s3_sem.c

来自「tornado2.2开发」· C语言 代码 · 共 47 行

#include "vxWorks.h"
#include "semLib.h"
#include "taskLib.h"
#include "stdio.h"

#define ITER 10
SEM_ID semBinary;
int global = 0;

static void taskOne(void)
{
    int i;
    for (i=0;i<ITER;i++)
    {
        semTake(semBinary,WAIT_FOREVER);
        printf("I am taskOne and global = %d............\n",
            ++global);
        semGive(semBinary);
    }
}

static void taskTwo(void)
{
    int i;
    semGive(semBinary);
    for (i=0;i<ITER;i++)
    {
        semTake(semBinary,WAIT_FOREVER);
        printf("I am taskTwo and global = %d............\n",
            --global);
        semGive(semBinary);
    }
}

void s3_sem(void)
{
    int taskIdOne,taskIdTwo;
    semBinary = semBCreate(SEM_Q_FIFO,SEM_FULL);
    semTake(semBinary,WAIT_FOREVER);

    taskIdOne = taskSpawn("t1",90,0x100,2000,
          (FUNCPTR)taskOne,0,0,0,0,0,0,0,0,0,0);
    taskIdTwo = taskSpawn("t2",90,0x100,2000,
          (FUNCPTR)taskTwo,0,0,0,0,0,0,0,0,0,0);

}