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
28       attributes(7).
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30       ┌───────────────┬───────────────┬─────────┐
31       │Interface      │ Attribute     │ Value   │
32       ├───────────────┼───────────────┼─────────┤
33       │pthread_self() │ Thread safety │ MT-Safe │
34       └───────────────┴───────────────┴─────────┘

CONFORMING TO

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

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

60       This  page  is  part of release 4.16 of the Linux man-pages project.  A
61       description of the project, information about reporting bugs,  and  the
62       latest     version     of     this    page,    can    be    found    at
63       https://www.kernel.org/doc/man-pages/.
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67Linux                             2017-09-15                   PTHREAD_SELF(3)