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39
40#ifndef QWINDOWSPIPEWRITER_P_H
41#define QWINDOWSPIPEWRITER_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists purely as an
48// implementation detail. This header file may change from version to
49// version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtCore/private/qglobal_p.h>
55#include <qelapsedtimer.h>
56#include <qobject.h>
57#include <qbytearray.h>
58#include <qt_windows.h>
59
60QT_BEGIN_NAMESPACE
61
62#define SLEEPMIN 10
63#define SLEEPMAX 500
64
65class QIncrementalSleepTimer
66{
67
68public:
69 QIncrementalSleepTimer(int msecs)
70 : totalTimeOut(msecs)
71 , nextSleep(qMin(SLEEPMIN, totalTimeOut))
72 {
73 if (totalTimeOut == -1)
74 nextSleep = SLEEPMIN;
75 timer.start();
76 }
77
78 int nextSleepTime()
79 {
80 int tmp = nextSleep;
81 nextSleep = qMin(nextSleep * 2, qMin(SLEEPMAX, timeLeft()));
82 return tmp;
83 }
84
85 int timeLeft() const
86 {
87 if (totalTimeOut == -1)
88 return SLEEPMAX;
89 return qMax(int(totalTimeOut - timer.elapsed()), 0);
90 }
91
92 bool hasTimedOut() const
93 {
94 if (totalTimeOut == -1)
95 return false;
96 return timer.elapsed() >= totalTimeOut;
97 }
98
99 void resetIncrements()
100 {
101 nextSleep = qMin(SLEEPMIN, timeLeft());
102 }
103
104private:
105 QElapsedTimer timer;
106 int totalTimeOut;
107 int nextSleep;
108};
109
110class Q_CORE_EXPORT QWindowsPipeWriter : public QObject
111{
112 Q_OBJECT
113public:
114 explicit QWindowsPipeWriter(HANDLE pipeWriteEnd, QObject *parent = 0);
115 ~QWindowsPipeWriter();
116
117 bool write(const QByteArray &ba);
118 void stop();
119 bool waitForWrite(int msecs);
120 bool isWriteOperationActive() const { return writeSequenceStarted; }
121 qint64 bytesToWrite() const;
122
123Q_SIGNALS:
124 void canWrite();
125 void bytesWritten(qint64 bytes);
126 void _q_queueBytesWritten(QPrivateSignal);
127
128private:
129 static void CALLBACK writeFileCompleted(DWORD errorCode, DWORD numberOfBytesTransfered,
130 OVERLAPPED *overlappedBase);
131 void notified(DWORD errorCode, DWORD numberOfBytesWritten);
132 bool waitForNotification(int timeout);
133 void emitPendingBytesWrittenValue();
134
135 class Overlapped : public OVERLAPPED
136 {
137 Q_DISABLE_COPY_MOVE(Overlapped)
138 public:
139 explicit Overlapped(QWindowsPipeWriter *pipeWriter);
140 void clear();
141
142 QWindowsPipeWriter *pipeWriter;
143 };
144
145 HANDLE handle;
146 Overlapped *overlapped;
147 QByteArray buffer;
148 qint64 pendingBytesWrittenValue;
149 bool stopped;
150 bool writeSequenceStarted;
151 bool notifiedCalled;
152 bool bytesWrittenPending;
153 bool inBytesWritten;
154};
155
156QT_END_NAMESPACE
157
158#endif // QWINDOWSPIPEWRITER_P_H
159

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