1/* 2 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * - Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 11 * - Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * - Neither the name of Oracle nor the names of its 16 * contributors may be used to endorse or promote products derived 17 * from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#ifndef LIBJIMAGE_OSSUPPORT_HPP 33#define LIBJIMAGE_OSSUPPORT_HPP 34 35#ifdef WIN32 36#include <Windows.h> 37#else 38#include <pthread.h> 39#endif 40 41class osSupport { 42public: 43 /** 44 * Open a regular file read-only. 45 * Return the file descriptor. 46 */ 47 static jint openReadOnly(const char *path); 48 49 /** 50 * Close a file descriptor. 51 */ 52 static jint close(jint fd); 53 54 /** 55 * Return the size of a regular file. 56 */ 57 static jlong size(const char *path); 58 59 /** 60 * Read nBytes at offset into a buffer. 61 */ 62 static jlong read(jint fd, char *buf, jlong nBytes, jlong offset); 63 64 /** 65 * Map nBytes at offset into memory and return the address. 66 * The system chooses the address. 67 */ 68 static void* map_memory(jint fd, const char *filename, size_t file_offset, size_t bytes); 69 70 /** 71 * Unmap nBytes of memory at address. 72 */ 73 static int unmap_memory(void* addr, size_t bytes); 74}; 75 76/** 77 * A CriticalSection to protect a small section of code. 78 */ 79class SimpleCriticalSection { 80 friend class SimpleCriticalSectionLock; 81private: 82 void enter(); 83 void exit(); 84public: 85 SimpleCriticalSection(); 86 //~SimpleCriticalSection(); // Cretes a dependency on Solaris on a C++ exit registration 87 88private: 89#ifdef WIN32 90 CRITICAL_SECTION critical_section; 91#else 92 pthread_mutex_t mutex; 93#endif // WIN32 94}; 95 96/** 97 * SimpleCriticalSectionLock instance. 98 * The constructor locks a SimpleCriticalSection and the 99 * destructor does the unlock. 100 */ 101class SimpleCriticalSectionLock { 102private: 103 SimpleCriticalSection *lock; 104public: 105 106 SimpleCriticalSectionLock(SimpleCriticalSection *cslock) { 107 this->lock = cslock; 108 lock->enter(); 109 } 110 111 ~SimpleCriticalSectionLock() { 112 lock->exit(); 113 } 114}; 115 116#endif // LIBJIMAGE_OSSUPPORT_HPP 117