Ib txwm, malloc faib lub cim xeeb los ntawm lub heap, thiab kho qhov loj ntawm heap raws li xav tau, siv sbrk(2). Thaum faib cov blocks ntawm lub cim xeeb loj dua MMAP_THRESHOLD bytes, qhov kev siv glibc malloc faib lub cim xeeb raws li tus kheej tsis qhia npe siv mmap(2).
malloc nco faib nyob qhov twg?
Nyob rau hauv C, lub tsev qiv ntawv muaj nuj nqi malloc yog siv los faib ib lub cim xeeb ntawm the heap Qhov kev pab cuam nkag mus rau qhov thaiv ntawm lub cim xeeb ntawm tus taw tes uas malloc rov qab los. Thaum lub cim xeeb tsis xav tau lawm, tus pointer raug xa mus rau dawb uas deallocates lub cim xeeb kom nws siv tau rau lwm lub hom phiaj.
Nyob rau hauv qhov chaw ntawm lub cim xeeb Malloc thiab calloc faib lub cim xeeb?
Lub npe malloc thiab calloc yog lub tsev qiv ntawv ua haujlwm uas faib lub cim xeeb dynamically. Nws txhais tau hais tias lub cim xeeb tau faib thaum lub sijhawm ua haujlwm (kev ua tiav ntawm qhov program) los ntawm the heap ntu.
muab faib nyob qhov twg?
Lub Heap yog ib feem ntawm lub computer nco, faib rau ib daim ntawv thov khiav, qhov chaw nco tuaj yeem faib rau cov hloov pauv, chav kawm, thiab lwm yam
Nyob qhov twg statically faib lub cim xeeb khaws cia?
Thaum qhov kev pab cuam (executable lossis lub tsev qiv ntawv) raug thauj mus rau hauv lub cim xeeb, cov hloov pauv zoo li qub tau khaws cia hauv cov ntaub ntawv ntu ntawm qhov program qhov chaw nyob (yog tias pib), lossis ntu BSS (yog tias tsis tsim nyog), thiab muab khaws cia rau hauv cov ntu sib txuas ntawm cov khoom siv ua ntej thauj khoom.
