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/*
* ptw32_threadReuse.c
*
* Description:
* This translation unit implements miscellaneous thread functions.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2002 Pthreads-win32 contributors
*
* Contact Email: rpj@ise.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"
/*
* The thread reuse stack is a simple LIFO stack managed through a singly
* linked list element in the pthread_t struct.
*
* All thread structs on the stack are clean and ready for reuse.
*
* The pthread_t_ struct's prevReuse element can be tested to check for an invalid
* thread ID. A NULL value indicates a valid thread. Applications should use the
* pthread_kill() function with a zero signal value to test for a valid thread ID.
*/
/*
* Pop a clean pthread_t struct off the reuse stack.
*/
pthread_t
ptw32_threadReusePop (void)
{
pthread_t t;
EnterCriticalSection(&ptw32_thread_reuse_lock);
t = ptw32_threadReuseTop;
if (PTW32_THREAD_REUSE_BOTTOM != t)
{
ptw32_threadReuseTop = t->prevReuse;
t->prevReuse = NULL;
}
else
{
t = NULL;
}
LeaveCriticalSection(&ptw32_thread_reuse_lock);
return t;
}
/*
* Push a clean pthread_t struct onto the reuse stack.
*/
void
ptw32_threadReusePush (pthread_t thread)
{
EnterCriticalSection(&ptw32_thread_reuse_lock);
memset(thread, 0, sizeof (*thread));
thread->prevReuse = ptw32_threadReuseTop;
ptw32_threadReuseTop = thread;
LeaveCriticalSection(&ptw32_thread_reuse_lock);
}
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