c - 销毁静态互斥体和 rwlock 初始值设定项

Question

假设我们有一个用静态初始化器初始化的全局互斥锁或 rwlock:

pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;

或

pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER;

文档说它等同于带有默认参数的 pthread_*_init。

我们是否必须销毁以这种方式初始化的互斥锁或 rwlock？

Answer 1

没有。静态分配和动态分配的互斥量之间的区别基本上类似于位于堆栈或堆中的变量。您不必归还不是动态分配的互斥量。引自 Michael Kerrisk 的“The Linux Programming Interface”:

When an automatically or dynamically allocated mutex is no longer required, it should be destroyed using pthread_mutex_destroy(). (It is not necessary to call pthread_mutex_destroy() on a mutex that was statically initialized using PTHREAD_MUTEX_INITIALIZER.)