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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 - Wikipedia
    The modern lighthouse is a semaphore using a tower, building, or another type of structure designed to emit light from a system of lamps and lenses and to serve as a navigational aid for maritime pilots at sea or on inland waterways
  • Semaphores in Process Synchronization - GeeksforGeeks
    A semaphore is a synchronization tool used in operating systems to manage access to shared resources in a multi-process or multi-threaded environment It is an integer variable that controls process execution using atomic operations like wait () and signal ()
  • Semaphore (programming) - Wikipedia
    In computer science, a semaphore is a synchronization device used to control access to a common resource by multiple threads or processes in a concurrent system, such as a multitasking operating system It allows simultaneous access to a critical section by some predetermined number of processes
  • 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)
  • Semaphore UI for Ansible, Terraform and Bash
    Use Semaphore UI with Ansible, Terraform, OpenTofu, Terragrunt, Bash, PowerShell, and Python, while keeping your automation in Git and your existing toolchain intact
  • multithreading - What is a semaphore? - Stack Overflow
    A semaphore is a programming concept that is frequently used to solve multi-threading problems My question to the community: What is a semaphore and how do you use it?
  • Semafor - An intelligent, transparent global news platform . . .
    Texas solar manufacturer T1 Energy is racing toward a China-free supply chain — but it’s not there yet Illustration: Kevin Zweerink Semafor Photo: Tim McDonnell Semafor The company’s debut indicates confidence in market appetite for the AI trade despite a recent selloff





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