3 互斥锁

互斥锁的初始值为1；
通过互斥锁保护临界区的代码执行；

1、初始化

osSemaphoreId_t sem_mutex;
int count = 0;
sem_mutex = osSemaphoreNew(1, 1, NULL);

2、线程1

osSemaphoreAcquire(sem_mutex, osWaitForever);
count++;
printf("%d\r\n", count);
osSemaphoreRelease(sem_mutex);

3、线程2

osSemaphoreAcquire(sem_mutex, osWaitForever);
count++;
printf("%d\r\n", count);
osSemaphoreRelease(sem_mutex);

4、结论

来源：CSDN

作者：小C菜鸟

链接：https://blog.csdn.net/C_cai_niao/article/details/103929518