blob: 5a8e2c417a27f4365dd165721f105785520f26f5 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2014 by Michael Sevakis
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#define RB_FILESYSTEM_OS
#include "config.h"
#include "system.h"
#include "thread-sdl.h"
#include "mutex.h"
#include "file.h"
#ifdef HAVE_SDL_THREADS
#define YIELD_THRESHOLD 512
static bool initialized = false;
static struct mutex readwrite_mtx;
/* Allow other threads to run while performing I/O */
ssize_t os_sdl_readwrite(int osfd, void *buf, size_t nbyte, bool dowrite)
{
if (!initialized)
{
mutex_init(&readwrite_mtx);
initialized = true;
}
mutex_lock(&readwrite_mtx);
void *mythread = nbyte > YIELD_THRESHOLD ? sim_thread_unlock() : NULL;
ssize_t rc = dowrite ? write(osfd, buf, nbyte) : read(osfd, buf, nbyte);
if (mythread)
sim_thread_lock(mythread);
mutex_unlock(&readwrite_mtx);
return rc;
}
#endif /* HAVE_SDL_THREADS */
|
