Concurrency-safe reader-writer lock with time out support
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United States of America Patent
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Apr 8, 2003
Grant Date -
N/A
app pub date -
Dec 15, 1999
filing date -
Dec 15, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Synchronization services provide a concurrency-safe reader/writer lock supporting a time out feature. The lock can be implemented using lockless data structures to provide efficient synchronization services. Various features such as lock nesting and auto-transformation address common scenarios arising in componentized programs. The lock supports upgrading and suspension, and the time out feature can support an efficient, low-cost optimistic deadlock avoidance scheme. Peculiarities of the reader/writer scenario are addressed in an efficient way to maintain lock stability and consistency, thus providing synchronization services suitable for implementation at the kernel level. In one implementation using event objects, the events are managed for high efficiency and stability of the lock. For multiprocessor machines, a hybrid lock avoids a context switch by behaving as a spin lock before waiting for the lock to become available.
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