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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 | |
60 | QT_BEGIN_NAMESPACE |
61 | |
62 | #define SLEEPMIN 10 |
63 | #define SLEEPMAX 500 |
64 | |
65 | class QIncrementalSleepTimer |
66 | { |
67 | |
68 | public: |
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 | |
104 | private: |
105 | QElapsedTimer timer; |
106 | int totalTimeOut; |
107 | int nextSleep; |
108 | }; |
109 | |
110 | class Q_CORE_EXPORT QWindowsPipeWriter : public QObject |
111 | { |
112 | Q_OBJECT |
113 | public: |
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 | |
123 | Q_SIGNALS: |
124 | void canWrite(); |
125 | void bytesWritten(qint64 bytes); |
126 | void _q_queueBytesWritten(QPrivateSignal); |
127 | |
128 | private: |
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 | |
156 | QT_END_NAMESPACE |
157 | |
158 | #endif // QWINDOWSPIPEWRITER_P_H |
159 |
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