C中的pthread_equal()示例

先决条件：C中的多线程，pthread_self()(带示例)

pthread_equal()=比较两个线程是否相等。此函数比较两个线程标识符。返回“ 0”和非零值。如果相等，则返回非零值，否则返回0。

语法：-int pthread_equal(pthread_t t1，pthread_t t2);

第一种方法：-与自线程比较

// C program to demonstrate working of pthread_equal()
#include 
#include 
#include 
#include 
#include 
  
pthread_t tmp_thread;
  
void* func_one(void* ptr)
{
    // in this field we can compare two thread
    // pthread_self gives a current thread id
    if (pthread_equal(tmp_thread, pthread_self())) {
        printf("equal\n");
    } else {
        printf("not equal\n");
    }
}
  
// driver code
int main()
{
    // thread one
    pthread_t thread_one;
  
    // assign the id of thread one in temporary
    // thread which is global declared   r
    tmp_thread = thread_one;
  
    // create a thread
    pthread_create(&thread_one, NULL, func_one, NULL);
  
    // wait for thread
    pthread_join(thread_one, NULL);
}

输出：

equal

第二种方法：-与其他线程比较

// C program to demonstrate working of pthread_equal()
#include 
#include 
#include 
#include 
#include 
  
// global declared pthread_t variable
pthread_t tmp_thread;
  
void* func_one(void* ptr)
{
    tmp_thread = pthread_self(); // assign the id of thread one in
    // temporary thread which is global declared
}
  
void* func_two(void* ptr)
{
    pthread_t thread_two = pthread_self();
  
    // compare two thread
    if (pthread_equal(tmp_thread, thread_two)) {
        printf("equal\n");
    } else {
        printf("not equal\n");
    }
}
  
int main()
{
    pthread_t thread_one, thread_two;
  
    // creating thread one
    pthread_create(&thread_one, NULL, func_one, NULL);
  
    // creating thread two
    pthread_create(&thread_two, NULL, func_two, NULL);
  
    // wait for thread one
    pthread_join(thread_one, NULL);
  
    // wait for thread two
    pthread_join(thread_two, NULL);
}

输出：

not equal

想要从精选的最佳视频中学习和练习问题，请查看《基础知识到高级C的C基础课程》。