From d375843b65d3893cfeb211c2d58cc1c2ae01cb00 Mon Sep 17 00:00:00 2001
From: Jakob Bornecrantz <jakob@collabora.com>
Date: Thu, 27 Feb 2020 13:53:03 +0000
Subject: [PATCH] os/time: Add time getting and conversion functions

For Linux it is based on CLOCK_MONOTONIC.
---
 src/xrt/auxiliary/os/os_time.h | 44 ++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/src/xrt/auxiliary/os/os_time.h b/src/xrt/auxiliary/os/os_time.h
index 9adf49ee9..b34c2ab05 100644
--- a/src/xrt/auxiliary/os/os_time.h
+++ b/src/xrt/auxiliary/os/os_time.h
@@ -15,6 +15,7 @@
 
 #ifdef XRT_OS_LINUX
 #include <time.h>
+#include <sys/time.h>
 #else
 #error "No time support on non-Linux platforms yet."
 #endif
@@ -23,6 +24,7 @@
 extern "C" {
 #endif
 
+
 /*!
  * Write an output report to the given device.
  */
@@ -38,6 +40,48 @@ os_nanosleep(long nsec)
 #endif
 }
 
+#ifdef XRT_OS_LINUX
+/*!
+ * Convert a timespec struct to nanoseconds.
+ */
+XRT_MAYBE_UNUSED static inline uint64_t
+os_timespec_to_ns(struct timespec *spec)
+{
+	uint64_t ns = 0;
+	ns += (uint64_t)spec->tv_sec * 1000 * 1000 * 1000;
+	ns += (uint64_t)spec->tv_nsec;
+	return ns;
+}
+
+/*!
+ * Convert a timeval struct to nanoseconds.
+ */
+XRT_MAYBE_UNUSED static inline uint64_t
+os_timeval_to_ns(struct timeval *val)
+{
+	uint64_t ns = 0;
+	ns += (uint64_t)val->tv_sec * 1000 * 1000 * 1000;
+	ns += (uint64_t)val->tv_usec * 1000;
+	return ns;
+}
+
+/*!
+ * Return a monotonic clock in nanoseconds.
+ */
+XRT_MAYBE_UNUSED static inline uint64_t
+os_monotonic_get_ns(void)
+{
+	struct timespec ts;
+	int ret = clock_gettime(CLOCK_MONOTONIC, &ts);
+	if (ret != 0) {
+		return 0;
+	}
+
+	return os_timespec_to_ns(&ts);
+}
+#endif
+
+
 #ifdef __cplusplus
 }
 #endif