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Source at commit 1322 created 9 years 5 months ago.
By meklort, Add doxygen to utils folder
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41
42#include <windows.h>
43#include "qwaitcondition.h"
44#include "qmutex.h"
45#include "qlist.h"
46
47//***********************************************************************
48// QWaitConditionPrivate
49// **********************************************************************
50
51class QWaitConditionEvent
52{
53public:
54 QWaitConditionEvent() : priority(0), wokenUp(false)
55 {
56 event = CreateEvent(NULL, TRUE, FALSE, NULL);
57 }
58 ~QWaitConditionEvent() { CloseHandle(event); }
59 int priority;
60 bool wokenUp;
61 HANDLE event;
62};
63
64class EventQueue : public QList<QWaitConditionEvent>
65{
66 public:
67 EventQueue() { setAutoDelete(TRUE); }
68 ~EventQueue() {}
69};
70
71class QWaitConditionPrivate
72{
73public:
74 QMutex mtx;
75 EventQueue queue;
76 EventQueue freeQueue;
77
78 QWaitConditionEvent *pre();
79 void wait(QWaitConditionEvent *wce);
80 void post(QWaitConditionEvent *wce);
81};
82
83QWaitConditionEvent *QWaitConditionPrivate::pre()
84{
85 mtx.lock();
86 QWaitConditionEvent *wce =
87 freeQueue.isEmpty() ? new QWaitConditionEvent : freeQueue.take(0);
88 wce->priority = GetThreadPriority(GetCurrentThread());
89 wce->wokenUp = FALSE;
90
91 // insert 'wce' into the queue (sorted by priority)
92 uint index = 0;
93 for (; index < queue.count(); ++index)
94 {
95 QWaitConditionEvent *current = queue.at(index);
96 if (current->priority < wce->priority)
97 break;
98 }
99 queue.insert(index, wce);
100 mtx.unlock();
101
102 return wce;
103}
104
105void QWaitConditionPrivate::wait(QWaitConditionEvent *wce)
106{
107 WaitForSingleObject(wce->event, INFINITE);
108}
109
110void QWaitConditionPrivate::post(QWaitConditionEvent *wce)
111{
112 mtx.lock();
113
114 // remove 'wce' from the queue
115 int idx = queue.find(wce);
116 ASSERT(idx!=-1);
117 queue.take(idx);
118 ResetEvent(wce->event);
119 freeQueue.append(wce);
120
121 // wakeups delivered after the timeout should be forwarded to the next waiter
122 if (wce->wokenUp && !queue.isEmpty())
123 {
124 QWaitConditionEvent *other = queue.getFirst();
125 SetEvent(other->event);
126 other->wokenUp = TRUE;
127 }
128
129 mtx.unlock();
130}
131
132//***********************************************************************
133// QWaitCondition implementation
134//***********************************************************************
135
136QWaitCondition::QWaitCondition()
137{
138 d = new QWaitConditionPrivate;
139}
140
141QWaitCondition::~QWaitCondition()
142{
143 if (!d->queue.isEmpty())
144 {
145 qWarning("QWaitCondition: Destroyed while threads are still waiting");
146 }
147 delete d;
148}
149
150void QWaitCondition::wait(QMutex *mutex)
151{
152 if (!mutex) return;
153
154 QWaitConditionEvent *wce = d->pre();
155 mutex->unlock();
156 d->wait(wce);
157 mutex->lock();
158 d->post(wce);
159}
160
161void QWaitCondition::wakeOne()
162{
163 // wake up the first waiting thread in the queue
164 QMutexLocker locker(&d->mtx);
165 for (uint i = 0; i < d->queue.count(); ++i)
166 {
167 QWaitConditionEvent *current = d->queue.at(i);
168 if (current->wokenUp) continue;
169 SetEvent(current->event);
170 current->wokenUp = TRUE;
171 break;
172 }
173}
174
175void QWaitCondition::wakeAll()
176{
177 // wake up the all threads in the queue
178 QMutexLocker locker(&d->mtx);
179 for (uint i = 0; i < d->queue.count(); ++i)
180 {
181 QWaitConditionEvent *current = d->queue.at(i);
182 SetEvent(current->event);
183 current->wokenUp = TRUE;
184 }
185}
186
187

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