pthread_self(3)

1PTHREAD_SELF(3)            Linux Programmer's Manual           PTHREAD_SELF(3)
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NAME

6       pthread_self - obtain ID of the calling thread
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SYNOPSIS

9       #include <pthread.h>
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11       pthread_t pthread_self(void);
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13       Compile and link with -pthread.
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DESCRIPTION

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

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

24       This function always succeeds.
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ATTRIBUTES

27       For  an  explanation  of  the  terms  used  in  this  section,  see at‐
28       tributes(7).
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30       ┌────────────────────────────────────────────┬───────────────┬─────────┐
31       │Interface                                   │ Attribute     │ Value   │
32       ├────────────────────────────────────────────┼───────────────┼─────────┤
33       │pthread_self()                              │ Thread safety │ MT-Safe │
34       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

37       POSIX.1-2001, POSIX.1-2008.
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NOTES

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

61       This  page  is  part of release 5.13 of the Linux man-pages project.  A
62       description of the project, information about reporting bugs,  and  the
63       latest     version     of     this    page,    can    be    found    at
64       https://www.kernel.org/doc/man-pages/.
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68Linux                             2021-03-22                   PTHREAD_SELF(3)