pthread_self(3)

1pthread_self(3)            Library Functions Manual            pthread_self(3)
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NAME

6       pthread_self - obtain ID of the calling thread
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LIBRARY

9       POSIX threads library (libpthread, -lpthread)
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SYNOPSIS

12       #include <pthread.h>
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14       pthread_t pthread_self(void);
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DESCRIPTION

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

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

25       This function always succeeds.
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ATTRIBUTES

28       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
29       tributes(7).
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31       ┌────────────────────────────────────────────┬───────────────┬─────────┐
32       │Interface                                   │ Attribute     │ Value   │
33       ├────────────────────────────────────────────┼───────────────┼─────────┤
34       │pthread_self()                              │ Thread safety │ MT-Safe │
35       └────────────────────────────────────────────┴───────────────┴─────────┘
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STANDARDS

38       POSIX.1-2008.
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HISTORY

41       POSIX.1-2001.
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NOTES

44       POSIX.1 allows an implementation wide freedom in choosing the type used
45       to  represent  a thread ID; for example, representation using either an
46       arithmetic type or a structure is permitted.  Therefore,  variables  of
47       type pthread_t can't portably be compared using the C equality operator
48       (==); use pthread_equal(3) instead.
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50       Thread identifiers should be considered opaque: any attempt  to  use  a
51       thread  ID  other than in pthreads calls is nonportable and can lead to
52       unspecified results.
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54       Thread IDs are guaranteed to be unique only within a process.  A thread
55       ID  may  be  reused after a terminated thread has been joined, or a de‐
56       tached thread has terminated.
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58       The thread ID returned by pthread_self() is not the same thing  as  the
59       kernel thread ID returned by a call to gettid(2).
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