spawn.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 60 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  Spawn() and Suicide() routines.
*
****************************************************************************/


#include <setjmp.h>

static  jmp_buf *SpawnStack;


int     Spawn( void (*fn)( void ) )
//=================================
{
    jmp_buf     *save_env;
    jmp_buf     env;
    int         status;

    save_env = SpawnStack;
    SpawnStack = env;
    status = setjmp( env );
    if( status == 0 ) {
        (*fn)();
    }
    SpawnStack = save_env;
    return( status );
}


void    Suicide( void )
//=====================
{
    longjmp( SpawnStack, 1 );
}