PTHREAD_SELF

Section: Linux Programmer's Manual (3)
Updated: 2008-10-24
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NAME

pthread_self - obtain ID of the calling thread

SYNOPSIS

#include <pthread.h>

pthread_t pthread_self(void);

Compile and link with -pthread.

DESCRIPTION

The pthread_self() function returns the ID of the calling thread. This is the same value that is returned in *thread in the pthread_create(3) call that created this thread.

RETURN VALUE

This function always succeeds, returning the calling thread's ID.

ERRORS

This function always succeeds.

CONFORMING TO

POSIX.1-2001.

NOTES

POSIX.1 allows an implementation wide freedom in choosing the type used to represent a thread ID; for example, representation using either an arithmetic type or a structure is permitted. Therefore, variables of type pthread_t can't portably be compared using the C equality operator (==); use pthread_equal(3) instead.

Thread identifiers should be considered opaque: any attempt to use a thread ID other than in pthreads calls is non-portable and can lead to unspecified results.

Thread IDs are only guaranteed to be unique within a process. A thread ID may be reused after a terminated thread has been joined, or a detached thread has terminated.

The thread ID returned by pthread_self() is not the same thing as the kernel thread ID returned by a call to gettid(2).

COLOPHON

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