diff options
| -rw-r--r-- | proc.c | 41 |
1 files changed, 21 insertions, 20 deletions
@@ -54,6 +54,26 @@ setupsegs(struct proc *p) ltr(SEG_TSS << 3); } +// Grow current process's memory by n bytes. +// Return old size on success, -1 on failure. +int +growproc(int n) +{ + struct proc *cp = curproc[cpu()]; + char *newmem, *oldmem; + + newmem = kalloc(cp->sz + n); + if(newmem == 0) + return 0xffffffff; + memmove(newmem, cp->mem, cp->sz); + memset(newmem + cp->sz, 0, n); + oldmem = cp->mem; + cp->mem = newmem; + kfree(oldmem, cp->sz); + cp->sz += n; + return cp->sz - n; +} + // Look in the process table for an UNUSED proc. // If found, change state to EMBRYO and return it. // Otherwise return 0. @@ -136,26 +156,6 @@ copyproc(struct proc *p) return np; } -// Grow current process's memory by n bytes. -// Return old size on success, -1 on failure. -int -growproc(int n) -{ - struct proc *cp = curproc[cpu()]; - char *newmem, *oldmem; - - newmem = kalloc(cp->sz + n); - if(newmem == 0) - return 0xffffffff; - memmove(newmem, cp->mem, cp->sz); - memset(newmem + cp->sz, 0, n); - oldmem = cp->mem; - cp->mem = newmem; - kfree(oldmem, cp->sz); - cp->sz += n; - return cp->sz - n; -} - //PAGEBREAK: 42 // Per-CPU process scheduler. // Each CPU calls scheduler() after setting itself up. @@ -424,3 +424,4 @@ procdump(void) cprintf("%d %d %p\n", p->pid, p->state); } } + |