Re: [Boost-users] boost::thread::join causes assertion (pthreads)

From: Ben Hutchings (ben.hutchings_at_[hidden])
Date: 2005-03-24 12:53:49

Matthew Peltzer wrote:
>>Well, if anyone would care to compile and run the following program on
>>Mac OS X using pthreads, we can at least tell whether there is a
>>consistent failure:
> 
> 
> Here's what it looks it looks like with boost1_31 from fink on OS X 10.3.8:
> 
> 
>>g++ -v
> 
> Reading specs from /usr/libexec/gcc/darwin/ppc/3.3/specs
> Thread model: posix
> gcc version 3.3 20030304 (Apple Computer, Inc. build 1671)
> 
>>g++ -I/sw/include/boost-1_31 -L/sw/lib -lboost_thread-1_31 -o thread thread.cpp

It's not clear to me from this whether you linked to a debug version of 
the thread library.  In a non-debug version the assertions are disabled, 
so that wouldn't provide a useful test.

> In file included from
> /sw/include/boost-1_31/boost/type_traits/is_arithmetic.hpp:13,
>                  from
> /sw/include/boost-1_31/boost/type_traits/arithmetic_traits.hpp:14,
>                  from
> /sw/include/boost-1_31/boost/function/function_base.hpp:19,
>                  from
> /sw/include/boost-1_31/boost/function/detail/prologue.hpp:16,
>                  from /sw/include/boost-1_31/boost/function.hpp:22,
>                  from /sw/include/boost-1_31/boost/thread/thread.hpp:20,
>                  from thread.cpp:2:
> /sw/include/boost-1_31/boost/type_traits/is_float.hpp:21: warning: use of `long 
>    double' type; its size may change in a future release
> /sw/include/boost-1_31/boost/type_traits/is_float.hpp:21: warning: (Long double 
>    usage is reported only once for each file.
> /sw/include/boost-1_31/boost/type_traits/is_float.hpp:21: warning: To disable 
>    this warning, use -Wno-long-double.)
> 
>>./thread
> 
> Joining exited thread
> Joining running thread
> 
> 
> ...not sure if i'm "using pthreads" explicitly, but it all looks good to me.

"Thread model: posix" seems to imply that g++ will generate code 
suitable for pthreads, though most ports require a command-line option 
to ensure that it generates thread-safe code and uses thread-safe 
libraries.  Perhaps the Darwin port always operates in thread-safe mode.

Ben.