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 

    41 class osSupport {

    42 public:

    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  */

    79 class SimpleCriticalSection {

    80     friend class SimpleCriticalSectionLock;

    81 private:

    82     void enter();

    83     void exit();

    84 public:

    85     SimpleCriticalSection();

    86     //~SimpleCriticalSection(); // Cretes a dependency on Solaris on a C++ exit registration

    87 

    88 private:

    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  */

   101 class SimpleCriticalSectionLock {

   102 private:

   103     SimpleCriticalSection *lock;

   104 public:

   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