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#include <panic.h>
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#include <panic.h>
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#include <typedefs.h>
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#include <typedefs.h>
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#include <mm/page.h>
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#include <mm/page.h>
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#include <synch/spinlock.h>
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#include <synch/spinlock.h>
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#include <arch/faddr.h>
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#include <arch/faddr.h>
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#ifdef __SMP__
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#include <arch/smp/atomic.h>
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#include <arch/atomic.h>
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#endif /* __SMP__ */
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/*
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/*
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 * NOTE ON ATOMIC READS:
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 * NOTE ON ATOMIC READS:
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 * Some architectures cannot read __u32 atomically.
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 * Some architectures cannot read __u32 atomically.
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 * For that reason, all accesses to nrdy and the likes must be protected by spinlock.
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 * For that reason, all accesses to nrdy and the likes must be protected by spinlock.
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 */
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 */
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spinlock_t nrdylock;
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volatile int nrdy;
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volatile int nrdy;
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/** Initialize context switching
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/** Initialize context switching
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 *
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 *
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 * Initialize kernel scheduler.
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 * Initialize kernel scheduler.
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 *
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 *
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 */
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 */
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void scheduler_init(void)
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void scheduler_init(void)
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{
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{
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    spinlock_initialize(&nrdylock);
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}
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}
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/** Get thread to be scheduled
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/** Get thread to be scheduled
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 *
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 *
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             */
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             */
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            spinlock_unlock(&r->lock);
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            spinlock_unlock(&r->lock);
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            continue;
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            continue;
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        }
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        }
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        spinlock_lock(&nrdylock);
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        atomic_dec(&nrdy);
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        nrdy--;
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        spinlock_unlock(&nrdylock);    
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        spinlock_lock(&CPU->lock);
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        spinlock_lock(&CPU->lock);
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        CPU->nrdy--;
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        CPU->nrdy--;
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        spinlock_unlock(&CPU->lock);
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        spinlock_unlock(&CPU->lock);
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                        goto restart;
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                        goto restart;
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                    }
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                    }
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                    cpu->nrdy--;
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                    cpu->nrdy--;
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                    spinlock_unlock(&cpu->lock);
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                    spinlock_unlock(&cpu->lock);
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                    spinlock_lock(&nrdylock);
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                    atomic_dec(&nrdy);
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                    nrdy--;
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                    spinlock_unlock(&nrdylock);                
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                        r->n--;
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                        r->n--;
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                    list_remove(&t->rq_link);
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                    list_remove(&t->rq_link);
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                    break;
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                    break;