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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244
14
章 マルチスレッド処理
consume
なら取得フェンスを作る。アトミック読み込み演算は取得フェンスの前でなければ
ならない。
引数 値が
memory_order_relaxed
なら、関数 は何ら 影響を 持たな い。引数 値
memory_
order_acq_rel
と
memory_order_seq_cst
が解放取得フェンスを指定する。
フェンスはメモリ順序最適化を促進する。前の例で、
if
分岐に獲得演算を設定すれば、
スレッド演算が同期できる。
//
スレッド
2:
dp = (struct Data*) atomic_load_explicit(&aptr, memory_order_relaxed);
if (dp != NULL)
{
atomic_thread_fence(memory_order_acquire);
//
演算
B:
// *dp
でデータ処理
}
else
{
// *dp
のデータはまだ得られない
}
14.3
スレッド間通信：条件変数
C11標準はスレッド間通信に条件変数を用意する。スレッドは条件変数を使ってある条
件が満たされたという他のスレッドからの通知を待つ。この通知は、例えば、あるデータ
が処理できるようになったと知らせる。
条件変数は、型
cnd_t
のオブジェクトで表し、mutexと一緒に使われる。一般的な手続
きは次の通り。スレッドがmutexを取得し条件を調べる。条件が満たされていないと、ス
レッドはmutexを解放して、他のスレッドが起こしてくれるまで条件変 ...
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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.