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semaphore    
n. 臂式号志,信号,手旗信号
vt. 以信号机联络
vi. 打信号

臂式号志,信号,手旗信号以信号机联络打信号

semaphore
信号; 信号标志; 信号灯

semaphore
旗号

semaphore
n 1: an apparatus for visual signaling with lights or
mechanically moving arms
v 1: send signals by or as if by semaphore
2: convey by semaphore, of information

Semaphore \Sem"a*phore\, n. [Gr. sh^ma a sign fe`rein to bear:
cf. F. s['e]maphore.]
A signal telegraph; an apparatus for giving signals by the
disposition of lanterns, flags, oscillating arms, etc.
[1913 Webster] Semaphoric

72 Moby Thesaurus words for "semaphore":
Roman candle, aid to navigation, alarm, amber light, balefire,
beacon, beacon fire, bell, bell buoy, blinker, blue peter, buoy,
caution light, flare, fog bell, fog signal, fog whistle, foghorn,
glance, go light, gong buoy, green light, heliograph, high sign,
international alphabet flag, international numeral pennant, kick,
leer, marker beacon, nod, nudge, parachute flare, pilot flag, poke,
police whistle, quarantine flag, radio beacon, red flag, red light,
rocket, sailing aid, semaphore flag, semaphore telegraph, sign,
signal, signal beacon, signal bell, signal fire, signal flag,
signal gong, signal gun, signal lamp, signal light, signal mast,
signal post, signal rocket, signal shot, signal siren,
signal tower, spar buoy, stop light, the nod, the wink, touch,
traffic light, traffic signal, watch fire, white flag, wigwag,
wigwag flag, wink, yellow flag

The classic method for
restricting access to shared resources (e.g. storage) in a
{multi-processing} environment. They were invented by
{Dijkstra} and first used in {T.H.E} {operating system}.

A semaphore is a {protected variable} (or {abstract data
type}) which can only be accessed using the following
operations:

P(s)
Semaphore s;
{
while (s == 0) ; /* wait until s>0 */
s = s-1;
}

V(s)
Semaphore s;
{
s = s1;
}

Init(s, v)
Semaphore s;
Int v;
{
s = v;
}

P and V stand for Dutch "Proberen", to test, and "Verhogen",
to increment. The value of a semaphore is the number of units
of the resource which are free (if there is only one resource
a "binary semaphore" with values 0 or 1 is used). The P
operation {busy-waits} (or maybe {sleeps}) until a resource is
available whereupon it immediately claims one. V is the
inverse, it simply makes a resource available again after the
process has finished using it. Init is only used to
initialise the semaphore before any requests are made. The P
and V operations must be {indivisible}, i.e. no other process
can access the semaphore during the their execution.

To avoid {busy-wait}ing, a semaphore may have an associated
{queue} of processes (usually a {FIFO}). If a process does a
P on a semaphore which is zero the process is added to the
semaphore's queue. When another process increments the
semaphore by doing a V and there are tasks on the queue, one
is taken off and resumed.

(1995-02-01)


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  • Semaphore (programming) - Wikipedia
    In computer science, a semaphore is a variable or abstract data type used to control access to a common resource by multiple threads and avoid critical section problems in a concurrent system such as a multitasking operating system
  • multithreading - What is a semaphore? - Stack Overflow
    A semaphore is a programming construct that helps us achieve concurrency, by implementing both synchronization and mutual exclusion Semaphores are of two types, Binary and Counting A semaphore has two parts : a counter, and a list of tasks waiting to access a particular resource
  • SEMAPHORE Definition Meaning - Merriam-Webster
    The meaning of SEMAPHORE is an apparatus for visual signaling (as by the position of one or more movable arms)
  • Semaphores in Process Synchronization - GeeksforGeeks
    Semaphore Value: 1 (only one print job can access the printer at a time) Process Acquire Semaphore: First, acquire a semaphore for the printer to begin the print job Print Job Execution: The printer processes the print job Release Semaphore: Now the semaphore is released after the job is done 5 Railway Track Management
  • Semaphore Class (System. Threading) | Microsoft Learn
    You can create multiple Semaphore objects that represent the same named system semaphore, and you can use the OpenExisting method to open an existing named system semaphore A local semaphore exists only within your process
  • What Is a Semaphore? | Baeldung on Computer Science
    A semaphore is an integer variable, shared among multiple processes The main aim of using a semaphore is process synchronization and access control for a common resource in a concurrent environment The initial value of a semaphore depends on the problem at hand
  • What is Semaphore? Counting, Binary Types with Example - Guru99
    This tutorial covers semaphore definition, characteristics, Types, Wait and signal operation, Counting and binary semaphore differences, Advantages, and more





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