int SLang_init_tty(int abort_char, int dum2, int dum3)
{
VIOCURSORINFO cursorInfo, OldcursorInfo;
(void) dum2; (void) dum3;
if (abort_char == -1) abort_char = 3; /* ^C */
SLang_Abort_Char = abort_char;
SLKeyBoard_Quit = 0;
/* set ^C off */
signal (SIGINT, SIG_IGN);
signal (SIGBREAK, SIG_IGN);
/* set up the keyboard */
initialKbdInfo.cb = sizeof(initialKbdInfo);
KbdGetStatus(&initialKbdInfo, 0);
set_kbd();
/* open a semaphore */
CreateSem();
/* start a separate thread to read the keyboard */
#if defined(__BORLANDC__)
SLos2_threadID = _beginthread (thread_code, 8096, NULL);
#else
SLos2_threadID = _beginthread (thread_code, NULL, 8096, NULL);
#endif
if ((int)SLos2_threadID == -1)
{
SLang_exit_error ("init_tty: Error starting keyboard thread.");
}
VioGetCurType (&OldcursorInfo, 0);
cursorInfo.yStart = 1;
cursorInfo.cEnd = 15;
cursorInfo.cx = 1;
cursorInfo.attr = 1;
if (VioSetCurType (&cursorInfo, 0))
VioSetCurType (&OldcursorInfo, 0); /* reset to previous value */
return 0;
}
int main(void)
{
key_t key; /*信号量的键值*/
int semid; /*信号量的ID*/
char i;
int value = 0;
key = ftok("/ipc/sem",'a'); /*建立信号量的键值*/
semid = CreateSem(key,100); /*建立信号量*/
for (i = 0;i <= 3;i++){ /*对信号量进行3次增减操作*/
Sem_P(semid); /*增加信号量*/
Sem_V(semid); /*减小信号量*/
}
value = GetvalueSem(semid); /*获得信号量的值*/
printf("信号量值为:%d\n",value); /*打印结果*/
DestroySem(semid); /*销毁信号量*/
return 0;
}
