[Lazarus] Signal handling

[Mark Morgan Lloyd]

Mark Morgan Lloyd wrote:
>> If I want to poll a variable set by an asynchronous unix-style signal, 
>> i.e. that doesn't have an OS-level handle and where the latency should 
>> probably be of the order of 100mSec, what's the most effective technique?

 > If I understand correctly, the self pipe trick is probably best, then
 > you don't have to poll, just add the handle to select().

But there's no handle, simply a (global) variable. This continues from 
an earlier discussion where Sven was cautioning that about the only 
thing you could do safely in a signal handler was set a (global) 
variable: that bit I knew, but I don't know how best to deal with the 
variable once set if there's no convenient timer etc. (I should have 
threaded the question onto that, but I thought it was on a different list).

-- 
Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

[Opinions above are the author's, not those of his employers or colleagues]