《操作系统》的实验代码。
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#ifndef __KERN_SCHEDULE_SCHED_H__
#define __KERN_SCHEDULE_SCHED_H__
#include <defs.h>
#include <list.h>
#include <skew_heap.h>
#define MAX_TIME_SLICE 5
struct proc_struct;
typedef struct {
unsigned int expires; //the expire time
struct proc_struct *proc; //the proc wait in this timer. If the expire time is end, then this proc will be scheduled
list_entry_t timer_link; //the timer list
} timer_t;
#define le2timer(le, member) \
to_struct((le), timer_t, member)
// init a timer
static inline timer_t *
timer_init(timer_t *timer, struct proc_struct *proc, int expires) {
timer->expires = expires;
timer->proc = proc;
list_init(&(timer->timer_link));
return timer;
}
struct run_queue;
// The introduction of scheduling classes is borrrowed from Linux, and makes the
// core scheduler quite extensible. These classes (the scheduler modules) encapsulate
// the scheduling policies.
struct sched_class {
// the name of sched_class
const char *name;
// Init the run queue
void (*init)(struct run_queue *rq);
// put the proc into runqueue, and this function must be called with rq_lock
void (*enqueue)(struct run_queue *rq, struct proc_struct *proc);
// get the proc out runqueue, and this function must be called with rq_lock
void (*dequeue)(struct run_queue *rq, struct proc_struct *proc);
// choose the next runnable task
struct proc_struct *(*pick_next)(struct run_queue *rq);
// dealer of the time-tick
void (*proc_tick)(struct run_queue *rq, struct proc_struct *proc);
/* for SMP support in the future
* load_balance
* void (*load_balance)(struct rq* rq);
* get some proc from this rq, used in load_balance,
* return value is the num of gotten proc
* int (*get_proc)(struct rq* rq, struct proc* procs_moved[]);
*/
};
struct run_queue {
list_entry_t run_list;
unsigned int proc_num;
int max_time_slice;
// For LAB6 ONLY
skew_heap_entry_t *lab6_run_pool;
};
void sched_init(void);
void wakeup_proc(struct proc_struct *proc);
void schedule(void);
void add_timer(timer_t *timer); // add timer to timer_list
void del_timer(timer_t *timer); // del timer from timer_list
void run_timer_list(void); // call scheduler to update tick related info, and check the timer is expired? If expired, then wakup proc
#endif /* !__KERN_SCHEDULE_SCHED_H__ */