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Boost.Asio ೖ໳ @syu_cream

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ΞδΣϯμ Boost.Asio ͷ঺հ جຊతͳಛ௃ ΠϕϯτۦಈͱBoost.Asio εϨουͱBoost.Asio ίϧʔνϯͱBoost.Asio (༨༟͕͋Ε͹)αϯϓϧίʔυಡΈ (ߋʹ༨༟͕͋Ε͹)झຯͰॻ͍͍ͯΔ HTTP/2 ؆қ࣮૷ʹ͍ͭͯ

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Boost.Asio ͱ͸ Boost ͷඇಉظωοτϫʔΫ௨৴ϥΠϒϥϦ ΠϕϯτۦಈI/Oͷαϙʔτ ϓϥοτϑΥʔϜͷࠩҟΛٵऩͯ͘͠ΕΔ ಉظ௨৴΋αϙʔτ

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Asio Ͱαϙʔτ͢Δ௨৴ αϙʔτ͢Δϓϩτίϧͷछྨ TCP/UDP/ICMP ιέοτ γϦΞϧϙʔτ UNIX Domain Socket

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Πϕϯτۦಈͱ Boost.Asio

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Πϕϯτۦಈ I/O ಉ࣌ʹෳ਺ͷ I/O Λॲཧ͢ΔϞσϧ I/Oͷ׬ྃΛݕग़͢ΔΠϕϯτϧʔϓΛ࣋ͭ I/O׬ྃ࣌ʹΠϕϯτϋϯυϥΛ࣮ߦ͢Δ ! " !! !! !! ①"I/O" ! ! " ②"I/O"" !! ③!! "

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Proactor pattern ΠϕϯτۦಈI/OΛ࣮ݱ͢ΔσβΠϯύλʔϯͷҰछ Πϕϯτϧʔϓͱϋϯυϥͷ࣮૷Λ෼཭ લऀ͸OSͷػೳ(select, poll, epoll/kqueueͳͲ)Λར༻ ޙऀ͸ࣗલͰ࣮૷ɻඞཁͳΒεϨουͰฒྻॲཧɻ

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Boost.Asio ʹ͓͚Δ Proactor io_service ΦϒδΣΫτΛհͯ͠ I/O Λॲཧ͢Δ $:@.>< 8A7> I/O$+91*-6$ (:$3/46) io_service +;?B5)A.025< ①$I/O+9 1*-6 ② 8A7> " ③io_service$(run() !( ④$I/O$ ( ⑤$I/O % ,=B#'& io_service$'( ⑥I/O$( 8A7>#&$

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io_service Boost.Asio ͷ௨৴ͷཁͱͳΔΦϒδΣΫτ Πϕϯτϧʔϓͷ࣮ߦ εϨουϓʔϧͷ؅ཧ OS ͷΠϕϯτ௨஌ػߏΛݺͼग़͠ ׬ྃϋϯυϥͷݺͼग़͠

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io_service ͷૢ࡞ io_service::run() ΠϕϯτॲཧϧʔϓΛϒϩοΩϯά࣮ͯ͠ߦ io_service::poll() ΠϕϯτॲཧϧʔϓΛϒϩοΩϯάͤͣʹ࣮ߦ io_service::post() Ωϡʔʹॲཧ͢΂͖ϋϯυϥΛ௥Ճ io_service::dispatch() ʢՄೳͰ͋Ε͹ʣ౉ͨ͠ϋϯυϥΛଈ࠲ʹ࣮ߦ

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Asio ʹΑΔඇಉظTCP௨৴ boost::asio::ip::tcp::socket TCPιέοτΛදݱ͢Δ I/O ΦϒδΣΫτ boost::asio::async_connect ඇಉظʹ connect ͢Δ boost::asio::ip::tcp::socket::async_accept ඇಉظʹ accept ͢Δ boost::asio::async_(read | write) ඇಉظʹ read/write ͢Δ

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εϨουͱ Boost.Asio

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εϨουͱͷؔ܎ εϨουϓʔϧ ׬ྃϋϯυϥͷॲཧΛ؆୯ʹϚϧνεϨουԽՄೳ io_service::run() Λෳ਺εϨου͔Βݺͼग़͢ͱε Ϩουϓʔϧ͕ߏங͞ΕΔ ಺෦εϨου ϗετ໊ղܾͳͲϥΠϒϥϦ಺ͰฒྻԽ͞ΕΔ

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ίϧʔνϯͱ Boost.Asio

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׬ྃϋϯυϥͷ࣮૷1: ී௨ʹίʔϧόοΫؔ਺Λఆٛ ఆ൪ͷ׬ྃϋϯυϥͷॻ͖ํ ͨͩ͠ίʔυͷݟ௨͠͸ѱ͘ͳΔɻ

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׬ྃϋϯυϥͷ࣮૷2: ແ໊ؔ਺Λ࢖͏ ؔ࿈͢Δॲཧͷهड़Λू໿Ͱ͖Δ ͔͠͠ɺωετ͕ਂ͘ͳΔɻ

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׬ྃॲཧͱίϧʔνϯ ௨৴ॲཧ͸ஞ࣍తʹهड़ग़དྷͨํ͕௚ײత ෳ਺ճͷର࿩Λཁ͢Δϓϩτίϧ͠Ό΂Δ৔߹ͳͲ ॲཧ͕ෳࡶʹͳΔͱίʔϧόοΫ஍ࠈʹؕΔ ! Boost 1.53 ͔ΒBoost.Coroutine Λαϙʔτʂ ஞ࣍ॲཧͬΆ͘ඇಉظ௨৴ॲཧ͕هड़Ͱ͖Δ

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׬ྃϋϯυϥͷ࣮૷3: ελοΫϨείϧʔνϯ Boost.Coroutine Λ࢖ͬͯஞ࣍ॲཧతʹهड़ reenter() ʹίϧʔνϯͰ࣮ߦ͢ΔॲཧΛهड़ I/O ͢Δࡍ͸ yield ͰίϯςΩετΛ”ৡΔ” reenter() ֎ʢؔ਺ݺͼग़͠ઌͳͲʣͰ͸ yield Ͱ͖ͳ͍͜ͱʹ஫ҙ

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׬ྃϋϯυϥͷ࣮૷4: ελοΫϑϧίϧʔνϯ boost::asio::spawn() ʹίϧʔνϯΛ౉͚ͩ͢ Boost.Coroutine ͷهड़Λҙࣝ͠ͳͯ͘ྑ͘ͳΔ ελοΫϨείϧʔνϯͱҧ͍ɺݺͼग़͠ઌͷؔ਺಺Ͱ yield Մೳ yield_context Λ఻ൖ͢Δඞཁ͸͋Δ

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·ͱΊ Boost.Asio ͸ඇಉظ I/O ॲཧͷهड़ʹศར ΠϕϯτۦಈɺϓϥοτϑΥʔϜඇґଘͷ هड़ΛӅṭՄೳ ඇಉظॲཧͷهड़΋ൺֱత༰қ