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timer.cpp
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timer.cpp
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#include <chrono>
#include <phosphor-logging/log.hpp>
#include <phosphor-logging/elog-errors.hpp>
#include "timer.hpp"
#include "xyz/openbmc_project/Common/error.hpp"
namespace phosphor
{
namespace network
{
using namespace phosphor::logging;
using namespace sdbusplus::xyz::openbmc_project::Common::Error;
// Initializes the timer object
void Timer::initialize()
{
// This can not be called more than once.
if (eventSource)
{
log<level::ERR>("Timer already initialized");
elog<InternalFailure>();
}
auto r = sd_event_default(&timeEvent);
if (r < 0)
{
log<level::ERR>("Failure in creating the sd_event",
entry("ERROR=%d", r));
elog<InternalFailure>();
}
// Add infinite expiration time
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=%d", r));
elog<InternalFailure>();
}
// Disable the timer for now
r = setTimer(SD_EVENT_OFF);
if (r < 0)
{
log<level::ERR>("Failure to disable timer",
entry("ERROR=%d", r));
elog<InternalFailure>();
}
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;
// Call optional user call back function if available
if (timer->userCallBack)
{
timer->userCallBack();
}
sd_event_source_set_enabled(eventSource, SD_EVENT_OFF);
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);
expired = false;
// 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=%d", r));
elog<InternalFailure>();
}
// 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=%d", r));
elog<InternalFailure>();
}
return r;
}
} // namespace network
} // namespace phosphor