timer.h

Go to the documentation of this file.

/*
 *  linux/include/linux/sunrpc/timer.h
 *
 *  Declarations for the RPC transport timer.
 *
 *  Copyright (C) 2002 Trond Myklebust <[email protected]>
 */

#ifndef _LINUX_SUNRPC_TIMER_H
#define _LINUX_SUNRPC_TIMER_H

#include <linux/atomic.h>

struct rpc_rtt {
    unsigned long timeo;    /* default timeout value */
    unsigned long srtt[5];  /* smoothed round trip time << 3 */
    unsigned long sdrtt[5]; /* smoothed medium deviation of RTT */
    int ntimeouts[5];   /* Number of timeouts for the last request */
};


extern void rpc_init_rtt(struct rpc_rtt *rt, unsigned long timeo);
extern void rpc_update_rtt(struct rpc_rtt *rt, unsigned timer, long m);
extern unsigned long rpc_calc_rto(struct rpc_rtt *rt, unsigned timer);

static inline void rpc_set_timeo(struct rpc_rtt *rt, int timer, int ntimeo)
{
    int *t;
    if (!timer)
        return;
    t = &rt->ntimeouts[timer-1];
    if (ntimeo < *t) {
        if (*t > 0)
            (*t)--;
    } else {
        if (ntimeo > 8)
            ntimeo = 8;
        *t = ntimeo;
    }
}

static inline int rpc_ntimeo(struct rpc_rtt *rt, int timer)
{
    if (!timer)
        return 0;
    return rt->ntimeouts[timer-1];
}

#endif /* _LINUX_SUNRPC_TIMER_H */