Multiprocessor Issue

[Andrew Pollard]

On Fri, Jun 14, 2002 at 03:12:30PM +0530, Ritesh Noronha wrote:
>> Hi,
>> 
>> OPERATING SYSTEM : SunOS ultra2-solaris 5.8 Generic sun4u sparc
>> SUNW,Ultra-2
>> C++ COMPILER     : gcc version 3.0.3[precomiled binary from
>> sunfreeware].
>> HARDWARE         : Multiprocessor [2cpus]
>> THREADING        : PTHREADS
>> 
>> problem: 
>> We have built an appilcation which run very smoothly on sun solaris
>> with a single cpu. when we run it on a multiprocessor machine it core
>> dumps.
>> 
>> On a multiprocessor machine it core dumps regularly in libstdc++
>> allocator.....
>> 
>> It works on a multiprocessor when we use the pbind utility to bind it
>> to a cpu.

Nathan Myers replied:

>Yes.  It's fixed in gcc-3.0.4, IIRC.  It was a bug in the bits/atomicity.h
>header file, where two functions that were supposed to share a lock
>instead each had its own lock.

It still may cause crashes. See libstdc++/5432 for details.

It has been fixed for gcc-3.1, but the patch never made it into the
gcc-3_0-branch.

Andrew.
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