https://svn.boost.org/trac10/ticket/10720 <p> boost::interprocess names the mutexes and semaphores using the sync_id and sync_handles classes found in interprocess/sync/windows/sync_utils.hpp. The sync_id class uses winapi::query_performance_counter to obtain a value which is then used to create a supposedly unique identifier for the semaphore or mutex in sync_handles::fill_name. </p> <p> The problem is that when multiple mutexes and/or semaphores are created within such a short time frame that the value returned by winapi::query_performance_counter does not change, the creation fails with winapi::error_already_exists. </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/10720 Trac 1.4.3