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 92 行

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*
*                            Open Watcom Project
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//
// SPAWN        :  Spawn() and Suicide()
//

#if defined( __WINDOWS__ ) && !defined( __386__ )
#include <windows.h>
#else
#include <setjmp.h>
#endif
#include <stdlib.h>

#if defined( __WINDOWS__ ) && !defined( __386__ )
  #define __setjmp      Catch
  #define __longjmp     Throw
  #define __jmp_buf     CATCHBUF
#else
  #define __setjmp      setjmp
  #define __longjmp     longjmp
  #define __jmp_buf     jmp_buf
#endif

#if defined( __MT__ )

#include "fthread.h"

#define __SpawnStack    (*(__jmp_buf **)&(__FTHREADDATAPTR->__SpawnStack))

#else

static  __jmp_buf       *SpawnStack = { NULL };
#define __SpawnStack    SpawnStack

#endif


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 ) {
//=================

    if( __SpawnStack == NULL ) exit( -1 );
    __longjmp( *__SpawnStack, 1 );
}