pthread_self - get the calling thread ID
The pthread_self() function shall return the thread ID of the calling thread.
The pthread_self() function shall always be successful and no return value is reserved to indicate an error.
No errors are defined.
The pthread_self() function provides a capability similar to the getpid() function for processes and the rationale is the same: the creation call does not provide the thread ID to the created thread.
First released in Issue 5. Included for alignment with the POSIX Threads Extension.
The pthread_self() function is marked as part of the Threads option.
Austin Group Interpretation 1003.1-2001 #063 is applied, updating the RETURN VALUE section.
The pthread_self() function is moved from the Threads option to the Base.
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