Add a timing wrapper, using gettimeofday

CMakeLists.txt

@@ -132,6 +132,11 @@ ENDIF()
 # Check if we have Windows headers
 CHECK_INCLUDE_FILE(windows.h HAVE_WINDOWS_H)
 IF(NOT "${HAVE_WINDOWS_H}")
+    CHECK_FUNCTION_EXISTS(gettimeofday HAVE_GETTIMEOFDAY)
+    IF(NOT "${HAVE_GETTIMEOFDAY}")
+        MESSAGE(FATAL_ERROR "No timing function found!")
+    ENDIF()
+
     # We need pthreads outside of Windows
     CHECK_INCLUDE_FILE(pthread.h HAVE_PTHREAD_H)
     IF(NOT "${HAVE_PTHREAD_H}")

OpenAL32/Include/alMain.h

@@ -13,6 +13,7 @@
 
 #include <assert.h>
 #include <pthread.h>
+#include <sys/time.h>
 
 #define IsBadWritePtr(a,b) (0)
 
@@ -52,6 +53,21 @@ static inline void DeleteCriticalSection(CRITICAL_SECTION *cs)
     assert(ret == 0);
 }
 
+/* NOTE: This wrapper isn't quite accurate as it returns an ALuint, as opposed
+ * to the expected DWORD. Both are defined as unsigned 32-bit types, however.
+ * Additionally, Win32 is supposed to measure the time since Windows started,
+ * as opposed to the actual time. */
+static inline ALuint timeGetTime(void)
+{
+    struct timeval tv;
+    int ret;
+
+    ret = gettimeofday(&tv, NULL);
+    assert(ret == 0);
+
+    return tv.tv_usec/1000 + tv.tv_sec*1000;
+}
+
 #define min(x,y) (((x)<(y))?(x):(y))
 #define max(x,y) (((x)>(y))?(x):(y))
 #endif