Goroutine meets a signal

Go Conference 2018 Spring (https://gocon.connpass.com/event/82515/) でシグナルを Goroutine へブロードキャストする & それを context.Context でラップする話をしました

Transcript

1. (PSPVUJOFNFFUTBTJHOBM
   !(P$POGFSFODF4QSJOH
   

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

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3. View Slide

4. Έͳ͞Μ
   

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5. γάφϧ࢖ͬͯ·͔͢ʁ
   

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6. ࢖ͬͯ·͢ΑͶʂ
   

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7. ஌Βͳ͍ਓͷͨΊʹ
   

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9. શ͘໘ന͘ͳ͍ʜ
   

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10. % man signal
    ʮࠓ͙࣮͢ߦʯ
    

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11. Ͳ͏͍͏࣌ʹ

    γάφϧΛ࢖͍·͔͢ʁ
    

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12. γάφϧΛ࢖͏৔໘
    w ॲཧΛ தஅcऴྃc࠶ىಈ
    ͍ͨ͠
    w ׂΓࠐΈॲཧΛߦ͍͍ͨ
    w γάφϧΛૹΔ͜ͱͰڍಈΛมߋ͍ͨ͠ͳͲ

    ʢϨΞέʔεʁʣ
    

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13. γάφϧ͸ϓϩηεʹ

    ૹΓ·͢ΑͶ
    

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14. ߋʹݴ͏ͱ
    

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15. ਌ϓϩηεࢠϓϩηε

    ΁ͷγάφϧૹ৴΋Մೳ
    

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16. ͔͠͠
    

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17. զʑ͕ѻ͏΋ͷ͸

    HPSPVUJOF
    

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18. HPSPVUJOF΁

    γάφϧΛૹΓ͍ͨ
    

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19. ݁࿦͔Β
    

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20. HPSPVUJOF΁

    γάφϧΛૹ৴Ͱ͖ͳ͍
    

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21. ͕ͩ

    ࣅͨΑ͏ͳ͜ͱ͸Ͱ͖Δ
    

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22. γάφϧΛ௨஌͢Δ
    શͯͷ(PSPVUJOF΁ϒϩʔυΩϟετ
    

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23. ඞཁͳ͜ͱ
    w ௨஌༻ͷDIBOOFM
    w ͲΜͳγάφϧ͕ૹΒΕ͖͔ͯͨ
    

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24. ඞཁͳ͜ͱ
    w ௨஌༻ͷDIBOOFM
    w ͲΜͳγάφϧ͕ૹΒΕ͖͔ͯͨ
    

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25. close(ch)
    

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26. close(ch)
    DIΛ͍࣋ͬͯΔશͯͷHPSPVUJOF΁

    DIBOOFMΛૹ৴͢Δ͜ͱ͕Ͱ͖Δ
    

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27. ඞཁͳ͜ͱ
    w ௨஌༻ͷDIBOOFM
    w ͲΜͳγάφϧ͕ૹΒΕ͖͔ͯͨ
    

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28. signal.Notify(ch)
    

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29. signal.Notify(ch)
    DI͔Βड͚औΕ͹ྑ͍
    

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30. ࣮ࡍͷίʔυ
    

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31. γάφϧ௨஌Λߦ͏ߏ଄ମ
    

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32. NBJOͷॲཧ
    

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33. ΊͬͪΌ؆୯
    

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34. ͔͠͠ɺզʑ͸

    context.Context ΋ཉ͍͠
    

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35. context.Context

    γάφϧϋϯυϥͷ࣮૷
    γάφϧ΋ड͚औΕΔcontext.Context
    

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36. context.Context
    

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

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38. context.Context
    

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39. ͞͞΍͔ͳϧʔϧ΋ʜ
    

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

    // ... use ctx ...

    }
    

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41. ͳΔ΄Ͳ
    

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42. ͜͜Ͱ

    ࣍ͷ63-Λݟ·͠ΐ͏
    IUUQTHJUIVCDPN$PEF)FYHPMFUTZOPQTJT
    

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43. View Slide

44. View Slide

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46. context.Context

    ҰͭͰ྆ํड͚औΕΔ
    

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47. ࣮૷
    IUUQTHJTUHJUIVCDPN$PEF)FY
    DCFECGDBGGECGB
    

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48. ߏ଄ମ΁DUYΛ֨ೲ͢Δ
    

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49. ൓ٯߦҝͰ͢Ͷ
    

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50. JOUFSGBDFͷ࣮૷
    

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51. NBJOͷॲཧ
    

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52. ͜ΕͰԿ͕خ͍͠ͷ͔ʁ
    

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

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54. DPOUFYUͷϥοϓʹ
    ஫ҙ͢Δ͜ͱ
    

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

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56. ༷ʑͳؾ͕࣋ͪ͋Δͱ

    ࢥ͍·͕͢
    

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57. ͝੩ௌ

    ͋Γ͕ͱ͏͍͟͝·ͨ͠
    1MFBTFEJTDVTTXJUINF
    
    

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