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The NotImplementedError Problem in Ruby

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The NotImplementedError Problem in Ruby

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Koichi ITO

June 06, 2026

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  2. ຊདྷͷ/PU*NQMFNFOUFE&SSPSྫ $ ruby -ve 'Process.fork' jruby 10.0.5.0 (3.4.5) 2026-04-06 5db1ba72f3

    Java HotSpot(TM) 64-Bit Server VM 24.0.1+9-30 on 24.0.1+9-30 +indy +jit [arm64-darwin] NotImplementedError: fork is not available on this platform fork at org/jruby/RubyKernel.java:2073 fork at org/jruby/RubyProcess.java:1927 <main> at -e:1 ͜ͷ+3VCZ؀ڥͰ͸1SPDFTTGPSL͕࣮૷͞Εͯ ͍ͳ͍ͨΊɺ/PU*NQMFNFOUFE&SSPS͕ൃੜ͢Δ
  3. w ޡղ΍֬৴తͳޡ༻Ͱ/PU*NQMFNFOUFE&SSPSΛ࢖͏ ؾ࣋ͪ͸Θ͔Βͳ͘ͳ͍  w /P.FUIPE&SSPSͰ୅༻͢Δ FH SVCPDPQ  w

    τοϓϨϕϧͷΧελϜྫ֎ΫϥεΛ࡞Δ ΈΜͳ໋໊ʹ೰Ή  w "QQ/BNFTQBDF/PU*NQMFNFOUFE&SSPSΛఆٛ͢Δ NPEVMF໊લۭؒԼͰ'2/Ͱͳ͍ఆٛ࣌ʹࠞཚͨ͠ ݱ৔Ͱͷࣄྫ
  4. ՝୊4UBOEBSE&SSPSܧঝͷྫ֎৽ઃ͸ʁ 4UBOEBSE&SSPS 4DSJQU&SSPS &YDFQUJPO 4UBOEBSE&SSPSܧঝͷ৽ઃྫ֎Ϋϥε ʹҠߦͨ͠ίʔυͰͷϢʔβʔӨڹ w طଘίʔυ͕SFTDVFͰ /PU*NQMFNFOUFE&SSPSΛࢦఆͯ͠ ͍Δ৔߹ʹัଊͰ͖ͳ͘ͳΔඇޓ׵

    ِӄੑ  w SFTDVFͰ4UBOEBSE&SSPSͱ͍ͯ͠Δ ৔߹ʹัଊ͢ΔΑ͏ʹͳΔඇޓ׵ ຊདྷ4UBOEBSE&SSPSͳΒਅཅੑ  /PU*NQMFNFOUFE&SSPSͷҙຯͷมߋ ͸ഁյతมߋ͗͢ΔͷͰ͠ͳ͍લఏ ͬ͘͠Γ͘Δ໊લͷ ৽ͨͳྫ֎Ϋϥε /PU*NQMFNFOUFE&SSPS ϓϩάϥϛϯάͰͷόάͳͷͰ&YDFQUJPOͰͳ͘4UBOEBSE&SSPSܧঝͩͱࢥ͏ɺͲ͏ʁ ฤू஫͜ͷ೔ͷ2"ίʔφʔͰ4DSJQU&SSPSܧঝͱ͢΂͖ͱ͍͏ճ౴ͱͳΓ·ͨ͠
  5. ϢʔβʔͷϚΠάϨʔγϣϯύε 4UBOEBSE&SSPS 4DSJQU&SSPS &YDFQUJPO 4UBOEBSE&SSPSܧঝͷ৽ઃྫ֎Ϋϥε ʹҠߦͨ͠ίʔυͰͷϢʔβʔӨڹ w طଘίʔυ͕SFTDVFͰ /PU*NQMFNFOUFE&SSPSΛࢦఆͯ͠ ͍Δ৔߹ʹัଊͰ͖ͳ͘ͳΔඇޓ׵

    ِӄੑ  w SFTDVFͰ4UBOEBSE&SSPSͱ͍ͯ͠Δ ৔߹ʹัଊ͢ΔΑ͏ʹͳΔඇޓ׵ ຊདྷ4UBOEBSE&SSPSͳΒਅཅੑ  /PU*NQMFNFOUFE&SSPSͷҙຯͷมߋ ͸ഁյతมߋ͗͢ΔͷͰ͠ͳ͍લఏ ͬ͘͠Γ͘Δ໊લͷ ৽ͨͳྫ֎Ϋϥε /PU*NQMFNFOUFE&SSPS /PU*NQMFNFOUFE&SSPSΛΦʔόʔϥΠυ࣮૷༻్ʹ ࢖͍ͬͯΔϓϩάϥϜͷΈ৽ઃྫ֎Ϋϥεʹஔ͖׵͑ <<migration>> ݱߦ࢓༷Ͱͷ ར༻ͳΒҡ࣋ ฤू஫͜ͷ೔ͷ2"ίʔφʔͰ4UBOEBSE&SSPSͰ͸ͳ͘4DSJQU&SSPSܧঝͱ͢΂͖ͱͷճ౴
  6. w /PU*NQMFNFOUFE:FU&SSPS 2VJOUBTBO  w 5P#F%F fi OFE&SSPS NBU[ 

    w "CTUSBDU.FUIPE&SSPS 2VJOUBTBO  w 4VCDMBTT3FTQPOTJCJMJUZ&SSPS /JUIJO ՝୊CVHTͰग़͍ͯΔ໋໊Ҋ͕͋Δ͚Ͳ໊લ͸ʁ ύονձͰग़ͨ+BWBͷ6OTVQQPSUFE0QFSBUJPO&YDFQUJPO໋໊૬౰Ҋ΋Ͱ͚ͨΕͲ 3VCZ͸3VCZͳͷͰ෼͔Γқ͍ ฤू஫͜ͷൃදޙͷ2"ίʔφʔͰ4VCDMBTT3FTQPOTJCJMJUZ͔"CTUSBDU.FUIPE&SSPS͕༗ྗےͱͷճ౴