Commit 903df4afbda3e9492aae4e2e626b7f87874e9894
2015-06-19T23:49:00
Use CLOCK_MONOTONIC_RAW, if available, which is not subject to adjustment by NTP
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diff --git a/src/timer/unix/SDL_systimer.c b/src/timer/unix/SDL_systimer.c
index bea7deb..9891721 100644
--- a/src/timer/unix/SDL_systimer.c
+++ b/src/timer/unix/SDL_systimer.c
@@ -48,6 +48,15 @@
#include <mach/mach_time.h>
#endif
+/* Use CLOCK_MONOTONIC_RAW, if available, which is not subject to adjustment by NTP */
+#if HAVE_CLOCK_GETTIME
+#ifdef CLOCK_MONOTONIC_RAW
+#define SDL_MONOTONIC_CLOCK CLOCK_MONOTONIC_RAW
+#else
+#define SDL_MONOTONIC_CLOCK CLOCK_MONOTONIC
+#endif
+#endif
+
/* The first ticks value of the application */
#if HAVE_CLOCK_GETTIME
static struct timespec start_ts;
@@ -69,7 +78,7 @@ SDL_TicksInit(void)
/* Set first ticks value */
#if HAVE_CLOCK_GETTIME
- if (clock_gettime(CLOCK_MONOTONIC, &start_ts) == 0) {
+ if (clock_gettime(SDL_MONOTONIC_CLOCK, &start_ts) == 0) {
has_monotonic_time = SDL_TRUE;
} else
#elif defined(__APPLE__)
@@ -101,7 +110,7 @@ SDL_GetTicks(void)
if (has_monotonic_time) {
#if HAVE_CLOCK_GETTIME
struct timespec now;
- clock_gettime(CLOCK_MONOTONIC, &now);
+ clock_gettime(SDL_MONOTONIC_CLOCK, &now);
ticks = (now.tv_sec - start_ts.tv_sec) * 1000 + (now.tv_nsec -
start_ts.tv_nsec) / 1000000;
#elif defined(__APPLE__)
@@ -132,7 +141,7 @@ SDL_GetPerformanceCounter(void)
#if HAVE_CLOCK_GETTIME
struct timespec now;
- clock_gettime(CLOCK_MONOTONIC, &now);
+ clock_gettime(SDL_MONOTONIC_CLOCK, &now);
ticks = now.tv_sec;
ticks *= 1000000000;
ticks += now.tv_nsec;