110 lines
3.1 KiB
C++
110 lines
3.1 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "util.h"
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#include <err.h>
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#include <math.h>
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#include <sched.h>
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#include <stdio.h>
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#include <string.h>
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#include <wchar.h>
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#include <cstdlib>
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// This function returns a pointer less than 2 * alignment + or_mask bytes into the array.
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char* GetAlignedMemory(char* orig_ptr, size_t alignment, size_t or_mask) {
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if ((alignment & (alignment - 1)) != 0) {
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errx(1, "warning: alignment passed into GetAlignedMemory is not a power of two.");
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}
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if (or_mask > alignment) {
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errx(1, "warning: or_mask passed into GetAlignedMemory is too high.");
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}
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uintptr_t ptr = reinterpret_cast<uintptr_t>(orig_ptr);
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if (alignment > 0) {
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// When setting the alignment, set it to exactly the alignment chosen.
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// The pointer returned will be guaranteed not to be aligned to anything
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// more than that.
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ptr += alignment - (ptr & (alignment - 1));
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ptr |= alignment | or_mask;
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}
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return reinterpret_cast<char*>(ptr);
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}
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char* GetAlignedPtr(std::vector<char>* buf, size_t alignment, size_t nbytes) {
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buf->resize(nbytes + 3 * alignment);
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return GetAlignedMemory(buf->data(), alignment, 0);
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}
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wchar_t* GetAlignedPtr(std::vector<wchar_t>* buf, size_t alignment, size_t nchars) {
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buf->resize(nchars + ceil((3 * alignment) / sizeof(wchar_t)));
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return reinterpret_cast<wchar_t*>(GetAlignedMemory(reinterpret_cast<char*>(buf->data()),
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alignment, 0));
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}
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char* GetAlignedPtrFilled(std::vector<char>* buf, size_t alignment, size_t nbytes, char fill_byte) {
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char* buf_aligned = GetAlignedPtr(buf, alignment, nbytes);
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memset(buf_aligned, fill_byte, nbytes);
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return buf_aligned;
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}
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#if defined(__APPLE__)
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// Darwin doesn't support this, so do nothing.
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bool LockToCPU(int) {
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return false;
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}
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#else
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bool LockToCPU(long cpu_to_lock) {
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cpu_set_t cpuset;
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CPU_ZERO(&cpuset);
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if (sched_getaffinity(0, sizeof(cpuset), &cpuset) != 0) {
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perror("sched_getaffinity failed");
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return false;
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}
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if (cpu_to_lock < 0) {
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// Lock to the last active core we find.
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for (int i = 0; i < CPU_SETSIZE; i++) {
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if (CPU_ISSET(i, &cpuset)) {
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cpu_to_lock = i;
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}
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}
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} else if (!CPU_ISSET(cpu_to_lock, &cpuset)) {
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printf("Cpu %ld does not exist.\n", cpu_to_lock);
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return false;
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}
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if (cpu_to_lock < 0) {
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printf("Cannot find any valid cpu to lock.\n");
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return false;
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}
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CPU_ZERO(&cpuset);
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CPU_SET(cpu_to_lock, &cpuset);
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if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0) {
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perror("sched_setaffinity failed");
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return false;
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}
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return true;
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}
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#endif
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