// Set up first user process.
void
userinit(void)
{
struct proc *p;
extern uchar _binary_initcode_start[], _binary_initcode_size[];
p = copyproc(0);
p->sz = PAGE;
p->mem = kalloc(p->sz);
p->cwd = namei("/");
memset(p->tf, 0, sizeof(*p->tf));
p->tf->cs = (SEG_UCODE << 3) | DPL_USER;
p->tf->ds = (SEG_UDATA << 3) | DPL_USER;
p->tf->es = p->tf->ds;
p->tf->ss = p->tf->ds;
p->tf->eflags = FL_IF;
p->tf->esp = p->sz;
// Make return address readable; needed for some gcc.
p->tf->esp -= 4;
*(uint*)(p->mem + p->tf->esp) = 0xefefefef;
// On entry to user space, start executing at beginning of initcode.S.
p->tf->eip = 0;
memmove(p->mem, _binary_initcode_start, (int)_binary_initcode_size);
safestrcpy(p->name, "initcode", sizeof(p->name));
#ifdef LOTTERY
p->tickets = INIT_TICKETS;
#endif
p->state = UNUSED;
setstate(p, RUNNABLE);
initproc = p;
}
int
sys_fork(void)
{
int pid;
struct proc *np;
if((np = copyproc(cp)) == 0)
return -1;
pid = np->pid;
np->state = RUNNABLE;
return pid;
}
int
sys_fork(void)
{
int pid;
struct proc *np;
if((np = copyproc(cp)) == 0)
return -1;
pid = np->pid;
#ifdef LOTTERY
np->tickets = NEW_PROC_TICKETS;
#endif
setstate(np, RUNNABLE);
return pid;
}
int
sys_fork(void)
{
int pid;
struct proc *np;
if((np = copyproc(cp)) == 0){
cprintf("sysfork failed here\n");
return -1;
}
acquire(&(cpus[cpu()].rq->rq_lock));
pid = np->pid;
np->state = RUNNABLE;
enqueue_proc(cpus[cpu()].rq, np);
release(&(cpus[cpu()].rq->rq_lock));
return pid;
}
