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なるほどUNIXプロセス14_15章
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indigolain
May 07, 2016
Programming
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なるほどUNIXプロセス14_15章
なるほどUNIXプロセス14_15章
http://tatsu-zine.com/books/naruhounix
indigolain
May 07, 2016
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Transcript
14~15ষ ͳΔ΄ͲUNIXϓϩηε
ςΩετ ୈ̍̐ষϓϩηεͯΔ ▸ ࢠकΓ ▸ Process.waitͱͦͷҰ ▸ Process.wait2ΛͬͯΓͱΓ͢Δ ▸ ಛఆͷࢠϓϩηεΛͭ
▸ ڝ߹ঢ়ଶ ▸ ࣮༻ྫ ▸ ͜ͷষͰѻͬͨγεςϜίʔϧ
ςΩετ ࢠकΓ ▸ ͜Ε·Ͱѻ͖ͬͯͨfork(2)ͷྫʮܸͪͬͺͳ͠(fire and forget)ʯ ▸ ࢠϓϩηεଆͰ͋ΔॲཧΛͤͭͭ͞ɺඇಉظͰϓϩηε ͰผͷॲཧΛ͢Δ߹ʹྑ͍ ▸
͜ͷ߹Ҏ֎ࢠϓϩηεΛཧͯ͘͠ΕΔΈ͕ඞཁ ▸ ͜Ε͕Process.wait
ςΩετ ࢠकΓ ▸ process_wait_example.rb ▸ Process.waitࢠϓϩηεͷͲΕ͔͕̍ͭऴྃ͢Δ·Ͱͷ ؒɺϓϩηεΛϒϩοΫͯͭ͠ɻ
ςΩετ PROCESS.WAITͱͦͷҰ ▸ ̍ͭҎ্ͷϓϩηεΛࢹ͢Δඞཁ͕͋Δ߹ɺͲͷࢠϓϩ ηε͕ऴ͔ྃͨ͠ΛΔඞཁ͕͋Δ ▸ Process.waitͷΓऴྃͨ͠ࢠϓϩηεͷpidΛฦ͢ͷ Ͱɺ͜ΕΛ͏ ▸ process_wait_pid_example.rb
ςΩετ PROCESS.WAIT2ΛͬͯΓͱΓ͢Δ ▸ Process.waitʹProcess.wait2ͱ͍͏ੰ͕͋Δ ▸ Process.wait2pidͱऴྃεςʔλεΛฦΓͱͯ͠ฦ͢ ▸ ऴྃεςʔλεऴྃίʔυʹΑΔϓϩηεಉ࢜ͷ௨৴खஈͱ͠ ͯΘΕΔ ▸
Process.wait2͕ฦ͢ऴྃεςʔλεProcess::StatusΫϥεͷΠ ϯελϯε ▸ process_wait2_example.rb
ςΩετ ಛఆͷࢠϓϩηεΛͭ ▸ Process.watpidͱProcess.waitpid2 ▸ ऴྃΛͭͷҙͷࢠϓϩηεͰͳ͘ɺࢦఆͨ͠ࢠϓϩηε ▸ ऴྃΛͭࢠϓϩηεpidͰࢦఆ͢Δ ▸ ݩಉؔ͡Λࢦ͍ͯ͠Δ
▸ Process.waitʹpidΛ͢ ▸ Process.waitpidʹ-1Λ͢
ςΩετ ڝ߹ঢ়ଶ ▸ Χʔωϧऴྃͨ͠ϓϩηεΛΩϡʔʹೖΕΔ ▸ ऴྃΛͭࢠϓϩηε͕1ͭແ͍ঢ়ଶͰProcess.waitΛݺ ͼग़͢ͱErrno::ECHILDྫ֎͕ૹग़͞ΕΔ ▸ no_processwait.rb
ςΩετ ࣮༻ྫ ▸ ࢠϓϩηεΛ׆༻͢Δύλʔϯ ▸ ༻ҙͨ͠1ͭͷϓϩηε͔ΒฒߦॲཧͷͨΊʹෳͷࢠϓϩηεΛੜ ͯ͠ɺͦͷޙࢠϓϩηεͷ໘ΛΈΔͱ͍͏ܗࣜ ▸ Ԡ/ऴྃ࣌ͷޙ࢝ͳͲ ▸
Unicorn͕͜ͷύλʔϯΛ࠾༻͍ͯ͠Δ ▸ αʔόىಈ࣌ʹϫʔΧʔϓϩηεΛ͍ͭ͘͏͔Λࢦఆ͢Δ ▸ Unicornʹؔͯ͠2ʮUnicornͷϫʔΧʔϓϩηεͷཧʯࢀর
ςΩετ ͜ͷষͰѻͬͨγεςϜίʔϧ ▸ Process.waitܥwaitpid(2)ʹରԠ͍ͯ͠Δ
ςΩετ ୈ̍̑ষκϯϏϓϩηε ▸ Ռใ৸ͯͯ ▸ κϯϏͲΜͳ෩ʹΈ͑Δͷ͔ʁ ▸ ࣮༻ྫ ▸ ͜ͷষͰѻͬͨγεςϜίʔϧ
ςΩετ Ռใ৸ͯͯ ▸ Χʔωϧϓϩηε͕Process.waitΛͬͯͦͷใΛཁٻ͢Δ·Ͱ ऴྃͨ͠ࢠϓϩηεͷใΛͣͬͱ࣋ͪଓ͚Δ ▸ ΧʔωϧͷϦιʔεͷແବ͍ʹͭͳ͕ͬͯ͠·͏ ▸ Process.waitΛͬͯࢠϓϩηεͷऴྃΛͨͳ͍߹ɺࢠϓϩηεΛ σλονͤͶͳΒͳ͍
▸ Process.detachpidͰࢦఆ͞ΕͨࢠϓϩηεͷऴྃΛͭεϨουΛ ੜ͢Δ ▸ detach_example.rb
ςΩετ κϯϏͱͲͷΑ͏ʹݟ͑Δͷ͔ʁ ▸ zombie_process_example.rb ▸ ps -ho pid, state -p
[κϯϏʹͳͬͨϓϩηεͷpid]
ςΩετ ࣮༻ྫ ▸ ϓϩηεʹͨΕͣʹࢮΜͰ͠·ͬͨࢠϓϩηεྫ֎ͳ͘κϯϏϓ ϩηεʹͳΔ ▸ ϓϩηε͕κϯϏϓϩηεͷऴྃεςʔλεΛऔಘ͢Εɺใ ফ͑Δ ▸ ॲཧΛόοΫάϥϯυͰ࣮ߦ͢Δඞཁ͕͋ΔόΠΠʹɺઐ༻ͷόο
ΫάϥϯυΩϡʔΠϯάγεςϜ͕ΘΕΔ͜ͱ͕ଟ͍ ▸ spawnlingͱ͍͏gemΛ͑ɺϓϩηεεϨουΛѻ͏૯শతͳ APIΛఏڙ͢Δ͜ͱʹՃ͑ͯɺʮܸͪͬ์͠ʯͰੜͨ͠ࢠϓϩηεΛ Ͱλονͯ͘͠ΕΔ
ςΩετ ͜ͷষͰѻͬͨγεςϜίʔϧ ▸ Process.detachʹ͋ͨΔγεςϜίʔϧଘࡏ͠ͳ͍ ▸ RubyͰεϨουͱProcess.waitΛ࣮ͬͯݱ͍ͯ͠Δ