reentrant

alternative re-entrant · alternative reëntrant

1. historicalnot comparablefortificationDesignating a structure at an angle pointing inward towards the centre of the fortification; opposed to salient.First known use 18th c.
2. not comparablePertaining to an angle pointing inwards, or to a line forming part of such an angle.First known use 18th c.

   [T]he eye was enclosed in a six-pointed star, and swords with undulating blades issued from each re-entrant angle.

   1917, Aleister Crowley, Moonchild, Weiser, published 2010, page 78

3. not comparablegeographyPertaining to a type of angular valley cutting deep into the side of a hill or mountain.First known use 20th c.
4. not comparablemedicinePertaining to a type of cardiac arrhythmia in which an impulse re-excites an area that has already been stimulated.First known use 20th c.
5. not comparableentertainmentDesignating a way of tuning the strings of certain stringed instruments, such that they follow a pattern of rising and falling intervals, rather than having successively higher pitches.First known use 20th c.
6. not comparablecomputingThat may be executed more than once at a time either by different threads, or because of recursion.First known use 20th c.

   Global variables must not be altered by reentrant code.

   1 more example

   To mitigate that risk, there's an important exception to actor serialization: actors are reentrant. This means that when an actor itself says await, then while the actor's code is waiting, its members can be accessed from outside the actor using await.

   2021, Matt Neuburg, iOS 15 Programming Fundamentals with Swift, 8th edition, O'Reilly, →ISBN, page 386

7. not comparableaeronauticsDesigned to return to the Earth's atmosphere.
8. not comparablecomputingSuch that the corresponding lock can be reacquired by the locking thread.

   The global interpreter lock of the embedded scripting engine is not reentrant.

plural reentrants · alternative re-entrant · alternative reëntrant

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