#pragma interface "thread.h"
#endif
-#include "wx/object.h"
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
#include "wx/setup.h"
-typedef enum {
- MUTEX_NO_ERROR=0,
- MUTEX_DEAD_LOCK, // Mutex has been already locked by THE CALLING thread
- MUTEX_BUSY // Mutex has been already locked by ONE thread
+#if wxUSE_THREADS
+#include "wx/module.h"
+
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+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_UNLOCKED,
+ wxMUTEX_MISC_ERROR
} wxMutexError;
-typedef enum {
- THREAD_NO_ERROR=0, // No error
- THREAD_NO_RESOURCE, // No resource left to create a new thread
- THREAD_RUNNING, // The thread is already running
- THREAD_NOT_RUNNING // The thread isn't running
+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_NOT_RUNNING, // The thread isn't running
+ wxTHREAD_MISC_ERROR // Some other error
} wxThreadError;
-// defines the interval of priority.
-#define WXTHREAD_MIN_PRIORITY 0
+/* defines the interval of priority. */
+#define WXTHREAD_MIN_PRIORITY 0
#define WXTHREAD_DEFAULT_PRIORITY 50
-#define WXTHREAD_MAX_PRIORITY 100
+#define WXTHREAD_MAX_PRIORITY 100
-// ---------------------------------------------------------------------------
-// Mutex handler
-class wxMutexInternal;
-class WXDLLEXPORT wxMutex {
+// ----------------------------------------------------------------------------
+// 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
+{
public:
- // constructor & destructor
- wxMutex(void);
- ~wxMutex(void);
-
- // Lock the mutex.
- wxMutexError Lock(void);
- // Try to lock the mutex: if it can't, returns immediately with an error.
- wxMutexError TryLock(void);
- // Unlock the mutex.
- wxMutexError Unlock(void);
-
- // Returns true if the mutex is locked.
- bool IsLocked(void) { return (m_locked > 0); }
+ // 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();
+
+ // 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;
+ 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();
+
+ // 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(void);
- ~wxCondition(void);
+ wxCondition();
+ ~wxCondition();
- // Waits undefinitely.
+ // Waits indefinitely.
void Wait(wxMutex& mutex);
// Waits until a signal is raised or the timeout is elapsed.
bool Wait(wxMutex& mutex, unsigned long sec, unsigned long nsec);
// Raises a signal: only one "Waiter" is released.
- void Signal(void);
+ void Signal();
// Broadcasts to all "Waiters".
- void Broadcast(void);
+ void Broadcast();
+
private:
wxConditionInternal *p_internal;
};
-// ---------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
// Thread management class
+// ----------------------------------------------------------------------------
+
class wxThreadInternal;
-class WXDLLEXPORT wxThread {
+class WXDLLEXPORT wxThread
+{
public:
// constructor & destructor.
- wxThread(void);
- virtual ~wxThread(void);
+ wxThread();
+ virtual ~wxThread();
// Create a new thread, this method should check there is only one thread
// running by object.
- wxThreadError Create(void);
+ wxThreadError Create();
+
+ // Destroys the thread immediately if the defer flag isn't true.
+ wxThreadError Destroy();
+
+ // Pause a running thread
+ wxThreadError Pause();
- // Destroys the thread immediately if the flag DIFFER isn't true.
- wxThreadError Destroy(void);
+ // Resume a paused thread
+ wxThreadError Resume();
- // Switches on the DIFFER flag.
+ // Switches on the defer flag.
void DeferDestroy(bool on);
// Waits for the termination of the thread.
- void *Join(void);
+ void *Join();
// Sets the priority to "prio". (Warning: The priority can only be set before
// the thread is created)
void SetPriority(int prio);
// Get the current priority.
- int GetPriority(void);
+ int GetPriority() const;
// Get the thread ID
- unsigned long GetID(void);
+ unsigned long GetID() const;
// Returns true if the thread is alive.
- bool IsAlive(void);
- // Returns true if the thread is the main thread (aka the GUI thread).
- static bool IsMain(void);
+ bool IsAlive() const;
+ // Returns true if the thread is running (not paused, not killed).
+ bool IsRunning() const;
+ // Returns true if the thread is suspended
+ bool IsPaused() const { return IsAlive() && !IsRunning(); }
+
+ // Returns true if current thread is the main thread (aka the GUI thread)
+ static bool IsMain();
// Called when thread exits.
- virtual void OnExit(void);
+ virtual void OnExit();
+
protected:
- // In case, the DIFFER flag is true, enables another thread to kill this one.
- void TestDestroy(void);
+ // Returns TRUE if the thread was asked to terminate
+ bool TestDestroy();
+
// Exits from the current thread.
void Exit(void *status = NULL);
+
private:
// Entry point for the thread.
- virtual void *Entry(void) = 0;
+ virtual void *Entry() = 0;
private:
friend class wxThreadInternal;
wxThreadInternal *p_internal;
};
-// ---------------------------------------------------------------------------
-// Global variables
+// ----------------------------------------------------------------------------
+// Automatic initialization
+// ----------------------------------------------------------------------------
-// GUI mutex.
-WXDLLEXPORT_DATA(extern wxMutex) wxMainMutex;
+// GUI mutex handling.
+void WXDLLEXPORT wxMutexGuiEnter();
+void WXDLLEXPORT wxMutexGuiLeave();
-#endif
+#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