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7226d6efbe
Depends on D188032 Differential Revision: https://phabricator.services.mozilla.com/D188033
60 lines
1.6 KiB
C++
60 lines
1.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "mozilla/MemUtils.h"
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#if defined(XP_WIN)
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# include <windows.h>
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# include "mozilla/Maybe.h"
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#else
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# include <sys/mman.h>
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#endif
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#if defined(XP_WIN)
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typedef BOOL(WINAPI* PrefetchVirtualMemoryFn)(HANDLE, ULONG_PTR, PVOID, ULONG);
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static mozilla::Maybe<PrefetchVirtualMemoryFn> sPrefetchVirtualMemory;
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void MaybeInitPrefetchVirtualMemory() {
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if (sPrefetchVirtualMemory.isNothing()) {
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sPrefetchVirtualMemory.emplace(
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reinterpret_cast<PrefetchVirtualMemoryFn>(GetProcAddress(
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GetModuleHandleW(L"kernel32.dll"), "PrefetchVirtualMemory")));
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}
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}
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#endif
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bool mozilla::CanPrefetchMemory() {
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#if defined(XP_SOLARIS) || defined(XP_UNIX)
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return true;
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#elif defined(XP_WIN)
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MaybeInitPrefetchVirtualMemory();
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return *sPrefetchVirtualMemory;
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#else
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return false;
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#endif
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}
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void mozilla::PrefetchMemory(uint8_t* aStart, size_t aNumBytes) {
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if (aNumBytes == 0) {
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return;
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}
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#if defined(XP_SOLARIS)
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posix_madvise(aStart, aNumBytes, POSIX_MADV_WILLNEED);
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#elif defined(XP_UNIX)
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madvise(aStart, aNumBytes, MADV_WILLNEED);
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#elif defined(XP_WIN)
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MaybeInitPrefetchVirtualMemory();
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if (*sPrefetchVirtualMemory) {
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WIN32_MEMORY_RANGE_ENTRY entry;
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entry.VirtualAddress = aStart;
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entry.NumberOfBytes = aNumBytes;
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(*sPrefetchVirtualMemory)(GetCurrentProcess(), 1, &entry, 0);
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return;
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}
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#endif
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}
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