root/sapi/fpm/fpm/fpm_clock.c

DEFINITIONS

1. fpm_clock_init
2. fpm_clock_get
3. fpm_clock_init
4. fpm_clock_get
5. fpm_clock_init
6. fpm_clock_get

        /* $Id: fpm_clock.c,v 1.4 2008/09/18 23:19:59 anight Exp $ */
        /* (c) 2007,2008 Andrei Nigmatulin */

#include "fpm_config.h"

#if defined(HAVE_CLOCK_GETTIME)
#include <time.h> /* for CLOCK_MONOTONIC */
#endif

#include "fpm_clock.h"
#include "zlog.h"


/* posix monotonic clock - preferred source of time */
#if defined(HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC)

static int monotonic_works;

int fpm_clock_init() /* {{{ */
{
        struct timespec ts;

        monotonic_works = 0;

        if (0 == clock_gettime(CLOCK_MONOTONIC, &ts)) {
                monotonic_works = 1;
        }

        return 0;
}
/* }}} */

int fpm_clock_get(struct timeval *tv) /* {{{ */
{
        if (monotonic_works) {
                struct timespec ts;

                if (0 > clock_gettime(CLOCK_MONOTONIC, &ts)) {
                        zlog(ZLOG_SYSERROR, "clock_gettime() failed");
                        return -1;
                }

                tv->tv_sec = ts.tv_sec;
                tv->tv_usec = ts.tv_nsec / 1000;
                return 0;
        }

        return gettimeofday(tv, 0);
}
/* }}} */

/* macosx clock */
#elif defined(HAVE_CLOCK_GET_TIME)

#include <mach/mach.h>
#include <mach/clock.h>
#include <mach/mach_error.h>

static clock_serv_t mach_clock;

/* this code borrowed from here: http://lists.apple.com/archives/Darwin-development/2002/Mar/msg00746.html */
/* mach_clock also should be re-initialized in child process after fork */
int fpm_clock_init() /* {{{ */
{
        kern_return_t ret;
        mach_timespec_t aTime;

        ret = host_get_clock_service(mach_host_self(), REALTIME_CLOCK, &mach_clock);

        if (ret != KERN_SUCCESS) {
                zlog(ZLOG_ERROR, "host_get_clock_service() failed: %s", mach_error_string(ret));
                return -1;
        }

        /* test if it works */
        ret = clock_get_time(mach_clock, &aTime);

        if (ret != KERN_SUCCESS) {
                zlog(ZLOG_ERROR, "clock_get_time() failed: %s", mach_error_string(ret));
                return -1;
        }

        return 0;
}
/* }}} */

int fpm_clock_get(struct timeval *tv) /* {{{ */
{
        kern_return_t ret;
        mach_timespec_t aTime;

        ret = clock_get_time(mach_clock, &aTime);

        if (ret != KERN_SUCCESS) {
                zlog(ZLOG_ERROR, "clock_get_time() failed: %s", mach_error_string(ret));
                return -1;
        }

        tv->tv_sec = aTime.tv_sec;
        tv->tv_usec = aTime.tv_nsec / 1000;

        return 0;
}
/* }}} */

#else /* no clock */

int fpm_clock_init() /* {{{ */
{
        return 0;
}
/* }}} */

int fpm_clock_get(struct timeval *tv) /* {{{ */
{
        return gettimeofday(tv, 0);
}
/* }}} */

#endif