QAbstractSocketEngine: port to QDeadlineTimer

qnativesocketengine_win.cpp: don't check if timeout is < 0, because
remainingTimeAsDuration() doesn't return negative values.

All the changes done in one go, not function by function, as that causes
the least churn. You can think of them as a couple of very similar
changes repeated various times.

Drive-by change: replace `forever {` with `for (;;)`

Task-number: QTBUG-113518
Change-Id: Ie9f20031bf0d4ff19e5b2da5034822ba61f9cbc3
Reviewed-by: Qt CI Bot <[email protected]>
Reviewed-by: Mårten Nordheim <[email protected]>

16 files changed, 146 insertions, 130 deletions

diff --git a/src/network/socket/qabstractsocket.cpp b/src/network/socket/qabstractsocket.cpp
index 0768b1ff7cd..e74f448987f 100644
--- a/src/network/socket/qabstractsocket.cpp
+++ b/src/network/socket/qabstractsocket.cpp
@@ -439,7 +439,7 @@
 #include <qmetaobject.h>
 #include <qpointer.h>
 #include <qtimer.h>
-#include <qelapsedtimer.h>
+#include <qdeadlinetimer.h>
 #include <qscopedvaluerollback.h>
 #include <qvarlengtharray.h>
 
@@ -465,11 +465,12 @@
 QT_BEGIN_NAMESPACE
 
 using namespace Qt::StringLiterals;
+using namespace std::chrono_literals;
 
 QT_IMPL_METATYPE_EXTERN_TAGGED(QAbstractSocket::SocketState, QAbstractSocket__SocketState)
 QT_IMPL_METATYPE_EXTERN_TAGGED(QAbstractSocket::SocketError, QAbstractSocket__SocketError)
 
-static const int DefaultConnectTimeout = 30000;
+static constexpr auto DefaultConnectTimeout = 30s;
 
 static bool isProxyError(QAbstractSocket::SocketError error)
 {
@@ -2051,8 +2052,7 @@ bool QAbstractSocket::waitForConnected(int msecs)
 
     bool wasPendingClose = d->pendingClose;
     d->pendingClose = false;
-    QElapsedTimer stopWatch;
-    stopWatch.start();
+    QDeadlineTimer deadline{msecs};
 
     if (d->state == HostLookupState) {
 #if defined (QABSTRACTSOCKET_DEBUG)
@@ -2076,17 +2076,17 @@ bool QAbstractSocket::waitForConnected(int msecs)
 #if defined (QABSTRACTSOCKET_DEBUG)
     int attempt = 1;
 #endif
-    while (state() == ConnectingState && (msecs == -1 || stopWatch.elapsed() < msecs)) {
-        int timeout = qt_subtract_from_timeout(msecs, stopWatch.elapsed());
-        if (msecs != -1 && timeout > DefaultConnectTimeout)
-            timeout = DefaultConnectTimeout;
+    while (state() == ConnectingState && !deadline.hasExpired()) {
+        QDeadlineTimer timer = deadline;
+        if (!deadline.isForever() && deadline.remainingTimeAsDuration() > DefaultConnectTimeout)
+            timer = QDeadlineTimer(DefaultConnectTimeout);
 #if defined (QABSTRACTSOCKET_DEBUG)
         qDebug("QAbstractSocket::waitForConnected(%i) waiting %.2f secs for connection attempt #%i",
-               msecs, timeout / 1000.0, attempt++);
+               msecs, timer.remainingTime() / 1000.0, attempt++);
 #endif
         timedOut = false;
 
-        if (d->socketEngine && d->socketEngine->waitForWrite(timeout, &timedOut) && !timedOut) {
+        if (d->socketEngine && d->socketEngine->waitForWrite(timer, &timedOut) && !timedOut) {
             d->_q_testConnection();
         } else {
             d->_q_connectToNextAddress();
@@ -2141,8 +2141,7 @@ bool QAbstractSocket::waitForReadyRead(int msecs)
         return false;
     }
 
-    QElapsedTimer stopWatch;
-    stopWatch.start();
+    QDeadlineTimer deadline{msecs};
 
     // handle a socket in connecting state
     if (state() == HostLookupState || state() == ConnectingState) {
@@ -2158,7 +2157,7 @@ bool QAbstractSocket::waitForReadyRead(int msecs)
         bool readyToRead = false;
         bool readyToWrite = false;
         if (!d->socketEngine->waitForReadOrWrite(&readyToRead, &readyToWrite, true, !d->writeBuffer.isEmpty(),
-                                               qt_subtract_from_timeout(msecs, stopWatch.elapsed()))) {
+                                                 deadline)) {
 #if defined (QABSTRACTSOCKET_DEBUG)
             qDebug("QAbstractSocket::waitForReadyRead(%i) failed (%i, %s)",
                    msecs, d->socketEngine->error(), d->socketEngine->errorString().toLatin1().constData());
@@ -2176,7 +2175,7 @@ bool QAbstractSocket::waitForReadyRead(int msecs)
 
         if (readyToWrite)
             d->canWriteNotification();
-    } while (msecs == -1 || qt_subtract_from_timeout(msecs, stopWatch.elapsed()) > 0);
+    } while (!deadline.hasExpired());
     return false;
 }
 
@@ -2212,8 +2211,7 @@ bool QAbstractSocket::waitForBytesWritten(int msecs)
     if (d->writeBuffer.isEmpty())
         return false;
 
-    QElapsedTimer stopWatch;
-    stopWatch.start();
+    QDeadlineTimer deadline{msecs};
 
     // handle a socket in connecting state
     if (state() == HostLookupState || state() == ConnectingState) {
@@ -2221,13 +2219,13 @@ bool QAbstractSocket::waitForBytesWritten(int msecs)
             return false;
     }
 
-    forever {
+    for (;;) {
         bool readyToRead = false;
         bool readyToWrite = false;
         if (!d->socketEngine->waitForReadOrWrite(&readyToRead, &readyToWrite,
                                   !d->readBufferMaxSize || d->buffer.size() < d->readBufferMaxSize,
                                   !d->writeBuffer.isEmpty(),
-                                  qt_subtract_from_timeout(msecs, stopWatch.elapsed()))) {
+                                  deadline)) {
 #if defined (QABSTRACTSOCKET_DEBUG)
             qDebug("QAbstractSocket::waitForBytesWritten(%i) failed (%i, %s)",
                    msecs, d->socketEngine->error(), d->socketEngine->errorString().toLatin1().constData());
@@ -2291,8 +2289,7 @@ bool QAbstractSocket::waitForDisconnected(int msecs)
         return false;
     }
 
-    QElapsedTimer stopWatch;
-    stopWatch.start();
+    QDeadlineTimer deadline{msecs};
 
     // handle a socket in connecting state
     if (state() == HostLookupState || state() == ConnectingState) {
@@ -2302,12 +2299,12 @@ bool QAbstractSocket::waitForDisconnected(int msecs)
             return true;
     }
 
-    forever {
+    for (;;) {
         bool readyToRead = false;
         bool readyToWrite = false;
         if (!d->socketEngine->waitForReadOrWrite(&readyToRead, &readyToWrite, state() == ConnectedState,
                                                !d->writeBuffer.isEmpty(),
-                                               qt_subtract_from_timeout(msecs, stopWatch.elapsed()))) {
+                                               deadline)) {
 #if defined (QABSTRACTSOCKET_DEBUG)
             qDebug("QAbstractSocket::waitForReadyRead(%i) failed (%i, %s)",
                    msecs, d->socketEngine->error(), d->socketEngine->errorString().toLatin1().constData());
diff --git a/src/network/socket/qabstractsocketengine_p.h b/src/network/socket/qabstractsocketengine_p.h
index 7b1ec858020..9ee79cebc18 100644
--- a/src/network/socket/qabstractsocketengine_p.h
+++ b/src/network/socket/qabstractsocketengine_p.h
@@ -19,8 +19,9 @@
 #include <QtNetwork/private/qtnetworkglobal_p.h>
 #include "QtNetwork/qhostaddress.h"
 #include "QtNetwork/qabstractsocket.h"
-#include "private/qobject_p.h"
+#include <QtCore/qdeadlinetimer.h>
 #include "private/qnetworkdatagram_p.h"
+#include "private/qobject_p.h"
 
 QT_BEGIN_NAMESPACE
 
@@ -44,6 +45,8 @@ public:
 #endif
 };
 
+static constexpr std::chrono::seconds DefaultTimeout{30};
+
 class Q_AUTOTEST_EXPORT QAbstractSocketEngine : public QObject
 {
     Q_OBJECT
@@ -128,11 +131,14 @@ public:
     virtual int option(SocketOption option) const = 0;
     virtual bool setOption(SocketOption option, int value) = 0;
 
-    virtual bool waitForRead(int msecs = 30000, bool *timedOut = nullptr) = 0;
-    virtual bool waitForWrite(int msecs = 30000, bool *timedOut = nullptr) = 0;
+    virtual bool waitForRead(QDeadlineTimer deadline = QDeadlineTimer{DefaultTimeout},
+                             bool *timedOut = nullptr) = 0;
+    virtual bool waitForWrite(QDeadlineTimer deadline = QDeadlineTimer{DefaultTimeout},
+                              bool *timedOut = nullptr) = 0;
     virtual bool waitForReadOrWrite(bool *readyToRead, bool *readyToWrite,
                             bool checkRead, bool checkWrite,
-                            int msecs = 30000, bool *timedOut = nullptr) = 0;
+                            QDeadlineTimer deadline = QDeadlineTimer{DefaultTimeout},
+                            bool *timedOut = nullptr) = 0;
 
     QAbstractSocket::SocketError error() const;
     QString errorString() const;
diff --git a/src/network/socket/qhttpsocketengine.cpp b/src/network/socket/qhttpsocketengine.cpp
index ba24460066b..07d24dd91b9 100644
--- a/src/network/socket/qhttpsocketengine.cpp
+++ b/src/network/socket/qhttpsocketengine.cpp
@@ -7,7 +7,7 @@
 #include "qurl.h"
 #include "private/qhttpnetworkreply_p.h"
 #include "private/qiodevice_p.h"
-#include "qelapsedtimer.h"
+#include "qdeadlinetimer.h"
 #include "qnetworkinterface.h"
 
 #if !defined(QT_NO_NETWORKPROXY)
@@ -310,19 +310,16 @@ bool QHttpSocketEngine::setOption(SocketOption option, int value)
     return false;
 }
 
-bool QHttpSocketEngine::waitForRead(int msecs, bool *timedOut)
+bool QHttpSocketEngine::waitForRead(QDeadlineTimer deadline, bool *timedOut)
 {
     Q_D(const QHttpSocketEngine);
 
     if (!d->socket || d->socket->state() == QAbstractSocket::UnconnectedState)
         return false;
 
-    QElapsedTimer stopWatch;
-    stopWatch.start();
-
     // Wait for more data if nothing is available.
     if (!d->socket->bytesAvailable()) {
-        if (!d->socket->waitForReadyRead(qt_subtract_from_timeout(msecs, stopWatch.elapsed()))) {
+        if (!d->socket->waitForReadyRead(deadline.remainingTime())) {
             if (d->socket->state() == QAbstractSocket::UnconnectedState)
                 return true;
             setError(d->socket->error(), d->socket->errorString());
@@ -334,7 +331,7 @@ bool QHttpSocketEngine::waitForRead(int msecs, bool *timedOut)
 
     // If we're not connected yet, wait until we are, or until an error
     // occurs.
-    while (d->state != Connected && d->socket->waitForReadyRead(qt_subtract_from_timeout(msecs, stopWatch.elapsed()))) {
+    while (d->state != Connected && d->socket->waitForReadyRead(deadline.remainingTime())) {
         // Loop while the protocol handshake is taking place.
     }
 
@@ -348,14 +345,14 @@ bool QHttpSocketEngine::waitForRead(int msecs, bool *timedOut)
     return true;
 }
 
-bool QHttpSocketEngine::waitForWrite(int msecs, bool *timedOut)
+bool QHttpSocketEngine::waitForWrite(QDeadlineTimer deadline, bool *timedOut)
 {
     Q_D(const QHttpSocketEngine);
 
     // If we're connected, just forward the call.
     if (d->state == Connected) {
         if (d->socket->bytesToWrite()) {
-            if (!d->socket->waitForBytesWritten(msecs)) {
+            if (!d->socket->waitForBytesWritten(deadline.remainingTime())) {
                 if (d->socket->error() == QAbstractSocket::SocketTimeoutError && timedOut)
                     *timedOut = true;
                 return false;
@@ -364,13 +361,10 @@ bool QHttpSocketEngine::waitForWrite(int msecs, bool *timedOut)
         return true;
     }
 
-    QElapsedTimer stopWatch;
-    stopWatch.start();
-
     // If we're not connected yet, wait until we are, and until bytes have
     // been received (i.e., the socket has connected, we have sent the
     // greeting, and then received the response).
-    while (d->state != Connected && d->socket->waitForReadyRead(qt_subtract_from_timeout(msecs, stopWatch.elapsed()))) {
+    while (d->state != Connected && d->socket->waitForReadyRead(deadline.remainingTime())) {
         // Loop while the protocol handshake is taking place.
     }
 
@@ -386,20 +380,20 @@ bool QHttpSocketEngine::waitForWrite(int msecs, bool *timedOut)
 
 bool QHttpSocketEngine::waitForReadOrWrite(bool *readyToRead, bool *readyToWrite,
                                            bool checkRead, bool checkWrite,
-                                           int msecs, bool *timedOut)
+                                           QDeadlineTimer deadline, bool *timedOut)
 {
     Q_UNUSED(checkRead);
 
     if (!checkWrite) {
         // Not interested in writing? Then we wait for read notifications.
-        bool canRead = waitForRead(msecs, timedOut);
+        bool canRead = waitForRead(deadline, timedOut);
         if (readyToRead)
             *readyToRead = canRead;
         return canRead;
     }
 
     // Interested in writing? Then we wait for write notifications.
-    bool canWrite = waitForWrite(msecs, timedOut);
+    bool canWrite = waitForWrite(deadline, timedOut);
     if (readyToWrite)
         *readyToWrite = canWrite;
     return canWrite;
diff --git a/src/network/socket/qhttpsocketengine_p.h b/src/network/socket/qhttpsocketengine_p.h
index 242f11122fb..70ffd06b6ba 100644
--- a/src/network/socket/qhttpsocketengine_p.h
+++ b/src/network/socket/qhttpsocketengine_p.h
@@ -92,11 +92,14 @@ public:
     int option(SocketOption option) const override;
     bool setOption(SocketOption option, int value) override;
 
-    bool waitForRead(int msecs = 30000, bool *timedOut = nullptr) override;
-    bool waitForWrite(int msecs = 30000, bool *timedOut = nullptr) override;
+    bool waitForRead(QDeadlineTimer deadline = QDeadlineTimer{DefaultTimeout},
+                     bool *timedOut = nullptr) override;
+    bool waitForWrite(QDeadlineTimer deadline = QDeadlineTimer{DefaultTimeout},
+                      bool *timedOut = nullptr) override;
     bool waitForReadOrWrite(bool *readyToRead, bool *readyToWrite,
                             bool checkRead, bool checkWrite,
-                            int msecs = 30000, bool *timedOut = nullptr) override;
+                            QDeadlineTimer deadline = QDeadlineTimer{DefaultTimeout},
+                            bool *timedOut = nullptr) override;
 
     bool isReadNotificationEnabled() const override;
     void setReadNotificationEnabled(bool enable) override;
diff --git a/src/network/socket/qnativesocketengine.cpp b/src/network/socket/qnativesocketengine.cpp
index e2726be7817..6d0d22deadd 100644
--- a/src/network/socket/qnativesocketengine.cpp
+++ b/src/network/socket/qnativesocketengine.cpp
@@ -962,9 +962,9 @@ void QNativeSocketEngine::close()
 }
 
 /*!
-    Waits for \a msecs milliseconds or until the socket is ready for
-    reading. If \a timedOut is not \nullptr and \a msecs milliseconds
-    have passed, the value of \a timedOut is set to true.
+    Waits until \a deadline has expired or until the socket is ready for
+    reading. If \a timedOut is not \nullptr and \a deadline has expired,
+    the value of \a timedOut is set to true.
 
     Returns \c true if data is available for reading; otherwise returns
     false.
@@ -976,7 +976,7 @@ void QNativeSocketEngine::close()
     is to create a QSocketNotifier, passing the socket descriptor
     returned by socketDescriptor() to its constructor.
 */
-bool QNativeSocketEngine::waitForRead(int msecs, bool *timedOut)
+bool QNativeSocketEngine::waitForRead(QDeadlineTimer deadline, bool *timedOut)
 {
     Q_D(const QNativeSocketEngine);
     Q_CHECK_VALID_SOCKETLAYER(QNativeSocketEngine::waitForRead(), false);
@@ -986,7 +986,7 @@ bool QNativeSocketEngine::waitForRead(int msecs, bool *timedOut)
     if (timedOut)
         *timedOut = false;
 
-    int ret = d->nativeSelect(msecs, true);
+    int ret = d->nativeSelect(deadline, true);
     if (ret == 0) {
         if (timedOut)
             *timedOut = true;
@@ -1002,9 +1002,9 @@ bool QNativeSocketEngine::waitForRead(int msecs, bool *timedOut)
 }
 
 /*!
-    Waits for \a msecs milliseconds or until the socket is ready for
-    writing. If \a timedOut is not \nullptr and \a msecs milliseconds
-    have passed, the value of \a timedOut is set to true.
+    Waits until \a deadline has expired or until the socket is ready for
+    writing. If \a timedOut is not \nullptr and \a deadline has expired,
+    the value of \a timedOut is set to true.
 
     Returns \c true if data is available for writing; otherwise returns
     false.
@@ -1016,7 +1016,7 @@ bool QNativeSocketEngine::waitForRead(int msecs, bool *timedOut)
     is to create a QSocketNotifier, passing the socket descriptor
     returned by socketDescriptor() to its constructor.
 */
-bool QNativeSocketEngine::waitForWrite(int msecs, bool *timedOut)
+bool QNativeSocketEngine::waitForWrite(QDeadlineTimer deadline, bool *timedOut)
 {
     Q_D(QNativeSocketEngine);
     Q_CHECK_VALID_SOCKETLAYER(QNativeSocketEngine::waitForWrite(), false);
@@ -1026,7 +1026,7 @@ bool QNativeSocketEngine::waitForWrite(int msecs, bool *timedOut)
     if (timedOut)
         *timedOut = false;
 
-    int ret = d->nativeSelect(msecs, false);
+    int ret = d->nativeSelect(deadline, false);
     // On Windows, the socket is in connected state if a call to
     // select(writable) is successful. In this case we should not
     // issue a second call to WSAConnect()
@@ -1074,14 +1074,14 @@ bool QNativeSocketEngine::waitForWrite(int msecs, bool *timedOut)
 
 bool QNativeSocketEngine::waitForReadOrWrite(bool *readyToRead, bool *readyToWrite,
                                       bool checkRead, bool checkWrite,
-                                      int msecs, bool *timedOut)
+                                      QDeadlineTimer deadline, bool *timedOut)
 {
     Q_D(QNativeSocketEngine);
     Q_CHECK_VALID_SOCKETLAYER(QNativeSocketEngine::waitForReadOrWrite(), false);
     Q_CHECK_NOT_STATE(QNativeSocketEngine::waitForReadOrWrite(),
                       QAbstractSocket::UnconnectedState, false);
 
-    int ret = d->nativeSelect(msecs, checkRead, checkWrite, readyToRead, readyToWrite);
+    int ret = d->nativeSelect(deadline, checkRead, checkWrite, readyToRead, readyToWrite);
     // On Windows, the socket is in connected state if a call to
     // select(writable) is successful. In this case we should not
     // issue a second call to WSAConnect()
diff --git a/src/network/socket/qnativesocketengine_p.h b/src/network/socket/qnativesocketengine_p.h
index 4ee9764e425..4c185b7a4a1 100644
--- a/src/network/socket/qnativesocketengine_p.h
+++ b/src/network/socket/qnativesocketengine_p.h
@@ -154,11 +154,14 @@ public:
     int option(SocketOption option) const override;
     bool setOption(SocketOption option, int value) override;
 
-    bool waitForRead(int msecs = 30000, bool *timedOut = nullptr) override;
-    bool waitForWrite(int msecs = 30000, bool *timedOut = nullptr) override;
+    bool waitForRead(QDeadlineTimer deadline = QDeadlineTimer{DefaultTimeout},
+                     bool *timedOut = nullptr) override;
+    bool waitForWrite(QDeadlineTimer deadline = QDeadlineTimer{DefaultTimeout},
+                      bool *timedOut = nullptr) override;
     bool waitForReadOrWrite(bool *readyToRead, bool *readyToWrite,
                             bool checkRead, bool checkWrite,
-                            int msecs = 30000, bool *timedOut = nullptr) override;
+                            QDeadlineTimer deadline = QDeadlineTimer{DefaultTimeout},
+                            bool *timedOut = nullptr) override;
 
     bool isReadNotificationEnabled() const override;
     void setReadNotificationEnabled(bool enable) override;
diff --git a/src/network/socket/qnativesocketengine_p_p.h b/src/network/socket/qnativesocketengine_p_p.h
index d52a30b1534..189a4327fd3 100644
--- a/src/network/socket/qnativesocketengine_p_p.h
+++ b/src/network/socket/qnativesocketengine_p_p.h
@@ -146,8 +146,8 @@ public:
     qint64 nativeSendDatagram(const char *data, qint64 length, const QIpPacketHeader &header);
     qint64 nativeRead(char *data, qint64 maxLength);
     qint64 nativeWrite(const char *data, qint64 length);
-    int nativeSelect(int timeout, bool selectForRead) const;
-    int nativeSelect(int timeout, bool checkRead, bool checkWrite,
+    int nativeSelect(QDeadlineTimer deadline, bool selectForRead) const;
+    int nativeSelect(QDeadlineTimer deadline, bool checkRead, bool checkWrite,
                      bool *selectForRead, bool *selectForWrite) const;
 
     void nativeClose();
diff --git a/src/network/socket/qnativesocketengine_unix.cpp b/src/network/socket/qnativesocketengine_unix.cpp
index 023a0dbc2c1..87c74f7f854 100644
--- a/src/network/socket/qnativesocketengine_unix.cpp
+++ b/src/network/socket/qnativesocketengine_unix.cpp
@@ -5,9 +5,9 @@
 //#define QNATIVESOCKETENGINE_DEBUG
 #include "qnativesocketengine_p_p.h"
 #include "private/qnet_unix_p.h"
+#include "qdeadlinetimer.h"
 #include "qiodevice.h"
 #include "qhostaddress.h"
-#include "qelapsedtimer.h"
 #include "qvarlengtharray.h"
 #include "qnetworkinterface.h"
 #include "qendian.h"
@@ -1344,16 +1344,17 @@ qint64 QNativeSocketEnginePrivate::nativeRead(char *data, qint64 maxSize)
     return qint64(r);
 }
 
-int QNativeSocketEnginePrivate::nativeSelect(int timeout, bool selectForRead) const
+int QNativeSocketEnginePrivate::nativeSelect(QDeadlineTimer deadline, bool selectForRead) const
 {
     bool dummy;
-    return nativeSelect(timeout, selectForRead, !selectForRead, &dummy, &dummy);
+    return nativeSelect(deadline, selectForRead, !selectForRead, &dummy, &dummy);
 }
 
 #ifndef Q_OS_WASM
 
-int QNativeSocketEnginePrivate::nativeSelect(int timeout, bool checkRead, bool checkWrite,
-                       bool *selectForRead, bool *selectForWrite) const
+int QNativeSocketEnginePrivate::nativeSelect(QDeadlineTimer deadline, bool checkRead,
+                                             bool checkWrite, bool *selectForRead,
+                                             bool *selectForWrite) const
 {
     pollfd pfd = qt_make_pollfd(socketDescriptor, 0);
 
@@ -1363,7 +1364,7 @@ int QNativeSocketEnginePrivate::nativeSelect(int timeout, bool checkRead, bool c
     if (checkWrite)
         pfd.events |= POLLOUT;
 
-    const int ret = qt_poll_msecs(&pfd, 1, timeout);
+    const int ret = qt_poll_msecs(&pfd, 1, deadline.remainingTime());
 
     if (ret <= 0)
         return ret;
@@ -1384,13 +1385,16 @@ int QNativeSocketEnginePrivate::nativeSelect(int timeout, bool checkRead, bool c
 
 #else
 
-int QNativeSocketEnginePrivate::nativeSelect(int timeout, bool checkRead, bool checkWrite,
-                        bool *selectForRead, bool *selectForWrite) const
+int QNativeSocketEnginePrivate::nativeSelect(QDeadlineTimer deadline, bool checkRead,
+                                             bool checkWrite, bool *selectForRead,
+                                             bool *selectForWrite) const
 {
     *selectForRead = checkRead;
     *selectForWrite = checkWrite;
     bool socketDisconnect = false;
-    QEventDispatcherWasm::socketSelect(timeout, socketDescriptor, checkRead, checkWrite,selectForRead, selectForWrite, &socketDisconnect);
+    QEventDispatcherWasm::socketSelect(deadline.remainingTime(), socketDescriptor, checkRead,
+                                       checkWrite, selectForRead, selectForWrite,
+                                       &socketDisconnect);
 
     // The disconnect/close handling code in QAbstractsScket::canReadNotification()
     // does not detect remote disconnect properly; do that here as a workardound.
diff --git a/src/network/socket/qnativesocketengine_win.cpp b/src/network/socket/qnativesocketengine_win.cpp
index 16d974a68be..6525f46e308 100644
--- a/src/network/socket/qnativesocketengine_win.cpp
+++ b/src/network/socket/qnativesocketengine_win.cpp
@@ -16,6 +16,7 @@
 #include <qvarlengtharray.h>
 
 #include <algorithm>
+#include <chrono>
 
 //#define QNATIVESOCKETENGINE_DEBUG
 #if defined(QNATIVESOCKETENGINE_DEBUG)
@@ -1428,7 +1429,18 @@ qint64 QNativeSocketEnginePrivate::nativeRead(char *data, qint64 maxLength)
     return ret;
 }
 
-int QNativeSocketEnginePrivate::nativeSelect(int timeout, bool selectForRead) const
+inline timeval durationToTimeval(std::chrono::nanoseconds dur) noexcept
+{
+    using namespace std::chrono;
+    const auto secs = duration_cast<seconds>(dur);
+    const auto frac = duration_cast<microseconds>(dur - secs);
+    struct timeval tval;
+    tval.tv_sec = secs.count();
+    tval.tv_usec = frac.count();
+    return tval;
+}
+
+int QNativeSocketEnginePrivate::nativeSelect(QDeadlineTimer deadline, bool selectForRead) const
 {
     bool readEnabled = selectForRead && readNotifier && readNotifier->isEnabled();
     if (readEnabled)
@@ -1442,12 +1454,10 @@ int QNativeSocketEnginePrivate::nativeSelect(int timeout, bool selectForRead) co
     fds.fd_count = 1;
     fds.fd_array[0] = (SOCKET)socketDescriptor;
 
-    struct timeval tv;
-    tv.tv_sec = timeout / 1000;
-    tv.tv_usec = (timeout % 1000) * 1000;
+    struct timeval tv = durationToTimeval(deadline.remainingTimeAsDuration());
 
     if (selectForRead) {
-        ret = select(0, &fds, 0, 0, timeout < 0 ? 0 : &tv);
+        ret = select(0, &fds, 0, 0, &tv);
     } else {
         // select for write
 
@@ -1456,7 +1466,7 @@ int QNativeSocketEnginePrivate::nativeSelect(int timeout, bool selectForRead) co
         FD_ZERO(&fdexception);
         FD_SET((SOCKET)socketDescriptor, &fdexception);
 
-        ret = select(0, 0, &fds, &fdexception, timeout < 0 ? 0 : &tv);
+        ret = select(0, 0, &fds, &fdexception, &tv);
 
         // ... but if it is actually set, pretend it did not happen
         if (ret > 0 && FD_ISSET((SOCKET)socketDescriptor, &fdexception))
@@ -1469,7 +1479,7 @@ int QNativeSocketEnginePrivate::nativeSelect(int timeout, bool selectForRead) co
     return ret;
 }
 
-int QNativeSocketEnginePrivate::nativeSelect(int timeout,
+int QNativeSocketEnginePrivate::nativeSelect(QDeadlineTimer deadline,
                                       bool checkRead, bool checkWrite,
                                       bool *selectForRead, bool *selectForWrite) const
 {
@@ -1498,11 +1508,9 @@ int QNativeSocketEnginePrivate::nativeSelect(int timeout,
         FD_SET((SOCKET)socketDescriptor, &fdexception);
     }
 
-    struct timeval tv;
-    tv.tv_sec = timeout / 1000;
-    tv.tv_usec = (timeout % 1000) * 1000;
+    struct timeval tv = durationToTimeval(deadline.remainingTimeAsDuration());
 
-    ret = select(socketDescriptor + 1, &fdread, &fdwrite, &fdexception, timeout < 0 ? 0 : &tv);
+    ret = select(socketDescriptor + 1, &fdread, &fdwrite, &fdexception, &tv);
 
      //... but if it is actually set, pretend it did not happen
     if (ret > 0 && FD_ISSET((SOCKET)socketDescriptor, &fdexception))
diff --git a/src/network/socket/qsocks5socketengine.cpp b/src/network/socket/qsocks5socketengine.cpp
index a36b5d3b708..00f586562ce 100644
--- a/src/network/socket/qsocks5socketengine.cpp
+++ b/src/network/socket/qsocks5socketengine.cpp
@@ -9,6 +9,7 @@
 #include "qdebug.h"
 #include "qhash.h"
 #include "qqueue.h"
+#include "qdeadlinetimer.h"
 #include "qelapsedtimer.h"
 #include "qmutex.h"
 #include "qthread.h"
@@ -25,13 +26,14 @@
 QT_BEGIN_NAMESPACE
 
 using namespace Qt::StringLiterals;
+using namespace std::chrono_literals;
 
 static const int MaxWriteBufferSize = 128*1024;
 
 //#define QSOCKS5SOCKETLAYER_DEBUG
 
 #define MAX_DATA_DUMP 256
-#define SOCKS5_BLOCKING_BIND_TIMEOUT 5000
+static constexpr auto Socks5BlockingBindTimeout = 5s;
 
 #define Q_INIT_CHECK(returnValue) do { \
     if (!d->data) { \
@@ -318,7 +320,6 @@ void QSocks5BindStore::add(qintptr socketDescriptor, QSocks5BindData *bindData)
     bindData->timeStamp.start();
     store.insert(socketDescriptor, bindData);
 
-    using namespace std::chrono_literals;
     // start sweep timer if not started
     if (sweepTimerId == -1)
         sweepTimerId = startTimer(1min);
@@ -1327,11 +1328,8 @@ bool QSocks5SocketEngine::bind(const QHostAddress &addr, quint16 port)
         return false;
     }
 
-    int msecs = SOCKS5_BLOCKING_BIND_TIMEOUT;
-    QElapsedTimer stopWatch;
-    stopWatch.start();
     d->data->controlSocket->connectToHost(d->proxyInfo.hostName(), d->proxyInfo.port());
-    if (!d->waitForConnected(msecs, nullptr) ||
+    if (!d->waitForConnected(QDeadlineTimer{Socks5BlockingBindTimeout}, nullptr) ||
         d->data->controlSocket->state() == QAbstractSocket::UnconnectedState) {
         // waitForConnected sets the error state and closes the socket
         QSOCKS5_Q_DEBUG << "waitForConnected to proxy server" << d->data->controlSocket->errorString();
@@ -1422,11 +1420,9 @@ void QSocks5SocketEngine::close()
     Q_D(QSocks5SocketEngine);
     if (d->data && d->data->controlSocket) {
         if (d->data->controlSocket->state() == QAbstractSocket::ConnectedState) {
-            int msecs = 100;
-            QElapsedTimer stopWatch;
-            stopWatch.start();
+            QDeadlineTimer deadline(100ms);
             while (!d->data->controlSocket->bytesToWrite()) {
-               if (!d->data->controlSocket->waitForBytesWritten(qt_subtract_from_timeout(msecs, stopWatch.elapsed())))
+               if (!d->data->controlSocket->waitForBytesWritten(deadline.remainingTime()))
                    break;
             }
         }
@@ -1679,7 +1675,7 @@ bool QSocks5SocketEngine::setOption(SocketOption option, int value)
     return false;
 }
 
-bool QSocks5SocketEnginePrivate::waitForConnected(int msecs, bool *timedOut)
+bool QSocks5SocketEnginePrivate::waitForConnected(QDeadlineTimer deadline, bool *timedOut)
 {
     if (data->controlSocket->state() == QAbstractSocket::UnconnectedState)
         return false;
@@ -1689,11 +1685,8 @@ bool QSocks5SocketEnginePrivate::waitForConnected(int msecs, bool *timedOut)
         mode == BindMode ? BindSuccess :
         UdpAssociateSuccess;
 
-    QElapsedTimer stopWatch;
-    stopWatch.start();
-
     while (socks5State != wantedState) {
-        if (!data->controlSocket->waitForReadyRead(qt_subtract_from_timeout(msecs, stopWatch.elapsed()))) {
+        if (!data->controlSocket->waitForReadyRead(deadline.remainingTime())) {
             if (data->controlSocket->state() == QAbstractSocket::UnconnectedState)
                 return true;
 
@@ -1707,18 +1700,15 @@ bool QSocks5SocketEnginePrivate::waitForConnected(int msecs, bool *timedOut)
     return true;
 }
 
-bool QSocks5SocketEngine::waitForRead(int msecs, bool *timedOut)
+bool QSocks5SocketEngine::waitForRead(QDeadlineTimer deadline, bool *timedOut)
 {
     Q_D(QSocks5SocketEngine);
-    QSOCKS5_DEBUG << "waitForRead" << msecs;
+    QSOCKS5_DEBUG << "waitForRead" << deadline.remainingTimeAsDuration();
 
     d->readNotificationActivated = false;
 
-    QElapsedTimer stopWatch;
-    stopWatch.start();
-
     // are we connected yet?
-    if (!d->waitForConnected(msecs, timedOut))
+    if (!d->waitForConnected(deadline, timedOut))
         return false;
     if (d->data->controlSocket->state() == QAbstractSocket::UnconnectedState)
         return true;
@@ -1732,7 +1722,7 @@ bool QSocks5SocketEngine::waitForRead(int msecs, bool *timedOut)
     if (d->mode == QSocks5SocketEnginePrivate::ConnectMode ||
         d->mode == QSocks5SocketEnginePrivate::BindMode) {
         while (!d->readNotificationActivated) {
-            if (!d->data->controlSocket->waitForReadyRead(qt_subtract_from_timeout(msecs, stopWatch.elapsed()))) {
+            if (!d->data->controlSocket->waitForReadyRead(deadline.remainingTime())) {
                 if (d->data->controlSocket->state() == QAbstractSocket::UnconnectedState)
                     return true;
 
@@ -1745,7 +1735,7 @@ bool QSocks5SocketEngine::waitForRead(int msecs, bool *timedOut)
 #ifndef QT_NO_UDPSOCKET
     } else {
         while (!d->readNotificationActivated) {
-            if (!d->udpData->udpSocket->waitForReadyRead(qt_subtract_from_timeout(msecs, stopWatch.elapsed()))) {
+            if (!d->udpData->udpSocket->waitForReadyRead(deadline.remainingTime())) {
                 setError(d->udpData->udpSocket->error(), d->udpData->udpSocket->errorString());
                 if (timedOut && d->udpData->udpSocket->error() == QAbstractSocket::SocketTimeoutError)
                     *timedOut = true;
@@ -1764,16 +1754,13 @@ bool QSocks5SocketEngine::waitForRead(int msecs, bool *timedOut)
 }
 
 
-bool QSocks5SocketEngine::waitForWrite(int msecs, bool *timedOut)
+bool QSocks5SocketEngine::waitForWrite(QDeadlineTimer deadline, bool *timedOut)
 {
     Q_D(QSocks5SocketEngine);
-    QSOCKS5_DEBUG << "waitForWrite" << msecs;
-
-    QElapsedTimer stopWatch;
-    stopWatch.start();
+    QSOCKS5_DEBUG << "waitForWrite" << deadline.remainingTimeAsDuration();
 
     // are we connected yet?
-    if (!d->waitForConnected(msecs, timedOut))
+    if (!d->waitForConnected(deadline, timedOut))
         return false;
     if (d->data->controlSocket->state() == QAbstractSocket::UnconnectedState)
         return true;
@@ -1782,27 +1769,32 @@ bool QSocks5SocketEngine::waitForWrite(int msecs, bool *timedOut)
 
     // flush any bytes we may still have buffered in the time that we have left
     if (d->data->controlSocket->bytesToWrite())
-        d->data->controlSocket->waitForBytesWritten(qt_subtract_from_timeout(msecs, stopWatch.elapsed()));
-    while ((msecs == -1 || stopWatch.elapsed() < msecs)
-           && d->data->controlSocket->state() == QAbstractSocket::ConnectedState
-           && d->data->controlSocket->bytesToWrite() >= MaxWriteBufferSize)
-        d->data->controlSocket->waitForBytesWritten(qt_subtract_from_timeout(msecs, stopWatch.elapsed()));
+        d->data->controlSocket->waitForBytesWritten(deadline.remainingTime());
+
+    auto shouldWriteBytes = [&]() {
+        return d->data->controlSocket->state() == QAbstractSocket::ConnectedState
+                && d->data->controlSocket->bytesToWrite() >= MaxWriteBufferSize;
+    };
+
+    qint64 remainingTime = deadline.remainingTime();
+    for (; remainingTime > 0 && shouldWriteBytes(); remainingTime = deadline.remainingTime())
+        d->data->controlSocket->waitForBytesWritten(remainingTime);
     return d->data->controlSocket->bytesToWrite() < MaxWriteBufferSize;
 }
 
 bool QSocks5SocketEngine::waitForReadOrWrite(bool *readyToRead, bool *readyToWrite,
                                             bool checkRead, bool checkWrite,
-                                            int msecs, bool *timedOut)
+                                            QDeadlineTimer deadline, bool *timedOut)
 {
     Q_UNUSED(checkRead);
     if (!checkWrite) {
-        bool canRead = waitForRead(msecs, timedOut);
+        bool canRead = waitForRead(deadline, timedOut);
         if (readyToRead)
             *readyToRead = canRead;
         return canRead;
     }
 
-    bool canWrite = waitForWrite(msecs, timedOut);
+    bool canWrite = waitForWrite(deadline, timedOut);
     if (readyToWrite)
         *readyToWrite = canWrite;
     return canWrite;
diff --git a/src/network/socket/qsocks5socketengine_p.h b/src/network/socket/qsocks5socketengine_p.h
index 790c3077cf7..3a169812df8 100644
--- a/src/network/socket/qsocks5socketengine_p.h
+++ b/src/network/socket/qsocks5socketengine_p.h
@@ -78,11 +78,14 @@ public:
     int option(SocketOption option) const override;
     bool setOption(SocketOption option, int value) override;
 
-    bool waitForRead(int msecs = 30000, bool *timedOut = nullptr) override;
-    bool waitForWrite(int msecs = 30000, bool *timedOut = nullptr) override;
+    bool waitForRead(QDeadlineTimer deadline = QDeadlineTimer{DefaultTimeout},
+                     bool *timedOut = nullptr) override;
+    bool waitForWrite(QDeadlineTimer deadline = QDeadlineTimer{DefaultTimeout},
+                      bool *timedOut = nullptr) override;
     bool waitForReadOrWrite(bool *readyToRead, bool *readyToWrite,
                             bool checkRead, bool checkWrite,
-                            int msecs = 30000, bool *timedOut = nullptr) override;
+                            QDeadlineTimer deadline = QDeadlineTimer{DefaultTimeout},
+                            bool *timedOut = nullptr) override;
 
     bool isReadNotificationEnabled() const override;
     void setReadNotificationEnabled(bool enable) override;
@@ -208,7 +211,7 @@ public:
     void parseRequestMethodReply();
     void parseNewConnection();
 
-    bool waitForConnected(int msecs, bool *timedOut);
+    bool waitForConnected(QDeadlineTimer deadline, bool *timedOut);
 
     void _q_controlSocketConnected();
     void _q_controlSocketReadNotification();
diff --git a/src/network/socket/qtcpserver.cpp b/src/network/socket/qtcpserver.cpp
index eb2d757a08e..a0c0f00aaae 100644
--- a/src/network/socket/qtcpserver.cpp
+++ b/src/network/socket/qtcpserver.cpp
@@ -498,7 +498,7 @@ bool QTcpServer::waitForNewConnection(int msec, bool *timedOut)
     if (d->state != QAbstractSocket::ListeningState)
         return false;
 
-    if (!d->socketEngine->waitForRead(msec, timedOut)) {
+    if (!d->socketEngine->waitForRead(QDeadlineTimer(msec), timedOut)) {
         d->serverSocketError = d->socketEngine->error();
         d->serverSocketErrorString = d->socketEngine->errorString();
         return false;
diff --git a/tests/auto/corelib/kernel/qsocketnotifier/tst_qsocketnotifier.cpp b/tests/auto/corelib/kernel/qsocketnotifier/tst_qsocketnotifier.cpp
index 641b74bd9f0..c743ecab88b 100644
--- a/tests/auto/corelib/kernel/qsocketnotifier/tst_qsocketnotifier.cpp
+++ b/tests/auto/corelib/kernel/qsocketnotifier/tst_qsocketnotifier.cpp
@@ -189,8 +189,8 @@ void tst_QSocketNotifier::unexpectedDisconnection()
     writeEnd2->waitForBytesWritten();
 
     // ensure both read ends are ready for reading, before the event loop
-    QVERIFY(readEnd1.waitForRead(5000));
-    QVERIFY(readEnd2.waitForRead(5000));
+    QVERIFY(readEnd1.waitForRead(5s));
+    QVERIFY(readEnd2.waitForRead(5s));
 
     UnexpectedDisconnectTester tester(&readEnd1, &readEnd2);
 
diff --git a/tests/auto/network/socket/qhttpsocketengine/tst_qhttpsocketengine.cpp b/tests/auto/network/socket/qhttpsocketengine/tst_qhttpsocketengine.cpp
index c9bf8b92f33..f1cf448c50c 100644
--- a/tests/auto/network/socket/qhttpsocketengine/tst_qhttpsocketengine.cpp
+++ b/tests/auto/network/socket/qhttpsocketengine/tst_qhttpsocketengine.cpp
@@ -18,6 +18,8 @@
 
 #include "../../../network-settings.h"
 
+using namespace std::chrono_literals;
+
 class tst_QHttpSocketEngine : public QObject
 {
     Q_OBJECT
@@ -323,7 +325,7 @@ void tst_QHttpSocketEngine::simpleErrorsAndStates()
         QCOMPARE(socketDevice.state(), QAbstractSocket::UnconnectedState);
         QVERIFY(!socketDevice.connectToHost(QHostAddress(QtNetworkSettings::socksProxyServerName()), 8088));
         QCOMPARE(socketDevice.state(), QAbstractSocket::ConnectingState);
-        if (socketDevice.waitForWrite(30000)) {
+        if (socketDevice.waitForWrite(30s)) {
             QVERIFY(socketDevice.state() == QAbstractSocket::ConnectedState ||
                     socketDevice.state() == QAbstractSocket::UnconnectedState);
         } else {
diff --git a/tests/auto/network/socket/qsocks5socketengine/tst_qsocks5socketengine.cpp b/tests/auto/network/socket/qsocks5socketengine/tst_qsocks5socketengine.cpp
index aa860893bb1..5020612da3a 100644
--- a/tests/auto/network/socket/qsocks5socketengine/tst_qsocks5socketengine.cpp
+++ b/tests/auto/network/socket/qsocks5socketengine/tst_qsocks5socketengine.cpp
@@ -23,6 +23,8 @@
 
 #include "../../../network-settings.h"
 
+using namespace std::chrono_literals;
+
 class tst_QSocks5SocketEngine : public QObject, public QAbstractSocketEngineReceiver
 {
     Q_OBJECT
@@ -341,7 +343,7 @@ void tst_QSocks5SocketEngine::simpleErrorsAndStates()
         QCOMPARE(socketDevice.state(), QAbstractSocket::UnconnectedState);
         QVERIFY(!socketDevice.connectToHost(QHostInfo::fromName(QtNetworkSettings::socksProxyServerName()).addresses().first(), 8088));
         QCOMPARE(socketDevice.state(), QAbstractSocket::ConnectingState);
-        if (socketDevice.waitForWrite(15000)) {
+        if (socketDevice.waitForWrite(15s)) {
             QVERIFY(socketDevice.state() == QAbstractSocket::UnconnectedState ||
                     socketDevice.state() == QAbstractSocket::ConnectedState);
         } else {
diff --git a/tests/manual/socketengine/main.cpp b/tests/manual/socketengine/main.cpp
index d79f14f339b..79a000fa76f 100644
--- a/tests/manual/socketengine/main.cpp
+++ b/tests/manual/socketengine/main.cpp
@@ -13,6 +13,8 @@
 #include <cstdio>
 #include <QCoreApplication>
 
+using namespace std::chrono_literals;
+
 const int bufsize = 16*1024;
 char buf[bufsize];
 
@@ -39,7 +41,7 @@ int main(int argc, char**argv)
     int r = socketEngine->connectToHost(QHostAddress("74.125.77.99"), 80); // google
     bool readyToRead = false;
     bool readyToWrite = false;
-    socketEngine->waitForReadOrWrite(&readyToRead, &readyToWrite, true, true, 10*1000);
+    socketEngine->waitForReadOrWrite(&readyToRead, &readyToWrite, true, true, 10s);
     if (r <= 0) //timeout or error
         exit(1);
     if (readyToWrite) {
@@ -49,7 +51,7 @@ int main(int argc, char**argv)
         if (ret == request.length()) {
             // read the response in a loop
             do {
-                bool waitReadResult = socketEngine->waitForRead(10*1000);
+                bool waitReadResult = socketEngine->waitForRead(10s);
                 int available = socketEngine->bytesAvailable();
                 if (waitReadResult == true && available == 0) {
                     // disconnected