C++ Multithreaded Programming On Linux

POSIX multi-threading model pthread.h function:

pthread_attr_t attr; //线程属性结构体，创建线程时加入的参数
pthread_attr_init( &attr ); //初始化  
pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_JOINABLE ); 
//是设///置你想要指定线程属性参数，这个参数表明这个线程是可以join连接的，join功//能表示主程序可以等线程结束后再去做某事，实现了主程序和线程同步功能  
pthread_t tid1, tid2; //保存两个线程id
int ret = pthread_create( &tid1, &attr, say_hello1, ( void* )&index1 ); //创建线程1
ret = pthread_create( &tid2, &attr, say_hello2, ( void* )&index2 );  //创建线程2
pthread_join( tid1, NULL ); //连接两个线程  
pthread_join( tid2, NULL );

Function used for mutex lock:

pthread_mutex_t sum_mutex; //互斥锁
pthread_mutex_init( &sum_mutex, NULL ); //对锁进行初始化
pthread_mutex_lock( &sum_mutex ); //占用锁
//do something here..
pthread_mutex_unlock( &sum_mutex ); //释放锁
pthread_mutex_destroy( &sum_mutex ); //对锁进行注销

Functions used by semaphores:

pthread_cond_t tasks_cond; //条件信号变量
pthread_cond_init( &tasks_cond, NULL ); //对条件信号变量进行初始化
pthread_cond_signal( &tasks_cond ); //条件满足, 发送信号
pthread_cond_wait( &tasks_cond, &tasks_mutex ); //等待信号
pthread_cond_destroy( &tasks_cond ); //对条件信号变量进行注销

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