QMutex: remove qmutex_win.cpp

It hasn't been used since 91f6460aff, a
commit that added support for futexes on Windows. It defines
QT_ALWAYS_USE_FUTEX.

Pick-to: 6.4
Change-Id: Ieba79baf5ac34264a988fffd172612892bd670d7
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>

src/corelib/CMakeLists.txt

@@ -537,7 +537,6 @@ qt_internal_extend_target(Core CONDITION QT_FEATURE_animation
 # from the wrong DLL at runtime and crash!
 qt_internal_extend_target(Core CONDITION QT_FEATURE_thread AND WIN32
     SOURCES
-        thread/qmutex_win.cpp
         thread/qwaitcondition_win.cpp
     LIBRARIES
         synchronization
@@ -1407,7 +1406,6 @@ qt_internal_extend_target(Core CONDITION WASM
 set_source_files_properties(
     thread/qmutex_mac.cpp
     thread/qmutex_unix.cpp
-    thread/qmutex_win.cpp
     PROPERTIES HEADER_FILE_ONLY ON)  # special case: These files are included by qmutex.cpp!
 
 

src/corelib/thread/qlocking_p.h

@@ -8,10 +8,9 @@
 //  W A R N I N G
 //  -------------
 //
-// This file is not part of the Qt API.  It exists for the convenience
+// This file is not part of the Qt API. It exists for the convenience of
-// of qmutex.cpp, qmutex_unix.cpp, and qmutex_win.cpp.  This header
+// qmutex.cpp and qmutex_unix.cpp. This header file may change from version to
-// file may change from version to version without notice, or even be
+// version without notice, or even be removed.
-// removed.
 //
 // We mean it.
 //

src/corelib/thread/qmutex.cpp

@@ -865,12 +865,10 @@ void QMutexPrivate::derefWaiters(int value) noexcept
 
 QT_END_NAMESPACE
 
-#if defined(Q_OS_LINUX) && defined(QT_ALWAYS_USE_FUTEX)
+#if defined(QT_ALWAYS_USE_FUTEX)
 // nothing
 #elif defined(Q_OS_MAC)
 #  include "qmutex_mac.cpp"
-#elif defined(Q_OS_WIN)
-#  include "qmutex_win.cpp"
 #else
 #  include "qmutex_unix.cpp"
 #endif

src/corelib/thread/qmutex_p.h

@@ -10,10 +10,9 @@
 //  W A R N I N G
 //  -------------
 //
-// This file is not part of the Qt API.  It exists for the convenience
+// This file is not part of the Qt API. It exists for the convenience of
-// of qmutex.cpp, qmutex_unix.cpp, and qmutex_win.cpp.  This header
+// qmutex.cpp and qmutex_unix.cpp. This header file may change from version to
-// file may change from version to version without notice, or even be
+// version without notice, or even be removed.
-// removed.
 //
 // We mean it.
 //
@@ -90,8 +89,6 @@ public:
     bool wakeup;
     pthread_mutex_t mutex;
     pthread_cond_t cond;
-#elif defined(Q_OS_WIN)
-    Qt::HANDLE event;
 #endif
 };
 

src/corelib/thread/qmutex_win.cpp

@@ -1,30 +0,0 @@
-// Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
-
-#include "qmutex.h"
-#include <qatomic.h>
-#include "qmutex_p.h"
-#include <qt_windows.h>
-
-QT_BEGIN_NAMESPACE
-
-QMutexPrivate::QMutexPrivate()
-{
-    event = CreateEvent(0, FALSE, FALSE, 0);
-
-    if (!event)
-        qWarning("QMutexPrivate::QMutexPrivate: Cannot create event");
-}
-
-QMutexPrivate::~QMutexPrivate()
-{ CloseHandle(event); }
-
-bool QMutexPrivate::wait(int timeout)
-{
-    return (WaitForSingleObjectEx(event, timeout < 0 ? INFINITE : timeout, FALSE) == WAIT_OBJECT_0);
-}
-
-void QMutexPrivate::wakeUp() noexcept
-{ SetEvent(event); }
-
-QT_END_NAMESPACE

src/corelib/thread/qwaitcondition_p.h

@@ -7,10 +7,9 @@
 //  W A R N I N G
 //  -------------
 //
-// This file is not part of the Qt API.  It exists for the convenience
+// This file is not part of the Qt API. It exists for the convenience of
-// of qmutex.cpp, qmutex_unix.cpp, and qmutex_win.cpp.  This header
+// qmutex.cpp and qmutex_unix.cpp. This header file may change from version to
-// file may change from version to version without notice, or even be
+// version without notice, or even be removed.
-// removed.
 //
 // We mean it.
 //