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Improve clock_gettime on osx

Browse source 
and some clean up
This commit is contained in:
Danila Malyutin 2015-08-19 00:27:41 +03:00 • committed by Nekotekina
parent 009370f73c
commit d0283265cc
3 changed files with 60 additions and 17 deletions
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52
Utilities/GNU.cpp
View file

@ -1,16 +1,52 @@
#include "GNU.h"
#ifdef __APPLE__
#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/_types/_timespec.h>
#include <mach/mach.h>
#include <mach/clock.h>
#include <mach/mach_time.h>
#undef CPU_STATE_MAX
int clock_gettime(int foo, struct timespec *ts) {
struct timeval tv;
#define MT_NANO (+1.0E-9)
#define MT_GIGA UINT64_C(1000000000)
gettimeofday(&tv, NULL);
ts->tv_sec = tv.tv_sec;
ts->tv_nsec = tv.tv_usec * 1000;
return(0);
// TODO create a list of timers,
static double mt_timebase = 0.0;
static uint64_t mt_timestart = 0;
// TODO be more careful in a multithreaded environement
int clock_gettime(clockid_t clk_id, struct timespec *tp)
{
kern_return_t retval = KERN_SUCCESS;
if( clk_id == TIMER_ABSTIME)
{
if (!mt_timestart) { // only one timer, initilized on the first call to the TIMER
mach_timebase_info_data_t tb = { 0 };
mach_timebase_info(&tb);
mt_timebase = tb.numer;
mt_timebase /= tb.denom;
mt_timestart = mach_absolute_time();
}
double diff = (mach_absolute_time() - mt_timestart) * mt_timebase;
tp->tv_sec = diff * MT_NANO;
tp->tv_nsec = diff - (tp->tv_sec * MT_GIGA);
}
else // other clk_ids are mapped to the coresponding mach clock_service
{
clock_serv_t cclock;
mach_timespec_t mts;
host_get_clock_service(mach_host_self(), clk_id, &cclock);
retval = clock_get_time(cclock, &mts);
mach_port_deallocate(mach_task_self(), cclock);
tp->tv_sec = mts.tv_sec;
tp->tv_nsec = mts.tv_nsec;
}
return retval;
}
#endif /* __APPLE__ */
#if defined(__GNUG__)

19
Utilities/GNU.h
View file

@ -68,12 +68,21 @@ inline int64_t __mulh(int64_t a, int64_t b)
#ifdef __APPLE__
int clock_gettime(int foo, struct timespec *ts);
#define wxIsNaN(x) ((x) != (x))
// XXX only supports a single timer
#define TIMER_ABSTIME -1
/* The opengroup spec isn't clear on the mapping from REALTIME to CALENDAR
being appropriate or not.
http://pubs.opengroup.org/onlinepubs/009695299/basedefs/time.h.html */
#define CLOCK_REALTIME 1 // #define CALENDAR_CLOCK 1 from mach/clock_types.h
#define CLOCK_MONOTONIC 0 // #define SYSTEM_CLOCK 0
#ifndef CLOCK_MONOTONIC
#define CLOCK_MONOTONIC 0
#endif /* !CLOCK_MONOTONIC */
typedef int clockid_t;
/* the mach kernel uses struct mach_timespec, so struct timespec
is loaded from <sys/_types/_timespec.h> for compatability */
// struct timespec { time_t tv_sec; long tv_nsec; };
int clock_gettime(clockid_t clk_id, struct timespec *tp);
#endif /* __APPLE__ */