Added static method to check at runtime if Socket::select() is efficient.

Use select() on the MGCP reader socket if it worths.


git-svn-id: http://voip.null.ro/svn/yate@3798 acf43c95-373e-0410-b603-e72c3f656dc1

engine/Socket.cpp

@@ -1503,6 +1503,15 @@ int Socket::readData(void* buffer, int length)
 #endif
 }
 
+bool Socket::efficientSelect()
+{
+#if defined(_WINDOWS) || defined(HAVE_POLL)
+    return true;
+#else
+    return false;
+#endif
+}
+
 bool Socket::canSelect(SOCKET handle)
 {
     if (handle == invalidHandle())

libs/ymgcp/engine.cpp

@@ -335,6 +335,11 @@ bool MGCPEngine::receive(unsigned char* buffer, SocketAddr& addr)
 {
     if (!m_socket.valid())
 	return false;
+    if (Socket::efficientSelect() && m_socket.canSelect()) {
+	bool canRead = false;
+	if (m_socket.select(&canRead,0,0,Thread::idleUsec()) && !canRead)
+	    return false;
+    }
     int len = maxRecvPacket();
     int rd = m_socket.recvFrom(buffer,len,addr);
     if (rd == Socket::socketError()) {

yateclass.h

@@ -5771,6 +5771,12 @@ public:
      */
     SOCKET acceptHandle(struct sockaddr* addr = 0, socklen_t* addrlen = 0);
 
+    /**
+     * Check if select() is efficient on this platform and worth using frequently
+     * @return True if select() is efficiently implemented
+     */
+    static bool efficientSelect();
+
     /**
      * Check if a socket handle can be used in select
      * @param handle The socket handle to check