osdMonotonic.c File Reference

#include <vxWorks.h>
#include <stdio.h>
#include <sysLib.h>
#include <taskLib.h>
#include "epicsTypes.h"
#include "epicsTime.h"
#include "cantProceed.h"
#include <arch/ppc/vxPpcLib.h>
#include "epicsFindSymbol.h"

Include dependency graph for osdMonotonic.c:

Go to the source code of this file.

Classes
union	timebase

Macros
#define	_VSB_CONFIG_FILE   <../lib/h/config/vsbConfig.h>
#define	EPICS_EXPOSE_LIBCOM_MONOTONIC_PRIVATE
#define	NS_PER_SEC   1000000000
#define	TIMEBASEGET(TB)   vxTimeBaseGet(&TB.u32[0], &TB.u32[1])

Functions
void	osdMonotonicInit (void)
epicsUInt64	epicsMonotonicResolution (void)
	Monotonic time resolution, may not be accurate. Returns the minimum non-zero time difference between two calls to epicsMonotonicGet() in units of nanoseconds. More...
epicsUInt64	epicsMonotonicGet (void)
	Fetch monotonic counter, returns the number of nanoseconds since some unspecified time. More...

Macro Definition Documentation

#define _VSB_CONFIG_FILE   <../lib/h/config/vsbConfig.h>

Definition at line 8 of file osdMonotonic.c.

#define EPICS_EXPOSE_LIBCOM_MONOTONIC_PRIVATE

Definition at line 15 of file osdMonotonic.c.

#define NS_PER_SEC   1000000000

Definition at line 21 of file osdMonotonic.c.

#define TIMEBASEGET

(

TB

)

vxTimeBaseGet(&TB.u32[0], &TB.u32[1])

Definition at line 41 of file osdMonotonic.c.

Function Documentation

epicsUInt64 epicsMonotonicGet

(

void

)

Fetch monotonic counter, returns the number of nanoseconds since some unspecified time.

Definition at line 107 of file osdMonotonic.c.

{
    union timebase tbNow;

    if (!ticksPerSec) {
        cantProceed("Monotonic time source not available.\n");
    }

    TIMEBASEGET(tbNow);
    /* Using a long double for the calculation below to preserve
     * as many bits in the mantissa as possible.
     */
    return ((long double) tbNow.u64) * NS_PER_SEC / ticksPerSec;
}

epicsUInt64 epicsMonotonicResolution

(

void

)

Monotonic time resolution, may not be accurate. Returns the minimum non-zero time difference between two calls to epicsMonotonicGet() in units of nanoseconds.

Definition at line 99 of file osdMonotonic.c.

{
    if (!ticksPerSec)
        return 0;

    return NS_PER_SEC / ticksPerSec;
}

void osdMonotonicInit

(

void

)

Definition at line 44 of file osdMonotonic.c.

{
    typedef epicsUInt32 (*sysTimeBaseFreq_t)(void);
    sysTimeBaseFreq_t sysTimeBaseFreq =
        (sysTimeBaseFreq_t) epicsFindSymbol("_sysTimeBaseFreq");

    if (sysTimeBaseFreq) {
        ticksPerSec = sysTimeBaseFreq();

        if (ticksPerSec)
            return;

        /* This should never happen */
        printf("Warning: sysTimeBaseFreq() present but returned zero.\n");
    }

    /* Fall back to measuring */
    measureTickRate();
}