Umsebenzi wefork() usetshenziselwa ukwakha inqubo entsha ngokuphindaphinda inqubo ekhona ebizwa ngayo. Inqubo ekhona lo msebenzi obizwa ngayo iba inqubo yomzali futhi inqubo esanda kwakhiwa iba inqubo yengane.
Kungani imfoloko isetshenziswa ku-Unix?
fork() yindlela odala ngayo izinqubo ezintsha ku-Unix. Uma ushayela imfoloko , udala ikhophi yenqubo yakho enendawo yayo yekheli. Lokhu kuvumela imisebenzi eminingi ukuthi isebenze ngokuzimele komunye nomunye njengokungathi ngayinye inenkumbulo egcwele yomshini yona ngokwayo.
Yenzani imfologo ()?
Ifork yesistimu () isetshenziselwa ukudala izinqubo. Inhloso yefork() ukudala inqubo entsha, eba inqubo yengane yomuntu ofonayo. Ngemuva kokuthi kudalwe inqubo entsha yengane, zombili izinqubo zizosebenzisa umyalo olandelayo kulandela ikholi yesistimu ye-fork().
Ayini amafoloko ku-Linux?
Kusuka ku-Wikipedia, i-encyclopedia yamahhala. Kukhompyutha, ikakhulukazi kumongo wesistimu yokusebenza ye-Unix nokufana kwayo nokusebenza, imfoloko kuwumsebenzi lapho inqubo izenzela khona ikhophi yayo. Iwukuxhumana okudingekayo ukuze kuthotshelwe i-POSIX kanye namazinga Okucaciswa Okukodwa kwe-UNIX.
Uma inqubo yenziwa ngemfoloko?
I-Fork() idala umongo omusha ngokusekelwe kumongo wenqubo yokubiza. I-fork() ikholi ayijwayelekile ngoba ibuya kabili: Ibuyela kuyo yomibili inqubo yokubiza i-fork() kanye nenqubo esanda kwakhiwa. Inqubo yengane ibuyisela uziro futhi inqubo yomzali ibuyisela inombolo enkulu kunoziro. pid_t imfoloko(engenalutho);
Uyibulala kanjani inqubo yemfoloko?
Fork() ibuyisela uziro(0) kunqubo yengane. Uma udinga ukunqamula inqubo yengane, sebenzisa umsebenzi othi kill(2) onenqubo ye-ID ebuyiselwe ngefork(), kanye nesiginali ofisa ukuyiletha (isb. SIGTERM). Khumbula ukushayela u-wait() kunqubo yengane ukuvimbela noma yimaphi ama-zombies.
Iyini i-exec () ikholi yesistimu?
I-exec system call isetshenziselwa ukwenza ifayela elihlala kwinqubo esebenzayo. Lapho i-exec ibizwa ngokuthi ifayela langaphambilini elisebenzisekayo liyashintshwa futhi ifayela elisha liyakhishwa. Ngokunembayo, singasho ukuthi ukusebenzisa i-exec system call kuzothatha indawo yefayela noma uhlelo oludala olusuka enqubweni ngefayela noma uhlelo olusha.
Kwenzekani uma imfoloko ibizwa izikhathi ezi-3?
Uma umzali nengane beqhubeka nokusebenzisa ikhodi efanayo (okungukuthi abalihloli inani lokubuyisela lefork() , noma i-ID yabo yenqubo, kanye negatsha ezindleleni zekhodi ezihlukene ngokusekelwe kuyo), khona-ke imfologo ngayinye elandelayo izoyiphinda kabili inombolo yezinqubo. Ngakho-ke, yebo, ngemva kwamafoloko amathathu, uzogcina unezinqubo ezingu-2³ = 8 sezizonke.
Ibuyiselani imfologo () ngo-C?
BUYISA INANI
Lapho kuqedwa ngempumelelo, i-fork() ibuyisela u-0 kunqubo yengane futhi ibuyisela i-ID yenqubo yenqubo yengane kunqubo yomzali. Uma kungenjalo, -1 kubuyiselwa kunqubo yomzali, ayikho inqubo yengane edalwayo, futhi i-errno isethelwe ukukhombisa iphutha.
Ingabe i-Pid_t iyinhlangano?
Icaphuna kubhukwana le-libc: Uhlobo lwedatha ye-pid_t luhlobo lwenombolo esayiniwe olukwazi ukumela i-ID yenqubo. Ku-GNU C Library, lokhu kuyi-int. izinhlobo zedatha ezigcina ngokuthi “_t”, ngokuvamile ziwuhlobo oluhlukanisiwe ku-C no-C++ njengomthetho ongabhalwanga.
Ngiyisebenzisa kanjani imfoloko ku-Linux?
I-syntax ye-fork() call system ku-Linux, Ubuntu imi kanje: pid_t fork(void); Ku-syntax uhlobo lokubuyisela lithi pid_t. Lapho inqubo yengane idalwe ngempumelelo, i-PID yenqubo yengane ibuyiselwa ngenqubo yomzali futhi u-0 uzobuyiselwa kunqubo yengane ngokwayo.
Isebenza kanjani i-Linux Fork?
Umsebenzi wefork() ukhethekile ngoba empeleni ubuyela kabili: kanye kunqubo yomzali kanye nenqubo yengane. Enqubweni yomzali, i-fork() ibuyisela i-pid yengane. Enqubweni yengane, ibuyisela u-0. Uma kwenzeka iphutha, ayikho inqubo yengane eyenziwa futhi -1 ibuyiselwa kumzali.
Ingabe ingane ingakwazi ukucubungula imfoloko?
Inqubo yengane iyinqubo edalwe inqubo yomzali kusistimu yokusebenza esebenzisa ikholi yesistimu ye-fork(). Inqubo yengane ingase futhi ibizwe ngokuthi i-subprocess noma umsebenzi ongaphansi. Inqubo yengane iyadalwa njengekhophi yenqubo yomzali wayo futhi izuza njengefa izici zayo eziningi.
Hlobo luni lwe-OS i-OS ye-multiprocessing?
I-Multiprocessing isho ikhono lesistimu yekhompyutha lokusekela inqubo (uhlelo) engaphezu kweyodwa ngesikhathi esisodwa. Amasistimu wokusebenza we-Multiprocessing anika amandla izinhlelo ezimbalwa ukuthi zisebenze kanyekanye. I-UNIX ingenye yezinhlelo ezisetshenziswa kakhulu zokucubungula izinto eziningi, kodwa ziningi ezinye, ezihlanganisa i-OS/2 yama-PC asezingeni eliphezulu.
Uyisebenzisa kanjani imfoloko?
Ukuze usike izinto epuletini lakho, bamba ummese ngesandla sakho sokudla kanye nemfoloko esandleni sakho sobunxele, imigqa ibheke phansi. Gobisa izihlakala zakho ukuze iminwe yakho yokukhomba ibheke phansi ibheke kupuleti lakho. Bese, ubambe ukudla phansi ngemfoloko ngokucindezela ngomunwe wokukhomba.