mutithread erro coredump

[jiudianren]

qestion1 :

thread1 add a period timer and save time_id.
thread2 is the timer thread.

afer thread2 unlock .
thread 1 use the time_id to call Timer::remove() ,
in Timer::remove , delete the time_id and set handler to nullptr,
but thread 1 is executing the handler.
the coredump happen.

lock.unlock();   
events[te.ref].handler(te.ref);
lock.lock();

what should i do to avoid the problem?

question 2:
thread1 add a period timer and save time_id.
thread2 is the timer thread.

thread 1 will call Timer::remove() in handler callback.
while the handler is executing ,it call Timer::remove, But in Timer::remove set handler to nullptr .
and so the program core dump.

	events[id].valid = false;
	events[id].handler = nullptr;

[jiudianren]

One way is to execute remove tid in the handler.