Re: Is cygnus multithreadability usable?

Re: Is cygnus multithreadability usable?

[Noel L Yap]

I think printf(), by definition, is not threadsafe.  The caller is responsible
for making threadsafe calls to it.

Noel




kulack@us.ibm.com on 2000.07.18 14:18:40

To:   cygwin@sourceware.cygnus.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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Re: Is cygnus multithreadability usable?

[Chris Faylor]

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@us.ibm.com on 2000.07.18 14:18:40
>
>To:   cygwin@sourceware.cygnus.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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Re: Is cygnus multithreadability usable?

[David Starks-Browning]

On Friday 14 Jul 00, Chris Faylor writes:
> On Sat, Jul 15, 2000 at 05:50:23AM +0300, -Kaatunut wrote:
> >... . FAQ said Cygwin isn'tmultithread-safe, but it also
> >said it's an obsolete entry. So what's the real status? Will multithreading
> >go down in flames?
> 
> Multithread-safe support is turned on by default in 1.1.x releases.
> 
> That does not mean that it is bug free.

I'll update this entry in the FAQ.

Regards,
David


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Re: Is cygnus multithreadability usable?

[kulack]

> 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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Re: Is cygnus multithreadability usable?

[Chris Faylor]

On Sat, Jul 15, 2000 at 05:50:23AM +0300, -Kaatunut wrote:
>I have a project that almost requires multithreading. So far I have managed
>to compile it fine under Cygwin (I develop it on RH6), but multithreading
>seems a bit of problem. FAQ said Cygwin isn'tmultithread-safe, but it also
>said it's an obsolete entry. So what's the real status? Will multithreading
>go down in flames?

Multithread-safe support is turned on by default in 1.1.x releases.

That does not mean that it is bug free.

cgf

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Is cygnus multithreadability usable?

[-Kaatunut]

I have a project that almost requires multithreading. So far I have managed
to compile it fine under Cygwin (I develop it on RH6), but multithreading
seems a bit of problem. FAQ said Cygwin isn'tmultithread-safe, but it also
said it's an obsolete entry. So what's the real status? Will multithreading
go down in flames?

 -Kaatunut



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