pthread_detach(3)

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

6       pthread_detach - detach a thread
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SYNOPSIS

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

16       The  pthread_detach() function marks the thread identified by thread as
17       detached.  When a detached thread terminates, its resources  are  auto‐
18       matically  released  back  to  the  system without the need for another
19       thread to join with the terminated thread.
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21       Attempting to detach an already detached thread results in  unspecified
22       behavior.
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RETURN VALUE

25       On  success,  pthread_detach() returns 0; on error, it returns an error
26       number.
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ERRORS

29       EINVAL thread is not a joinable thread.
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31       ESRCH  No thread with the ID thread could be found.
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ATTRIBUTES

34       For an  explanation  of  the  terms  used  in  this  section,  see  at‐
35       tributes(7).
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37       ┌────────────────────────────────────────────┬───────────────┬─────────┐
38       │Interface                                   │ Attribute     │ Value   │
39       ├────────────────────────────────────────────┼───────────────┼─────────┤
40       │pthread_detach()                            │ Thread safety │ MT-Safe │
41       └────────────────────────────────────────────┴───────────────┴─────────┘
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CONFORMING TO

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

47       Once   a   thread   has   been   detached,  it  can't  be  joined  with
48       pthread_join(3) or be made joinable again.
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50       A new thread can be created in a detached state using pthread_attr_set‐
51       detachstate(3)  to  set  the detached attribute of the attr argument of
52       pthread_create(3).
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54       The detached attribute merely determines the  behavior  of  the  system
55       when  the  thread terminates; it does not prevent the thread from being
56       terminated if the process terminates using exit(3) (or equivalently, if
57       the main thread returns).
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59       Either  pthread_join(3)  or  pthread_detach() should be called for each
60       thread that an application creates, so that system  resources  for  the
61       thread  can  be  released.  (But note that the resources of any threads
62       for which one of these actions has not been done will be freed when the
63       process terminates.)
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EXAMPLES

66       The following statement detaches the calling thread:
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68           pthread_detach(pthread_self());
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COLOPHON

75       This page is part of release 5.12 of the Linux  man-pages  project.   A
76       description  of  the project, information about reporting bugs, and the
77       latest    version    of    this    page,    can     be     found     at
78       https://www.kernel.org/doc/man-pages/.
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82Linux                             2021-03-22                 PTHREAD_DETACH(3)