Goroutine meets a signal

by Kei Kamikawa

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(PSPVUJOFNFFUTBTJHOBM !(P$POGFSFODF4QSJOH

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!DPEFIFY !$PEF)FY w *MJLF1FSM94(P w *MJWFJO5PLZPGSPN0LJOBXB w ❤$BQCBUUJOHDFOUFS w .FSDBSJ *OD/FX w IUUQTDPEFIFYIBUFCMPKQ

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Έͳ͞Μ

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γάφϧ࢖ͬͯ·͔͢ʁ

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࢖ͬͯ·͢ΑͶʂ

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஌Βͳ͍ਓͷͨΊʹ

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શ͘໘ന͘ͳ͍ʜ

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% man signal ʮࠓ͙࣮͢ߦʯ

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Ͳ͏͍͏࣌ʹ  γάφϧΛ࢖͍·͔͢ʁ

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γάφϧΛ࢖͏৔໘ w ॲཧΛ தஅcऴྃc࠶ىಈ ͍ͨ͠ w ׂΓࠐΈॲཧΛߦ͍͍ͨ w γάφϧΛૹΔ͜ͱͰڍಈΛมߋ͍ͨ͠ͳͲ  ʢϨΞέʔεʁʣ

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γάφϧ͸ϓϩηεʹ  ૹΓ·͢ΑͶ

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ߋʹݴ͏ͱ

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਌ϓϩηεࢠϓϩηε  ΁ͷγάφϧૹ৴΋Մೳ

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͔͠͠

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զʑ͕ѻ͏΋ͷ͸  HPSPVUJOF

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HPSPVUJOF΁  γάφϧΛૹΓ͍ͨ

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݁࿦͔Β

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HPSPVUJOF΁  γάφϧΛૹ৴Ͱ͖ͳ͍

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͕ͩ  ࣅͨΑ͏ͳ͜ͱ͸Ͱ͖Δ

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γάφϧΛ௨஌͢Δ શͯͷ(PSPVUJOF΁ϒϩʔυΩϟετ

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ඞཁͳ͜ͱ w ௨஌༻ͷDIBOOFM w ͲΜͳγάφϧ͕ૹΒΕ͖͔ͯͨ

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ඞཁͳ͜ͱ w ௨஌༻ͷDIBOOFM w ͲΜͳγάφϧ͕ૹΒΕ͖͔ͯͨ

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close(ch)

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close(ch) DIΛ͍࣋ͬͯΔશͯͷHPSPVUJOF΁  DIBOOFMΛૹ৴͢Δ͜ͱ͕Ͱ͖Δ

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ඞཁͳ͜ͱ w ௨஌༻ͷDIBOOFM w ͲΜͳγάφϧ͕ૹΒΕ͖͔ͯͨ

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signal.Notify(ch)

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signal.Notify(ch) DI͔Βड͚औΕ͹ྑ͍

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࣮ࡍͷίʔυ

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γάφϧ௨஌Λߦ͏ߏ଄ମ

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NBJOͷॲཧ

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ΊͬͪΌ؆୯

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͔͠͠ɺզʑ͸  context.Context ΋ཉ͍͠

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context.Context  γάφϧϋϯυϥͷ࣮૷ γάφϧ΋ड͚औΕΔcontext.Context

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context.Context

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context.Context w جຊతʹΩϟϯηϧͷͨΊͷDIBOOFMͷड͚౉͠ Λߦ͏໨తʹ࢖͏ w context.Value ΋͋Δ͕ɺࠓճ͸ؾʹ͠ͳ͍ w JOUFSGBDFͰ͋Δ

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context.Context

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͞͞΍͔ͳϧʔϧ΋ʜ

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IUUQTHPMBOHPSHQLHDPOUFYU l%POPUTUPSF$POUFYUTJOTJEFBTUSVDU UZQFJOTUFBEʜz func DoSomething(ctx context.Context, arg Arg) error {  // ... use ctx ...  }

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ͳΔ΄Ͳ

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͜͜Ͱ  ࣍ͷ63-Λݟ·͠ΐ͏ IUUQTHJUIVCDPN$PEF)FYHPMFUTZOPQTJT

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context.Context  ҰͭͰ྆ํड͚औΕΔ

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࣮૷ IUUQTHJTUHJUIVCDPN$PEF)FY DCFECGDBGGECGB

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ߏ଄ମ΁DUYΛ֨ೲ͢Δ

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൓ٯߦҝͰ͢Ͷ

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JOUFSGBDFͷ࣮૷

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NBJOͷॲཧ

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͜ΕͰԿ͕خ͍͠ͷ͔ʁ

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خ͍͜͠ͱ w ड৴෦෼ͷίʔυ͕؆ܿʹͳͬͯಡΈ΍͘͢ͳΔ w γάφϧͷ௨஌ͱDPOUFYUΩϟϯηϧͷ௨஌ͷ྆ ํΛγϯϓϧʹॻ͚Δ w ϥοϓ͢ΔલͷDPOUFYUͱͯ͠΋ѻ͑ΔͷͰ҆৺

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DPOUFYUͷϥοϓʹ ஫ҙ͢Δ͜ͱ

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஫ҙ͢Δ͜ͱ w ֎෦͔ΒԿ͔͠Β௨஌͕͋ͬͯɺͦΕΛτϦΨʔʹ ֤HPSPVUJOF΁΋௨஌͍ͨ͠৔߹͸ྑͦ͞͏ w Ή΍Έʹϥοϓ͢Δͱத਎͕෼͔Βͳ͍ɺҙਤ͕Θ ͔Βͳ͍໰୊͕ൃੜ͢Δ