161 lines
4.4 KiB
C
161 lines
4.4 KiB
C
/*
|
|
* w32_CancelableWait.c
|
|
*
|
|
* Description:
|
|
* This translation unit implements miscellaneous thread functions.
|
|
*
|
|
* --------------------------------------------------------------------------
|
|
*
|
|
* Pthreads-win32 - POSIX Threads Library for Win32
|
|
* Copyright(C) 1998 John E. Bossom
|
|
* Copyright(C) 1999,2005 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.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
|
|
*/
|
|
|
|
#include "pthread.h"
|
|
#include "implement.h"
|
|
|
|
|
|
static INLINE int
|
|
ptw32_cancelable_wait (HANDLE waitHandle, DWORD timeout)
|
|
/*
|
|
* -------------------------------------------------------------------
|
|
* This provides an extra hook into the pthread_cancel
|
|
* mechanism that will allow you to wait on a Windows handle and make it a
|
|
* cancellation point. This function blocks until the given WIN32 handle is
|
|
* signaled or pthread_cancel has been called. It is implemented using
|
|
* WaitForMultipleObjects on 'waitHandle' and a manually reset WIN32
|
|
* event used to implement pthread_cancel.
|
|
*
|
|
* Given this hook it would be possible to implement more of the cancellation
|
|
* points.
|
|
* -------------------------------------------------------------------
|
|
*/
|
|
{
|
|
int result;
|
|
pthread_t self;
|
|
ptw32_thread_t * sp;
|
|
HANDLE handles[2];
|
|
DWORD nHandles = 1;
|
|
DWORD status;
|
|
|
|
handles[0] = waitHandle;
|
|
|
|
self = pthread_self();
|
|
sp = (ptw32_thread_t *) self.p;
|
|
|
|
if (sp != NULL)
|
|
{
|
|
/*
|
|
* Get cancelEvent handle
|
|
*/
|
|
if (sp->cancelState == PTHREAD_CANCEL_ENABLE)
|
|
{
|
|
|
|
if ((handles[1] = sp->cancelEvent) != NULL)
|
|
{
|
|
nHandles++;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
handles[1] = NULL;
|
|
}
|
|
|
|
status = WaitForMultipleObjects (nHandles, handles, PTW32_FALSE, timeout);
|
|
|
|
switch (status - WAIT_OBJECT_0)
|
|
{
|
|
case 0:
|
|
/*
|
|
* Got the handle.
|
|
* In the event that both handles are signalled, the smallest index
|
|
* value (us) is returned. As it has been arranged, this ensures that
|
|
* we don't drop a signal that we should act on (i.e. semaphore,
|
|
* mutex, or condition variable etc).
|
|
*/
|
|
result = 0;
|
|
break;
|
|
|
|
case 1:
|
|
/*
|
|
* Got cancel request.
|
|
* In the event that both handles are signaled, the cancel will
|
|
* be ignored (see case 0 comment).
|
|
*/
|
|
ResetEvent (handles[1]);
|
|
|
|
if (sp != NULL)
|
|
{
|
|
ptw32_mcs_local_node_t stateLock;
|
|
/*
|
|
* Should handle POSIX and implicit POSIX threads..
|
|
* Make sure we haven't been async-canceled in the meantime.
|
|
*/
|
|
ptw32_mcs_lock_acquire (&sp->stateLock, &stateLock);
|
|
if (sp->state < PThreadStateCanceling)
|
|
{
|
|
sp->state = PThreadStateCanceling;
|
|
sp->cancelState = PTHREAD_CANCEL_DISABLE;
|
|
ptw32_mcs_lock_release (&stateLock);
|
|
ptw32_throw (PTW32_EPS_CANCEL);
|
|
|
|
/* Never reached */
|
|
}
|
|
ptw32_mcs_lock_release (&stateLock);
|
|
}
|
|
|
|
/* Should never get to here. */
|
|
result = EINVAL;
|
|
break;
|
|
|
|
default:
|
|
if (status == WAIT_TIMEOUT)
|
|
{
|
|
result = ETIMEDOUT;
|
|
}
|
|
else
|
|
{
|
|
result = EINVAL;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return (result);
|
|
|
|
} /* CancelableWait */
|
|
|
|
int
|
|
pthreadCancelableWait (HANDLE waitHandle)
|
|
{
|
|
return (ptw32_cancelable_wait (waitHandle, INFINITE));
|
|
}
|
|
|
|
int
|
|
pthreadCancelableTimedWait (HANDLE waitHandle, DWORD timeout)
|
|
{
|
|
return (ptw32_cancelable_wait (waitHandle, timeout));
|
|
}
|