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【C++】unistd.hのsleep()で1秒未満の値を設定する

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unisth.h での sleep() メソッド

#include "unistd.h"
    :
    :
sleep(0.5f);
    :
    :

これではディレイはかけられない。

sleep() メソッドは1秒単位でしか値をセットできない

コードを見ると、

sleep(unsigned int) __DARWIN_ALIAS_C(sleep);

引数はunsigned intになっている為、少数は渡しても切り捨てられて0になる。

usleep() を使う

1秒未満のディレイをかけたい場合はusleep()メソッドを使用する。

#include "unistd.h"
    :
    :
usleep(1000000);    // 単位は[μs]
// usleep(1e6);
// これでもOKだが、1e6はfloatでusleep(unsigned int)なのでよろしくはない。
    :
    :

単位はマイクロ秒。
ちなみに10^6で渡してもダメだった…なんでだろ。
コメントより。

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