batpipe.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 64 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
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*    available at www.sybase.com/developer/opensource.
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* Description:  WHEN YOU FIGURE OUT WHAT THIS FILE DOES, PLEASE
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****************************************************************************/


#include <windows.h>
#include "batpipe.h"

char                    *SharedMem;
HANDLE                  SemReadUp;
HANDLE                  SemWritten;
HANDLE                  SemReadDone;

unsigned BatservRead( void *buff, unsigned len )
{
    unsigned    bytes_read;

    ReleaseSemaphore( SemReadUp, 1, NULL );
    WaitForSingleObject( SemWritten, INFINITE );
    bytes_read = *(unsigned*)SharedMem;
    if( bytes_read > len ) bytes_read = len;
    memcpy( buff, SharedMem + sizeof( unsigned ), bytes_read );
    ReleaseSemaphore( SemReadDone, 1, NULL );
    return( bytes_read );
}

unsigned BatservWrite( void *buff, unsigned len )
{
    WaitForSingleObject( SemReadUp, INFINITE );
    *(unsigned*)SharedMem = len;
    memcpy( SharedMem + sizeof( unsigned ), buff, len );
    ReleaseSemaphore( SemWritten, 1, NULL );
    WaitForSingleObject( SemReadDone, INFINITE );
    return( len );
}