Method and apparatus to provide concurrency control over objects without atomic operations on non-shared objects

摘要

A lock is implemented by assigning the lock to a thread that creates the associated object. The "owning thread" can thereafter acquire and release the lock without any atomic operations. If another thread attempts to acquire the lock, the non-owning thread sends a message to the owning thread, requesting permission to acquire the lock. At some point, the owning thread receives the message from the non-owning thread and changes the state of the lock such that future lock/unlock operations use atomic operations that support object sharing.