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

Transcript

1. 14~15ষ ͳΔ΄ͲUNIXϓϩηε
2. ςΩετ ୈ̍̐ষϓϩηε͸଴ͯΔ ▸ ࢠकΓ ▸ Process.waitͱͦͷҰ଒ ▸ Process.wait2Λ࢖ͬͯ΍ΓͱΓ͢Δ ▸ ಛఆͷࢠϓϩηεΛ଴ͭ ▸ ڝ߹ঢ়ଶ ▸ ࣮༻ྫ ▸ ͜ͷষͰѻͬͨγεςϜίʔϧ
3. ςΩετ ࢠकΓ ▸ ͜Ε·Ͱѻ͖ͬͯͨfork(2)ͷྫ͸ʮܸͪͬͺͳ͠(fire and forget)ʯ ▸ ࢠϓϩηεଆͰ͋ΔॲཧΛͤͭͭ͞ɺඇಉظͰ਌ϓϩηε ͰผͷॲཧΛ͢Δ৔߹ʹ͸ྑ͍ ▸ ͜ͷ৔߹Ҏ֎͸ࢠϓϩηεΛ؅ཧͯ͘͠ΕΔ࢓૊Έ͕ඞཁ ▸ ͜Ε͕Process.wait
4. ςΩετ ࢠकΓ ▸ process_wait_example.rb ▸ Process.wait͸ࢠϓϩηεͷͲΕ͔͕̍ͭऴྃ͢Δ·Ͱͷ ؒɺ਌ϓϩηεΛϒϩοΫͯ͠଴ͭɻ
5. ςΩετ PROCESS.WAITͱͦͷҰ଒ ▸ ̍ͭҎ্ͷϓϩηεΛ؂ࢹ͢Δඞཁ͕͋Δ৔߹ɺͲͷࢠϓϩ ηε͕ऴ͔ྃͨ͠Λ஌Δඞཁ͕͋Δ ▸ Process.waitͷ໭Γ஋͸ऴྃͨ͠ࢠϓϩηεͷpidΛฦ͢ͷ Ͱɺ͜ΕΛ࢖͏ ▸ process_wait_pid_example.rb
6. ςΩετ PROCESS.WAIT2Λ࢖ͬͯ΍ΓͱΓ͢Δ ▸ Process.waitʹ͸Process.wait2ͱ͍͏਌ੰ͕͋Δ ▸ Process.wait2͸pidͱऴྃεςʔλεΛฦΓ஋ͱͯ͠ฦ͢ ▸ ऴྃεςʔλε͸ऴྃίʔυʹΑΔϓϩηεಉ࢜ͷ௨৴खஈͱ͠ ͯ࢖ΘΕΔ ▸ Process.wait2͕ฦ͢ऴྃεςʔλε͸Process::StatusΫϥεͷΠ ϯελϯε ▸ process_wait2_example.rb
7. ςΩετ ಛఆͷࢠϓϩηεΛ଴ͭ ▸ Process.watpidͱProcess.waitpid2 ▸ ऴྃΛ଴ͭͷ͸೚ҙͷࢠϓϩηεͰ͸ͳ͘ɺࢦఆͨ͠ࢠϓϩηε ▸ ऴྃΛ଴ͭࢠϓϩηε͸pidͰࢦఆ͢Δ ▸ ݩ͸ಉؔ͡਺Λࢦ͍ͯ͠Δ ▸ Process.waitʹpidΛ౉͢ ▸ Process.waitpidʹ-1Λ౉͢
8. ςΩετ ڝ߹ঢ়ଶ ▸ Χʔωϧ͸ऴྃͨ͠ϓϩηεΛΩϡʔʹೖΕΔ ▸ ऴྃΛ଴ͭࢠϓϩηε͕1ͭ΋ແ͍ঢ়ଶͰProcess.waitΛݺ ͼग़͢ͱErrno::ECHILDྫ֎͕ૹग़͞ΕΔ ▸ no_processwait.rb
9. ςΩετ ࣮༻ྫ ▸ ࢠϓϩηεΛ׆༻͢Δύλʔϯ ▸ ༻ҙͨ͠1ͭͷϓϩηε͔ΒฒߦॲཧͷͨΊʹෳ਺ͷࢠϓϩηεΛੜ ੒ͯ͠ɺͦͷޙ͸ࢠϓϩηεͷ໘౗ΛΈΔͱ͍͏ܗࣜ ▸ Ԡ౴/ऴྃ࣌ͷޙ࢝຤ͳͲ ▸ Unicorn͕͜ͷύλʔϯΛ࠾༻͍ͯ͠Δ ▸ αʔόىಈ࣌ʹϫʔΧʔϓϩηεΛ͍ͭ͘࢖͏͔Λࢦఆ͢Δ ▸ Unicornʹؔͯ͠͸෇࿥2ʮUnicornͷϫʔΧʔϓϩηεͷ؅ཧʯࢀর
10. ςΩετ ͜ͷষͰѻͬͨγεςϜίʔϧ ▸ Process.waitܥ͸waitpid(2)ʹରԠ͍ͯ͠Δ
11. ςΩετ ୈ̍̑ষκϯϏϓϩηε ▸ Ռใ͸৸ͯ଴ͯ ▸ κϯϏ͸ͲΜͳ෩ʹΈ͑Δͷ͔ʁ ▸ ࣮༻ྫ ▸ ͜ͷষͰѻͬͨγεςϜίʔϧ
12. ςΩετ Ռใ͸৸ͯ଴ͯ ▸ Χʔωϧ͸਌ϓϩηε͕Process.waitΛ࢖ͬͯͦͷ৘ใΛཁٻ͢Δ·Ͱ ऴྃͨ͠ࢠϓϩηεͷ৘ใΛͣͬͱ࣋ͪଓ͚Δ ▸ ΧʔωϧͷϦιʔεͷແବ࢖͍ʹͭͳ͕ͬͯ͠·͏ ▸ Process.waitΛ࢖ͬͯࢠϓϩηεͷऴྃΛ଴ͨͳ͍৔߹ɺࢠϓϩηεΛ σλονͤͶ͹ͳΒͳ͍ ▸ Process.detach͸pidͰࢦఆ͞ΕͨࢠϓϩηεͷऴྃΛ଴ͭεϨουΛ ੜ੒͢Δ ▸ detach_example.rb
13. ςΩετ κϯϏͱ͸ͲͷΑ͏ʹݟ͑Δͷ͔ʁ ▸ zombie_process_example.rb ▸ ps -ho pid, state -p [κϯϏʹͳͬͨϓϩηεͷpid]
14. ςΩετ ࣮༻ྫ ▸ ਌ϓϩηεʹ଴ͨΕͣʹࢮΜͰ͠·ͬͨࢠϓϩηε͸ྫ֎ͳ͘κϯϏϓ ϩηεʹͳΔ ▸ ਌ϓϩηε͕κϯϏϓϩηεͷऴྃεςʔλεΛऔಘ͢Ε͹ɺ৘ใ͸ ফ͑Δ ▸ ॲཧΛόοΫάϥ΢ϯυͰ࣮ߦ͢Δඞཁ͕͋ΔόΠΠʹ͸ɺઐ༻ͷόο Ϋάϥ΢ϯυΩϡʔΠϯάγεςϜ͕࢖ΘΕΔ͜ͱ͕ଟ͍ ▸ spawnlingͱ͍͏gemΛ࢖͑͹ɺϓϩηε΍εϨουΛѻ͏૯শతͳ APIΛఏڙ͢Δ͜ͱʹՃ͑ͯɺʮܸͪͬ์͠ʯͰੜ੒ͨ͠ࢠϓϩηεΛ Ͱλονͯ͘͠ΕΔ
15. ςΩετ ͜ͷষͰѻͬͨγεςϜίʔϧ ▸ Process.detachʹ͋ͨΔγεςϜίʔϧ͸ଘࡏ͠ͳ͍ ▸ RubyͰ͸εϨουͱProcess.waitΛ࢖࣮ͬͯݱ͍ͯ͠Δ