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Diffstat (limited to 'coro.h')
-rw-r--r-- | coro.h | 79 |
1 files changed, 79 insertions, 0 deletions
@@ -0,0 +1,79 @@ +/* + * Copyright (c) 2001 Marc Alexander Lehmann <pcg@goof.com> + * + * Redistribution and use in source and binary forms, with or without modifica- + * tion, are permitted provided that the following conditions are met: + * + * 1. Redistributions of source code must retain the above copyright notice, + * this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MER- + * CHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO + * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPE- + * CIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; + * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTH- + * ERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * + * This library is modelled strictly after Ralf S. Engelschalls article at + * http://www.gnu.org/software/pth/rse-pmt.ps. So most of the credit must + * go to Ralf S. Engelschall <rse@engelschall.com>. + * + * This coroutine library is very much stripped down. You should either + * build your own process avstraction using it or - better - just use GNU + * Portable Threads, http://www.gnu.org/software/pth/. + */ + +#ifndef CORO_H +#define CORO_H + +typedef void (*coro_func)(void *); + +#if defined(WINDOWS) +# define CORO_LOOSE 1 /* you don't win with windoze */ +#elif defined(HAVE_UCONTEXT_H) +# define CORO_UCONTEXT 1 +#elif defined(HAVE_SETJMP_H) && defined(HAVE_SIGALTSTACK) +# define CORO_SJLJ 1 +#else +error unknown or unsupported architecture +#endif + +#if CORO_UCONTEXT + +#include <ucontext.h> + +typedef struct { + ucontext_t uc; +} coro_context; + +#define coro_transfer(p,n) swapcontext(&((p)->uc), &((n)->uc)) + +#elif CORO_SJLJ || CORO_LOOSE + +#include <setjmp.h> + +typedef struct { + jmp_buf env; +} coro_context; + +#define coro_transfer(p,n) if (!setjmp ((p)->env)) longjmp ((n)->env, 1) + +#endif + +void coro_create(coro_context *ctx, + coro_func coro, void *arg, + void *sptr, long ssize); + +#endif + |