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products/Sources/formale Sprachen/JAVA/Openjdk/src/java.base/share/native/libjimage/ (Sun/Oracle ^©) Datei vom 13.11.2022 mit Größe 3 kB

Quellverzeichnis osSupport.hpp Sprache: C

/*
* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
*   - Redistributions of source code must retain the above copyright
*     notice, this list of conditions and the following disclaimer.
*
*   - Redistributions in binary form must reproduce the above copyright
*     notice, this list of conditions and the following disclaimer in the
*     documentation and/or other materials provided with the distribution.
*
*   - Neither the name of Oracle nor the names of its
*     contributors may be used to endorse or promote products derived
*     from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef LIBJIMAGE_OSSUPPORT_HPP
#define LIBJIMAGE_OSSUPPORT_HPP

#ifdef WIN32
#include <Windows.h>
#else
#include <pthread.h>
#endif

class osSupport {
public:
    /**
     * Open a regular file read-only.
     * Return the file descriptor.
     */
    static jint openReadOnly(const char *path);

    /**
     * Close a file descriptor.
     */
    static jint close(jint fd);

    /**
     * Return the size of a regular file.
     */
    static jlong size(const char *path);

    /**
     * Read nBytes at offset into a buffer.
     */
    static jlong read(jint fd, char *buf, jlong nBytes, jlong offset);

    /**
     * Map nBytes at offset into memory and return the address.
     * The system chooses the address.
     */
    static void* map_memory(jint fd, const char *filename, size_t file_offset, size_t bytes);

    /**
     * Unmap nBytes of memory at address.
     */
    static int unmap_memory(void* addr, size_t bytes);
};

/**
* A CriticalSection to protect a small section of code.
*/
class SimpleCriticalSection {
    friend class SimpleCriticalSectionLock;
private:
    void enter();
    void exit();
public:
    SimpleCriticalSection();
    //~SimpleCriticalSection(); // Cretes a dependency on Solaris on a C++ exit registration

private:
#ifdef WIN32
    CRITICAL_SECTION critical_section;
#else
    pthread_mutex_t mutex;
#endif // WIN32
};

/**
* SimpleCriticalSectionLock instance.
* The constructor locks a SimpleCriticalSection and the
* destructor does the unlock.
*/
class SimpleCriticalSectionLock {
private:
    SimpleCriticalSection *lock;
public:

    SimpleCriticalSectionLock(SimpleCriticalSection *cslock) {
        this->lock = cslock;
        lock->enter();
    }

    ~SimpleCriticalSectionLock() {
        lock->exit();
    }
};

#endif  // LIBJIMAGE_OSSUPPORT_HPP

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