[Piglit] [PATCH 03/10] piglit-util: add piglit_get_microseconds

[Jordan Justen]

Signed-off-by: Jordan Justen <jordan.l.justen at intel.com>
Cc: Chad Versace <chad.versace at linux.intel.com>
---
Chad, this conflicts with your "Detect if system has POSIX clocks" patch,
but it could be tweaked to follow your version.

 CMakeLists.txt           |    6 ++++++
 tests/util/piglit-util.c |   17 +++++++++++++++++
 tests/util/piglit-util.h |    8 ++++++++
 3 files changed, 31 insertions(+)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4ec5ddf..c876a05 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,7 @@ INCLUDE (CheckCCompilerFlag)
 INCLUDE (CheckCXXCompilerFlag)
 INCLUDE (CheckFunctionExists)
 INCLUDE (CheckIncludeFile)
+INCLUDE (CheckLibraryExists)
 INCLUDE (FindPkgConfig)
 
 project (piglit)
@@ -294,6 +295,11 @@ check_function_exists(strchrnul HAVE_STRCHRNUL)
 check_function_exists(strndup   HAVE_STRNDUP)
 check_function_exists(fopen_s   HAVE_FOPEN_S)
 check_function_exists(setrlimit HAVE_SETRLIMIT)
+check_function_exists(clock_gettime HAVE_CLOCK_GETTIME_FUNC)
+check_library_exists(rt clock_gettime "time.h" HAVE_CLOCK_GETTIME_RT)
+if(HAVE_CLOCK_GETTIME_FUNC OR HAVE_CLOCK_GETTIME_RT)
+    add_definitions(-DHAVE_CLOCK_GETTIME)
+endif()
 
 check_include_file(sys/time.h  HAVE_SYS_TIME_H)
 check_include_file(sys/types.h HAVE_SYS_TYPES_H)
diff --git a/tests/util/piglit-util.c b/tests/util/piglit-util.c
index 71d55a7..18df0b6 100644
--- a/tests/util/piglit-util.c
+++ b/tests/util/piglit-util.c
@@ -33,6 +33,10 @@
 #include <string.h>
 #include <errno.h>
 
+#ifdef HAVE_CLOCK_GETTIME
+#include <time.h>
+#endif
+
 #include "config.h"
 #if defined(HAVE_SYS_TIME_H) && defined(HAVE_SYS_RESOURCE_H) && defined(HAVE_SETRLIMIT)
 #include <sys/time.h>
@@ -462,3 +466,16 @@ write_null:
 	va_end(va);
 	return size_written;
 }
+
+uint64_t
+piglit_get_microseconds(void)
+{
+#ifdef HAVE_CLOCK_GETTIME
+	struct timespec t;
+	clock_gettime(CLOCK_MONOTONIC, &t);
+	return (t.tv_sec * 1000000) + (t.tv_nsec / 1000);
+#else
+	return (uint64_t) 0;
+#endif
+}
+
diff --git a/tests/util/piglit-util.h b/tests/util/piglit-util.h
index 52f053e..6f64ccf 100644
--- a/tests/util/piglit-util.h
+++ b/tests/util/piglit-util.h
@@ -174,6 +174,14 @@ piglit_source_dir(void);
 size_t
 piglit_join_paths(char buf[], size_t buf_size, int n, ...);
 
+/**
+ * \brief Get a monotonically increasing time in microseconds
+ *
+ * This time can be used for relative time measurements.
+ */
+uint64_t
+piglit_get_microseconds(void);
+
 #ifdef __cplusplus
 } /* end extern "C" */
 #endif
-- 
1.7.10.4