SDL
2.0
SDL_sysmutex.c
Go to the documentation of this file.
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "../../SDL_internal.h"
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#if SDL_THREAD_WINDOWS
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/* Mutex functions using the Win32 API */
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#include "../../core/windows/SDL_windows.h"
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#include "
SDL_mutex.h
"
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struct
SDL_mutex
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{
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CRITICAL_SECTION cs;
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};
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/* Create a mutex */
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SDL_mutex
*
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SDL_CreateMutex
(
void
)
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{
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SDL_mutex
*
mutex
;
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/* Allocate mutex memory */
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mutex
= (
SDL_mutex
*)
SDL_malloc
(
sizeof
(*
mutex
));
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if
(
mutex
) {
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/* Initialize */
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/* On SMP systems, a non-zero spin count generally helps performance */
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#if __WINRT__
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InitializeCriticalSectionEx(&
mutex
->cs, 2000, 0);
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#else
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InitializeCriticalSectionAndSpinCount(&
mutex
->cs, 2000);
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#endif
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}
else
{
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SDL_OutOfMemory
();
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}
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return
(
mutex
);
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}
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/* Free the mutex */
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void
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SDL_DestroyMutex
(
SDL_mutex
*
mutex
)
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{
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if
(
mutex
) {
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DeleteCriticalSection(&
mutex
->cs);
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SDL_free
(
mutex
);
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}
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}
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/* Lock the mutex */
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int
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SDL_LockMutex
(
SDL_mutex
*
mutex
)
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{
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if
(
mutex
==
NULL
) {
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return
SDL_SetError
(
"Passed a NULL mutex"
);
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}
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EnterCriticalSection(&
mutex
->cs);
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return
(0);
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}
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/* TryLock the mutex */
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int
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SDL_TryLockMutex
(
SDL_mutex
*
mutex
)
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{
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int
retval
= 0;
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if
(
mutex
==
NULL
) {
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return
SDL_SetError
(
"Passed a NULL mutex"
);
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}
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if
(TryEnterCriticalSection(&
mutex
->cs) == 0) {
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retval
=
SDL_MUTEX_TIMEDOUT
;
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}
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return
retval
;
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}
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/* Unlock the mutex */
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int
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SDL_UnlockMutex
(
SDL_mutex
*
mutex
)
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{
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if
(
mutex
==
NULL
) {
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return
SDL_SetError
(
"Passed a NULL mutex"
);
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}
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LeaveCriticalSection(&
mutex
->cs);
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return
(0);
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}
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#endif
/* SDL_THREAD_WINDOWS */
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/* vi: set ts=4 sw=4 expandtab: */
SDL_LockMutex
int SDL_LockMutex(SDL_mutex *mutex)
Definition:
SDL_sysmutex.c:73
NULL
#define NULL
Definition:
begin_code.h:167
SDL_mutex
Definition:
SDL_sysmutex.c:30
mutex
static SDL_mutex * mutex
Definition:
testlock.c:23
SDL_MUTEX_TIMEDOUT
#define SDL_MUTEX_TIMEDOUT
Definition:
SDL_mutex.h:44
SDL_CreateMutex
SDL_mutex * SDL_CreateMutex(void)
Definition:
SDL_sysmutex.c:38
SDL_DestroyMutex
void SDL_DestroyMutex(SDL_mutex *mutex)
Definition:
SDL_sysmutex.c:61
SDL_UnlockMutex
int SDL_UnlockMutex(SDL_mutex *mutex)
Definition:
SDL_sysmutex.c:162
retval
SDL_bool retval
Definition:
testgamecontroller.c:65
SDL_free
#define SDL_free
Definition:
SDL_dynapi_overrides.h:377
SDL_mutex.h
SDL_OutOfMemory
#define SDL_OutOfMemory()
Definition:
SDL_error.h:52
SDL_SetError
#define SDL_SetError
Definition:
SDL_dynapi_overrides.h:30
SDL_TryLockMutex
int SDL_TryLockMutex(SDL_mutex *mutex)
Definition:
SDL_sysmutex.c:103
SDL_malloc
#define SDL_malloc
Definition:
SDL_dynapi_overrides.h:374
src
thread
windows
SDL_sysmutex.c
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