reentrant

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Adjective

reentrant (not comparable)

1. Reentering; pointing inward.
2. (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 reentrant.

3. (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.

4. (transport, of a part of a rocket) Designed to return to the Earth's atmosphere.
5. (physiology) Of or pertaining to reentry (in the heart)
6. (music, of a ukulele or similar instrument) Having the strings not ordered according to pitch (having a re-entry)

Noun

reentrant (plural reentrants)

1. An angle or part that reenters itself.
2. One who enters (the labour market, etc.) again.
3. (geography) A valley between a pair of parallel ridges

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