[boost] Re: Boost Thread - Read Write Mutex Problem

From: Tanguy Fautre (tanguy.fautre_at_[hidden])
Date: 2005-01-11 07:32:12

Hi,

I suffer from the same bug in one of my projects, which keeps the 
program from running.
I also tested the code posted by David, and as he said the program never 
reaches "After".

I'm using libboost 1.32.0-2 on Debian GNU/Linux.

PS: I haven't seen any entry for this in the boost bug tracking system 
yet. Maybe one ought to be created?

Regards,

Tanguy

Michael Glassford wrote:
> Just wanted to let you know: unfortunately, I won't be able to look at 
> this until at least this weekend. If anyone else wants to volunteer, 
> help would be welcome.
> 
> Mike
> 
> 
> "David Brownell" <david_brownell_at_[hidden]> wrote in message 
> news:BAY101-DAV107F654EE1B22D622CD3CEEDBF0_at_phx.gbl...
> 
>>When running the simple program listed below, the scoped_read_lock 
>>appears
>>to never acquire a read lock on the mutex and, as a result, the 
>>program
>>never finishes.  In looking through the documentation, I don't think 
>>there
>>is anything additional I need to do and was a bit surprised that 
>>this didn't
>>work.
>>
>>Here is the code:
>>
>>boost::read_write_mutex
>>m(static_cast<boost::read_write_scheduling_policy::read_write_scheduling_pol
>>icy_enum>(alternating_many_reads));
>>
>>   std::cout << "Before\n";
>>   {
>>       boost::read_write_mutex::scoped_write_lock  l(m);
>>   }
>>   std::cout << "Middle\n";
>>   {
>>       boost::read_write_mutex::scoped_read_lock   l(m);
>>   }
>>   std::cout << "After\n";
>>
>>
>>And some more details:
>>- Windows XP SP2
>>- Microsoft Visual Studio 2003
>>- I am compiling with the Multithreaded DLL version of the CRT, so
>>boost_thread-vc71-mt-gd-1_32.lib is being used
>>- test_read_write_mutex.cpp completed without problems
>>- writer_priority and reader_priority completed without problems. 
>>Only
>>alternating_many_reads and alternating_single_read seem to have 
>>problems.
>>
>>Thanks for your help!
>>David Brownell