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Editorial Team
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Asked: 2026-06-16T17:04:25+00:00

I’m trying to find a way to uniquely identify threads in a multi-process environment.

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I’m trying to find a way to uniquely identify threads in a multi-process environment. I have a server that keeps track of the different processes connecting to it, some of which are multi-threaded and some of which are not. To identify the threads from multi-threaded connections I’m using the thread ID as a unique identifier (there will be a maximum of 1 multi-threaded process connected at any given time). My question is: is it possible the thread ID of one of these threads could be the same as the process ID of another processes running on the system?

Thanks in advance for the help!

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1 Answer

  1. Editorial Team

    The TID (as returned by the sys_gettid() system call) is unique across all threads on the system1, and for a single-threaded process the PID and TID are equal. This means that a TID will never clash with a PID from another process.

    1. With the caveat that if PID namespaces are in use, TIDs and PIDs are only unique within the same PID namespace.

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