November 2016
Beginner to intermediate
816 pages
19h 58m
Japanese
Content preview from Cクイックリファレンス 第2版
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14.2
共有データへのアクセス
241
算となる。同様に、
+=
のような複合代入演算子は左オペランドがアトミックオブジェクト
ならアトミックになる。例14-2のプログラムは、変数
counter
をアトミックと宣言して、他
は変えずに正しい最終カウンタ値0が得られる。プログラムの時間計測からアトミックカウ
ンタ変数を使った版が例14-3のmutexを使った版より2倍以上速いことがわかる。
既 に 述 べ た 演 算 子 の 他 に も、
atomic_store()
,
atomic_exchange()
,
atomic_compare_
exchange_strong()
を含めて多数のアトミック演算を行う関数がある。17章にこの種の関
数の概要を述べ、18章でそれぞれの詳細を述べる。
アトミック型は、この型のオブジェクトへのアトミックアクセスが
lock/unlock
演算を
使わずに実現できれば、ロックフリー特性を持つ。2つの状態「セット」と「クリア」しか
持
たない構造体型
atomic_flag
だけがロックフリー特性を持つことを保証される。マクロ
ATOMIC_FLAG_INIT
は
atomic_flag
オブジェクトを「クリア」状態に、例えば次の宣言のよう
に初期化する。
atomic_flag done = ATOMIC_FLAG_INIT;
atomic_flag
オブジェクトに通例のフラグ演算を行うため、C11は関数
atomic_flag_
test_and_set()
と
atomic_flag_clear()
を
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.