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Asked: 2026-06-12T08:09:51+00:00

I am new to multi threading and am following Advanced programming in unix environment.

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I am new to multi threading and am following “Advanced programming in unix environment”. I am not able to get the order in which the threads are executed. I have the following code.

int err1 = pthread_create(&first, NULL, disp, a);
int err2 = pthread_create(&second, NULL, disp, b);
int err3 = pthread_create(&third, NULL, disp, c);

But the thread related to third tid is executing first, then the second and finally the first. Not sure if this is the behavior or something going wrong.

Thx!
Rahul.

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1 Answer

  1. Editorial Team

    There is no guarantee about the order of executing the code once they are created.
    Only thing that can be guaranteed is that Thread 3 will be created after Thread 2 and Thread 2 will be created after Thread 1.
    You cannot predict or assume that thread 2 will be spawned only after certain code has executed in thread 1. If you want to achieve something like that you need to provide your some Thread synchronization.

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