This reverts commit 2d33c20231 and
reapplies various patches for memory leaks.
The reason for the revert was a bug for a maximum duration interval
which caused sleep_for() to cause unpredictable behavior.
In the previous fix for a passed max duration, the assumption was made
that at maximum one second will pass between the duration assignment and
the std::condition_variable::sleep_for() call.
This implementation makes the behavior more predictable by using
sleep_until() instead to emulate the sleep_for() behavior.
The standard library has the implicit requirement that for
std::condition_variable::sleep_for() the duration must not cause an
overflow if added to the current time.
This commit will reduce the duration accordingly to fit into the
duration type.
This keeps the function consistent with sleep_until() and sleep_for()
which both can be interrupted.
This is relevant to allow an update via a "signal" without an "interval"
in a custom module.
Tamino Bauknecht