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Lock computer science - Types
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Lock computer science, Lock computer science - Database locks, Lock computer science - Granularity, Lock computer science - Implementation, Lock computer science - Types, Semaphore (programming), Monitor (synchronization), Mutual exclusion, Critical section, Double-checked locking, Lock-free and wait-free algorithms

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Lock computer science - Types: Encyclopedia II - Lock computer science - Types

Generally, locks are advisory locks, where each thread cooperates by acquiring the lock before accessing the corresponding data. Some systems also implement mandatory locks, where attempting unauthorized access to a locked resource will force an exception in the entity attempting to make the access. A semaphore is the simplest type of lock. No distinction is made between shared (read only) or exclusive (read and write) modes. Other schemes provide for a shared mode, where several threads can acquire a shared lock for read-only access to the data. Other modes such as shared, exclusive, intend-to-exclude and ...

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Lock computer science, Lock computer science - Types, Lock computer science - Implementation, Lock computer science - Granularity, Lock computer science - Database locks

Read more here: » Lock computer science: Encyclopedia II - Lock computer science - Types

Lock computer science - Types: Encyclopedia II - Lock computer science - Implementation

Locks typically require hardware support for efficient implementation. This usually takes the form of one or more atomic instructions such as "test-and-set", "fetch-and-add" or "compare-and-swap". These instructions allow a single process to test if the lock is free, and if free, acquire the lock in a single atomic operation. Uniprocessor architectures have the option of using uninterruptable sequences of instructions, using special instructions or instruction prefixes to disable interrupts temporarily, but this technique does not wor ...

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Lock computer science, Lock computer science - Types, Lock computer science - Implementation, Lock computer science - Granularity, Lock computer science - Database locks

Read more here: » Lock computer science: Encyclopedia II - Lock computer science - Implementation

Lock computer science - Types: Encyclopedia II - Lock computer science - Database locks

In databases, locks can be used as a means of ensuring transaction synchronisity. i.e. when making transaction processing concurrent (interleaving transactions), using 2-phased locks ensures that the concurrent execution of the transaction turns out equivalent to some serial ordering of the transaction. However, deadlocks become an unfortunate side-effect of locking in databases. Deadlocks are either prevented by pre-determining the locking order between transactions or are detected using waits-for graphs. An alternate to locking for database synchronisity while avoiding deadlocks involves the ...

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Lock computer science, Lock computer science - Types, Lock computer science - Implementation, Lock computer science - Granularity, Lock computer science - Database locks

Read more here: » Lock computer science: Encyclopedia II - Lock computer science - Database locks

Lock computer science - Types: Encyclopedia II - Lock computer science - Granularity

An important property of a lock is its granularity. The granularity is a measure of the amount of data the lock is protecting. In general, choosing a coarse granularity (a small number of locks, each protecting a large segment of data) results in less overhead when a single process is accessing the protected data, but worse performance when multiple processes are running concurrently. This is because of increased lock contention: the more coarse the lock, the higher the likelihood that the lock will stop an unrelated process from proc ...

See also:

Lock computer science, Lock computer science - Types, Lock computer science - Implementation, Lock computer science - Granularity, Lock computer science - Database locks

Read more here: » Lock computer science: Encyclopedia II - Lock computer science - Granularity

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