cb6f599c44
Read /proc/stat to count online cpus is not correct for all android kernels. Change to reading /sys/devices/system/cpu/online instead. Bug: 24376925 Change-Id: I3785a6c7aa15a467022a9a261b457194d688fb38
54 lines
1.9 KiB
C
54 lines
1.9 KiB
C
/*
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* Copyright (C) 2015 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <ctype.h>
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#include <stdlib.h>
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// Parse a string like: 0, 2-4, 6.
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static int GetCpuCountFromString(const char* s) {
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int cpu_count = 0;
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int last_cpu = -1;
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while (*s != '\0') {
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if (isdigit(*s)) {
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int cpu = static_cast<int>(strtol(s, const_cast<char**>(&s), 10));
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if (last_cpu != -1) {
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cpu_count += cpu - last_cpu;
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} else {
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cpu_count++;
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}
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last_cpu = cpu;
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} else {
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if (*s == ',') {
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last_cpu = -1;
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}
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s++;
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}
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}
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return cpu_count;
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}
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