dmcallis
65a0592776
Source code drop for the Actionscript virtual machine in the Adobe Flash Player for December 2013
54 lines
1.6 KiB
C++
54 lines
1.6 KiB
C++
/* -*- Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 4 -*- */
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/* vi: set ts=4 sw=4 expandtab: (add to ~/.vimrc: set modeline modelines=5) */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "VMPI.h"
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#include <mach/mach.h>
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#include <mach/mach_time.h>
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// Call VMPI_getPerformanceFrequency() once to initialize its cache; avoids thread safety issues.
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static uint64_t unused_value = VMPI_getPerformanceFrequency();
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uint64_t VMPI_getPerformanceFrequency()
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{
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// *** NOTE ABOUT THREAD SAFETY ***
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//
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// These statics ought to be safe because they are initialized by a call at startup
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// (see lines above this function), before any AvmCores are created.
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static mach_timebase_info_data_t info;
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static uint64_t frequency = 0;
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if ( frequency == 0 ) {
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(void) mach_timebase_info(&info);
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frequency = (uint64_t) ( 1e9 / ((double) info.numer / (double) info.denom) );
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}
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return frequency;
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}
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uint64_t VMPI_getPerformanceCounter()
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{
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return mach_absolute_time();
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}
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static size_t computePagesize()
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{
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long pagesize = sysconf(_SC_PAGESIZE);
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// MacOS X 10.1 needs the extra check
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if (pagesize == -1)
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pagesize = 4096;
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return size_t(pagesize);
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}
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// Private to VMPI_getVMPageSize; DO NOT REFERENCE THIS VARIABLE ELSEWHERE.
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// Always call VMPI_getVMPageSize, even inside this file.
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static size_t pagesize = computePagesize();
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size_t VMPI_getVMPageSize()
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{
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return pagesize;
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}
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