The threa_cancel() is used to cancel one particular thread by the thread id. This function sends one cancellation request to the thread for termination. The syntax of the pthread_cancel() is like below −
int pthread_cancel(pthread_t th);
现在，让我们看看如何使用这个函数来取消线程。
Shell本身是一个用C语言编写的程序，它是用户使用Linux的桥梁。Shell既是一种命令语言，又是一种程序设计语言。作为命令语言，它交互式地解释和执行用户输入的命令；作为程序设计语言，它定义了各种变量和参数，并提供了许多在高级语言中才具有的控制结构，包括循环和分支。它虽然不是Linux系统核心的一部分，但它调用了系统核心的大部分功能来执行程序、建立文件并以并行的方式协调各个程序的运行。因此，对于用户来说，shell是最重要的实用程序，深入了解和熟练掌握shell的特性极其使用方法，是用好Linux系统
示例
#include#include #include #include int count = 0; pthread_t sample_thread; void* thread_one_func(void* p) { while (1) { printf("This is thread 1 "); sleep(1); // wait for 1 seconds count++; if (count == 5) { //if the counter is 5, then request to cancel thread two and exit from current thread pthread_cancel(sample_thread); pthread_exit(NULL); } } } void* thread_two_func(void* p) { sample_thread = pthread_self(); //store the id of thread 2 while (1) { printf("This is thread 2
"); sleep(2); // wit for 2 seconds } } main() { pthread_t t1, t2; //create two threads pthread_create(&t1, NULL, thread_one_func, NULL); pthread_create(&t2, NULL, thread_two_func, NULL); //wait for completing threads pthread_join(t1, NULL); pthread_join(t2, NULL); }
输出
This is thread 2 This is thread 1 This is thread 1 This is thread 2 This is thread 1 This is thread 1 This is thread 1 This is thread 2 This is thread 2 This is thread 2 This is thread 2 This is thread 2 This is thread 2 This is thread 2 This is thread 2 This is thread 2 This is thread 2 This is thread 2 This is thread 2
