blob: c626536a0367c2d1521342f3ecf7b8ca0791d194 [file] [log] [blame]
#include <chrono>
#include <phosphor-logging/log.hpp>
#include "timer.hpp"
namespace phosphor
{
namespace ipmi
{
using namespace phosphor::logging;
// Initializes the timer object
void Timer::initialize()
{
// This can not be called more than once.
if (eventSource)
{
throw std::runtime_error("Timer already initialized");
}
// Add infinite expiration time
auto r = sd_event_add_time(timeEvent, &eventSource,
CLOCK_MONOTONIC, // Time base
UINT64_MAX, // Expire time - way long time
0, // Use default event accuracy
timeoutHandler, // Callback handler on timeout
this); // User data
if (r < 0)
{
log<level::ERR>("Failure to set initial expiration time value",
entry("ERROR=%s", strerror(-r)));
throw std::runtime_error("Timer initialization failed");
}
// Disable the timer for now
r = setTimer(SD_EVENT_OFF);
if (r < 0)
{
log<level::ERR>("Failure to disable timer",
entry("ERROR=%s", strerror(-r)));
throw std::runtime_error("Disabling the timer failed");
}
return;
}
/** @brief callback handler on timeout */
int Timer::timeoutHandler(sd_event_source* eventSource,
uint64_t usec, void* userData)
{
auto timer = static_cast<Timer*>(userData);
timer->expired = true;
log<level::INFO>("Timer expired");
return 0;
}
// Gets the time from steady_clock
std::chrono::microseconds Timer::getTime()
{
using namespace std::chrono;
auto usec = steady_clock::now().time_since_epoch();
return duration_cast<microseconds>(usec);
}
// Enables or disables the timer
int Timer::setTimer(int action)
{
return sd_event_source_set_enabled(eventSource, action);
}
// Sets the time and arms the timer
int Timer::startTimer(std::chrono::microseconds timeValue)
{
// Disable the timer
setTimer(SD_EVENT_OFF);
// Get the current MONOTONIC time and add the delta
auto expireTime = getTime() + timeValue;
// Set the time
auto r = sd_event_source_set_time(eventSource, expireTime.count());
if (r < 0)
{
log<level::ERR>("Failure to set timer",
entry("ERROR=%s", strerror(-r)));
return r;
}
// A ONESHOT timer means that when the timer goes off,
// its moves to disabled state.
r = setTimer(SD_EVENT_ONESHOT);
if (r < 0)
{
log<level::ERR>("Failure to start timer",
entry("ERROR=%s", strerror(-r)));
}
return r;
}
} // namespace ipmi
} // namespace phosphor