I previously posted about issues when using a recursive_mutex and a condition. after some more inspection, it turns out it is a minor bug in the recursive_mutex implementation (the pthread version). I've included the patch below, which was generated against the 1.31.0 version of boost (but the bug is still in the latest cvs as well). Would be great if someone could integrate this into the latest code, or possibly a bug fix release for 1.31 (this is a major bug for anyone using recursive_mutex with condition). thanks, -james *** boost_1_31_0/libs/thread/src/recursive_mutex.cpp Fri Dec 26 18:22:00 2003 --- boost_1_31_0.jta/libs/thread/src/recursive_mutex.cpp Thu Sep 16 10:01:10 2004 *************** *** 412,417 **** --- 412,418 ---- state.pmutex = &m_mutex; state.count = m_count; + m_count = 0; } recursive_try_mutex::recursive_try_mutex() *************** *** 608,613 **** --- 609,615 ---- state.pmutex = &m_mutex; state.count = m_count; + m_count = 0; } recursive_timed_mutex::recursive_timed_mutex() *************** *** 787,792 **** --- 789,795 ---- state.pmutex = &m_mutex; state.count = m_count; + m_count = 0; } #elif defined(BOOST_HAS_MPTASKS)