* Fixed try_unlock_shared_and_lock_until/for() and
try_unlock_shared_and_lock_upgrade_until/for() so that they wait on the
correct condition variable for the associated predicate.
* Fixed try_unlock_shared_and_lock_until/for() and
try_unlock_upgrade_and_lock_until/for() so that they take the
write_entered_ flag before waiting for all shared readers to unlock. This
prevents new readers from taking a shared lock or new writers from taking
the exclusive lock while these functions are waiting to take the
exclusive lock.
* Changed notify_all() calls to occur while the mutex is being held to be
consistent with the notify_one() calls and the existing
pthread/shared_mutex.hpp implementation.
* Added BOOST_THREAD_PROVIDES_SHARED_MUTEX_UPWARDS_CONVERSIONS ifdefs.
* Added BOOST_ASSERT() statements to verify correct usage and operation.
* Fixed an incorrect test case that the BOOST_ASSERT() statements
uncovered.
* Added comments to explain certain design decisions.
* Added checks for BOOST_THREAD_USES_CHRONO
* Rearranged the order of the functions in v2/shared_mutex.hpp
* No changes were made to the contents of any functions
* Also added comments to the win32 mutex implementations to clarify
how the existing code works
* Also removed a few unnecessary intermediate variables
* Used the predicate version of condition_variable::wait_until() which
correctly handles time jump events.
* Fixed an issue with sync_timed_queue::pull_until()/pull_for() where
they could incorrectly return queue_op_status::timeout instead of
queue_op_status::success.
* Changed sync_timed_queue::wait_pull() to return
queue_op_status::success instead of queue_op_status::closed when the
queue has been closed but an item is available and is ready to be
pulled off the queue.
* Changed sync_priority_queue::pull_until()/pull_for() and
sync_timed_queue::pull_until()/pull_for() to return
queue_op_status::closed instead of throwing an exception when the
queue is closed since they have a queue_op_status return type.
- Added no_interruption_point::sleep() functions to pthreads to be
consistent with Windows.
- Fixed an issue where the no_interruption_point::sleep_*() functions
were still interruptible on Windows.
- This allowed these classes to take advantage of the time jump fixes in condition_variable.
Fixed a minor issue where, if a thread was waiting after calling one of the following functions and it timed out at the same time it was given the lock, it would return false (failure) rather than succeeding.
- mutex::timed_lock()
- mutex::try_lock_for()
- mutex::try_lock_until()
- recursive_mutex::timed_lock()
- recursive_mutex::try_lock_for()
- recursive_mutex::try_lock_until()
- shared_mutex::timed_lock_shared()
- shared_mutex::try_lock_shared_for()
- shared_mutex::try_lock_shared_until()
