Added wxCriticalSection::TryEnter() method.

This is similar to wxMutex::TryLock() and useful for the same reasons.

Closes #13638.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69883 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/thread.h

@@ -249,6 +249,9 @@ public:
     // enter the section (the same as locking a mutex)
     wxCRITSECT_INLINE void Enter();
 
+    // try to enter the section (the same as trying to lock a mutex)
+    wxCRITSECT_INLINE bool TryEnter();
+
     // leave the critical section (same as unlocking a mutex)
     wxCRITSECT_INLINE void Leave();
 
@@ -291,6 +294,7 @@ private:
     inline wxCriticalSection::~wxCriticalSection() { }
 
     inline void wxCriticalSection::Enter() { (void)m_mutex.Lock(); }
+    inline bool wxCriticalSection::TryEnter() { return m_mutex.TryLock() == wxMUTEX_NO_ERROR; }
     inline void wxCriticalSection::Leave() { (void)m_mutex.Unlock(); }
 #endif // wxCRITSECT_IS_MUTEX