pthread_detach(3p) [centos man page]

PTHREAD_DETACH(3P)					     POSIX Programmer's Manual						PTHREAD_DETACH(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       pthread_detach - detach a thread

SYNOPSIS

       #include <pthread.h>

       int pthread_detach(pthread_t thread);

DESCRIPTION

       The pthread_detach() function shall indicate to the implementation that storage for the thread thread can be  reclaimed	when  that  thread
       terminates.  If	thread has not terminated, pthread_detach() shall not cause it to terminate. The effect of multiple pthread_detach() calls
       on the same target thread is unspecified.

RETURN VALUE

       If the call succeeds, pthread_detach() shall return 0; otherwise, an error number shall be returned to indicate the error.

ERRORS

       The pthread_detach() function shall fail if:

       EINVAL The implementation has detected that the value specified by thread does not refer to a joinable thread.

       ESRCH  No thread could be found corresponding to that specified by the given thread ID.

       The pthread_detach() function shall not return an error code of [EINTR].

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       None.

RATIONALE

       The pthread_join() or pthread_detach() functions should eventually be called for every thread that is created so  that  storage	associated
       with the thread may be reclaimed.

       It  has	been  suggested that a "detach" function is not necessary; the detachstate thread creation attribute is sufficient, since a thread
       need never be dynamically detached. However, need arises in at least two cases:

	1. In a cancellation handler for a pthread_join() it is nearly essential to have a pthread_detach() function in order to detach the thread
	   on  which  pthread_join()  was  waiting.  Without it, it would be necessary to have the handler do another pthread_join() to attempt to
	   detach the thread, which would both	delay  the  cancellation  processing  for  an  unbounded  period  and  introduce  a  new  call	to
	   pthread_join(), which might itself need a cancellation handler. A dynamic detach is nearly essential in this case.

	2. In order to detach the "initial thread" (as may be desirable in processes that set up server threads).

FUTURE DIRECTIONS

       None.

SEE ALSO

       pthread_join(), the Base Definitions volume of IEEE Std 1003.1-2001, <pthread.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
       and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can  be  obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003							PTHREAD_DETACH(3P)

Check Out this Related Man Page

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

NAME

       pthread_detach - detach a thread

SYNOPSIS

       #include <pthread.h>

       int pthread_detach(pthread_t thread);

       Compile and link with -pthread.

DESCRIPTION

       The  pthread_detach()  function	marks  the  thread identified by thread as detached.  When a detached thread terminates, its resources are
       automatically released back to the system without the need for another thread to join with the terminated thread.

       Attempting to detach an already detached thread results in unspecified behavior.

RETURN VALUE

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

ERRORS

       EINVAL thread is not a joinable thread.

       ESRCH  No thread with the ID thread could be found.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).

       +-----------------+---------------+---------+
       |Interface	 | Attribute	 | Value   |
       +-----------------+---------------+---------+
       |pthread_detach() | Thread safety | MT-Safe |
       +-----------------+---------------+---------+

CONFORMING TO

       POSIX.1-2001, POSIX.1-2008.

NOTES

       Once a thread has been detached, it can't be joined with pthread_join(3) or be made joinable again.

       A new thread can be created in a detached state using pthread_attr_setdetachstate(3) to set the detached attribute of the attr argument	of
       pthread_create(3).

       The  detached  attribute merely determines the behavior of the system when the thread terminates; it does not prevent the thread from being
       terminated if the process terminates using exit(3) (or equivalently, if the main thread returns).

       Either pthread_join(3) or pthread_detach() should be called for each thread that an application creates, so that system resources  for  the
       thread  can  be	released.  (But note that the resources of any threads for which one of these actions has not been done will be freed when
       the process terminates.)

EXAMPLE

       The following statement detaches the calling thread:

	   pthread_detach(pthread_self());

SEE ALSO

       pthread_attr_setdetachstate(3), pthread_cancel(3), pthread_create(3), pthread_exit(3), pthread_join(3), pthreads(7)

COLOPHON

       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

Linux								    2017-09-15							 PTHREAD_DETACH(3)

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pthread_detach(3p) [centos man page]

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