semaphore
semaphore
Definition
sema·phore (sem′ə fôr′)
noun
- any apparatus for signaling, as the arrangement of lights, flags, and mechanical arms on railroads
- a system of signaling by the use of two flags, one held in each hand: the letters of the alphabet are represented by the various positions of the arms
- any system of signaling by semaphore
Etymology: Fr sémaphore < Gr sēma, sign (see semantic) + -phoros: see -phore
transitive verb, intransitive verb -·phored′, -·phor′·ing
to signal by semaphore
sem′a·phor′ic adjective
sem′a·phor′·ist noun
semaphore
Usage Examples
Converse of object
- set: This prevents an aborted process from leaving a semaphore set in an inconsistent state.
- use: Note that this program does not use threads; it is just using the lightweight semaphores available from the threads library.
- replace: Under British Railways, color aspect lights replaced semaphores at the London end of the platforms, such occurring on 16th May 1954.
- have: We have as yet no Semaphores on our coasts.
- initialize: Multiple threads must not initialize the same semaphore simultaneously.
- operate: The majority of the signaling will be pneumatically operated semaphores.
Adjective modifier
- binary: For synchronization, simple locks ( a.k.a. mutexes or binary semaphores ) are provided.
- single: A POSIX semaphore structure defines a single semaphore, not an array of up to twenty five semaphores.
Modifies a noun
- signal: Upper Quadrant Signal A semaphore signal in which the arm was raised to indicate ' off ' or ' clear ' .
- flag: If you don't have any proper semaphore flags, then you could make some.
- arm: This view of Canterbury East signal box from the 1970s reveals both semaphore signal arms still in use.
- indicator: Later Minors also have larger front indicators instead of the semaphore indicators fitted to the B pillar of the 1950s Morris cars.
- operation: This function takes a pointer, sops, to an array of semaphore operation structures.
- set: The calling process must have alter access privileges on the semaphore set.
Noun used with modifier
- semnum: GETVAL The system call returns the value of semval for the semnum -th semaphore of the set.
- -th: GETVAL The system call returns the value of semval for the semnum -th semaphore of the set.
- V: It means your kernel's limit on the number of System V semaphores is smaller than the number PostgreSQL wants to create.
Present participle complement
- signal: The delightful Severn Valley from MOAT LANE through NEWTOWN and WELSHPOOL to SHREWSBURY where semaphore signaling abounds.
Preposition: in
