| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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. |
| */ |
| |
| #ifndef LIBHDFS_MUTEXES_H |
| #define LIBHDFS_MUTEXES_H |
| |
| /* |
| * Defines abstraction over platform-specific mutexes. libhdfs has no formal |
| * initialization function that users would call from a single-threaded context |
| * to initialize the library. This creates a challenge for bootstrapping the |
| * mutexes. To address this, all required mutexes are pre-defined here with |
| * external storage. Platform-specific implementations must guarantee that the |
| * mutexes are initialized via static initialization. |
| */ |
| |
| #include "platform.h" |
| |
| /** Mutex protecting the class reference hash table. */ |
| extern mutex hdfsHashMutex; |
| |
| /** Mutex protecting singleton JVM instance. */ |
| extern mutex jvmMutex; |
| |
| /** |
| * Locks a mutex. |
| * |
| * @param m mutex |
| * @return 0 if successful, non-zero otherwise |
| */ |
| int mutexLock(mutex *m); |
| |
| /** |
| * Unlocks a mutex. |
| * |
| * @param m mutex |
| * @return 0 if successful, non-zero otherwise |
| */ |
| int mutexUnlock(mutex *m); |
| |
| #endif |
