src/thread/windows/SDL_sysmutex.c
changeset 5062 e8916fe9cfc8
parent 3697 f7b03b6838cb
child 5090 327f181542f1
equal deleted inserted replaced
5061:9e9940eae455 5062:e8916fe9cfc8
       
     1 /*
       
     2     SDL - Simple DirectMedia Layer
       
     3     Copyright (C) 1997-2010 Sam Lantinga
       
     4 
       
     5     This library is free software; you can redistribute it and/or
       
     6     modify it under the terms of the GNU Lesser General Public
       
     7     License as published by the Free Software Foundation; either
       
     8     version 2.1 of the License, or (at your option) any later version.
       
     9 
       
    10     This library is distributed in the hope that it will be useful,
       
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
       
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       
    13     Lesser General Public License for more details.
       
    14 
       
    15     You should have received a copy of the GNU Lesser General Public
       
    16     License along with this library; if not, write to the Free Software
       
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
       
    18 
       
    19     Sam Lantinga
       
    20     slouken@libsdl.org
       
    21 */
       
    22 #include "SDL_config.h"
       
    23 
       
    24 /* Mutex functions using the Win32 API */
       
    25 
       
    26 #define WIN32_LEAN_AND_MEAN
       
    27 #include <windows.h>
       
    28 
       
    29 #include "SDL_mutex.h"
       
    30 
       
    31 
       
    32 struct SDL_mutex
       
    33 {
       
    34     HANDLE id;
       
    35 };
       
    36 
       
    37 /* Create a mutex */
       
    38 SDL_mutex *
       
    39 SDL_CreateMutex(void)
       
    40 {
       
    41     SDL_mutex *mutex;
       
    42 
       
    43     /* Allocate mutex memory */
       
    44     mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex));
       
    45     if (mutex) {
       
    46         /* Create the mutex, with initial value signaled */
       
    47         mutex->id = CreateMutex(NULL, FALSE, NULL);
       
    48         if (!mutex->id) {
       
    49             SDL_SetError("Couldn't create mutex");
       
    50             SDL_free(mutex);
       
    51             mutex = NULL;
       
    52         }
       
    53     } else {
       
    54         SDL_OutOfMemory();
       
    55     }
       
    56     return (mutex);
       
    57 }
       
    58 
       
    59 /* Free the mutex */
       
    60 void
       
    61 SDL_DestroyMutex(SDL_mutex * mutex)
       
    62 {
       
    63     if (mutex) {
       
    64         if (mutex->id) {
       
    65             CloseHandle(mutex->id);
       
    66             mutex->id = 0;
       
    67         }
       
    68         SDL_free(mutex);
       
    69     }
       
    70 }
       
    71 
       
    72 /* Lock the mutex */
       
    73 int
       
    74 SDL_mutexP(SDL_mutex * mutex)
       
    75 {
       
    76     if (mutex == NULL) {
       
    77         SDL_SetError("Passed a NULL mutex");
       
    78         return -1;
       
    79     }
       
    80     if (WaitForSingleObject(mutex->id, INFINITE) == WAIT_FAILED) {
       
    81         SDL_SetError("Couldn't wait on mutex");
       
    82         return -1;
       
    83     }
       
    84     return (0);
       
    85 }
       
    86 
       
    87 /* Unlock the mutex */
       
    88 int
       
    89 SDL_mutexV(SDL_mutex * mutex)
       
    90 {
       
    91     if (mutex == NULL) {
       
    92         SDL_SetError("Passed a NULL mutex");
       
    93         return -1;
       
    94     }
       
    95     if (ReleaseMutex(mutex->id) == FALSE) {
       
    96         SDL_SetError("Couldn't release mutex");
       
    97         return -1;
       
    98     }
       
    99     return (0);
       
   100 }
       
   101 
       
   102 /* vi: set ts=4 sw=4 expandtab: */