#include<stdio.h>#include<pthread.h>// 声明一个读写锁变量pthread_rwlock_t rwlock;// 共享的数据int shared_data=0;// 读线程的函数void*reader(void*arg){while(1){// 读线程尝试获取读锁pthread_rwlock_rdlock(&rwlock);// 读取共享数据printf("Reader: %d\n",shared_data);// 释放读锁pthread_...
pthread_t ptw32_threadReusePop (void);voidptw32_threadReusePush (pthread_t thread);intptw32_getprocessors (int*count);intptw32_setthreadpriority (pthread_t thread,intpolicy,intpriority);voidptw32_rwlock_cancelwrwait (void*arg);#if! defined (__MINGW32__) || defined (__MSVCRT__)unsigned ...
1. 当我们使用pthread_rwlock_rdlock()获取一次读锁时,__nr_readers字段就会加一,注意,就算是同一个线程,在已经获得读锁的情况下,再去获取读锁,__nr_readers字段仍然会加一的,当我们调用pthread_rwlock_unlock()一次时,__nr_readers就会减一,如果我们重复加了读锁,必须重复调用pthread_rwlock_unlock()来使__nr...
定义读写锁: pthread_rwlock_t m_rw_lock; 函数原型: pthread_rwlock_init(pthread_rwlock_t * ,pthread_rwattr_t *); 返回值:0,表示成功,非0为一错误码 读写锁的销毁: 函数原型: pthread_rwlock_destroy(pthread_rwlock_t* ); 返回值:0,表示成功,非0表示错误码 获取读写锁的读锁操作:分为阻塞式获...
pthread_cond_t prev; }; struct pthread_condattr_t_ { int pshared; }; #define PTW32_RWLOCK_MAGIC 0xfacade2 struct pthread_rwlock_t_ { pthread_mutex_t mtxExclusiveAccess; pthread_mutex_t mtxSharedAccessCompleted; pthread_cond_t cndSharedAccessCompleted; ...
pthread_rwlock_destroy pthread栅栏(barrier) 栅栏(Barrier)是并行计算中的一种同步方法。对于一群进程或线程,程序中的一个同步屏障意味着任何线程/进程执行到此后必须等待,直到所有线程/进程都到达此点才可继续执行下文。 pthread_barrier_t pthread_barrier_init ...
pthread _t pthread_self(void); 4.线程的创建 创建线程调用pthread_create函数: #include <pthread.h> int pthread_create( pthread_t*restrict tidp, constpthread_attr_t*restrict attr, void*(*start_rtn)(void*),void*restrict arg); 参数说明: ...
pthread_cond_broadcast (pthread_cond_t *c) int Unblocks all threads that are currently blocked on the condition variable cond. pthread_cond_signal (pthread_cond_t *c) int Unblocks a thread. pthread_rwlock_init (pthread_rwlock_t *__restrict rw, const pthread_rwlockattr_t *__restrict...
(pthread_t)); pthread_barrier_init(&barrier, NULL, thread_num); //等待所有线程同步 for (int i = 0; i < thread_num;i++){ targ[i] = i; pthread_create(&(threads[i]), NULL, worker, &targ[i]); } for (int i = 0; i < thread_num;i++){ pthread_join(threads[i], NULL)...
当你在编译一个使用了POSIX线程(pthread)读写锁(pthread_rwlock_t)的程序时,遇到“undefined reference to pthread_rwlock_init'”这样的错误,通常意味着链接器没有找到pthread_rwlock_init`函数的定义。这个函数是POSIX线程库的一部分,用于初始化一个读写锁。以下是一些解决这个问题的步骤: 确认pthread_rwlock_init函...