Added: Function to set thread priority

--HG--
branch : sound_dev

code/nel/include/nel/misc/p_thread.h

@@ -48,6 +48,7 @@ public:
 	virtual void wait();
 	virtual bool setCPUMask(uint64 cpuMask);
 	virtual uint64 getCPUMask();
+	virtual void setPriority(TThreadPriority priority);
 	virtual std::string getUserName();
 
 	virtual IRunnable *getRunnable()

code/nel/include/nel/misc/thread.h

@@ -68,6 +68,16 @@ public:
 	}
 };
 
+/// Thread priorities, numbering follows Win32 for now
+enum TThreadPriority
+{
+	ThreadPriorityLowest = -2,
+	ThreadPriorityLow = -1,
+	ThreadPriorityNormal = 0,
+	ThreadPriorityHigh = 1,
+	ThreadPriorityHighest = 2,
+};
+
 /**
  * Thread base interface, must be implemented for all OS
  * \author Vianney Lecroart
@@ -119,6 +129,9 @@ public:
 	  */
 	virtual uint64 getCPUMask()=0;
 
+	/// Set the thread priority. Thread must have been started before.
+	virtual void setPriority(TThreadPriority priority) = 0;
+
 	/**
 	  * Get the thread user name.
 	  * Under Linux return thread owner, under windows return the name of the logon user.

code/nel/include/nel/misc/win_thread.h

@@ -49,6 +49,7 @@ public:
 	virtual void wait();
 	virtual bool setCPUMask(uint64 cpuMask);
 	virtual uint64 getCPUMask();
+	virtual void setPriority(TThreadPriority priority);
 	virtual std::string getUserName();
 
 	virtual IRunnable *getRunnable()
@@ -69,8 +70,7 @@ public:
 	void suspend();
 	// Resume the thread. No-op if already resumed
 	void resume();
-	// set priority as defined by "SetThreadpriority"
-	void setPriority(int priority);
+	// Priority boost
 	void enablePriorityBoost(bool enabled);
 
 	/// private use

code/nel/src/misc/p_thread.cpp

@@ -207,6 +207,32 @@ uint64 CPThread::getCPUMask()
 	return cpuMask;
 }
 
+void CPThread::setPriority(TThreadPriority priority)
+{
+	// TODO: Verify and test this
+	switch (priority)
+	{
+	case ThreadPriorityHigh:
+	{
+		int minPrio = sched_get_priority_min(SCHED_FIFO);
+		int maxPrio = sched_get_priority_max(SCHED_FIFO);
+		int prio = ((maxPrio - minPrio) / 4) + minPrio;
+		pthread_setschedparam(_ThreadHandle, SCHED_FIFO, prio);
+		break;
+	}
+	case ThreadPriorityHighest:
+	{
+		int minPrio = sched_get_priority_min(SCHED_FIFO);
+		int maxPrio = sched_get_priority_max(SCHED_FIFO);
+		int prio = ((maxPrio - minPrio) / 2) + minPrio;
+		pthread_setschedparam(_ThreadHandle, SCHED_FIFO, prio);
+		break;
+	}
+	default:
+		pthread_setschedparam(_ThreadHandle, SCHED_OTHER, 0);
+	}
+}
+
 /*
  * getUserName
  */

code/nel/src/misc/win_thread.cpp

@@ -84,6 +84,7 @@ public:
 	inline void enter() { EnterCriticalSection(&cs); }
 	inline void leave() { LeaveCriticalSection(&cs); }
 };
+CWinCriticalSection s_CS;
 }/* anonymous namespace */
 
 CWinThread::CWinThread (void* threadHandle, uint32 threadId)
@@ -112,12 +113,11 @@ CWinThread::CWinThread (void* threadHandle, uint32 threadId)
 		nlassert(0); // WARNING: following code has not tested! don't know if it work fo real ...
 					 // This is just a suggestion of a possible solution, should this situation one day occur ...
 		// Ensure that this thread don't get deleted, or we could suspend the main thread
-		static CWinCriticalSection cs;
-		cs.enter();
+		s_CS.enter();
 		// the 2 following statement must be executed atomicaly among the threads of the current process !
 		SuspendThread(threadHandle);
 		_SuspendCount = ResumeThread(threadHandle);
-		cs.leave();
+		s_CS.leave();
 	}
 }
 
@@ -159,10 +159,10 @@ void CWinThread::resume()
 	}
 }
 
-void CWinThread::setPriority(int priority)
+void CWinThread::setPriority(TThreadPriority priority)
 {
 	nlassert(ThreadHandle); // 'start' was not called !!
-	BOOL result = SetThreadPriority(ThreadHandle, priority);
+	BOOL result = SetThreadPriority(ThreadHandle, (int)priority);
 	nlassert(result);
 }