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pthread_self() in C with Example

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  • Difficulty Level : Expert
  • Last Updated : 28 Oct, 2019
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Prerequisite : Multithreading in C

Syntax :- pthread_t pthread_self(void);

The pthread_self() function returns the ID of the thread in which it is invoked.

// C program to demonstrate working of pthread_self()
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>
void* calls(void* ptr)
    // using pthread_self() get current thread id
    printf("In function \nthread id = %d\n", pthread_self());
    return NULL;
int main()
    pthread_t thread; // declare thread
    pthread_create(&thread, NULL, calls, NULL);
    printf("In main \nthread id = %d\n", thread); 
    pthread_join(thread, NULL); 
    return 0;


In function
thread id = 1
In main
thread id = 1

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