Implement regular event launching using systemd event loop

[apps/low-level-can-service.git] / src / utils / timer.cpp

diff --git a/src/utils/timer.cpp b/src/utils/timer.cpp
index 8dec706..9d385fe 100644 (file)
--- a/src/utils/timer.cpp
+++ b/src/utils/timer.cpp
@@ -15,17 +15,89 @@
  * limitations under the License.
  */
 
-#include "utils/timer.hpp"
+#include <time.h>
+#include <stdlib.h> 
 
-long long int systemTimeMs()
+#include "timer.hpp"
+
+#define MS_PER_SECOND 1000
+
+long long int system_time_us()
+{
+       struct timespec t_usec;
+       long long int timestamp_usec;
+       
+       if(!::clock_gettime(CLOCK_MONOTONIC, &t_usec))
+               timestamp_usec = (t_usec.tv_nsec / 1000ll) + (t_usec.tv_sec* 1000000ll);
+       return timestamp_usec;
+}
+
+long long int system_time_ms()
 {
-       struct timeb t_msec;
+       struct timespec t_msec;
        long long int timestamp_msec;
        
-       if(!::ftime(&t_msec))
-       {
-               timestamp_msec = (t_msec.time) * 1000ll + 
-                       t_msec.millitm;
-       }
+       if(!::clock_gettime(CLOCK_MONOTONIC, &t_msec))
+               timestamp_msec = (t_msec.tv_nsec / 1000000ll) + (t_msec.tv_sec* 1000ll);
        return timestamp_msec;
+}
+
+long long int system_time_s()
+{
+       struct timespec t_sec;
+       long long int timestamp_sec;
+       
+       if(!::clock_gettime(CLOCK_MONOTONIC, &t_sec))
+               timestamp_sec = t_sec.tv_sec;
+       return timestamp_sec;
+}
+
+frequency_clock_t::frequency_clock_t()
+       : frequency_{10.0}, last_tick_{0}, time_function_{nullptr}
+{}
+
+
+frequency_clock_t::frequency_clock_t(float frequency)
+       : frequency_{frequency}, last_tick_{0}, time_function_{nullptr}
+{}
+
+/// @brief Return the period in ms given the frequency in hertz.
+float frequency_clock_t::frequency_to_period(float frequency)
+{
+       return 1 / frequency * MS_PER_SECOND;
+}
+
+bool frequency_clock_t::started()
+{
+       return last_tick_ != 0;
+}
+
+time_function_t frequency_clock_t::get_time_function()
+{
+       return time_function_ != nullptr ? time_function_ : system_time_ms;
+}
+
+bool frequency_clock_t::elapsed(bool stagger)
+{
+       float period = frequency_to_period(frequency_);
+       float elapsed_time = 0;
+       if(!started() && stagger)
+               last_tick_ = get_time_function()() - (rand() % int(period));
+       else
+               // Make sure it ticks the the first call
+               elapsed_time = !started() ? period : get_time_function()() - last_tick_;
+
+       return frequency_ == 0 || elapsed_time >= period;
+}
+
+float frequency_clock_t::get_frequency() const
+{
+       return frequency_;
+}
+
+/// @brief Force the clock to tick, regardless of it its time has actually
+/// elapsed.
+void frequency_clock_t::tick()
+{
+       last_tick_ = get_time_function()();
 }
\ No newline at end of file