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Comparing libcoro/coro.h (file contents):
Revision 1.1 by root, Mon Jul 23 17:13:08 2001 UTC vs.
Revision 1.16 by root, Sat Nov 25 00:27:00 2006 UTC

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,
… …
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/.
35 *
36 */
37
38/*
39 * 2006-10-26 Include stddef.h on OS X to work around one of its bugs.
40 * Reported by Michael_G_Schwern.
41 * 2006-11-25 Use _setjmp instead of setjmp on GNU/Linux.
35 */ 42 */
36 43
37#ifndef CORO_H 44#ifndef CORO_H
38#define CORO_H 45#define CORO_H
39 46
47#define CORO_VERSION 2
48
49/*
50 * Changes since API version 1:
51 * replaced bogus -DCORO_LOOSE with gramatically more correct -DCORO_LOSER
52 */
53
54/*
55 * This library consists of only three files
56 * coro.h, coro.c and LICENSE (and optionally README)
57 *
58 * It implements what is known as coroutines, in a hopefully
59 * portable way. At the moment you have to define which kind
60 * of implementation flavour you want:
61 *
62 * -DCORO_UCONTEXT
63 *
64 * This flavour uses SUSv2's get/set/swap/makecontext functions that
65 * unfortunately only newer unices support.
66 * Use this for GNU/Linux + glibc-2.2.3 and possibly higher.
67 *
68 * -DCORO_SJLJ
69 *
70 * This flavour uses SUSv2's setjmp/longjmp and sigaltstack functions to
71 * do it's job. Coroutine creation is much slower than UCONTEXT, but
72 * context switching is often a bit cheaper. It should work on almost
73 * all unices. Use this for GNU/Linux + glibc-2.2. glibc-2.1 and below
74 * do not work with any sane model (neither sigaltstack nor context
75 * functions are implemented)
76 *
77 * -DCORO_LINUX
78 *
79 * Old GNU/Linux systems (<= glibc-2.1) work with this implementation
80 * (it is very fast and therefore recommended over other methods).
81 *
82 * -DCORO_LOSER
83 *
84 * Microsoft's highly proprietary platform doesn't support sigaltstack, and
85 * this automatically selects a suitable workaround for this platform.
86 * (untested)
87 *
88 * -DCORO_IRIX
89 *
90 * SGI's version of Microsoft's NT ;)
91 *
92 * If you define neither of these symbols, coro.h will try to autodetect
93 * the model. This currently works for CORO_LOSER only. For the other
94 * alternatives you should check (e.g. using autoconf) and define the
95 * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK.
96 */
97
98/*
99 * This is the type for the initialization function of a new coroutine.
100 */
40typedef void (*coro_func)(void *); 101typedef void (*coro_func)(void *);
41 102
103/*
104 * A coroutine state is saved in the following structure. Treat it as a
105 * opaque type. errno and sigmask might be saved, but don't rely on it,
106 * implement your own switching primitive if you need it.
107 */
108typedef struct coro_context coro_context;
109
110/*
111 * This function creates a new coroutine. Apart from a pointer to an
112 * uninitialised coro_context, it expects a pointer to the entry function
113 * and the single pointer value that is given to it as argument.
114 *
115 * Allocating/deallocating the stack is your own responsibility, so there is
116 * no coro_destroy function.
117 */
118void coro_create (coro_context *ctx,
119 coro_func coro, void *arg,
120 void *sptr, long ssize);
121
122/*
123 * The following prototype defines the coroutine switching function. It is
124 * usually implemented as a macro, so watch out.
125 *
126void coro_transfer(coro_context *prev, coro_context *next);
127 */
128
129/*
130 * That was it. No other user-visible functions are implemented here.
131 */
132
133/*****************************************************************************/
134
135#if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \
136 && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \
137 && !defined(CORO_IRIX)
42#if defined(WINDOWS) 138# if defined(WINDOWS)
43# define CORO_LOOSE 1 /* you don't win with windoze */ 139# define CORO_LOSER 1 /* you don't win with windoze */
140# elif defined(__linux) && defined(__x86)
44#elif defined(HAVE_UCONTEXT_H) 141# elif defined(HAVE_UCONTEXT_H)
45# define CORO_UCONTEXT 1 142# define CORO_UCONTEXT 1
46#elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) 143# elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK)
47# define CORO_SJLJ 1 144# define CORO_SJLJ 1
48#else 145# else
49error unknown or unsupported architecture 146error unknown or unsupported architecture
147# endif
50#endif 148#endif
149
150/*****************************************************************************/
51 151
52#if CORO_UCONTEXT 152#if CORO_UCONTEXT
53 153
54#include <ucontext.h> 154#include <ucontext.h>
55 155
56typedef struct { 156struct coro_context {
57 ucontext_t uc; 157 ucontext_t uc;
58} coro_context; 158};
59 159
60#define coro_transfer(p,n) swapcontext(&((p)->uc), &((n)->uc)) 160#define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc))
61 161
62#elif CORO_SJLJ || CORO_LOOSE 162#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX
163
164#if defined(CORO_LINUX) && !defined(_GNU_SOURCE)
165# define _GNU_SOURCE // for linux libc
166#endif
63 167
64#include <setjmp.h> 168#include <setjmp.h>
65 169
66typedef struct { 170struct coro_context {
67 jmp_buf env; 171 jmp_buf env;
68} coro_context; 172};
69 173
70#define coro_transfer(p,n) if (!setjmp ((p)->env)) longjmp ((n)->env, 1) 174#define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while(0)
71 175
72#endif 176#endif
73 177
74void coro_create(coro_context *ctx,
75 coro_func coro, void *arg,
76 void *sptr, long ssize);
77
78#endif 178#endif
79 179

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