我们知道,当调用signal/broadcast唤醒等待条件变量的其他线程时,既可以在加锁的情况下调用signal/broadcast,也可以在解锁的情况下调用. 那么,到底哪种情况更好呢?man手册中其实已经给出了答案: The pthread_cond_broadcast() or pthread_cond_signal() functions may be called by a thread whether or not it currently owns the mutex that…
深入解析条件变量 什么是条件变量(condition variables) 引用APUE中的一句话: Condition variables are another synchronization mechanism available to threads. These synchronization objects provide a place for threads to rendezvous. When used with mutexes, condition variables al…
1. Goroutine同步[数据同步] 为什么需要goroutine同步 gorotine同步概念.以及同步的几种方式 1.1 为什么需要goroutine同步 package main import ( "fmt" "sync" ) var A = 10 var wg = sync.WaitGroup{} func Add(){ defer wg.Done() for i:=0;i<1000000;i++{ A += 1 } } func main() {…
Posix条件变量 int pthread_cond_init(pthread_cond_t *cond, pthread_condattr_t *cond_attr); int pthread_cond_destroy(pthread_cond_t *cond); int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex); int pthread_cond_timedwait(pthread_cond_t *cond…
