typedef struct __lock_t { int flag; } lock_t;

int TestAndSet(int *ptr, int new) { int old = *ptr; *ptr = new; return old; }

void init(lock_t *mutex) { // 0: lock is available // 1: lock is held mutex->flag = 0; }

void lock(lock_t *mutex) { while (mutex->flag == 1) { // Test the flag. ; // Wait the lock mutex->flag = 1; // Set the lock, i.e. start to hold lock } }

void unlock(lock_t * mutex) { mutex->flag = 0; }

转载于:https://www.cnblogs.com/liugangBlog/p/11267166.html

原文链接：https://blog.csdn.net/weixin_30342827/article/details/101385856

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