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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348
18
章 標準ライブラリ関数
行われると、
weak
関数版は、一部のコンピュータで
strong
版よりも性能が向上する。
weak
版 は「
load-locked store-conditional
」CPU命 令 を 提 供 す るAdvanced RISC
Machine（ARM）アーキテクチャを含めたより広範囲のコンピュータで、比較交換演算の効
率的な実装ができる。
■
例
この例は型
atomic_long
のオブジェクトの
*=
演算子の可能な実装を示す。これは、C11
標準の箇条6.5.16.2の脚注に示されたコード列に対応する。
static long mulwith(volatile atomic_long* alPtr, long val) // *=
{
long old_val = (*alPtr);
long new_val;
do {
new_val = old_val * val;
} whil
e (! atomic_compare_exchange_weak(alPtr, &old_val, new_val));
return new_val;
}
■
参照
●
atomic_exchange()
,
atomic_exchange_explicit()
,
atomic_store()
,
atomic_store_
explicit()
atomic_exchange, atomic_exchange_explicit
C11
アトミックオブジェクトの値を交換する
#include ...
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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.