From dcd6a55529d70af2d9e39757579dfe67afbda8cf Mon Sep 17 00:00:00 2001
From: Chris Robinson <chris.kcat@gmail.com>
Date: Sun, 1 Nov 2009 10:03:05 -0800
Subject: [PATCH] Use a realtime clock for measuring time

---
 CMakeLists.txt            |  5 +++++
 OpenAL32/Include/alMain.h | 12 +++++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 533daa30..b11a20d4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -234,6 +234,11 @@ IF(NOT HAVE_WINDOWS_H)
     IF(HAVE_LIBPTHREAD)
         SET(EXTRA_LIBS pthread ${EXTRA_LIBS})
     ENDIF()
+
+    CHECK_LIBRARY_EXISTS(rt clock_gettime "" HAVE_LIBRT)
+    IF(HAVE_LIBRT)
+        SET(EXTRA_LIBS rt ${EXTRA_LIBS})
+    ENDIF()
 ENDIF()
 
 # Check for a 64-bit type
diff --git a/OpenAL32/Include/alMain.h b/OpenAL32/Include/alMain.h
index 2fa79574..bc6c6d8b 100644
--- a/OpenAL32/Include/alMain.h
+++ b/OpenAL32/Include/alMain.h
@@ -28,6 +28,7 @@ typedef DWORD tls_type;
 
 #else
 
+#include <unistd.h>
 #include <assert.h>
 #include <pthread.h>
 #ifdef HAVE_PTHREAD_NP_H
@@ -91,13 +92,22 @@ static inline void DeleteCriticalSection(CRITICAL_SECTION *cs)
  * as opposed to the actual time. */
 static inline ALuint timeGetTime(void)
 {
-    struct timeval tv;
     int ret;
+#ifdef _POSIX_TIMERS
+    struct timespec ts;
+
+    ret = clock_gettime(CLOCK_REALTIME, &ts);
+    assert(ret == 0);
+
+    return ts.tv_nsec/1000000 + ts.tv_sec*1000;
+#else
+    struct timeval tv;
 
     ret = gettimeofday(&tv, NULL);
     assert(ret == 0);
 
     return tv.tv_usec/1000 + tv.tv_sec*1000;
+#endif
 }
 
 static inline void Sleep(ALuint t)
-- 
2.11.4.GIT