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- Spinlock abstract "In software engineering, a spinlock is a lock which causes a thread trying to acquire it to simply wait in a loop ("spin") while repeatedly checking if the lock is available. Since the thread remains active but is not performing a useful task, the use of such a lock is a kind of busy waiting. Once acquired, spinlocks will usually be held until they are explicitly released, although in some implementations they may be automatically released if the thread being waited on (that which holds the lock) blocks, or "goes to sleep".Because they avoid overhead from operating system process re-scheduling or context switching, spinlocks are efficient if threads are only likely to be blocked for a short period. For this reason, spinlocks are often used inside operating system kernels. However, spinlocks become wasteful if held for longer durations, as they may prevent other threads from running and require re-scheduling. The longer a lock is held by a thread, the greater the risk is that the thread will be interrupted by the OS scheduler while holding the lock. If this happens, other threads will be left "spinning" (repeatedly trying to acquire the lock), while the thread holding the lock is not making progress towards releasing it. The result is an indefinite postponement until the thread holding the lock can finish and release it. This is especially true on a single-processor system, where each waiting thread of the same priority is likely to waste its quantum (allocated time where a thread can run) spinning until the thread that holds the lock is finally finished.Implementing spin locks correctly is difficult because one must take into account the possibility of simultaneous access to the lock, which could cause race conditions. Generally, such implementation is only possible with special assembly language instructions, such as atomic test-and-set operations, and cannot be easily implemented in high-level programming languages or in languages not supporting truly atomic operations. On architectures without such operations, or if high-level language implementation is required, a non-atomic locking algorithm may be used, e.g. Peterson's algorithm. But note that such an implementation may require more memory than a spinlock, be slower to allow progress after unlocking, and may not be implementable in a high-level language if out-of-order execution is allowed.".
- Spinlock wikiPageExternalLink classSpinLock.html.
- Spinlock wikiPageExternalLink spinlocks.asp.
- Spinlock wikiPageExternalLink ck_spinlock.h.
- Spinlock wikiPageExternalLink cc163726.aspx.
- Spinlock wikiPageExternalLink ms684122(VS.85).aspx.
- Spinlock wikiPageExternalLink citation.cfm?id=103727.103729.
- Spinlock wikiPageExternalLink spinlock.html.
- Spinlock wikiPageExternalLink pthread_spin_lock.html.
- Spinlock wikiPageExternalLink 2006.html.
- Spinlock wikiPageID "244603".
- Spinlock wikiPageRevisionID "604255108".
- Spinlock hasPhotoCollection Spinlock.
- Spinlock subject Category:Concurrency_control_algorithms.
- Spinlock subject Category:Programming_constructs.
- Spinlock type Abstraction100002137.
- Spinlock type Act100030358.
- Spinlock type Activity100407535.
- Spinlock type Algorithm105847438.
- Spinlock type Cognition100023271.
- Spinlock type Concept105835747.
- Spinlock type ConcurrencyControlAlgorithms.
- Spinlock type Content105809192.
- Spinlock type Event100029378.
- Spinlock type Idea105833840.
- Spinlock type Procedure101023820.
- Spinlock type ProgrammingConstructs.
- Spinlock type PsychologicalFeature100023100.
- Spinlock type Rule105846932.
- Spinlock type YagoPermanentlyLocatedEntity.
- Spinlock comment "In software engineering, a spinlock is a lock which causes a thread trying to acquire it to simply wait in a loop ("spin") while repeatedly checking if the lock is available. Since the thread remains active but is not performing a useful task, the use of such a lock is a kind of busy waiting.".
- Spinlock label "Spinlock".
- Spinlock label "Spinlock".
- Spinlock label "Spinlock".
- Spinlock label "Spinlock".
- Spinlock label "Spinlock".
- Spinlock label "Spinlock".
- Spinlock label "Spinlock".
- Spinlock label "スピンロック".
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- Spinlock sameAs Q570276.
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- Spinlock wasDerivedFrom Spinlock?oldid=604255108.
- Spinlock isPrimaryTopicOf Spinlock.