mirror of https://github.com/facebook/rocksdb.git
142 lines
3.4 KiB
C++
142 lines
3.4 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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//
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#include "rocksdb/status.h"
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#include "rocksdb/env.h"
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#include <vector>
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#include <fcntl.h>
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#include "util/coding.h"
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#include "util/testharness.h"
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namespace rocksdb {
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class LockTest : public testing::Test {
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public:
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static LockTest* current_;
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std::string file_;
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rocksdb::Env* env_;
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LockTest()
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: file_(test::PerThreadDBPath("db_testlock_file")),
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env_(rocksdb::Env::Default()) {
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current_ = this;
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}
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~LockTest() override {}
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Status LockFile(FileLock** db_lock) {
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return env_->LockFile(file_, db_lock);
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}
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Status UnlockFile(FileLock* db_lock) {
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return env_->UnlockFile(db_lock);
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}
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bool AssertFileIsLocked(){
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return CheckFileLock( /* lock_expected = */ true);
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}
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bool AssertFileIsNotLocked(){
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return CheckFileLock( /* lock_expected = */ false);
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}
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bool CheckFileLock(bool lock_expected){
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// We need to fork to check the fcntl lock as we need
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// to open and close the file from a different process
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// to avoid either releasing the lock on close, or not
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// contending for it when requesting a lock.
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#ifdef OS_WIN
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// WaitForSingleObject and GetExitCodeProcess can do what waitpid does.
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// TODO - implement on Windows
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return true;
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#else
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pid_t pid = fork();
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if ( 0 == pid ) {
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// child process
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int exit_val = EXIT_FAILURE;
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int fd = open(file_.c_str(), O_RDWR | O_CREAT, 0644);
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if (fd < 0) {
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// could not open file, could not check if it was locked
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fprintf( stderr, "Open on on file %s failed.\n",file_.c_str());
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exit(exit_val);
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}
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struct flock f;
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memset(&f, 0, sizeof(f));
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f.l_type = (F_WRLCK);
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f.l_whence = SEEK_SET;
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f.l_start = 0;
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f.l_len = 0; // Lock/unlock entire file
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int value = fcntl(fd, F_SETLK, &f);
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if( value == -1 ){
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if( lock_expected ){
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exit_val = EXIT_SUCCESS;
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}
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} else {
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if( ! lock_expected ){
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exit_val = EXIT_SUCCESS;
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}
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}
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close(fd); // lock is released for child process
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exit(exit_val);
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} else if (pid > 0) {
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// parent process
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int status;
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while (-1 == waitpid(pid, &status, 0));
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
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// child process exited with non success status
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return false;
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} else {
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return true;
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}
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} else {
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fprintf( stderr, "Fork failed\n" );
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return false;
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}
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return false;
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#endif
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}
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};
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LockTest* LockTest::current_;
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TEST_F(LockTest, LockBySameThread) {
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FileLock* lock1;
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FileLock* lock2;
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// acquire a lock on a file
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ASSERT_OK(LockFile(&lock1));
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// check the file is locked
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ASSERT_TRUE( AssertFileIsLocked() );
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// re-acquire the lock on the same file. This should fail.
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ASSERT_TRUE(LockFile(&lock2).IsIOError());
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// check the file is locked
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ASSERT_TRUE( AssertFileIsLocked() );
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// release the lock
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ASSERT_OK(UnlockFile(lock1));
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// check the file is not locked
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ASSERT_TRUE( AssertFileIsNotLocked() );
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}
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} // namespace rocksdb
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int main(int argc, char** argv) {
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::testing::InitGoogleTest(&argc, argv);
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return RUN_ALL_TESTS();
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}
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