1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #pragma once 30 31 #include <pthread.h> 32 33 #include "platform/bionic/macros.h" 34 35 template <bool write> class ScopedRWLock { 36 public: ScopedRWLock(pthread_rwlock_t * rwlock)37 explicit ScopedRWLock(pthread_rwlock_t* rwlock) : rwlock_(rwlock) { 38 (write ? pthread_rwlock_wrlock : pthread_rwlock_rdlock)(rwlock_); 39 } 40 ~ScopedRWLock()41 ~ScopedRWLock() { 42 pthread_rwlock_unlock(rwlock_); 43 } 44 45 private: 46 pthread_rwlock_t* rwlock_; 47 BIONIC_DISALLOW_IMPLICIT_CONSTRUCTORS(ScopedRWLock); 48 }; 49 50 typedef ScopedRWLock<true> ScopedWriteLock; 51 typedef ScopedRWLock<false> ScopedReadLock; 52