pthread_self(3) - Linux manual page (original) (raw)

pthreadself(3) Library Functions Manual pthreadself(3)

NAME top

   pthread_self - obtain ID of the calling thread

LIBRARY top

   POSIX threads library (_libpthread_, _-lpthread_)

SYNOPSIS top

   **#include <pthread.h>**

   **pthread_t pthread_self(void);**

DESCRIPTION top

   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)](../man3/pthread%5Fcreate.3.html) call that created this thread.

RETURN VALUE top

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

ERRORS top

   This function always succeeds.

ATTRIBUTES top

   For an explanation of the terms used in this section, see
   [attributes(7)](../man7/attributes.7.html).
   ┌──────────────────────────────────────┬───────────────┬─────────┐
   │ **Interface** │ **Attribute** │ **Value** │
   ├──────────────────────────────────────┼───────────────┼─────────┤
   │ **pthread_self**()                       │ Thread safety │ MT-Safe │
   └──────────────────────────────────────┴───────────────┴─────────┘

STANDARDS top

   POSIX.1-2008.

HISTORY top

   POSIX.1-2001.

NOTES top

   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 _pthreadt_ can't portably be compared using the C
   equality operator (**==**); use [pthread_equal(3)](../man3/pthread%5Fequal.3.html) 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)](../man2/gettid.2.html).

SEE ALSO top

   [pthread_create(3)](../man3/pthread%5Fcreate.3.html), [pthread_equal(3)](../man3/pthread%5Fequal.3.html), [pthreads(7)](../man7/pthreads.7.html)

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Linux man-pages 6.10 2024-07-23 pthreadself(3)

Pages that refer to this page:gettid(2), pthread_create(3), pthread_equal(3), pthread_getcpuclockid(3), pthread_kill(3), pthread_setaffinity_np(3), pthread_setschedparam(3), pthread_setschedprio(3), pthreads(7), signal-safety(7)