/*** $Id: drawsemop.c,v 1.14 2003/09/04 03:46:47 weiym Exp $**** drawsemop.c: operations for drawing semaphore.**** Copyright (C) 2003 Feynman Software.** Copyright (C) 1999 ~ 2002 Wei Yongming.**** Current maintainer: Wei Yongming.**** Create date: 2000/12/31*//*** This program is free software; you can redistribute it and/or modify** it under the terms of the GNU General Public License as published by** the Free Software Foundation; either version 2 of the License, or** (at your option) any later version.**** This program is distributed in the hope that it will be useful,** but WITHOUT ANY WARRANTY; without even the implied warranty of** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the** GNU General Public License for more details.**** You should have received a copy of the GNU General Public License** along with this program; if not, write to the Free Software** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA*//*** TODO:*/ #include <sys/types.h>#include <sys/socket.h>#include <sys/stat.h>#include <sys/un.h>#include <stdio.h>#include <string.h>#include <unistd.h>#include <errno.h>#include "common.h"#include "minigui.h"#include "ourhdr.h"#include "sharedres.h"#include "drawsemop.h"#define SEM_TIMEOUT     500void unlock_draw_sem (void){    struct sembuf sb;again:    sb.sem_num = 0;    sb.sem_op = 1;    sb.sem_flg = SEM_UNDO;    if (semop (SHAREDRES_SEMID, &sb, 1) == -1) {        if (errno == EINTR) {            goto again;        }    }}void lock_draw_sem (void){    struct sembuf sb;again:    sb.sem_num = 0;    sb.sem_op = -1;    sb.sem_flg = SEM_UNDO;    if (semop (SHAREDRES_SEMID, &sb, 1) == -1) {        if (errno == EINTR) {            goto again;        }    }}#ifdef _CURSOR_SUPPORTvoid inc_hidecursor_sem (void){    struct sembuf sb;again:    sb.sem_num = 2;    sb.sem_op = 1;    sb.sem_flg = 0;    if (semop (SHAREDRES_SEMID, &sb, 1) == -1) {        if (errno == EINTR) {            goto again;        }    }}#endif /* _CURSOR_SUPPORT */