Re: Is Text_IO.Put_Line() thread-safe?

[awdorrin <awdorrin@gmail.com>]

On Thursday, June 14, 2012 9:49:45 AM UTC-4, Robert A Duff wrote:
> awdorrin writes:
> 
> > Text_IO.Put_Line( Proc_Enum'Image(thisPID)&" waiting for "& Proc_Enum'Image(waitPID));
> 
> Put_Line is not thread safe when called by multiple tasks
> on the same file.  The file here is standard output.  Standard output
> is a shared variable, so if you want to access it from multiple tasks,
> you need to synchronize.  
<snip>
> 
> - Bob

I was afraid of that... I was hoping that there would be a way to set a flag to keep the task from switching in the middle of the Put_Line.

Something like:
CriticalSection.On;
Text_IO.Put_Line("blah blah");
CriticalSection.Off;

(Thinking back to Win32 C programming days...)

I'm not that worried about the corruption in the Put_Line itself, what I'm worried about is if the corruption will go both ways, meaning could it corrupt the record array that is being sorted. (Like the text string being printed ending up in the middle of a data record.)