src/thread/stdcpp/SDL_sysmutex.cpp
author Sam Lantinga <slouken@libsdl.org>
Thu, 13 Mar 2014 00:40:08 -0700
changeset 8615 097646deaef2
parent 8611 a762dfc67e1a
child 9619 b94b6d0bff0f
permissions -rw-r--r--
Fixed the copyright date on files contributed by David Ludwig
     1 /*
     2   Simple DirectMedia Layer
     3   Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
     4 
     5   This software is provided 'as-is', without any express or implied
     6   warranty.  In no event will the authors be held liable for any damages
     7   arising from the use of this software.
     8 
     9   Permission is granted to anyone to use this software for any purpose,
    10   including commercial applications, and to alter it and redistribute it
    11   freely, subject to the following restrictions:
    12 
    13   1. The origin of this software must not be misrepresented; you must not
    14      claim that you wrote the original software. If you use this software
    15      in a product, an acknowledgment in the product documentation would be
    16      appreciated but is not required.
    17   2. Altered source versions must be plainly marked as such, and must not be
    18      misrepresented as being the original software.
    19   3. This notice may not be removed or altered from any source distribution.
    20 */
    21 #include "../../SDL_internal.h"
    22 
    23 extern "C" {
    24 #include "SDL_thread.h"
    25 #include "SDL_systhread_c.h"
    26 #include "SDL_log.h"
    27 }
    28 
    29 #include <system_error>
    30 
    31 #include "SDL_sysmutex_c.h"
    32 #include <Windows.h>
    33 
    34 
    35 /* Create a mutex */
    36 extern "C"
    37 SDL_mutex *
    38 SDL_CreateMutex(void)
    39 {
    40     /* Allocate and initialize the mutex */
    41     try {
    42         SDL_mutex * mutex = new SDL_mutex;
    43         return mutex;
    44     } catch (std::system_error & ex) {
    45         SDL_SetError("unable to create a C++ mutex: code=%d; %s", ex.code(), ex.what());
    46         return NULL;
    47     } catch (std::bad_alloc &) {
    48         SDL_OutOfMemory();
    49         return NULL;
    50     }
    51 }
    52 
    53 /* Free the mutex */
    54 extern "C"
    55 void
    56 SDL_DestroyMutex(SDL_mutex * mutex)
    57 {
    58     if (mutex) {
    59         delete mutex;
    60     }
    61 }
    62 
    63 /* Lock the semaphore */
    64 extern "C"
    65 int
    66 SDL_mutexP(SDL_mutex * mutex)
    67 {
    68     if (mutex == NULL) {
    69         SDL_SetError("Passed a NULL mutex");
    70         return -1;
    71     }
    72 
    73     try {
    74         mutex->cpp_mutex.lock();
    75         return 0;
    76     } catch (std::system_error & ex) {
    77         SDL_SetError("unable to lock a C++ mutex: code=%d; %s", ex.code(), ex.what());
    78         return -1;
    79     }
    80 }
    81 
    82 /* TryLock the mutex */
    83 int
    84 SDL_TryLockMutex(SDL_mutex * mutex)
    85 {
    86     int retval = 0;
    87     if (mutex == NULL) {
    88         return SDL_SetError("Passed a NULL mutex");
    89     }
    90 
    91     if (mutex->cpp_mutex.try_lock() == false) {
    92         retval = SDL_MUTEX_TIMEDOUT;
    93     }
    94     return retval;
    95 }
    96 
    97 /* Unlock the mutex */
    98 extern "C"
    99 int
   100 SDL_mutexV(SDL_mutex * mutex)
   101 {
   102     if (mutex == NULL) {
   103         SDL_SetError("Passed a NULL mutex");
   104         return -1;
   105     }
   106 
   107     mutex->cpp_mutex.unlock();
   108     return 0;
   109 }
   110 
   111 /* vi: set ts=4 sw=4 expandtab: */