UCONTEXT, but 99 * 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 100 * 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 101 * all unices.
78 * do not work with any sane model (neither sigaltstack nor context
79 * functions are implemented)
80 * 102 *
81 * -DCORO_LINUX 103 * -DCORO_LINUX
82 * 104 *
83 * Old GNU/Linux systems (<= glibc-2.1) work with this implementation 105 * Old GNU/Linux systems (<= glibc-2.1) only work with this implementation
84 * (it is very fast and therefore recommended over other methods). 106 * (it is very fast and therefore recommended over other methods, but
107 * doesn't work with anything newer).
85 * 108 *
86 * -DCORO_LOSER 109 * -DCORO_LOSER
87 * 110 *
88 * Microsoft's highly proprietary platform doesn't support sigaltstack, and 111 * Microsoft's highly proprietary platform doesn't support sigaltstack, and
89 * this automatically selects a suitable workaround for this platform. 112 * this automatically selects a suitable workaround for this platform.
… …
94 * SGI's version of Microsoft's NT ;) 117 * SGI's version of Microsoft's NT ;)
95 * 118 *
96 * -DCORO_ASM 119 * -DCORO_ASM
97 * 120 *
98 * Handcoded assembly, known to work only on a few architectures/ABI: 121 * 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. 122 * GCC + x86/IA32 and amd64/x86_64 + GNU/Linux and a few BSDs.
123 *
124 * -DCORO_PTHREAD
125 *
126 * Use the pthread API. You have to provide <pthread.h> and -lpthread.
127 * This is likely the slowest backend, and it also does not support fork(),
128 * so avoid it at all costs.
100 * 129 *
101 * If you define neither of these symbols, coro.h will try to autodetect 130 * 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 131 * the model. This currently works for CORO_LOSER only. For the other
103 * alternatives you should check (e.g. using autoconf) and define the 132 * alternatives you should check (e.g. using autoconf) and define the
104 * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK. 133 * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK.
105 */ 134 */
106 135
107/* 136/*
… …
119/* 148/*
120 * This function creates a new coroutine. Apart from a pointer to an 149 * This function creates a new coroutine. Apart from a pointer to an
121 * uninitialised coro_context, it expects a pointer to the entry function 150 * uninitialised coro_context, it expects a pointer to the entry function
122 * and the single pointer value that is given to it as argument. 151 * and the single pointer value that is given to it as argument.
123 * 152 *
124 * Allocating/deallocating the stack is your own responsibility, so there is 153 * Allocating/deallocating the stack is your own responsibility.
125 * no coro_destroy function. 154 *
155 * As a special case, if coro, arg, sptr and ssize are all zero,
156 * then an "empty" coro_context will be created that is suitable
157 * as an initial source for coro_transfer.
158 *
159 * This function is not reentrant, but putting a mutex around it
160 * will work.
126 */ 161 */
127void coro_create (coro_context *ctx, /* an uninitialised coro_context */ 162void coro_create (coro_context *ctx, /* an uninitialised coro_context */
128 coro_func coro, /* the coroutine code to be executed */ 163 coro_func coro, /* the coroutine code to be executed */
129 void *arg, /* a single pointer passed to the coro */ 164 void *arg, /* a single pointer passed to the coro */
130 void *sptr, /* start of stack area */ 165 void *sptr, /* start of stack area */
… …
132 167
133/* 168/*
134 * The following prototype defines the coroutine switching function. It is 169 * The following prototype defines the coroutine switching function. It is
135 * usually implemented as a macro, so watch out. 170 * usually implemented as a macro, so watch out.
136 * 171 *
172 * This function is thread-safe and reentrant.
173 */
174#if 0
137void coro_transfer(coro_context *prev, coro_context *next); 175void coro_transfer (coro_context *prev, coro_context *next);
176#endif
177
178/*
179 * The following prototype defines the coroutine destroy function. It is
180 * usually implemented as a macro, so watch out. It also serves
181 * no purpose unless you want to use the CORO_PTHREAD backend,
182 * where it is used to clean up the thread. You are responsible
183 * for freeing the stack and the context itself.
138 */ 184 *
185 * This function is thread-safe and reentrant.
186 */
187#if 0
188void coro_destroy (coro_context *ctx);
189#endif
139 190
140/* 191/*
141 * That was it. No other user-visible functions are implemented here. 192 * That was it. No other user-visible functions are implemented here.
142 */ 193 */
143 194
144/*****************************************************************************/ 195/*****************************************************************************/
145 196
146#if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \ 197#if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \
147 && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \ 198 && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \
148 && !defined(CORO_IRIX) && !defined(CORO_ASM) 199 && !defined(CORO_IRIX) && !defined(CORO_ASM) \
200 && !defined(CORO_PTHREAD)
149# if defined(WINDOWS) 201# if defined(WINDOWS)
150# define CORO_LOSER 1 /* you don't win with windoze */ 202# define CORO_LOSER 1 /* you don't win with windoze */
151# elif defined(__linux) && (defined(__x86) || defined (__amd64)) 203# elif defined(__linux) && (defined(__x86) || defined (__amd64))
152# define CORO_ASM 1 204# define CORO_ASM 1
153# elif defined(HAVE_UCONTEXT_H) 205# elif defined(HAVE_UCONTEXT_H)
… …
168struct coro_context { 220struct coro_context {
169 ucontext_t uc; 221 ucontext_t uc;
170}; 222};
171 223
172# define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc)) 224# define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc))
225# define coro_destroy(ctx) (void *)(ctx)
173 226
174#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX 227#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX
175 228
176# if defined(CORO_LINUX) && !defined(_GNU_SOURCE) 229# if defined(CORO_LINUX) && !defined(_GNU_SOURCE)
177# define _GNU_SOURCE /* for linux libc */ 230# define _GNU_SOURCE /* for linux libc */
178# endif 231# endif
179 232
233# if !CORO_LOSER
234# include <unistd.h>
235# endif
236
237/* solaris is hopelessly borked, it expands _XOPEN_UNIX to nothing */
238# if __sun
239# undef _XOPEN_UNIX
240# define _XOPEN_UNIX 1
241# endif
242
180# include <setjmp.h> 243# include <setjmp.h>
181 244
182struct coro_context { 245# if _XOPEN_UNIX > 0 || defined (_setjmp)
183 jmp_buf env; 246# define coro_jmp_buf jmp_buf
184}; 247# define coro_setjmp(env) _setjmp (env)
185 248# define coro_longjmp(env) _longjmp ((env), 1)
186# if CORO_LINUX || (_XOPEN_SOURCE >= 600) 249# elif CORO_LOSER
187# define coro_transfer(p,n) do { if (!_setjmp ((p)->env)) _longjmp ((n)->env, 1); } while (0) 250# define coro_jmp_buf jmp_buf
251# define coro_setjmp(env) setjmp (env)
252# define coro_longjmp(env) longjmp ((env), 1)
188# else 253# else
254# define coro_jmp_buf sigjmp_buf
255# define coro_setjmp(env) sigsetjmp (env, 0)
256# define coro_longjmp(env) siglongjmp ((env), 1)
257# endif
258
259struct coro_context {
260 coro_jmp_buf env;
261};
262
189# define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0) 263# define coro_transfer(p,n) do { if (!coro_setjmp ((p)->env)) coro_longjmp ((n)->env); } while (0)
190# endif 264# define coro_destroy(ctx) (void *)(ctx)
191 265
192#elif CORO_ASM 266#elif CORO_ASM
193 267
194struct coro_context { 268struct coro_context {
195 volatile void **sp; 269 void **sp; /* must be at offset 0 */
196}; 270};
197 271
198void __attribute__ ((__noinline__, __fastcall__)) 272void __attribute__ ((__noinline__, __regparm__(2)))
199 coro_transfer(coro_context *prev, coro_context *next); 273coro_transfer (coro_context *prev, coro_context *next);
200 274
201#endif 275# define coro_destroy(ctx) (void *)(ctx)
202 276
203#endif 277#elif CORO_PTHREAD
204 278
279# include <pthread.h>
280
281extern pthread_mutex_t coro_mutex;
282
283struct coro_context {
284 pthread_cond_t cv;
285 pthread_t id;
286};
287
288void coro_transfer (coro_context *prev, coro_context *next);
289void coro_destroy (coro_context *ctx);
290
291#endif
292
293#endif
294

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