[Lazarus] Weird object variables access - fpc issue?
el.es.cr at gmail.com
Tue Oct 24 10:48:56 CEST 2017
On 24/10/17 09:11, Mattias Gaertner via Lazarus wrote:
> On Tue, 24 Oct 2017 08:59:36 +0100
> el es via Lazarus <lazarus at lists.lazarus-ide.org> wrote:
>> until not ThreadNowInUse; //
>> ThreadNowInUse :=true;
> This is not thread safe.
Because separated by 'try' ?
I see; Will it be enough to put it like
until not ThreadNowInUse;
ThreadNowInUse := true;
I haven't ran into problems with my routine yet,
but I wasn't really calling it in a very 'tight loop'
(as it is used for timing/'profiling' the calls to hardware 'master node' routines
and for deciding whether the thread should go to sleep; so there is always ample time
between calls to ThreadNow() and it's only called in context of the thread; so the
'poor mans semaphore' isn't really that required - it's just a safeguard)
(probably if I need timing measurements, every other type of thread I
will ever define, will have their own ThreadNow call)
I realize I could just use 'naked' GetSystemTime + SystemTimeToDateTime pair with a local variable;
or define the above pair as a nested function in the thread, that'll serialize it enough...
Anyone ever thought of a thread-safe global Now() call ?
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