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111.A.B.C.D.2.A.B.C.CPUD.3.A.B.C.D.4.A.B.C.D.5.A.B.C.D.6.A.B.C.D.7.A.B.2C.D.8.UNIXfork()main(){pid_tpid;pid=fork();if(pid==0)printf(HelloWorld\n);elseif(pid0)printf(HelloWorld\n);elseprintf(HelloWorld\n);}A.B.1HelloWorldC.2HelloWorldD.3HelloWorld9.Pthreadpthread_joinA.B.C.D.10.A.B.C.D.11.A.B.C.D.12.PVmutex1kk1mutexA.kB.k-1C.1-kD.-k13.BAABcount.A//Acount.B//B{,3P(count.A);select_course(A);relese_course(B);V(count.B);,}ABA.B.C.D.14.A.B.C.D.15.A.B.C.D.16.2GB4KB4A.128B.256C.512D.102417.BeladyA.FIFOB.LRUC.LFUD.OPT18.A.B.C.D.19.5032for(i=1;i=50;i++)4for(j=1;j=100;j++)C[i,j]=0;A.50B.100C.150D.500020....A.B.C.D.21.A.B.C.D.22.A.B.C.D.23.100801024A.8%B.16%C.24%D.32%24.10080102412A.32%B.64%C.80%D.94%25.A.B.C.5D.26.A.B.C.D.27.I/OA.SPOOLingB.I/OC.D.28.A.B.PVC.SPOOLingD.29.A.B.C.D.30.73A.1B.2C.3D.431.A.EthernetB.ARPANETC.TokenRingD.TokenBus32.TCP/IPA.TCPB.ARPC.UDPD.CMP33.A.6B.C.D.34.OSIA.B.C.D.35.IEEEWLANA.IEEE802.11B.IEEE802.12C.IEEE802.15D.IEEE802.1636.14.4Gbps12A.6B.5C.4D.337.A.B.C.D.38.EthernetA.B.C.D.39.A.B.C.D.40.IP202.113.25.36255.255.255.0202.113.26.0255.255.255.0A.202.113.26.0B.202.113.26.255C.202.113.25.0D.202.113.25.25541.MTUMTUA.7B.C.D.42.Q10.4.0.0A.10.4.0.7B.10.3.0.7C.10.2.0.6D.10.2.0.543.IPA.DIPB.C.D.44.IPv62100:0000:0000:02AA:000F:0000:FE08:9C5AA.2100::02AA:000F:0:FE08:9C5AB.21::02AA:000F:0:FE08:9C5AC.2100::02AA:000F::FE08:9C5AD.2100::2AA:F::FE08:9C5A45.-A.B.C.D.46.DNSA.B.C.D.TTL47.POP3A.PASSB.RETRC.STATD.NOOP48.8A.TelnetB.SNMPC.FTPD.SMTP49.HTMLA.DB.CRC.LFD.P50.A.B.RFC2778C.C/SD.51.IMA.SIPSIMPLEB.QQSIPC.XMPPJABBERD.SIP52.NFSA.NFSB.C.WindowsNFSD.NFSP2P53.NetBIOSA.UnixB.15C.SMBD.54.P2PA.BitTorrentB.MazeC.D.PP55.A.B.C.D.56.X.800A.IETFB.C.D.957.BlowfishA.FishB.C.64D.3258.KerberosA.B.MITC.D.59.A.A1B.B1C.C1D.D160.IPA.B.C.D.61.A.B.C.D.E.62.A.B.C.D.E.63.A.B.C.D.E.1064.Nproducer(){intitem;while(TRUE){item=produce_item();P(empty);P(mutex);insert_item(item);V(mutex)V(full);}}consumer(){intitem;while(TRUE){P(full);P(mutex);item=remove_item();V(mutex);V(mutex);consume_item(item);}}A.emptyNB.full0C.mutex0D.P(full)P(mutex)E.V(mutex)V(mutex)65.A.B.C.D.E.66.A.TLBB.C.D.E.67.A.B.C.11D.E.68.A.B.C.D.I/OE.DMA69.CPUA.B.C.D.DMAE.70.A.B.C.D.E.71.TCP/IPA.7B.ISOC.D.E.72.A.VLANB.WSNC.WMND.ATME.FDDI73.A.1000Base-TB.1000Base-CXC.1000Base-LXD.1000Base-SXE.1000Base-W74.InternetA.HFCB.HFC12C.ADSLD.ADSLE.HFC75.RIPA.B.C.D.E.76.HTTPA.B.WebC.WebD.WebE.TCP77.IPA.B.C.D.E.QoS78.IPA.B.C.D.E.79.A.B.C.D.E.80.IPSecA.B.AHESPC.SPI64D.AHIPIPE.SA131-5CADAA6-10BACCD11-15CDCDB16-20CADBD21-25ACADA26-30DDDAC31-35BCDBA36-40ABDAB41-45CCDAC46-50BCADB51-55CCBBA56-60BCADC61.CDBA62.EBA63.DEA64.DC65.EACD66.CEAD67.CBEA68.CBA69.DECA70.AEC71.DBA72.CB73.ABE74.DAC75.DEB21.A.B.C.D.2.A.B.C.D./3.A.B.C.D.4.I/O14A.B.C.D.5.A.B.C.D.6.A.CPUB.C.D.CPU7.LinuxLinuxA.B.C.D.8.UNIXmain(){printf(HelloWorld\n);fork();printf(HelloWorld\n);}A.1HelloWorldB.2HelloWorldC.3HelloWorldD.4HelloWorld9.Pthreadpthread_yieldA.CPUB.C.D.10.A.B.C.I/OD.11.215A.B.C.D.12.SP(S)SA.1B.C.1D.13.A.B.C.D.14.A.B.C.D.15.A.B.C.D.16.32210A.210B.220C.222D.23217.A.B.C.D.18.LRUA.B.C.D.19.316060151541252452353OPTA.10B.9C.8D.720.A.B.C.D.B+21.A.B.C.D.22.A.B.C.D.23.UNIX1210101112100A.10010B.10110C.10100D.1100024.UNIX12101011121001000A.2B.3C.4D.525.A.B.C.D.26.17A.B.C.D.27.I/OA.B.C.D.28.A.B.C.D.29.A.B.C.D.30.A.B.C.D.31.OSIA.ISOB.IEEEC.IETFD.ARPA32.A.B.C.D.33.5MB0.04sA.12.5MbpsB.100MbpsC.125MbpsD.1Gbps34.A.18B.C.D.35.EthernetA.1B.1C.7D.736.A.B./MACC.D.WCDMA37.IEEE802.11bA.2MbpsB.11MbpsC.54MbpsD.100Mbps38.A.B.C.D.IEEE802.3ae39.IEEE802.3EthernetA.32BB.46BC.48BD.64B40.ADSLA.B.C.D.41.IPA.B.C.D.42.IP202.113.25.36255.255.255.0202.113.26.0A.202.113.26.0B.202.113.26.255C.202.113.25.36D.202.113.25.2551943.IP100A.100B.200C.400D.80044.10.1.0.3510.4.0.78IP255.255.192.010.2.0.0255.255.192.010.3.0.0255.255.192.010.1.0.010.2.0.5255.255.192.010.4.0.010.3.0.7A.10.2.0.5B.10.3.0.7C.10.2.0.35D.10.4.0.7845.P2PA.B.C.D.46.DNSAA.B.C.D.47.FTPA.B.C.D.48.base64A.ASCIIB.C.D.49.TelnetNVTA.B.C.D.50.QQA.QQDNS20B.QQMSNC.QQD.51.IMA.MSNH.323B.QQJABBERC.AOLOSCARD.ICQSIMPLE52.XMPPA.GoogleTalkXMPPB.E-mailC.D.P2P53.CIFSA.B.C.D.54.BitTorrentA.P2PB.TrackerC.TrackerD.55.A.B.C.D.56.A.B.IETFCMIPC.D.57.SNMPA.B.TCP/IPC.MIBD.58.A.B.C.D.59.ElGamal21A.IETFB.C.D.60.X.509A.IEEEB.C.CAD.ASN.161.A.B.C.D.E.62.A.B.C.D.E.63.A.B.C.D.E.64.Reader(){while(TRUE){P(mutex);rc=rc+1;if(rc==1)P(w);V(mutex);P(mutex);rc=rc-1;if(rc==0)V(w);22V(mutex);}}writer(){while(TRUE){,,P(w);V(w);}}A.w0B.mutex1C.rc0D.P(mutex)rc=rc+1E.65.A.B.C.D.E.66.A.B.C.D.E.67.A.B.C.RAIDD.E.68.FATA.FATB.FAT1616C.FATWindowsD.FAT16255E.FAT69.I/OI/OA.23B.C.D.E.70.A.B.C.D.E.71.LinuxA.B.UnixC.D.E.Internet72.A.B.C.D.E.73.GigabitEthernetA.IEEE802.3zB.1GbpsC.D.GMIIMACE.74.InternetA.B.C.D.E.75.RIPOSPFA.RIP-B.OSPF-C.RIPOSPFD.OSPFRIPE.RIP76.A.Web24B.WebC.WebD.SSLE.Internet77.A.B.C.TTLD.E.78.VoIPA.B.C.D.E.79.S/MIMEA.PGPB.C.OutlookExpressS/MIMED.IPSecE.DSS80.A.B.C.D.E.1-5DDCCB6-10ABCAD11-15ACBCB16-20CDBDA21-25AABAD26-30CCDCC31-35ADDCC36-40DBDDA41-45CCDBA46-50BCADA51-55CDBBC56-60CDBCB61.EBC62.CDA63.EADC64.DEA65.DC66.ACEB6