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From:	Chris Faylor <cgf AT cygnus DOT com>
Date:	Tue, 18 Jul 2000 15:18:57 -0400
To:	Cygwin AT Sourceware DOT Cygnus DOT Com
Subject:	Re: Is cygnus multithreadability usable?
Message-ID:	<20000718151857.E26695@cygnus.com>
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In-Reply-To:	<85256920.0066081D.00@nyc-ntgw-n01.ny.jpmorgan.com>; from yap_noel@jpmorgan.com on Tue, Jul 18, 2000 at 02:34:31PM -0400

On Tue, Jul 18, 2000 at 02:34:31PM -0400, Noel L Yap wrote:
>I think printf(), by definition, is not threadsafe.  The caller is responsible
>for making threadsafe calls to it.

Right.

cgf

>kulack AT us DOT ibm DOT com on 2000.07.18 14:18:40
>
>To:   cygwin AT sourceware DOT cygnus DOT com
>cc:   (bcc: Noel L Yap)
>Subject:  Re: Is cygnus multithreadability usable?
>
>> Multithread-safe support is turned on by default in 1.1.x releases.
>> That does not mean that it is bug free.
>> cgf
>Interesting. I was using just a minimal amound of C runtime stuff (mainly
>printf), and noticed thread safety problems so I just assumed it wasn't
>safe. For my projects, it didn't matter much, but now that you mention the
>above, it might just be a simple bug.
>
>Thread 1:
>printf("abc\n");
>
>Thread 2:
>printf("xyz\n")
>
>Frequently results in the newlines intermingling:
><abcxyz
>
>>
>On one occasion I believe that the output was more mixed than that, but I
>could be making that up... 8-)

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