Mutex锁定主函数和pthread中其他线程之间的优先级

Question

We can set thread priority by pthread_attr_t , which is the second parameter in pthread_create , but we cannot set the thread priority to the main function by pthread_attr_t .

If the main function and the other thread both wait for the mutex lock, which will get the access to the mutex lock first ?

Answer 1

You cannot predict which thread among many will get a mutex first, regardless of their various priorities.

A thread with a higher priority will be run more frequently, and is more likely to get the lock, there is absolutely no guarantee.

Furthermore, if you ever design code that depends on threads getting locks in a particular order, then you are definitely designing the program incorrectly.