英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字，中文词皆可：

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)


请选择你想看的字典辞典：
单词字典翻译
semaphore查看　semaphore　在百度字典中的解释百度英翻中〔查看〕
semaphore查看　semaphore　在Google字典中的解释Google英翻中〔查看〕
semaphore查看　semaphore　在Yahoo字典中的解释Yahoo英翻中〔查看〕

安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • 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?
  • single. dvi - University of Wisconsin–Madison
    A semaphore is an object with an integer value that we can manipulate with two routines; in the POSIX standard, these routines are sem wait() and sem post()1 Because the initial value of the semaphore deter-mines its behavior, before calling any other routine to interact with the semaphore, we must first initialize it to some value, as the
  • Understanding Semaphores in C# - Stack Overflow
    A Semaphore is a synchronization object that allows a limited degree of parallelism in a code section For sake of simplicity, suppose you are instantiating a fresh new semaphore on a code block (no shared instance, global variable or other evil)
  • What is the difference between lock, mutex and semaphore?
    I've heard these words related to concurrent programming, but what's the difference between lock, mutex and semaphore?
  • Need to understand the usage of SemaphoreSlim - Stack Overflow
    Here is the code I have but I don't understand what SemaphoreSlim is doing async Task WorkerMainAsync() { SemaphoreSlim ss = new SemaphoreSlim(10); List lt;Task gt; trackedTasks = new List
  • java - How does semaphore work? - Stack Overflow
    The Java Semaphore class allows a reverse situation, where a semaphore can start off with a negative number of permits, and all acquire() calls will fail until there have been enough release() calls Once the number of permits has become non-negative, it will never become negative again
  • Difference between Semaphore initialized with 1 and 0
    Please tell what is difference between a Semaphore initialized with 1 and Vs intialized zero, as below: public static Semaphore semOne = new Semaphore(1); and public static Semaphore semZero = new
  • Why use a mutex and not a semaphore? - Stack Overflow
    In general, mutex and semaphore target different use cases: A semaphore is for signalling, a mutex is for mutual exclusion Mutual exclusion means you want to make sure that multiple threads cannot execute certain critical sections of code at the same time std::mutex is the only synchronization facility in the standard library for this use case





中文字典-英文字典  2005-2009