Reentrant meaning

rē-ĕntrənt
Reentering; pointing inward.
adjective
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A reentrant angle or part.
noun
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That reenters; specif., pointed inward, as an angle.
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A reentrant angle or part.
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Reentering; pointing inward.
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(programming, of a mutual exclusion mechanism) Such that the corresponding lock can be reacquired by the locking thread.

The global interpreter lock of the embedded scripting engine is not re-entrant.

adjective
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(programming) That may be executed more than once at a time either by different threads, or because of recursion.

Global variables must not be altered by reentrant code.

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(transport, of a part of a rocket) Designed to return to the Earth's atmosphere.
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(physiology) Of or pertaining to reentry (in the heart)
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An angle or part that reenters itself.
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One who enters (the labour market, etc.) again.
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(geography) A valley between a pair of parallel ridges.
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Origin of reentrant