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/*
* 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 <errno.h>
#include <string.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <string>
#include <android-base/stringprintf.h>
#include <benchmark/benchmark.h>
#include "util.h"
BIONIC_TRIVIAL_BENCHMARK(BM_unistd_getpid, getpid());
BIONIC_TRIVIAL_BENCHMARK(BM_unistd_getpid_syscall, syscall(__NR_getpid));
// TODO: glibc 2.30 added gettid() too.
#if defined(__BIONIC__)
BIONIC_TRIVIAL_BENCHMARK(BM_unistd_gettid, gettid());
#endif
BIONIC_TRIVIAL_BENCHMARK(BM_unistd_gettid_syscall, syscall(__NR_gettid));
// Many native allocators have custom prefork and postfork functions.
// Measure the fork call to make sure nothing takes too long.
void BM_unistd_fork_call(benchmark::State& state) {
for (auto _ : state) {
pid_t pid;
if ((pid = fork()) == 0) {
// Sleep for a little while so that the parent is not interrupted
// right away when the process exits.
usleep(100);
_exit(1);
}
state.PauseTiming();
if (pid == -1) {
std::string err = android::base::StringPrintf("Fork failed: %s", strerror(errno));
state.SkipWithError(err.c_str());
}
pid_t wait_pid = waitpid(pid, 0, 0);
if (wait_pid != pid) {
if (wait_pid == -1) {
std::string err = android::base::StringPrintf("waitpid call failed: %s", strerror(errno));
state.SkipWithError(err.c_str());
} else {
std::string err = android::base::StringPrintf(
"waitpid return an unknown pid, expected %d, actual %d", pid, wait_pid);
state.SkipWithError(err.c_str());
}
}
state.ResumeTiming();
}
}
BIONIC_BENCHMARK(BM_unistd_fork_call);
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