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/*
* Copyright (C) 2018 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 <gtest/gtest.h>
// membarrier(2) is only supported for bionic builds (b/111199492).
#if defined(__BIONIC__)
#include <linux/membarrier.h>
#include <sys/syscall.h>
class ScopedErrnoCleaner {
public:
ScopedErrnoCleaner() { errno = 0; }
~ScopedErrnoCleaner() { errno = 0; }
};
bool HasMembarrier() {
ScopedErrnoCleaner errno_cleaner;
bool present = syscall(__NR_membarrier, MEMBARRIER_CMD_QUERY, 0) > 0;
return present;
}
TEST(membarrier, query) {
ScopedErrnoCleaner errno_cleaner;
int supported = syscall(__NR_membarrier, MEMBARRIER_CMD_QUERY, 0);
if (errno == 0) {
ASSERT_TRUE(supported >= 0);
} else {
ASSERT_TRUE(errno == ENOSYS && supported == -1);
}
}
TEST(membarrier, global_barrier) {
if (!HasMembarrier()) {
return;
}
ScopedErrnoCleaner errno_cleaner;
int supported = syscall(__NR_membarrier, MEMBARRIER_CMD_QUERY, 0);
ASSERT_LE(0, supported);
if ((supported & MEMBARRIER_CMD_GLOBAL) != 0) {
ASSERT_EQ(0, syscall(__NR_membarrier, MEMBARRIER_CMD_GLOBAL, 0));
}
}
static void TestRegisterAndBarrierCommands(int membarrier_cmd_register,
int membarrier_cmd_barrier) {
if (!HasMembarrier()) {
return;
}
ScopedErrnoCleaner errno_cleaner;
// Check barrier use without prior registration.
if (membarrier_cmd_register == MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED) {
// Global barrier use is always okay.
ASSERT_EQ(0, syscall(__NR_membarrier, membarrier_cmd_barrier, 0));
} else {
// Private barrier should fail.
ASSERT_EQ(-1, syscall(__NR_membarrier, membarrier_cmd_barrier, 0));
ASSERT_EQ(EPERM, errno);
errno = 0;
}
// Check registration for barrier succeeds.
ASSERT_EQ(0, syscall(__NR_membarrier, membarrier_cmd_register, 0));
// Check barrier use after registration succeeds.
ASSERT_EQ(0, syscall(__NR_membarrier, membarrier_cmd_barrier, 0));
}
TEST(membarrier, global_expedited) {
TestRegisterAndBarrierCommands(MEMBARRIER_CMD_REGISTER_GLOBAL_EXPEDITED,
MEMBARRIER_CMD_GLOBAL_EXPEDITED);
}
TEST(membarrier, private_expedited) {
TestRegisterAndBarrierCommands(MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED,
MEMBARRIER_CMD_PRIVATE_EXPEDITED);
}
TEST(membarrier, private_expedited_sync_core) {
TestRegisterAndBarrierCommands(MEMBARRIER_CMD_REGISTER_PRIVATE_EXPEDITED_SYNC_CORE,
MEMBARRIER_CMD_PRIVATE_EXPEDITED_SYNC_CORE);
}
#endif // __BIONIC__
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