SDL 2.0
SDL_sysmutex.cpp
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1/*
2 Simple DirectMedia Layer
3 Copyright (C) 1997-2019 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
23extern "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 */
36extern "C"
39{
40 /* Allocate and initialize the mutex */
41 try {
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 &) {
49 return NULL;
50 }
51}
52
53/* Free the mutex */
54extern "C"
55void
57{
58 if (mutex) {
59 delete mutex;
60 }
61}
62
63/* Lock the semaphore */
64extern "C"
65int
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 */
83int
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) {
93 }
94 return retval;
95}
96
97/* Unlock the mutex */
98extern "C"
99int
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: */
#define SDL_SetError
#define SDL_OutOfMemory()
Definition: SDL_error.h:52
#define SDL_MUTEX_TIMEDOUT
Definition: SDL_mutex.h:44
int SDL_mutexP(SDL_mutex *mutex)
void SDL_DestroyMutex(SDL_mutex *mutex)
int SDL_mutexV(SDL_mutex *mutex)
int SDL_TryLockMutex(SDL_mutex *mutex)
SDL_mutex * SDL_CreateMutex(void)
#define NULL
Definition: begin_code.h:167
std::recursive_mutex cpp_mutex
SDL_bool retval
static SDL_mutex * mutex
Definition: testlock.c:23