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A method and apparatus is described where given a system comprised of multiple threads interrupt delivery to an executing thread is delayed for a specified amount of time if that thread is holding a lock.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
51% of the total text.
Page 1 of 1
Hardware Lock Windows
Disclosed is a system that monitors lock and unlock requests issued by software threads and enables the delay of external and timer interrupts when the thread to be interrupted is currently holding a lock. In systems, such as real time systems and database systems, lock hold times are typically short. Interrupting and context switching threads while they are holding locks can lead to substantially longer lock hold times. Long lock times can result in other threads spinning for lock acquisition while the thread holding the lock is not even dispatched and consequently this can result in unnecessary wasted cpu cycles. Yet in other systems, where lock holders can be identified, threads holding locks but not being dispatches, will be rescheduled (dispatched), when another thread is attempting to acquire the lock. This will result in increased context switching.
The system is implemented as follows: A lock count is maintained as part of the thread state. A register RLOCKS is one possible location where the count is automatically incremented when a lock operation is issued by the executing thread and it is decremented when an unlock operation is issued by the thread. The RLOCKS register is part of the thread state and is saved and restored across context switches. Another register RDELAY is maintained which specifies the maximum number of cycles the delivery of an interrupt (external or timer) can be delayed...