在C語言中，pthread_cancel()函數的意思是取消一個線程

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(low) 3thread) like −

int pthread_cancel(pthread_t th);

現在，讓我們看看如何使用這個函數來取消執行緒。

範例

#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <pthread.h>
int count = 0;
pthread_t sample_thread;
void* thread_one_func(void* p) {
   while (1) {
      printf("This is thread 1</p><p>");
      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</p><p>");
      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);
}

輸出

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

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