prerequisite: Multithreading, pthread_self() in C with Example
pthread_cancel() = This function cancel a particular thread using thread id. This function send a cancellation request to the thread.
Syntax : – int pthread_cancel(pthread_t thread);
First Program : – Cancel self thread
// C program to demonstrates cancellation of self thread // using thread id #include <stdio.h> #include <stdlib.h> #include <pthread.h> void* calls(void* ptr) { printf("GeeksForGeeks"); // To exit the current thread // pthread_self() return the particular thread id pthread_cancel(pthread_self()); return NULL; } int main() { // NULL when no attribute pthread_t thread; // calls is a function name pthread_create(&thread, NULL, calls, NULL); // Waiting for when thread is completed pthread_join(thread, NULL); return 0; } |
Output:
GeeksForGeeks
If you use Linux then compile this program gcc program_name.c -lpthread
Second Program : – Cancel other thread
// C program to demonstrates cancellation of another thread // using thread id #include <stdio.h> #include <unistd.h> #include <sys/types.h> #include <pthread.h> // To Count int counter = 0; // for temporary thread which will be // store thread id of second thread pthread_t tmp_thread; // thread_one call func void* func(void* p) { while (1) { printf("thread number one
"); sleep(1); // sleep 1 second counter++; // for exiting if counter = = 5 if (counter = = 2) { // for cancel thread_two pthread_cancel(tmp_thread); // for exit from thread_one pthread_exit(NULL); } } } // thread_two call func2 void* func2(void* p) { // store thread_two id to tmp_thread tmp_thread = pthread_self(); while (1) { printf("thread Number two"); sleep(1); // sleep 1 second } } // Driver code int main() { // declare two thread pthread_t thread_one, thread_two; // create thread_one pthread_create(&thread_one, NULL, func, NULL); // create thread_two pthread_create(&thread_two, NULL, func2, NULL); // waiting for when thread_one is completed pthread_join(thread_one, NULL); // waiting for when thread_two is completed pthread_join(thread_two, NULL); } |
Output:
thread number one thread number two thread number one thread number two
If you use Linux then compile this program gcc program_name.c -lpthread
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