Re: [Log4cpp-devel] multithread question

[Emiliano M. <emi...@te...>]

Hi:

I'd like the idea, and i have done. This is a a Pthread implementation. 
I've tested with a multithreaded
program that i'm developing and seems to be ok, i expect it's ok with 
the philosofpy of log4cpp.
Any suggestion or thing you think must be changed, tell me please.
I expect new version be soon released.

Regards,

Emiliano Martín


Bastiaan Bakker wrote:

>Hi Emiliano,
>
>log4cpp 0.2.x does not explicitly support multithreading.
>But with some restrictions it still can be used in a multithreading
>environment:
>* don't change your logging configuration when you have multiple threads
>running. In most cases you'll setup your Category hierarchy before the
>application starts logging anyway, so this is not a large problem. Calls
>to setPriority() are still permitted.
>* The append function must be atomic. Log4cpp's appenders have been
>written in a way that requires only 1 call to the underlying system to
>write a log message (i.e. a single write() for the FileAppender). If
>your OS handles this atomically, the logfile will be OK. Otherwise you
>could end up with intertwined log messages. The latter appears to be the
>case at least with OstreamAppender on Win32 platforms.
>
>If you want to have full MT support, you'll be happy to know that as of
>version 0.3.0 log4cpp includes code for multithreading. Currently
>(release 0.3.2rc1) it supports Omnithreads and Win32 threads, but
>support for POSIX threads should not be too difficult to add: it
>requires an adapter implementation for a simple Mutex, ScopedLock and
>ThreadLocalData. You're very welcome to help in this area, if you like.
>
>Regards,
>
>Bastiaan Bakker
>LifeLine Networks bv
>  
>
>On Tue, 2002-06-18 at 18:05, Emiliano Martin wrote:
>  
>
>>Hi:
>>
>>I've read log4ccp does not suppport multithreading,  can i do something 
>>like this to assure atomic access¿¿
>>or it's very restrictive?? (or stupid)
>>
>>
>>void Category::_logUnconditionally(Priority::Value priority,
>>                                      const char* format,
>>                                      va_list arguments) throw() {
>>       OstringStream messageBuffer;
>>
>>       pthread_mutex_lock(writeMutex);
>>       messageBuffer.vform(format, arguments);
>>       _logUnconditionally2(priority, messageBuffer.str());
>>       pthread_mutex_unlock(writeMutex);
>>   }
>>           
>>thanks in advance
>>
>>
>>----------------------------------------------------------------------------
>>                   Bringing you mounds of caffeinated joy
>>                      >>>     http://thinkgeek.com/sf    <<<
>>
>>_______________________________________________
>>Log4cpp-devel mailing list
>>Log...@li...
>>https://lists.sourceforge.net/lists/listinfo/log4cpp-devel
>>    
>>
>
>
>
>  
>