source: vscpl/src/hu/varadiistvan/scpl/_win32/CondVar.cc

Last change on this file was 5:55892b4e7748, checked in by István Váradi <ivaradi@…>, 12 years ago

Imported the conditional variable implementation from xplcommon

File size: 3.0 KB
Line 
1// Copyright (c) 2013 by István Váradi
2
3// This file is part of VSCPL, a simple cross-platform utility library
4
5// Redistribution and use in source and binary forms, with or without
6// modification, are permitted provided that the following conditions are met:
7
8// 1. Redistributions of source code must retain the above copyright notice, this
9// list of conditions and the following disclaimer.
10// 2. Redistributions in binary form must reproduce the above copyright notice,
11// this list of conditions and the following disclaimer in the documentation
12// and/or other materials provided with the distribution.
13
14// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
15// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
18// ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
23// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24
25// The views and conclusions contained in the software and documentation are those
26// of the authors and should not be interpreted as representing official policies,
27// either expressed or implied, of the FreeBSD Project.
28
29//------------------------------------------------------------------------------
30
31#include "CondVar.h"
32
33//------------------------------------------------------------------------------
34
35using hu::varadiistvan::scpl::CondVar;
36
37//------------------------------------------------------------------------------
38
39bool CondVar::wait(Mutex& inMutex, int timeout)
40{
41 mutex.lock();
42 ++numWaiters;
43 size_t generation = waitGeneration;
44 mutex.unlock();
45
46 inMutex.unlock();
47
48 bool lastWaiter = false;
49 bool wokenUp = false;
50 bool waitDone = false;
51 while (!waitDone) {
52 int result = WaitForSingleObject(event,
53 (timeout<0) ? INFINITE : timeout);
54 if (result==WAIT_OBJECT_0) {
55 mutex.lock();
56 waitDone = numToRelease>0 && generation!=waitGeneration;
57 if (waitDone) {
58 --numToRelease;
59 lastWaiter = numToRelease == 0;
60 wokenUp = true;
61 }
62 mutex.unlock();
63 } else {
64 waitDone = true;
65 }
66 }
67
68 inMutex.lock();
69
70 mutex.lock();
71 --numWaiters;
72 mutex.unlock();
73
74 if (lastWaiter) {
75 ResetEvent(event);
76 }
77
78 return wokenUp;
79}
80
81//------------------------------------------------------------------------------
82
83// Local Variables:
84// mode: C++
85// c-basic-offset: 4
86// indent-tabs-mode: nil
87// End:
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