VxWorks中使用互斥锁的示例代码

本示例代码展示了在VxWorks中如何使用互斥锁来实现多任务并发控制，避免数据竞争和死锁问题。

#include "vxWorks.h"
#include "semLib.h"

SEM_ID mutex_sem;

void task1(void)
{
    while (1)
    {
        semTake (mutex_sem, WAIT_FOREVER);//等待互斥锁
        printf ("This is task1.\n");
        semGive (mutex_sem);//释放互斥锁
    }
}

void task2(void)
{
    while (1)
    {
        semTake (mutex_sem, WAIT_FOREVER);//等待互斥锁
        printf ("     This is task2.\n");
        semGive (mutex_sem);//释放互斥锁
    }
}

void task3(void)
{
    while (1)
    {
        semTake (mutex_sem, WAIT_FOREVER);//等待互斥锁
        printf ("          This is task3.\n");
        semGive (mutex_sem);//释放互斥锁
    }
}

void main (void)
{
    mutex_sem = semBCreate (SEM_Q_PRIORITY, SEM_FULL);
    taskSpawn ("t1", 100, 0, 4000, (FUNCPTR)task1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0); //创建任务1
    taskSpawn ("t2", 100, 0, 4000, (FUNCPTR)task2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0); //创建任务2
    taskSpawn ("t3", 100, 0, 4000, (FUNCPTR)task3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0); //创建任务3
}

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