Subj : Re: localtime in Solaris 9 is not thread safe?
To   : comp.programming.threads
From : Dragan Cvetkovic
Date : Tue Mar 08 2005 08:52 am

Thomas Mueller <tmueller@thmu.de> writes:

> On Tue, 08 Mar 2005 13:36:26 +0800, Franklin Li wrote:
>
>> 
>> I'm doing pthread(C++) programming in Solaris 9 and find that localtime is
>> not thread safe. Is it true?
>>
>> [...pstack dump snipped...]
>> 
>> Is there solution for this?
>> 
>
> Since localtime() is not reentrant it may well be that it is not
> thread-safe. Try using localtime_r() instead.

Man page for localtime(3C) on Solaris 10 has the following information in it:

     The asctime(), ctime(), gmtime(), and localtime()  functions
     are  safe  to  use  in multithread applications because they
     employ  thread-specific  data.   However,   their   use   is
     discouraged  because  standards  do  not  require them to be
     thread-safe. 

However, the corresponding man page on Solaris 9 says explicitly:

     The asctime(), ctime(), gmtime(), and localtime()  functions
     are unsafe in multithread applications.  The asctime_r() and
     gmtime_r()   functions   are   MT-Safe. 

So, upgrade to Solaris 10 :-)

Dragan

-- 
Dragan Cvetkovic, 

To be or not to be is true. G. Boole      No it isn't.  L. E. J. Brouwer

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