3 files changed, 43 insertions, 30 deletions

diff --git a/src/corelib/io/qdir.cpp b/src/corelib/io/qdir.cpp
index 072eb2736..cb0fdeb17 100644
--- a/src/corelib/io/qdir.cpp
+++ b/src/corelib/io/qdir.cpp
@@ -1541,9 +1541,11 @@ bool QDir::isReadable() const
 /*!
     \overload
 
-    Returns true if the \e directory exists; otherwise returns false.
-    (If a file with the same name is found this function will return
-    false).
+    Returns true if the directory exists; otherwise returns false.
+    (If a file with the same name is found this function will return false).
+
+    The overload of this function that accepts an argument is used to test
+    for the presence of files and directories within a directory.
 
     \sa QFileInfo::exists(), QFile::exists()
 */
@@ -1773,8 +1775,11 @@ bool QDir::rename(const QString &oldName, const QString &newName)
 
 /*!
     Returns true if the file called \a name exists; otherwise returns
-    false. Unless \a name contains an absolute file path, the file
-    name is assumed to be relative to the current directory.
+    false.
+
+    Unless \a name contains an absolute file path, the file name is assumed
+    to be relative to the directory itself, so this function is typically used
+    to check for the presence of files within a directory.
 
     \sa QFileInfo::exists(), QFile::exists()
 */
diff --git a/src/corelib/io/qprocess_unix.cpp b/src/corelib/io/qprocess_unix.cpp
index 607b73450..168eac2e2 100644
--- a/src/corelib/io/qprocess_unix.cpp
+++ b/src/corelib/io/qprocess_unix.cpp
@@ -162,7 +162,17 @@ private:
     QMap<int, QProcessInfo *> children;
 };
 
-Q_GLOBAL_STATIC(QProcessManager, processManager)
+
+Q_GLOBAL_STATIC(QMutex, processManagerGlobalMutex)
+
+static QProcessManager *processManager() {
+    // The constructor of QProcessManager should be called only once
+    // so we cannot use Q_GLOBAL_STATIC directly for QProcessManager
+    QMutex *mutex = processManagerGlobalMutex();
+    QMutexLocker locker(mutex);
+    static QProcessManager processManager;
+    return &processManager;
+}
 
 QProcessManager::QProcessManager()
 {
diff --git a/src/corelib/io/qprocess_win.cpp b/src/corelib/io/qprocess_win.cpp
index eae17b4cf..d8da606c6 100644
--- a/src/corelib/io/qprocess_win.cpp
+++ b/src/corelib/io/qprocess_win.cpp
@@ -372,32 +372,30 @@ void QProcessPrivate::startProcess()
     qDebug("   pass environment : %s", environment.isEmpty() ? "no" : "yes");
 #endif
 
-    DWORD dwCreationFlags = CREATE_NO_WINDOW;
-
 #if defined(Q_OS_WINCE)
-        QString fullPathProgram = program;
-        if (!QDir::isAbsolutePath(fullPathProgram))
-            fullPathProgram = QFileInfo(fullPathProgram).absoluteFilePath();
-        fullPathProgram.replace(QLatin1Char('/'), QLatin1Char('\\'));
-        success = CreateProcess((wchar_t*)fullPathProgram.utf16(),
-                                (wchar_t*)args.utf16(),
-                                0, 0, false, 0, 0, 0, 0, pid);
+    QString fullPathProgram = program;
+    if (!QDir::isAbsolutePath(fullPathProgram))
+        fullPathProgram = QFileInfo(fullPathProgram).absoluteFilePath();
+    fullPathProgram.replace(QLatin1Char('/'), QLatin1Char('\\'));
+    success = CreateProcess((wchar_t*)fullPathProgram.utf16(),
+                            (wchar_t*)args.utf16(),
+                            0, 0, false, 0, 0, 0, 0, pid);
 #else
-        dwCreationFlags |= CREATE_UNICODE_ENVIRONMENT;
-        STARTUPINFOW startupInfo = { sizeof( STARTUPINFO ), 0, 0, 0,
-	                                 (ulong)CW_USEDEFAULT, (ulong)CW_USEDEFAULT,
-                                   (ulong)CW_USEDEFAULT, (ulong)CW_USEDEFAULT,
-                                   0, 0, 0,
-                                   STARTF_USESTDHANDLES,
-                                   0, 0, 0,
-                                   stdinChannel.pipe[0], stdoutChannel.pipe[1], stderrChannel.pipe[1]
-        };
-        success = CreateProcess(0, (wchar_t*)args.utf16(),
-                                0, 0, TRUE, dwCreationFlags,
-                                environment ? envlist.data() : 0,
-                                workingDirectory.isEmpty() ? 0
-                                    : (wchar_t*)QDir::toNativeSeparators(workingDirectory).utf16(),
-                                &startupInfo, pid);
+    DWORD dwCreationFlags = CREATE_NO_WINDOW;
+    dwCreationFlags |= CREATE_UNICODE_ENVIRONMENT;
+    STARTUPINFOW startupInfo = { sizeof( STARTUPINFO ), 0, 0, 0,
+                                 (ulong)CW_USEDEFAULT, (ulong)CW_USEDEFAULT,
+                                 (ulong)CW_USEDEFAULT, (ulong)CW_USEDEFAULT,
+                                 0, 0, 0,
+                                 STARTF_USESTDHANDLES,
+                                 0, 0, 0,
+                                 stdinChannel.pipe[0], stdoutChannel.pipe[1], stderrChannel.pipe[1]
+    };
+    success = CreateProcess(0, (wchar_t*)args.utf16(),
+                            0, 0, TRUE, dwCreationFlags,
+                            environment ? envlist.data() : 0,
+                            workingDirectory.isEmpty() ? 0 : (wchar_t*)QDir::toNativeSeparators(workingDirectory).utf16(),
+                            &startupInfo, pid);
 
     if (stdinChannel.pipe[0] != INVALID_Q_PIPE) {
         CloseHandle(stdinChannel.pipe[0]);