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117 lines
3.3 KiB
C++
117 lines
3.3 KiB
C++
/*
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* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* - Neither the name of Oracle nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef LIBJIMAGE_OSSUPPORT_HPP
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#define LIBJIMAGE_OSSUPPORT_HPP
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#ifdef WIN32
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#include <Windows.h>
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#else
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#include <pthread.h>
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#endif
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class osSupport {
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public:
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/**
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* Open a regular file read-only.
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* Return the file descriptor.
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*/
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static jint openReadOnly(const char *path);
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/**
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* Close a file descriptor.
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*/
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static jint close(jint fd);
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/**
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* Return the size of a regular file.
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*/
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static jlong size(const char *path);
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/**
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* Read nBytes at offset into a buffer.
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*/
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static jlong read(jint fd, char *buf, jlong nBytes, jlong offset);
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/**
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* Map nBytes at offset into memory and return the address.
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* The system chooses the address.
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*/
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static void* map_memory(jint fd, const char *filename, size_t file_offset, size_t bytes);
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/**
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* Unmap nBytes of memory at address.
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*/
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static int unmap_memory(void* addr, size_t bytes);
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};
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/**
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* A CriticalSection to protect a small section of code.
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*/
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class SimpleCriticalSection {
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friend class SimpleCriticalSectionLock;
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private:
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void enter();
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void exit();
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public:
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SimpleCriticalSection();
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//~SimpleCriticalSection(); // Cretes a dependency on Solaris on a C++ exit registration
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private:
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#ifdef WIN32
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CRITICAL_SECTION critical_section;
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#else
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pthread_mutex_t mutex;
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#endif // WIN32
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};
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/**
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* SimpleCriticalSectionLock instance.
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* The constructor locks a SimpleCriticalSection and the
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* destructor does the unlock.
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*/
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class SimpleCriticalSectionLock {
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private:
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SimpleCriticalSection *lock;
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public:
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SimpleCriticalSectionLock(SimpleCriticalSection *cslock) {
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this->lock = cslock;
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lock->enter();
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}
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~SimpleCriticalSectionLock() {
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lock->exit();
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}
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};
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#endif // LIBJIMAGE_OSSUPPORT_HPP
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