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clock: add testing for 32-bit overflow of 64-bit system timer

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This commit is contained in:
Jussi Kivilinna
2017-04-21 08:55:07 -06:00
committed by Gregory Nutt
parent c57d49f420
commit 33ddaa0b10
1 changed files with 42 additions and 2 deletions
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sched/clock/clock_initialize.c
+42 -2
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@@ -68,6 +68,18 @@
#define SEC_PER_HOUR ((time_t)60 * SEC_PER_MIN)
#define SEC_PER_DAY ((time_t)24 * SEC_PER_HOUR)
#if defined(CONFIG_DEBUG_FEATURES) && defined(CONFIG_SYSTEM_TIME64)
/* Initial system timer ticks value close to maximum 32-bit value, to test
* 64-bit system-timer after going over 32-bit value. This is to make errors
* of casting 64-bit system-timer to 32-bit variables more visible.
*/
# define INITIAL_SYSTEM_TIMER_TICKS \
((uint64_t)(UINT32_MAX - (TICK_PER_SEC * 5)))
#else
# define INITIAL_SYSTEM_TIMER_TICKS 0
#endif
/****************************************************************************
* Public Data
****************************************************************************/
@@ -192,8 +204,36 @@ static void clock_inittime(void)
clock_basetime(&g_basetime);
#endif
#ifndef CONFIG_SCHED_TICKLESS
g_system_timer = 0;
#endif
g_system_timer = INITIAL_SYSTEM_TIMER_TICKS;
if (g_system_timer > 0)
{
struct timespec ts;
(void)clock_ticks2time((ssystime_t)g_system_timer, &ts);
/* Adjust base time to hide initial timer ticks. */
g_basetime.tv_sec -= ts.tv_sec;
g_basetime.tv_nsec -= ts.tv_nsec;
while (g_basetime.tv_nsec < 0)
{
g_basetime.tv_nsec += NSEC_PER_SEC;
g_basetime.tv_sec--;
}
#ifdef CONFIG_CLOCK_MONOTONIC
/* Adjust monotonic clock offset to hide initial timer ticks. */
g_monotonic_basetime.tv_sec -= ts.tv_sec;
g_monotonic_basetime.tv_nsec -= ts.tv_nsec;
while (g_monotonic_basetime.tv_nsec < 0)
{
g_monotonic_basetime.tv_nsec += NSEC_PER_SEC;
g_monotonic_basetime.tv_sec--;
}
#endif /* CONFIG_CLOCK_MONOTONIC */
}
#endif /* !CONFIG_SCHED_TICKLESS */
#else
clock_inittimekeeping();
#endif