1 #include "kernel/system.h" 2 #include <minix/endpoint.h> 3 4 /*===========================================================================* 5 * do_schedctl * 6 *===========================================================================*/ 7 int do_schedctl(struct proc * caller, message * m_ptr) 8 { 9 struct proc *p; 10 uint32_t flags; 11 int priority, quantum, cpu; 12 int proc_nr; 13 int r; 14 15 /* check parameter validity */ 16 flags = m_ptr->m_lsys_krn_schedctl.flags; 17 if (flags & ~SCHEDCTL_FLAG_KERNEL) { 18 printf("do_schedctl: flags 0x%x invalid, caller=%d\n", 19 flags, caller - proc); 20 return EINVAL; 21 } 22 23 if (!isokendpt(m_ptr->m_lsys_krn_schedctl.endpoint, &proc_nr)) 24 return EINVAL; 25 26 p = proc_addr(proc_nr); 27 28 if ((flags & SCHEDCTL_FLAG_KERNEL) == SCHEDCTL_FLAG_KERNEL) { 29 /* the kernel becomes the scheduler and starts 30 * scheduling the process. 31 */ 32 priority = m_ptr->m_lsys_krn_schedctl.priority; 33 quantum = m_ptr->m_lsys_krn_schedctl.quantum; 34 cpu = m_ptr->m_lsys_krn_schedctl.cpu; 35 36 /* Try to schedule the process. */ 37 if((r = sched_proc(p, priority, quantum, cpu, FALSE)) != OK) 38 return r; 39 p->p_scheduler = NULL; 40 } else { 41 /* the caller becomes the scheduler */ 42 p->p_scheduler = caller; 43 } 44 45 return(OK); 46 } 47