bionic/benchmarks/unistd_benchmark.cpp
Elliott Hughes 212e0e3824 Build our benchmarks against glibc too.
Bug: 18556607
Change-Id: I455ac8b93c0835836180e549486bc52d393ee6a6
2014-12-01 16:43:51 -08:00

72 lines
1.6 KiB
C++

/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "benchmark.h"
#include <sys/syscall.h>
#include <unistd.h>
static void BM_unistd_getpid(int iters) {
StartBenchmarkTiming();
for (int i = 0; i < iters; ++i) {
getpid();
}
StopBenchmarkTiming();
}
BENCHMARK(BM_unistd_getpid);
static void BM_unistd_getpid_syscall(int iters) {
StartBenchmarkTiming();
for (int i = 0; i < iters; ++i) {
syscall(__NR_getpid);
}
StopBenchmarkTiming();
}
BENCHMARK(BM_unistd_getpid_syscall);
#if defined(__BIONIC__)
// Stop GCC optimizing out our pure function.
/* Must not be static! */ pid_t (*gettid_fp)() = gettid;
static void BM_unistd_gettid(int iters) {
StartBenchmarkTiming();
for (int i = 0; i < iters; ++i) {
gettid_fp();
}
StopBenchmarkTiming();
}
BENCHMARK(BM_unistd_gettid);
#endif
static void BM_unistd_gettid_syscall(int iters) {
StartBenchmarkTiming();
for (int i = 0; i < iters; ++i) {
syscall(__NR_gettid);
}
StopBenchmarkTiming();
}
BENCHMARK(BM_unistd_gettid_syscall);