Webpthread_cond_signal 使在条件变量上等待的线程中的一个线程重新开始。如果没有等待的线程，则什么也不做。如果有多个线程在等待该条件，只有一个能重启动，但不能指定哪一 … WebApr 21, 2015 · 1 Answer. Yes, if both B and C are blocked on the condition variable and no other threads are blocked on the condition variable, then calling pthread_cond_signal () twice with the mutex held is guaranteed to (eventually) wake them both up. The pthread_cond_signal () function shall unblock at least one of the threads that are blocked …

c - Signal handling in pthreads - Stack Overflow

Webpthread_mutex_unlock (&lock); pthread_cond_signal (&cond); 这样一样可以。. lock不是用来保护signal的,而是用来保证一种顺序. ①将要调用signal的线程进行conditon赋值. ②之后 … WebDec 7, 2024 · There are several problems with your code: ptr is not initialised, so all the ptr-> parts will crash the program; you are calling pthread_kill() immediately, very likely before the signal handler has been installed, and in a thread (which has unspecified behaviour); you call printf() from a signal handler, which is not guaranteed to work (see man 7 signal for a list … jb andrews firestone

pthread_cond_signal该放在什么地方？ - 南哥的天下 - 博客园

WebGeneral description. Blocks on a condition variable. It must be called with mutex locked by the calling thread, or undefined behavior will result. A mutex is locked using pthread_mutex_lock(). cond is a condition variable that is shared by threads. To change it, a thread must hold the mutex associated with the condition variable. The … WebSep 16, 2024 · 1. 1) TH1 locks the mutex 2) TH1 unlocks the mutex (with pthread_cond) 3) TH2 locks the mutex 4) TH2 unlocks the mutex and sends the signal 5) TH1 gets the … WebMar 16, 2024 · 61. Condition variables should be used as a place to wait and be notified. They are not the condition itself and they are not events. The condition is contained in the surrounding programming logic. The typical usage pattern of condition variables is. // safely examine the condition, prevent other threads from // altering it pthread_mutex_lock ... jb andrews gym