[Boost-users] [Interprocess] Deadlock when using interprocess_semaphore

Subject: [Boost-users] [Interprocess] Deadlock when using interprocess_semaphore
From: Derek Kivi (derek.kivi_at_[hidden])
Date: 2009-03-04 16:35:14

We are seeing a deadlock when making use of the interprocess_semaphore.

In our case we have two running threads where the first thread is stuck
waiting at a timed_wait() call while the second thread is stuck at a
post() call.

Also, a symptom we are seeing is that the lock value is set to 1 before
both threads try to acquire the lock -- we think this is why the threads
get stuck in the lock calls.

We are running 1.36 at the moment. Have there been any fixes in 1.37 or
1.38 that might help us to avoid this problem?

Thanks,
Derek

Here is what the stacks for each thread look like from the Visual C++
debugger:

Thread1
-------
Singletons.dll!boost::interprocess::scoped_lock<boost::interprocess::int
erprocess_mutex>::scoped_lock<boost::interprocess::interprocess_mutex>(b
oost::interprocess::interprocess_mutex & m={...})  Line 78 + 0x27 bytes
C++
Singletons.dll!boost::interprocess::interprocess_semaphore::timed_wait(c
onst boost::posix_time::ptime & abs_time={...})  Line 55 + 0xc bytes
C++
Singletons.dll!QSemaphoreImpl::Wait(const unsigned long
timeoutMilliseconds=1000)  Line 62 + 0xf bytes	C++
Singletons.dll!QSemaphore::Wait(const unsigned long
timeoutMilliseconds=1000)  Line 24	C++
Singletons.dll!QUtilityThread::DefaultAction(quic::HpcSharedPtr<IThread,
std::allocator> data={...})  Line 105 + 0x18 bytes	C++

Thread2
-------
ntdll.dll!7c90e4f4() 	
[Frames below may be incorrect and/or missing, no symbols loaded for
ntdll.dll]	
ntdll.dll!7c90d1fc() 	
kernel32.dll!7c8023f1() 	
kernel32.dll!7c802455() 	
Singletons.dll!boost::interprocess::winapi::sched_yield()  Line 281 +
0xe bytes	C++
Singletons.dll!boost::interprocess::detail::thread_yield()  Line 51 +
0x8 bytes	C++
Singletons.dll!boost::interprocess::interprocess_mutex::lock()  Line 40
C++
Singletons.dll!boost::interprocess::interprocess_condition::notify(unsig
ned long command=1)  Line 50	C++
Singletons.dll!boost::interprocess::interprocess_condition::notify_one()
Line 33	C++
Singletons.dll!boost::interprocess::interprocess_semaphore::post()  Line
31	C++
Singletons.dll!QSemaphoreImpl::Post()  Line 45	C++
Singletons.dll!QSemaphore::Post()  Line 18	C++
Singletons.dll!QUtilityThread::RegisterTask(IBackgroundTask *
pBackgroundTask=0x01002660)  Line 54	C++

-- 
Derek Kivi
Senior Software Developer
QuIC Financial Technologies Inc. 
Office: [phone] 
Mobile: [phone] 
derek.kivi_at_[hidden]
Risk. Managed.
www.quic.com 
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