// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------
-#include "wx/object.h"
#include "wx/setup.h"
+#if wxUSE_THREADS
+#include "wx/module.h"
+
// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------
-typedef enum {
+typedef enum
+{
wxMUTEX_NO_ERROR = 0,
wxMUTEX_DEAD_LOCK, // Mutex has been already locked by THE CALLING thread
wxMUTEX_BUSY, // Mutex has been already locked by ONE thread
wxMUTEX_MISC_ERROR
} wxMutexError;
-typedef enum {
+typedef enum
+{
wxTHREAD_NO_ERROR = 0, // No error
wxTHREAD_NO_RESOURCE, // No resource left to create a new thread
wxTHREAD_RUNNING, // The thread is already running
wxTHREAD_MISC_ERROR // Some other error
} wxThreadError;
-// defines the interval of priority.
+/* defines the interval of priority. */
#define WXTHREAD_MIN_PRIORITY 0
#define WXTHREAD_DEFAULT_PRIORITY 50
#define WXTHREAD_MAX_PRIORITY 100
// ----------------------------------------------------------------------------
-// Mutex handler
+// A mutex object is a synchronization object whose state is set to signaled
+// when it is not owned by any thread, and nonsignaled when it is owned. Its
+// name comes from its usefulness in coordinating mutually-exclusive access to
+// a shared resource. Only one thread at a time can own a mutex object.
// ----------------------------------------------------------------------------
+
+// you should consider wxMutexLocker whenever possible instead of directly
+// working with wxMutex class - it is safer
class WXDLLEXPORT wxMutexInternal;
-class WXDLLEXPORT wxMutex {
+class WXDLLEXPORT wxMutex
+{
public:
- // constructor & destructor
- wxMutex();
- ~wxMutex();
+ // constructor & destructor
+ wxMutex();
+ ~wxMutex();
- // Lock the mutex.
- wxMutexError Lock();
- // Try to lock the mutex: if it can't, returns immediately with an error.
- wxMutexError TryLock();
- // Unlock the mutex.
- wxMutexError Unlock();
+ // Lock the mutex.
+ wxMutexError Lock();
+ // Try to lock the mutex: if it can't, returns immediately with an error.
+ wxMutexError TryLock();
+ // Unlock the mutex.
+ wxMutexError Unlock();
- // Returns true if the mutex is locked.
- bool IsLocked() const { return (m_locked > 0); }
+ // Returns true if the mutex is locked.
+ bool IsLocked() const { return (m_locked > 0); }
protected:
- friend class wxCondition;
+ friend class wxCondition;
+
+ // no assignment operator nor copy ctor
+ wxMutex(const wxMutex&);
+ wxMutex& operator=(const wxMutex&);
+
+ int m_locked;
+ wxMutexInternal *p_internal;
+};
+
+// a helper class which locks the mutex in the ctor and unlocks it in the dtor:
+// this ensures that mutex is always unlocked, even if the function returns or
+// throws an exception before it reaches the end
+class WXDLLEXPORT wxMutexLocker
+{
+public:
+ // lock the mutex in the ctor
+ wxMutexLocker(wxMutex *mutex)
+ { m_isOk = mutex && ((m_mutex = mutex)->Lock() == wxMUTEX_NO_ERROR); }
+
+ // returns TRUE if mutex was successfully locked in ctor
+ bool IsOk() const { return m_isOk; }
+
+ // unlock the mutex in dtor
+ ~wxMutexLocker() { if ( IsOk() ) m_mutex->Unlock(); }
+
+private:
+ // no assignment operator nor copy ctor
+ wxMutexLocker(const wxMutexLocker&);
+ wxMutexLocker& operator=(const wxMutexLocker&);
+
+ bool m_isOk;
+ wxMutex *m_mutex;
+};
+
+// ----------------------------------------------------------------------------
+// Critical section: this is the same as mutex but is only visible to the
+// threads of the same process. For the platforms which don't have native
+// support for critical sections, they're implemented entirely in terms of
+// mutexes
+// ----------------------------------------------------------------------------
+
+// you should consider wxCriticalSectionLocker whenever possible instead of
+// directly working with wxCriticalSection class - it is safer
+#ifdef __WXMSW__
+ class WXDLLEXPORT wxCriticalSectionInternal;
+ #define WXCRITICAL_INLINE
+#else // !MSW
+ #define WXCRITICAL_INLINE inline
+#endif // MSW/!MSW
+class WXDLLEXPORT wxCriticalSection
+{
+public:
+ // ctor & dtor
+ WXCRITICAL_INLINE wxCriticalSection();
+ WXCRITICAL_INLINE ~wxCriticalSection();
- int m_locked;
- wxMutexInternal *p_internal;
+ // enter the section (the same as locking a mutex)
+ void WXCRITICAL_INLINE Enter();
+ // leave the critical section (same as unlocking a mutex)
+ void WXCRITICAL_INLINE Leave();
+
+private:
+ // no assignment operator nor copy ctor
+ wxCriticalSection(const wxCriticalSection&);
+ wxCriticalSection& operator=(const wxCriticalSection&);
+
+#ifdef __WXMSW__
+ wxCriticalSectionInternal *m_critsect;
+#else // !MSW
+ wxMutex m_mutex;
+#endif // MSW/!MSW
+};
+
+// wxCriticalSectionLocker is the same to critical sections as wxMutexLocker is
+// to th mutexes
+class WXDLLEXPORT wxCriticalSectionLocker
+{
+public:
+ wxCriticalSectionLocker(wxCriticalSection& critsect) : m_critsect(critsect)
+ { m_critsect.Enter(); }
+ ~wxCriticalSectionLocker()
+ { m_critsect.Leave(); }
+
+private:
+ // no assignment operator nor copy ctor
+ wxCriticalSectionLocker(const wxCriticalSectionLocker&);
+ wxCriticalSectionLocker& operator=(const wxCriticalSectionLocker&);
+
+ wxCriticalSection& m_critsect;
};
// ----------------------------------------------------------------------------
// Condition handler.
// ----------------------------------------------------------------------------
+
class wxConditionInternal;
-class WXDLLEXPORT wxCondition {
+class WXDLLEXPORT wxCondition
+{
public:
// constructor & destructor
wxCondition();
// ----------------------------------------------------------------------------
// Thread management class
// ----------------------------------------------------------------------------
+
class wxThreadInternal;
-class WXDLLEXPORT wxThread {
+class WXDLLEXPORT wxThread
+{
public:
// constructor & destructor.
wxThread();
// Returns true if the thread is suspended
bool IsPaused() const { return IsAlive() && !IsRunning(); }
- // Returns true if the thread is the main thread (aka the GUI thread).
+ // Returns true if current thread is the main thread (aka the GUI thread)
static bool IsMain();
// Called when thread exits.
virtual void OnExit();
protected:
- // In case, the DIFFER flag is true, enables another thread to kill this one.
- void TestDestroy();
+ // Returns TRUE if the thread was asked to terminate
+ bool TestDestroy();
+
// Exits from the current thread.
void Exit(void *status = NULL);
};
// ----------------------------------------------------------------------------
-// Global functions and variables
+// Automatic initialization
// ----------------------------------------------------------------------------
// GUI mutex handling.
void WXDLLEXPORT wxMutexGuiEnter();
void WXDLLEXPORT wxMutexGuiLeave();
+#else // !wxUSE_THREADS
+
+// no thread support
+inline void WXDLLEXPORT wxMutexGuiEnter() { }
+inline void WXDLLEXPORT wxMutexGuiLeave() { }
+
+#endif // wxUSE_THREADS
+
+// automatically unlock GUI mutex in dtor
+class WXDLLEXPORT wxMutexGuiLocker
+{
+public:
+ wxMutexGuiLocker() { wxMutexGuiEnter(); }
+ ~wxMutexGuiLocker() { wxMutexGuiLeave(); }
+};
+
+// -----------------------------------------------------------------------------
+// implementation only until the end of file
+// -----------------------------------------------------------------------------
+#ifdef wxUSE_THREADS
+#ifdef __WXMSW__
+ // unlock GUI if there are threads waiting for and lock it back when
+ // there are no more of them - should be called periodically by the main
+ // thread
+ extern void WXDLLEXPORT wxMutexGuiLeaveOrEnter();
+
+ // returns TRUE if the main thread has GUI lock
+ extern bool WXDLLEXPORT wxGuiOwnedByMainThread();
+
+ // wakes up the main thread if it's sleeping inside ::GetMessage()
+ extern void WXDLLEXPORT wxWakeUpMainThread();
+#else // !MSW
+ // implement wxCriticalSection using mutexes
+ inline wxCriticalSection::wxCriticalSection() { }
+ inline wxCriticalSection::~wxCriticalSection() { }
+
+ inline void wxCriticalSection::Enter() { (void)m_mutex.Lock(); }
+ inline void wxCriticalSection::Leave() { (void)m_mutex.Unlock(); }
+#endif // MSW/!MSW
+#endif // wxUSE_THREADS
+
#endif // __THREADH__
projects / wxWidgets.git / blobdiff