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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 1.21 by root, Fri Apr 27 19:35:28 2007 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 * 2006-11-26 Use _setjmp instead of setjmp on GNU/Linux.
42 * 2007-04-27 Set unwind frame info if gcc 3+ and ELF is detected.
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
49#define CORO_VERSION 2
50
51/*
52 * Changes since API version 1:
53 * replaced bogus -DCORO_LOOSE with gramatically more correct -DCORO_LOSER
54 */
55
56/*
57 * This library consists of only three files
58 * coro.h, coro.c and LICENSE (and optionally README)
59 *
60 * It implements what is known as coroutines, in a hopefully
61 * portable way. At the moment you have to define which kind
62 * of implementation flavour you want:
63 *
64 * -DCORO_UCONTEXT
65 *
66 * This flavour uses SUSv2's get/set/swap/makecontext functions that
67 * unfortunately only newer unices support.
68 * Use this for GNU/Linux + glibc-2.2.3 and possibly higher.
69 *
70 * -DCORO_SJLJ
71 *
72 * This flavour uses SUSv2's setjmp/longjmp and sigaltstack functions to
73 * do it's job. Coroutine creation is much slower than UCONTEXT, but
74 * context switching is often a bit cheaper. It should work on almost
75 * all unices. Use this for GNU/Linux + glibc-2.2. glibc-2.1 and below
76 * do not work with any sane model (neither sigaltstack nor context
77 * functions are implemented)
78 *
79 * -DCORO_LINUX
80 *
81 * Old GNU/Linux systems (<= glibc-2.1) work with this implementation
82 * (it is very fast and therefore recommended over other methods).
83 *
84 * -DCORO_LOSER
85 *
86 * Microsoft's highly proprietary platform doesn't support sigaltstack, and
87 * this automatically selects a suitable workaround for this platform.
88 * (untested)
89 *
90 * -DCORO_IRIX
91 *
92 * SGI's version of Microsoft's NT ;)
93 *
94 * If you define neither of these symbols, coro.h will try to autodetect
95 * the model. This currently works for CORO_LOSER only. For the other
96 * alternatives you should check (e.g. using autoconf) and define the
97 * following symbols: HAVE_UCONTEXT_H / HAVE_SETJMP_H / HAVE_SIGALTSTACK.
98 */
99
100/*
101 * This is the type for the initialization function of a new coroutine.
102 */
40typedef void (*coro_func)(void *); 103typedef void (*coro_func)(void *);
41 104
105/*
106 * A coroutine state is saved in the following structure. Treat it as an
107 * opaque type. errno and sigmask might be saved, but don't rely on it,
108 * implement your own switching primitive if you need that.
109 */
110typedef struct coro_context coro_context;
111
112/*
113 * This function creates a new coroutine. Apart from a pointer to an
114 * uninitialised coro_context, it expects a pointer to the entry function
115 * and the single pointer value that is given to it as argument.
116 *
117 * Allocating/deallocating the stack is your own responsibility, so there is
118 * no coro_destroy function.
119 */
120void coro_create (coro_context *ctx, /* an uninitialised coro_context */
121 coro_func coro, /* the coroutine code to be executed */
122 void *arg, /* a single pointer passed to the coro */
123 void *sptr, /* start of stack area */
124 long ssize); /* size of stack area */
125
126/*
127 * The following prototype defines the coroutine switching function. It is
128 * usually implemented as a macro, so watch out.
129 *
130void coro_transfer(coro_context *prev, coro_context *next);
131 */
132
133/*
134 * That was it. No other user-visible functions are implemented here.
135 */
136
137/*****************************************************************************/
138
139#if !defined(CORO_LOSER) && !defined(CORO_UCONTEXT) \
140 && !defined(CORO_SJLJ) && !defined(CORO_LINUX) \
141 && !defined(CORO_IRIX)
42#if defined(WINDOWS) 142# if defined(WINDOWS)
43# define CORO_LOOSE 1 /* you don't win with windoze */ 143# define CORO_LOSER 1 /* you don't win with windoze */
144# elif defined(__linux) && defined(__x86)
44#elif defined(HAVE_UCONTEXT_H) 145# elif defined(HAVE_UCONTEXT_H)
45# define CORO_UCONTEXT 1 146# define CORO_UCONTEXT 1
46#elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) 147# elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK)
47# define CORO_SJLJ 1 148# define CORO_SJLJ 1
48#else 149# else
49error unknown or unsupported architecture 150error unknown or unsupported architecture
151# endif
50#endif 152#endif
153
154/*****************************************************************************/
51 155
52#if CORO_UCONTEXT 156#if CORO_UCONTEXT
53 157
54#include <ucontext.h> 158#include <ucontext.h>
55 159
56typedef struct { 160struct coro_context {
57 ucontext_t uc; 161 ucontext_t uc;
58} coro_context; 162};
59 163
60#define coro_transfer(p,n) swapcontext(&((p)->uc), &((n)->uc)) 164#define coro_transfer(p,n) swapcontext (&((p)->uc), &((n)->uc))
61 165
62#elif CORO_SJLJ || CORO_LOOSE 166#elif CORO_SJLJ || CORO_LOSER || CORO_LINUX || CORO_IRIX
167
168#if defined(CORO_LINUX) && !defined(_GNU_SOURCE)
169# define _GNU_SOURCE /* for linux libc */
170#endif
63 171
64#include <setjmp.h> 172#include <setjmp.h>
65 173
66typedef struct { 174struct coro_context {
67 jmp_buf env; 175 jmp_buf env;
68} coro_context; 176};
69 177
178#if CORO_LINUX || (_XOPEN_SOURCE >= 600)
70#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)
180#else
181# define coro_transfer(p,n) do { if (!setjmp ((p)->env)) longjmp ((n)->env, 1); } while (0)
182#endif
71 183
72#endif 184#endif
73 185
74void coro_create(coro_context *ctx,
75 coro_func coro, void *arg,
76 void *sptr, long ssize);
77
78#endif 186#endif
79 187

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