Add level method to recursive mutex

Enhance thread safety when making event calls
Minor cleanup of whitespace in glib event loop

3 files changed, 32 insertions, 0 deletions

diff --git a/src/tools/qmutex.h b/src/tools/qmutex.h
index 9eb1a69..1dec4d2 100644
--- a/src/tools/qmutex.h
+++ b/src/tools/qmutex.h
@@ -74,6 +74,9 @@ private:
     QMutex( const QMutex & );
     QMutex &operator=( const QMutex & );
 #endif
+
+public:
+    int level();
 };
 
 class Q_EXPORT QMutexLocker
diff --git a/src/tools/qmutex_p.h b/src/tools/qmutex_p.h
index c80c349..d06839c 100644
--- a/src/tools/qmutex_p.h
+++ b/src/tools/qmutex_p.h
@@ -67,6 +67,7 @@ public:
     virtual bool locked() = 0;
     virtual bool trylock() = 0;
     virtual int type() const = 0;
+    virtual int level() = 0;
 };
 
 
diff --git a/src/tools/qmutex_unix.cpp b/src/tools/qmutex_unix.cpp
index fe60ac3..de0f909 100644
--- a/src/tools/qmutex_unix.cpp
+++ b/src/tools/qmutex_unix.cpp
@@ -85,6 +85,7 @@ public:
     bool locked();
     bool trylock();
     int type() const;
+    int level();
 
     bool recursive;
 };
@@ -101,6 +102,7 @@ public:
     bool locked();
     bool trylock();
     int type() const;
+    int level();
 
     int count;
     unsigned long owner;
@@ -196,6 +198,11 @@ int QRealMutexPrivate::type() const
     return recursive ? Q_MUTEX_RECURSIVE : Q_MUTEX_NORMAL;
 }
 
+int QRealMutexPrivate::level()
+{
+    return locked();
+}
+
 
 #ifndef    Q_RECURSIVE_MUTEX_TYPE
 QRecursiveMutexPrivate::QRecursiveMutexPrivate()
@@ -329,6 +336,11 @@ int QRecursiveMutexPrivate::type() const
     return Q_MUTEX_RECURSIVE;
 }
 
+int QRecursiveMutexPrivate::level()
+{
+    return count;
+}
+
 #endif // !Q_RECURSIVE_MUTEX_TYPE
 
 
@@ -511,6 +523,22 @@ bool QMutex::tryLock()
 }
 
 /*!
+    Returns the current lock level of the mutex.
+    0 means the mutex is unlocked
+    This method should only be called when the mutex has already been locked
+    by lock(), otherwise the lock level could change before the next line
+    of code is executed.
+
+    WARNING: Non-recursive mutexes will never exceed a lock level of 1!
+
+    \sa lock(), unlock(), locked()
+*/
+int QMutex::level()
+{
+    return d->level();
+}
+
+/*!
     \class QMutexLocker qmutex.h
     \brief The QMutexLocker class simplifies locking and unlocking QMutexes.