timer.md

timer

Class

timer

Description

Implements a timeout mechanism. Usage is as following:

timer myTimer(5);     // 5 sec

.. if (timedOut(myTimer)) { // timed out } else { // do something possible blocking }

Constructor set signal handler on sigalarm and alarm(). Destructor clears these.

timedOut is macro because setjmp can't be in member function of timer. ?something to do with stack frames.

WARNING: setjmp restores complete register state so including local vars held in regs. So if in blocking part something gets calced in a stack based variable make sure it is declared 'volatile'.

SourceFiles

timer.C