add vcglib

vcglib/wrap/system/multithreading/util.h

@@ -0,0 +1,41 @@
+#ifndef MT_UTIL_H
+#define MT_UTIL_H
+
+#if (defined(_MSC_VER))
+#include <windows.h>
+#elif (defined(__MINGW32__))
+#include <windows.h>
+#elif (defined(__linux__))
+#include <unistd.h>
+#else
+#include <unistd.h>
+//#error "mt utils.h : unrecognized environment."
+#endif
+
+namespace mt
+{
+
+inline void sleep_ms(unsigned int msecs)
+{
+#if (defined(_MSC_VER))
+	Sleep(DWORD(msecs));
+#elif (defined(__MINGW32__))
+	Sleep(DWORD(msecs));
+#elif (defined(__linux__))
+	const unsigned int  secs  = ((unsigned int)(msecs / 1000));
+	const unsigned long usecs = ((unsigned long)((msecs % 1000) * 1000));
+
+	sleep(secs);
+	usleep(usecs);
+#else
+	const unsigned int  secs  = ((unsigned int)(msecs / 1000));
+	const unsigned long usecs = ((unsigned long)((msecs % 1000) * 1000));
+
+	sleep(secs);
+	usleep(usecs);
+#endif
+}
+
+}
+
+#endif // MT_UTIL_H