In C language, pthread_self() means to get the ID of the current thread

Here we look at the role of pthread_self() in C language. The pthread_self() function is used to obtain the ID of the current thread. This function uniquely identifies an existing thread. But if there are multiple threads, and one thread completes, then the id can be reused. Therefore, the id is unique for all running threads.

Example

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
void* func(void* p) {
   printf("From the function, the thread id = %d</p><p>", pthread_self()); //get current thread id
      pthread_exit(NULL);
   return NULL;
}
main() {
   pthread_t thread; // declare thread
   pthread_create(&thread, NULL, func, NULL);
   printf("From the main function, the thread id = %d</p><p>", thread);
   pthread_join(thread, NULL); //join with main thread
}

Output

From the main function, the thread id = 1
From the function, the thread id = 1

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