pthread_self - obtain ID of the calling thread
POSIX threads library (libpthread, -lpthread)
#include <pthread.h>
pthread_t pthread_self(void);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.
This function always succeeds, returning the calling thread's ID.
This function always succeeds.
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| Thread safety | MT-Safe |
POSIX.1-2008.
POSIX.1-2001.
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 nonportable and can lead to unspecified results.
Thread IDs are guaranteed to be unique only 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).
pthread_create(3), pthread_equal(3), pthreads(7)