Hello,
On 29/07/2015 12:00, fpc-pascal-requ...@lists.freepascal.org wrote:
A counting, or general, semaphore limits simultaneous access to a
resource according to the number of permits you specify. On the other
hand, a binary semaphore like a critical section limits the access to
"one at a time"
On 07/29/2015 12:35 PM, Serguei TARASSOV wrote:
In general, semaphores are inter-process but critical sections are not.
Hmmm I suppose this is "fpc speak".
The "really general" term "semaphore" denotes a kind of for
synchronizing means for multiple execution streams, be that Threads or
tasks
Hi all,
@Serguei Thanks for your reply. What you write is probably right, but
let me explain the problem.
In an application you have N number of threads and they all want to
access a service. Now, for example, only five threads are allowed to
have access at the same time. I believe this is a
On 07/29/2015 01:10 PM, kapibara wrote:
In an application you have N number of threads and they all want to
access a service. Now, for example, only five threads are allowed to
have access at the same time. ..
I suppose that easily can be made by two critical sections.
One is used to protec
On Tuesday 28 July 2015 20:07:52 kapibara wrote:
>
> FPC doesn't seem to have a general semaphore? I recently attempted to
> implement one, here is the code, plus a working Lazarus demo attached.
MSEgui also has a semaphore implementation, please see sys_sem*() functions in
lib/kernel/windows/mse
Am 29.07.2015 12:36 schrieb "Serguei TARASSOV" :
>
> Hello,
>
> On 29/07/2015 12:00, fpc-pascal-requ...@lists.freepascal.org wrote:
>>
>> A counting, or general, semaphore limits simultaneous access to a
>> resource according to the number of permits you specify. On the other
>> hand, a binary sema
Am 28.07.2015 20:14 schrieb "kapibara" :
>
> Hi there,
>
> A counting, or general, semaphore limits simultaneous access to a
resource according to the number of permits you specify. On the other hand,
a binary semaphore like a critical section limits the access to "one at a
time".
>
> FPC doesn't s
Hi all,
The problem is not very serious, but I point it out here because no bug
tracker category seems appropriate.
In the header of the pages of bug tracker the Community button is a dead
link to http://community.freepascal.org:1/.
Regards.
___
fp
On Wed, 29 Jul 2015, Yann Mérignac wrote:
Hi all,
The problem is not very serious, but I point it out here because no bug
tracker category seems appropriate.
In the header of the pages of bug tracker the Community button is a dead
link to http://community.freepascal.org:1/.
The communi
On 29/07/2015 15:44, fpc-pascal-requ...@lists.freepascal.org wrote:
Date: Wed, 29 Jul 2015 15:16:13 +0200
From: Sven Barth
To: FPC-Pascal users discussions
Subject: Re: [fpc-pascal] Counting semaphore for free pascal
Message-ID:
Content-Type: text/plain; charset="utf-8"
Semaphores don'
On 29/07/2015 15:44, fpc-pascal-requ...@lists.freepascal.org wrote:
Date: Wed, 29 Jul 2015 13:10:23 +0200
From: kapibara
To:fpc-pascal@lists.freepascal.org
Subject: Re: [fpc-pascal] Counting semaphore for free pascal
Message-ID:<55b8b49f.1070...@aol.com>
Content-Type: text/plain; charset=windows-
On 07/29/2015 04:47 PM, Serguei TARASSOV wrote:
I see you're using two concepts of synchronization (semaphore and
events) at the same time.
Maybe better to separate them?
It is not clear why use events to limit thread access to service.
There are several implementation details a semaphore ca
Hello,
I'd like fpcanvas to support alpha-blending while drawing for example
polygons, and I wonder what the best way would be.
Maybe a new property AlphaBlend: Boolean to both TFPCustomBrush and
TFPCustomPen?
Pen has Mode, which could have a new mode for alphablend, although I'm
not sure if thi
On Wed, 29 Jul 2015, Felipe Monteiro de Carvalho wrote:
Hello,
I'd like fpcanvas to support alpha-blending while drawing for example
polygons, and I wonder what the best way would be.
Maybe a new property AlphaBlend: Boolean to both TFPCustomBrush and
TFPCustomPen?
Pen has Mode, which could
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