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Merge "Fix the way to count online cpus."

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This commit is contained in:
Yabin Cui
2015-09-30 01:17:32 +00:00
committed by Gerrit Code Review
parent 8b279eadd3 cb6f599c44
commit c1eebd5ff4
3 changed files with 92 additions and 18 deletions
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28
tests/unistd_test.cpp
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@@ -30,6 +30,11 @@
#include <sys/wait.h>
#include <unistd.h>
#include <base/file.h>
#include <base/strings.h>
#include "private/get_cpu_count_from_string.h"
static void* get_brk() {
return sbrk(0);
}
@@ -819,6 +824,29 @@ TEST(unistd, sysconf) {
#endif // defined(__BIONIC__)
}
TEST(unistd, get_cpu_count_from_string) {
ASSERT_EQ(0, GetCpuCountFromString(" "));
ASSERT_EQ(1, GetCpuCountFromString("0"));
ASSERT_EQ(40, GetCpuCountFromString("0-39"));
ASSERT_EQ(4, GetCpuCountFromString("0, 1-2, 4\n"));
}
TEST(unistd, sysconf_SC_NPROCESSORS_ONLN) {
std::string s;
ASSERT_TRUE(android::base::ReadFileToString("/sys/devices/system/cpu/online", &s));
std::vector<std::string> strs = android::base::Split(s, ",");
long online_cpus = 0;
for (auto& s : strs) {
std::vector<std::string> numbers = android::base::Split(s, "-");
if (numbers.size() == 1u) {
online_cpus++;
} else {
online_cpus += atoi(numbers[1].c_str()) - atoi(numbers[0].c_str()) + 1;
}
}
ASSERT_EQ(online_cpus, sysconf(_SC_NPROCESSORS_ONLN));
}
TEST(unistd, dup2_same) {
// POSIX says of dup2:
// If fildes2 is already a valid open file descriptor ...