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libtest: Improve T_now_tick()

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The T_now_tick() is a fall back time measurement using the CPU counter
in case no Clock Driver is configured.  Some CPU counter may overflow
during the test execution.  Accumulate the elapsed time to reduce the
chance of CPU counter overflows.
This commit is contained in:
Sebastian Huber
2021-09-17 09:30:44 +02:00
parent cd198a5511
commit a6636d9957
1 changed files with 45 additions and 0 deletions
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45
cpukit/libtest/t-test-time.c
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@@ -35,6 +35,7 @@
#include <time.h>
#ifdef __rtems__
#include <rtems.h>
#include <rtems/counter.h>
#include <rtems/score/timecounter.h>
#endif
@@ -231,8 +232,52 @@ T_now_dummy(void)
memory_order_relaxed);
}
#ifndef __rtems__
T_time
T_now_tick(void)
{
return T_ticks_to_time(T_tick());
}
#else /* __rtems__ */
#if defined(RTEMS_SMP)
static rtems_interrupt_lock T_time_lock =
RTEMS_INTERRUPT_LOCK_INITIALIZER("Test Time Lock");
#endif
static T_ticks T_tick_last;
static T_time T_tick_time;
static bool T_tick_initialized;
T_time
T_now_tick(void)
{
rtems_interrupt_lock_context lock_context;
T_ticks ticks;
T_time now;
ticks = T_tick();
rtems_interrupt_lock_acquire(&T_time_lock, &lock_context);
if (T_tick_initialized) {
T_ticks last;
last = T_tick_last;
T_tick_last = ticks;
now = T_tick_time;
now += T_ticks_to_time(ticks - last);
T_tick_time = now;
} else {
T_tick_initialized = true;
T_tick_last = ticks;
now = 0;
}
rtems_interrupt_lock_release(&T_time_lock, &lock_context);
return now;
}
#endif /* __rtems__ */