mirror of https://github.com/PCSX2/pcsx2.git
162 lines
4.4 KiB
C
162 lines
4.4 KiB
C
/*
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* w32_CancelableWait.c
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*
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* Description:
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* This translation unit implements miscellaneous thread functions.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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static INLINE int
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ptw32_cancelable_wait (HANDLE waitHandle, DWORD timeout)
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/*
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* -------------------------------------------------------------------
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* This provides an extra hook into the pthread_cancel
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* mechanism that will allow you to wait on a Windows handle and make it a
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* cancellation point. This function blocks until the given WIN32 handle is
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* signaled or pthread_cancel has been called. It is implemented using
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* WaitForMultipleObjects on 'waitHandle' and a manually reset WIN32
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* event used to implement pthread_cancel.
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*
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* Given this hook it would be possible to implement more of the cancellation
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* points.
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* -------------------------------------------------------------------
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*/
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{
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int result;
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pthread_t self;
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ptw32_thread_t * sp;
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HANDLE handles[2];
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DWORD nHandles = 1;
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DWORD status;
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handles[0] = waitHandle;
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self = pthread_self();
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sp = (ptw32_thread_t *) self.p;
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if (sp != NULL)
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{
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/*
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* Get cancelEvent handle
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*/
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if (sp->cancelState == PTHREAD_CANCEL_ENABLE)
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{
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if ((handles[1] = sp->cancelEvent) != NULL)
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{
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nHandles++;
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}
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}
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}
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else
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{
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handles[1] = NULL;
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}
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status = WaitForMultipleObjects (nHandles, handles, PTW32_FALSE, timeout);
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switch (status - WAIT_OBJECT_0)
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{
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case 0:
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/*
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* Got the handle.
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* In the event that both handles are signalled, the smallest index
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* value (us) is returned. As it has been arranged, this ensures that
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* we don't drop a signal that we should act on (i.e. semaphore,
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* mutex, or condition variable etc).
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*/
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result = 0;
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break;
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case 1:
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/*
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* Got cancel request.
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* In the event that both handles are signaled, the cancel will
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* be ignored (see case 0 comment).
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*/
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ResetEvent (handles[1]);
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if (sp != NULL)
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{
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ptw32_mcs_local_node_t stateLock;
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/*
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* Should handle POSIX and implicit POSIX threads..
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* Make sure we haven't been async-canceled in the meantime.
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*/
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ptw32_mcs_lock_acquire (&sp->stateLock, &stateLock);
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if (sp->state < PThreadStateCanceling)
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{
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sp->state = PThreadStateCanceling;
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sp->cancelState = PTHREAD_CANCEL_DISABLE;
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ptw32_mcs_lock_release (&stateLock);
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ptw32_throw (PTW32_EPS_CANCEL);
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/* Never reached */
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}
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ptw32_mcs_lock_release (&stateLock);
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}
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/* Should never get to here. */
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result = EINVAL;
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break;
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default:
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if (status == WAIT_TIMEOUT)
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{
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result = ETIMEDOUT;
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}
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else
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{
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result = EINVAL;
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}
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break;
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}
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return (result);
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} /* CancelableWait */
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int
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pthreadCancelableWait (HANDLE waitHandle)
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{
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return (ptw32_cancelable_wait (waitHandle, INFINITE));
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}
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int
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pthreadCancelableTimedWait (HANDLE waitHandle, DWORD timeout)
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{
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return (ptw32_cancelable_wait (waitHandle, timeout));
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}
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