NAME
find_call_out() - find a call out scheduled to be called next
SYNOPSIS
int find_call_out(string func):
DESCRIPTION
Find the first call out due to be executed for function `func', and
return the time left. If it is not found, then return -1.
SEE ALSO
call_out(3)
, remove_call_out(3)
, set_heart_beat(3)
.