77 строки
2.4 KiB
C
77 строки
2.4 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2014 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#ifndef OPAL_MCA_TIMER_DARWIN_TIMER_DARWIN_H
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#define OPAL_MCA_TIMER_DARWIN_TIMER_DARWIN_H
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#include "opal_config.h"
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#include <mach/mach_time.h>
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typedef uint64_t opal_timer_t;
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/* frequency in mhz */
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OPAL_DECLSPEC extern opal_timer_t opal_timer_darwin_freq;
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OPAL_DECLSPEC extern mach_timebase_info_data_t opal_timer_darwin_info;
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OPAL_DECLSPEC extern opal_timer_t opal_timer_darwin_bias;
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/**
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* Use the pragmatic solution proposed at
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* http://stackoverflow.com/questions/23378063/how-can-i-use-mach-absolute-time-without-overflowing/23378064#23378064
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*/
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static inline opal_timer_t
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opal_timer_base_get_cycles(void)
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{
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uint64_t now = mach_absolute_time();
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if( opal_timer_darwin_info.denom == 0 ) {
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(void)mach_timebase_info(&opal_timer_darwin_info);
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if( opal_timer_darwin_info.denom > 1024 ) {
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double frac = (double)opal_timer_darwin_info.numer/opal_timer_darwin_info.denom;
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opal_timer_darwin_info.denom = 1024;
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opal_timer_darwin_info.numer = opal_timer_darwin_info.denom * frac + 0.5;
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}
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opal_timer_darwin_bias = now;
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}
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/* this is basically a wrapper around the "right" assembly to convert
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the tick counter off the PowerPC Time Base into nanos. */
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return (now - opal_timer_darwin_bias) * opal_timer_darwin_info.numer / opal_timer_darwin_info.denom;
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}
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static inline opal_timer_t
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opal_timer_base_get_usec(void)
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{
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/* freq is in Hz, so this gives usec */
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return opal_timer_base_get_cycles() / 1000;
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}
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static inline opal_timer_t
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opal_timer_base_get_freq(void)
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{
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return opal_timer_darwin_freq;
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}
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#define OPAL_TIMER_CYCLE_NATIVE 0
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#define OPAL_TIMER_CYCLE_SUPPORTED 1
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#define OPAL_TIMER_USEC_NATIVE 1
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#define OPAL_TIMER_USEC_SUPPORTED 1
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#endif
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