PTHREAD_DETACH(3P) POSIX Programmer's Manual PTHREAD_DETACH(3P)
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.
pthread_detach - detach a thread
int pthread_detach(pthread_t thread);
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.
If the call succeeds, pthread_detach() shall return 0; otherwise, an error number shall be returned to indicate the error.
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.
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).
pthread_join(), the Base Definitions volume of IEEE Std 1003.1-2001, <pthread.h>
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 .
/The Open Group 2003 PTHREAD_DETACH(3P)