+ // Each wxCondition object is associated with a (single) wxMutex object.
+ // The mutex object MUST be locked before calling Wait()
+ wxCondition(wxMutex& mutex);
+
+ // dtor is not virtual, don't use this class polymorphically
+ ~wxCondition();
+
+ // return TRUE if the condition has been created successfully
+ bool IsOk() const;
+
+ // NB: the associated mutex MUST be locked beforehand by the calling thread
+ //
+ // it atomically releases the lock on the associated mutex
+ // and starts waiting to be woken up by a Signal()/Broadcast()
+ // once its signaled, then it will wait until it can reacquire
+ // the lock on the associated mutex object, before returning.
+ wxCondError Wait();
+
+ // exactly as Wait() except that it may also return if the specified
+ // timeout ellapses even if the condition hasn't been signalled: in this
+ // case, the return value is FALSE, otherwise (i.e. in case of a normal
+ // return) it is TRUE
+ //
+ // the timeeout parameter specifies a interval that needs to be waited in
+ // milliseconds
+ wxCondError WaitTimeout(unsigned long milliseconds);
+
+ // NB: the associated mutex may or may not be locked by the calling thread
+ //
+ // this method unblocks one thread if any are blocking on the condition.
+ // if no thread is blocking in Wait(), then the signal is NOT remembered
+ // The thread which was blocking on Wait(), will then reacquire the lock
+ // on the associated mutex object before returning
+ wxCondError Signal();
+
+ // NB: the associated mutex may or may not be locked by the calling thread
+ //
+ // this method unblocks all threads if any are blocking on the condition.
+ // if no thread is blocking in Wait(), then the signal is NOT remembered
+ // The threads which were blocking on Wait(), will then reacquire the lock
+ // on the associated mutex object before returning.
+ wxCondError Broadcast();
+
+
+ // deprecated version, don't use
+ bool Wait(unsigned long milliseconds)
+ { return WaitTimeout(milliseconds) == wxCOND_NO_ERROR; }
+
+private:
+ wxConditionInternal *m_internal;
+
+ DECLARE_NO_COPY_CLASS(wxCondition)
+};
+
+// ----------------------------------------------------------------------------
+// wxSemaphore: a counter limiting the number of threads concurrently accessing
+// a shared resource
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxSemaphore
+{
+public:
+ // specifying a maxcount of 0 actually makes wxSemaphore behave as if there
+ // is no upper limit, if maxcount is 1 the semaphore behaves as a mutex
+ wxSemaphore( int initialcount = 0, int maxcount = 0 );
+
+ // dtor is not virtual, don't use this class polymorphically
+ ~wxSemaphore();
+
+ // return TRUE if the semaphore has been created successfully
+ bool IsOk() const;
+
+ // wait indefinitely, until the semaphore count goes beyond 0
+ // and then decrement it and return (this method might have been called
+ // Acquire())
+ wxSemaError Wait();
+
+ // same as Wait(), but does not block, returns wxSEMA_NO_ERROR if
+ // successful and wxSEMA_BUSY if the count is currently zero
+ wxSemaError TryWait();
+
+ // same as Wait(), but as a timeout limit, returns wxSEMA_NO_ERROR if the
+ // semaphore was acquired and wxSEMA_TIMEOUT if the timeout has ellapsed
+ wxSemaError WaitTimeout(unsigned long milliseconds);
+
+ // increments the semaphore count and signals one of the waiting threads
+ wxSemaError Post();
projects / wxWidgets.git / blobdiff