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|
/*
* pthread_mutex_timedlock.c
*
* Description:
* This translation unit implements mutual exclusion (mutex) primitives.
*
* --------------------------------------------------------------------------
*
* 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"
static INLINE int
ptw32_timed_eventwait (HANDLE event, const struct timespec *abstime)
/*
* ------------------------------------------------------
* DESCRIPTION
* This function waits on an event until signaled or until
* abstime passes.
* If abstime has passed when this routine is called then
* it returns a result to indicate this.
*
* If 'abstime' is a NULL pointer then this function will
* block until it can successfully decrease the value or
* until interrupted by a signal.
*
* This routine is not a cancelation point.
*
* RESULTS
* 0 successfully signaled,
* ETIMEDOUT abstime passed
* EINVAL 'event' is not a valid event,
*
* ------------------------------------------------------
*/
{
DWORD milliseconds;
DWORD status;
if (event == NULL)
{
return EINVAL;
}
else
{
if (abstime == NULL)
{
milliseconds = INFINITE;
}
else
{
/*
* Calculate timeout as milliseconds from current system time.
*/
milliseconds = ptw32_relmillisecs (abstime);
}
status = WaitForSingleObject (event, milliseconds);
if (status == WAIT_OBJECT_0)
{
return 0;
}
else if (status == WAIT_TIMEOUT)
{
return ETIMEDOUT;
}
else
{
return EINVAL;
}
}
return 0;
} /* ptw32_timed_semwait */
int
pthread_mutex_timedlock (pthread_mutex_t * mutex,
const struct timespec *abstime)
{
int result;
pthread_mutex_t mx;
/*
* Let the system deal with invalid pointers.
*/
/*
* We do a quick check to see if we need to do more work
* to initialise a static mutex. We check
* again inside the guarded section of ptw32_mutex_check_need_init()
* to avoid race conditions.
*/
if (*mutex >= PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
{
if ((result = ptw32_mutex_check_need_init (mutex)) != 0)
{
return (result);
}
}
mx = *mutex;
if (mx->kind == PTHREAD_MUTEX_NORMAL)
{
if ((LONG) PTW32_INTERLOCKED_EXCHANGE(
(LPLONG) &mx->lock_idx,
(LONG) 1) != 0)
{
while ((LONG) PTW32_INTERLOCKED_EXCHANGE(
(LPLONG) &mx->lock_idx,
(LONG) -1) != 0)
{
if (0 != (result = ptw32_timed_eventwait (mx->event, abstime)))
{
return result;
}
}
}
}
else
{
pthread_t self = pthread_self();
if ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_COMPARE_EXCHANGE(
(PTW32_INTERLOCKED_LPLONG) &mx->lock_idx,
(PTW32_INTERLOCKED_LONG) 1,
(PTW32_INTERLOCKED_LONG) 0) == 0)
{
mx->recursive_count = 1;
mx->ownerThread = self;
}
else
{
if (pthread_equal (mx->ownerThread, self))
{
if (mx->kind == PTHREAD_MUTEX_RECURSIVE)
{
mx->recursive_count++;
}
else
{
return EDEADLK;
}
}
else
{
while ((LONG) PTW32_INTERLOCKED_EXCHANGE(
(LPLONG) &mx->lock_idx,
(LONG) -1) != 0)
{
if (0 != (result = ptw32_timed_eventwait (mx->event, abstime)))
{
return result;
}
}
mx->recursive_count = 1;
mx->ownerThread = self;
}
}
}
return 0;
}
|
