http://itdoc.hitachi.co.jp/manuals/link/cosmi_v0950/03Y1830D/EY180028.HTM ・Apache/Nginx https://milestone-of-se.nesuke.com/sv-basic/linux-basic/apache-mpm-prefork-worker-event/ ・プロセス/スレッド https://shinpeim.github.io/process-book/002.md/ https://knowledge.sakura.ad.jp/24148/ https://openstandia.jp/pdf/140228_osc_seminar_ssof8.pdf etc.