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オープンソースの組み込みOSを用いた「オペレーティングシステム」の実習

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(1)   OS 

(2) .   Exer cises Using an Op en Source Embedded OS for "Operating Systems" Course.   Hide ka zu S hioza wa ŧòßãóãǖZkaEFBSDG~WãŻDZ 194-8610 ĺŠǗŮŭôŧòãÓ6-1-1 Department of Software Science, College of Engineering, Tamagawa University, 6-1-1 Tamagawagakuen, Machida, Tokyo 194-8610. Abstract Department of Software Science, Tamagawa University offers the subject "Operating Systems" since 2006. This paper reports the exercises using an open source embedded operating system in this course for the students to understand internal structures and algorithms of operating systems. As a result of evaluating several open source operating systems for the course, the author selected HOS (Hyper Operating System) developed based on the ITRON specifications. It is expected that the programming exercises using a real operating system help students understand and investigate more practically how operating systems work internally.. Keywords: programming exercises, educational operating system, embedded OS, computer science education 1. *5(. ơ><# ;ƥǥ'ªũ?v€Tĉƾ;Ą.  ZkaEFBSDG~WãŻ$*DZ3÷Ň2. Ʀ*' Dz8. *4÷Ň)Żų%#In{€_C~NUW_. s€V#ĒƢű(ũƬ;)*DZĄ6èĬ. rǝƽ<# ;Dz)Żų_€p%;. '%$*' Dz. In{€_C~NUW_rǯOSǰ*DZƥǥ'Q~.  $DZßã)ìǜĢƛ$*DZƽƗ$'DZ. ju€[UW_r?¸ 5('#*'9. Z€WQ€b¤ǝ<ǯI€m~Z€W)ǰ. ' ZkaEFB$:DZ ×ĸZkaEFB%. In{€_C~NUW_r?–. 6Ì+<;Dzƣű'OS%#*DZWindowsDZ. ǐ?ƻ/:DZƞ¬$ħ ņƝ?Ǎ¶:DZ. macOSDZLinux'&8ŵ9<# ;Dz. ǖ)ªũ?ğǐ:;8 'çƘ?À:.  )Żų*DZOS)×ĸű'§ǖłǐ7BzRy. ¢<# ;—ǯš(œÝ(ǰÞ DzZkaEF. Xr?ã-6)$:DZßã)ćØƎǯZkaE. BUW_r)¸•?ŵ;(*DZZ€WQ€b?ƹ. FBƎǰãŻ$*Ɵű'§è$;Dz DZ. 4)IJ6ŕũƬ$;ĨŐ% ;Dz. OS)‡Ʀǖ¬*ǏöǣƠ<#

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(14) Memoirs of The College of Engineering, Tamagawa University, No.53 (2018). /* [WM)㨠*/ const T_CTSK ctsk1 = { TA_HLNG | TA_ACT, 0x1234, task1, 5, 256, NULL }; const T_CTSK ctsk2 = { TA_HLNG | TA_ACT, 0x1234, task2, 5, 256, NULL }; /* [WM)ūĎªũ */ void start(VP_INT exinf) { cre_tsk(1, &ctsk1); /* [WM ID 1 */ cre_tsk(2, &ctsk2); /* [WM ID 2 */ } /* [WM 1 )ªũ */ void task1(VP_INT exinf) { SYSTIM st; for (;;) { get_tim(&st); /* ƒǓĭǞ)Àā */ printf("1: %ld sec¥n", st.ltime/1000); dly_tsk(2000); /* ĖæĭǞň */ } } /* [WM 2 )ªũ */ void task2(VP_INT exinf) { SYSTIM st; for (;;) { get_tim(&st); /* ƒǓĭǞ)Àā */ printf("2: %ld sec¥n", st.ltime/1000); dly_tsk(3000); /* ĖæĭǞň */ }. /* [WM 1 )ªũ */ void task1(VP_INT exinf) { int i; for (i = 0; i < 20; i++) { delay(); printf("1"); delay(); /* )[WM(ƞ‡ű(ªũ?ƿ; */ // rot_rdq(5); /*  ¡ù 5 )Lu€ */ } ext_tsk(); } /* [WM 2 )ªũ */ void task2(VP_INT exinf) { int i; for (i = 0; i < 20; i++) { delay(); printf("2"); delay(); /* )[WM(ƞ‡ű(ªũ?ƿ; */ // rot_rdq(5); /*  ¡ù 5 )Lu€ */ } ext_tsk(); }. (a) main.c 9ǖēƍ /* [Dpµ:NJ3f~bx */ void OsTimer_Handler(VP_INT exinf) { ID id;. }. isig_tim(); if (iget_tid(&id) != E_OK) return;. Ñ 1 pz][WM)ƺǫm|Nxr. /* // // //. ǯmain.c 9ēƍǰ. Ñ1)©Ǫ(;[WM)ƱæćØ$ĖæÂƝ$ ;DzãƘƚ*DZÇ[WM)çơǨø7 ¡ù?. {`CLu€)Ïljǯû²ű'[WM­ı ǰ */ irot_rdq(3); /*  ¡ù 3 */ irot_rdq(4); /*  ¡ù 4 */ irot_rdq(5); /*  ¡ù 5 */. }. Üį# ! )Ƒ3È>?ƴDZ<9) ·ļ(! #ũƬ;%Ō5<;Dz ƺǫ6c e~myG~m_Cl'pz][WM.  e~myG~m_Cl'pz][WM%*DZÇ m|YWƞ‡ű(çơŅ?Đġ%$DZƥģ m|YW) ®ű'çơ?çŨ;ĨŐ$;Dz )ƺǫ$*DZ)¸•%m|Nxq~N•Ő? ũƬ;DzITRON* ¡ù%({`CLu€? ĕDZrot_rdqǯrotate ready queueǰ% API(8 #Ň)[WM(çơ?ż%$;DzÑ2 *ƺǫ)m|Nxr)ǖ$:DZãƘƚ*(a)) †)rot_rdqǟģ?Ĵ·(DZçơƓļ?ƙê;Dz. (b). ostimer.h 9ǖēƍ. Ñ 2 WOVu€y~Nªũ)ƺǫm|Nxr. '

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(17) Memoirs of The College of Engineering, Tamagawa University, No.53 (2018). m|YW)­:ı ?ơ DzITRON$*DZ<* [Dp€µ:NJ3ªũ)†$DZirot_rdqǯrot_rdq) µ:NJ3빊ǰ?–. #{`CLu€?Ïlj. ;%$çŨ$;DzÑ2(b)*DZHOS?Windows $¸ ÙÈ)[Dp€µ:NJ3ªũ)Gqu. /* YpkH$ä;/¥ĴǃŚ */ int shared = 0; /* Dž¸z€]~ */ void start(VP_INT exinf) { int i; /* YpkH)ūĎ */ cre_sem(SEMID, &csem);. {€Uw~ǖ¬$:DZãƘƚ*)†)irot_rdq ?Ĵ·(#DZçơƓļ?ƙê;Dz. /* É[WM)Qj€10 œ)ūĎ */ for (i = 1; i <= 10; i++) { cre_tsk(i, &ctsk); }. 3.3 Éĵªũ(ǟ;çƘ  ƃ9Ï%ƃ10Ï)$*DZ¥ĴǃŚ(ǟ;ʍ. }. ²Ă%m|YW)Éĵªũ(! #ã-DZm|. /* [WMǟģ */ void task(VP_INT exinf) { int a;. Nxq~NçƘ;)*DZƃ10Ï$;Dz ƺǫ10a YpkH?–. ʍ²Ă.  YpkH%*DZ Ŋ:ģ?ƣž)JE~[. /*  9 shared )My_CJzYMUw~ */. $:DZ¥ĴǃŚ)ʍ²Ă(Ŭ 9<;Dz) ƺǫ$*DZʍ²Ă)ĄƦĆ%)5)Ypk. a = shared; a += 10; printf("read : %d¥n", a);. H)– Ĩ?DZçǢ)m|Nxq~N?Ǐ#ã. work_something(); /* ĭǞſ)ªũ */. -DzITRON$*DZYpkH)PĞ•ǯťāĞ•ǰ*. shared = a; printf("write: %d¥n", shared);. wai_semǯwait semaphoreǰ DZVĞ•ǯƬġĞ•ǰ*. /* 2$ shared )My_CJzYMUw~ */. sig_semǯsignal semaphoreǰ% API?Ŭ ;Dz Ñ3*ƺǫm|Nxr)ǖ$:DZ¥ĴǃŚ( BMYW# ;ǩÖǯMy_CJzYMUw~ǰ ?wai_sem%sig_sem$*4%$DZǔ­'ʍ ²ĂçŨ$;DzãƘƚ*DZYpkH)ŒƑ3 %þµ(! #ũƬ;%Ō59<;Dz ƺǫ10b `^b|^M%ʍ²Ă.  `^b|^M%*DZƥģ)m|YWƥģ)ǃ Ś)ťā?8 %;%(DZ

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(20) ;[WMǞǏš.  ĸŻų$*DZm|YWǞǏš(Þ)ĭǞ*µ ' DZ)ƺǫ$*×ĸű'm|YWǞǏš ǯ[WMǞǏšǰ(! #DZm|Nxq~N?” Ǯ;DzITRON(* ! )[WMǞǏšņƝ ;DZƺǫ)m|Nxr$*Ĥâ®ǯ)  2:ǰ?ǎÁš;3$;s^Y€Vg^ kA?–Ŭ;DzãƘƚ*DZsnd_mbfǯsend message bufferǰ?±Ŭ;ǎš[WM%DZrcv_mbfǯreceive message bufferǰ?±Ŭ;Áš[WM)ªũ?ũ ƬDZǎšž%Ášž)ëą?ƥģëƥģ(; '&#DZš(ǧÉĵű'm|YWǞǏš(! #ũƬ;%Ō59<;Dz. Ō59<;Dz ŧòßãóãǖƏƦ ƃ 53 Åǯ2018 5 Memoirs of The College÷ǰ of Engineering, Tamagawa University, No.53 (2018). 53.

(21) Memoirs of The College of Engineering, Tamagawa University, No.53 (2018). 3.4 styƉũ(ǟ;çƘ. 4.

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(24) DZ. &DZŨÔHOS$*çŨ$# ' çƘ)çŨ?.  9sty?µ:ü#;%Þ DZ×ĸ. ųĖ#  Dz. ű'ƙ Ĩ*DZ¸ű'µ:ü#ªũ%¥Ǐ$;Dz ƺǫ)m|Nxr$*get_mplǯget memory poolǰ. ¿ƙĤŤ. %rel_mplǯrelease memory poolǰ% API?ƕ:. 1) P€y€c^a: çƘLinuxJ€dzũƼ. Nj (ƁǩÖ)ƔgDaģ*dž:# ;. %çƘ J€dz?·Ŧű(ũƬ;5)çƘ. *')(DZĦş¹(8. #ħ(sty?Ŷ™. İ, Œŭ(Ʋ), jBZ~G`uO€Uw~, (2001).. $' Ũǁ?Űū;DzãƘƚ*)¾Ð(. 2) A. S. [d~gEr : In{€_C~NUW. ! #ƙê;%Ō59<;Dz. _rǯƃ2ŠǰƱƮ%ũƼ

(25) 8,MINIX(8;ç Ƥ, ‹ŏ(Ų), jBZ~G`uO€Uw~, (1998).. 3.5 Űïƺǫ. 3) (Ź)a|~»“ ITRONŒŃĿƯNz€m:.  IJĀ(DZãƘƚOS)§ǖªũ(! #8:ŕ. ITRON4.0ŒŃ Ver. 4.02.00, (1999).. ã@$ . http://www.ertl.jp/ITRON/SPEC/mitron4-j.html. %;5(DZŰïƺǫ%. #HOS)Z€WQ€b?ƬĻ;ƺǫ?«. 4) Project HOS ( ŗ ‚ Ƃ Æ  ): Hyper Operating. # ;Dz '9DZçǢ)%=*<9). System (ITRONŒŃOS), (19988:¤ǝ).. ƺǫ?ě«;ƚ*0%@& ' ŢŎ$;Dz. https://sourceforge.jp/projects/hos. ƺǫ14a rot_rdq )§ǖªũ?Ƨ#38. 5) ŝ¾Íī: ITRONm|Nxq~N¢ǜH8p.  HOS)Z€WQ€b 9DZƃ6Ï)çƘƺǫ$. DQ~%HOS$à5;Ƒ3NJ3ǝŰ, I€rŹ,. Ŭ rot_rdq)ªũ)‡Ʀ'ǖ¬?ēƍ6. (2005).. )½³ǘõ<;)$DZǑƓyWa(8;{. 6) ÚŜźÍ: In{€_C~NUW_rėŀǃ. `C€Lu€)ƉũĨŐ(! #ũƬ;Dz. ĥ, (2017). http://vilab.org/lecture/?OS. ƺǫ14b get_mpl )§ǖªũ?Ƨ#38.  HOS)Z€WQ€b 9ÉDZƃ11Ï)çƘ. 14 2018÷3ij1ξƀÁŽDZ2018÷3ij14Īęǚōæ. ƺǫ$Ŭ get_mpl)ªũ)‡Ʀ'ǖ¬?ēƍ. Received, March 1, 2018; accepted, March 14 14, 2018. 6)½³ǘõ<;)$DZǑƓyWa( 8;ÂÜǛstyl|^M)styǩÖ)Ɖũ ĨŐ(! #ũƬ;Dz ŧòßãóãǖƏƦ ƃ 53 Åǯ2018 ÷ǰ ⋢ᕝ኱ᏛᕤᏛ㒊⣖せࠉ➨53ྕ 㸦2018㸧 54. 6.

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