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pthread_detach.c
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pthread_detach.c
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/*
* pthread_detach.c
*
* Description:
* This translation unit implements functions related to thread
* synchronisation.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2005 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "pthread.h"
#include "implement.h"
/*
* Not needed yet, but defining it should indicate clashes with build target
* environment that should be fixed.
*/
#ifndef WINCE
# include <signal.h>
#endif
int
pthread_detach (pthread_t thread)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function detaches the given thread.
*
* PARAMETERS
* thread
* an instance of a pthread_t
*
*
* DESCRIPTION
* This function detaches the given thread. You may use it to
* detach the main thread or to detach a joinable thread.
* NOTE: detached threads cannot be joined;
* storage is freed immediately on termination.
*
* RESULTS
* 0 successfully detached the thread,
* EINVAL thread is not a joinable thread,
* ENOSPC a required resource has been exhausted,
* ESRCH no thread could be found for 'thread',
*
* ------------------------------------------------------
*/
{
int result;
BOOL destroyIt = PTW32_FALSE;
ptw32_thread_t * tp = (ptw32_thread_t *) thread.p;
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire(&ptw32_thread_reuse_lock, &node);
if (NULL == tp
|| thread.x != tp->ptHandle.x)
{
result = ESRCH;
}
else if (PTHREAD_CREATE_DETACHED == tp->detachState)
{
result = EINVAL;
}
else
{
ptw32_mcs_local_node_t stateLock;
/*
* Joinable ptw32_thread_t structs are not scavenged until
* a join or detach is done. The thread may have exited already,
* but all of the state and locks etc are still there.
*/
result = 0;
ptw32_mcs_lock_acquire (&tp->stateLock, &stateLock);
if (tp->state != PThreadStateLast)
{
tp->detachState = PTHREAD_CREATE_DETACHED;
}
else if (tp->detachState != PTHREAD_CREATE_DETACHED)
{
/*
* Thread is joinable and has exited or is exiting.
*/
destroyIt = PTW32_TRUE;
}
ptw32_mcs_lock_release (&stateLock);
}
ptw32_mcs_lock_release(&node);
if (result == 0)
{
/* Thread is joinable */
if (destroyIt)
{
/* The thread has exited or is exiting but has not been joined or
* detached. Need to wait in case it's still exiting.
*/
(void) WaitForSingleObject(tp->threadH, INFINITE);
ptw32_threadDestroy (thread);
}
}
return (result);
} /* pthread_detach */