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libcamera: timer: Add start() method with absolute deadline

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The Timer class is started using a timer duration. To help callers that
require waiting for an absolute deadline, add a start() overload that
takes a std::chrono::steady_clock::time_point value. This will be used
by IPAs.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
This commit is contained in:
Laurent Pinchart
2019-10-06 06:42:09 +03:00
parent ada18bf65a
commit 9d250417a2
2 changed files with 20 additions and 3 deletions
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22
src/libcamera/timer.cpp
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@@ -37,6 +37,11 @@ LOG_DEFINE_CATEGORY(Timer)
* stop(), and once it times out or is stopped, can be started again with
* start().
*
* The timer deadline is specified as either a duration in milliseconds or an
* absolute time point. If the deadline is set to the current time or to the
* past, the timer will time out immediately when execution returns to the
* event loop of the timer's thread.
*
* Timers run in the thread they belong to, and thus emit the \a ref timeout
* signal from that thread. To avoid race conditions they must not be started
* or stopped from a different thread, attempts to do so will be rejected and
@@ -74,17 +79,28 @@ Timer::~Timer()
* the timer is already running it will be stopped and restarted.
*/
void Timer::start(std::chrono::milliseconds duration)
{
start(utils::clock::now() + duration);
}
/**
* \brief Start or restart the timer with a \a deadline
* \param[in] deadline The timer deadline
*
* This method shall be called from the thread the timer is associated with. If
* the timer is already running it will be stopped and restarted.
*/
void Timer::start(std::chrono::steady_clock::time_point deadline)
{
if (Thread::current() != thread()) {
LOG(Timer, Error) << "Timer can't be started from another thread";
return;
}
deadline_ = utils::clock::now() + duration;
deadline_ = deadline;
LOG(Timer, Debug)
<< "Starting timer " << this << " with duration "
<< duration.count() << ": deadline "
<< "Starting timer " << this << ": deadline "
<< utils::time_point_to_string(deadline_);
if (isRunning())