[Boost-users] [thread] assertion error in timed_lock

Subject: [Boost-users] [thread] assertion error in timed_lock
From: Ernst Murnleitner (mur_at_[hidden])
Date: 2009-01-11 08:00:34

Hello,

Sometimes - especially if I start the program with valgrind - my program exits
with

/usr/include/boost/thread/pthread/recursive_mutex.hpp:180: bool
boost::recursive_timed_mutex::timed_lock(const boost::system_time&): Assertion
`!res || res==16' failed.

The line 180 is in this function:

 bool timed_lock(system_time const & abs_time)
        {
            struct timespec const timeout=detail::get_timespec(abs_time);
            int const res=pthread_mutex_timedlock(&m,&timeout);
            BOOST_ASSERT(!res || res==EBUSY);
            return !res;
        }

pthread_mutex_timedlock returned ETIMEDOUT. 

Can the BOOST_ASSERT be changed that it only logs a warning? In a production
environment it is not nice, if the program exits. 

In the man page of pthread_mutex_timedlock I read:

-----

...
The pthread_mutex_timedlock() function shall fail if:

       EINVAL The mutex was created with the protocol attribute having the value
PTHREAD_PRIO_PROTECT and the calling thread's  priority  is  higher
              than the mutex' current priority ceiling.

       EINVAL The  process or thread would have blocked, and the abs_timeout
parameter specified a nanoseconds field value less than zero or greater
              than or equal to 1000 million.

       ETIMEDOUT
              The mutex could not be locked before the specified timeout
expired.
...
------

Isn't ETIMEDOUT a return value which has to be expected?

Greetings, 

Ernst