static void * alloc(u_int n, u_int align, int clear) { extern char end[]; int i; u_long alloced_mem; if(freemem==0) freemem=(u_long)end; freemem = (((u_long)(freemem))+(align)-1)&~((align)-1); //Step 1 finished. alloced_mem = freemem; //Step 2 finished. freemem +=(((u_long)(n))+(align)-1)&~((align)-1); //Step 3 finished. if(clear == 1){ for(i=alloced_mem;i<alloced_mem+n;i++) *i = 0; } //Step 4 finished. return (void *)alloced_mem; //Step 5 finished. }static void * alloc(u_int n, u_int align, int cle
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[操作系统实验lab2]实验报告
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