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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
|
/*
Copyright 2016-2020 Arisotura
This file is part of melonDS.
melonDS 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 3 of the License, or (at your option)
any later version.
melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with melonDS. If not, see http://www.gnu.org/licenses/.
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
#include "NDSCart_SRAMManager.h"
#include "Platform.h"
namespace NDSCart_SRAMManager
{
Platform::Thread* FlushThread;
bool FlushThreadRunning;
Platform::Mutex* SecondaryBufferLock;
char Path[1024];
u8* Buffer;
u32 Length;
u8* SecondaryBuffer;
u32 SecondaryBufferLength;
time_t TimeAtLastFlushRequest;
// We keep versions in case the user closes the application before
// a flush cycle is finished.
u32 PreviousFlushVersion;
u32 FlushVersion;
void FlushThreadFunc();
void FlushSecondaryBufferToFile();
bool Init()
{
FlushThread = Platform::Thread_Create(FlushThreadFunc);
FlushThreadRunning = true;
SecondaryBufferLock = Platform::Mutex_Create();
return true;
}
void DeInit()
{
if (FlushThreadRunning)
{
FlushThreadRunning = false;
Platform::Thread_Wait(FlushThread);
Platform::Thread_Free(FlushThread);
FlushSecondaryBufferToFile();
}
delete SecondaryBuffer;
Platform::Mutex_Free(SecondaryBufferLock);
}
void Setup(const char* path, u8* buffer, u32 length)
{
// Flush SRAM in case there is unflushed data from previous state.
FlushSecondaryBufferToFile();
Platform::Mutex_Lock(SecondaryBufferLock);
strncpy(Path, path, 1023);
Path[1023] = '\0';
Buffer = buffer;
Length = length;
delete SecondaryBuffer; // Delete secondary buffer, there might be previous state.
SecondaryBuffer = new u8[length];
SecondaryBufferLength = length;
FlushVersion = 0;
PreviousFlushVersion = 0;
TimeAtLastFlushRequest = 0;
Platform::Mutex_Unlock(SecondaryBufferLock);
}
void RequestFlush()
{
Platform::Mutex_Lock(SecondaryBufferLock);
printf("NDS SRAM: Flush requested\n");
memcpy(SecondaryBuffer, Buffer, Length);
FlushVersion++;
TimeAtLastFlushRequest = time(NULL);
Platform::Mutex_Unlock(SecondaryBufferLock);
}
void FlushThreadFunc()
{
for (;;)
{
Platform::Sleep(100 * 1000); // 100ms
if (!FlushThreadRunning) return;
// We debounce for two seconds after last flush request to ensure that writing has finished.
if (TimeAtLastFlushRequest == 0 || difftime(time(NULL), TimeAtLastFlushRequest) < 2)
{
continue;
}
FlushSecondaryBufferToFile();
}
}
void FlushSecondaryBufferToFile()
{
if (FlushVersion == PreviousFlushVersion)
{
return;
}
Platform::Mutex_Lock(SecondaryBufferLock);
FILE* f = Platform::OpenFile(Path, "wb");
if (f)
{
printf("NDS SRAM: Written\n");
fwrite(SecondaryBuffer, SecondaryBufferLength, 1, f);
fclose(f);
}
PreviousFlushVersion = FlushVersion;
TimeAtLastFlushRequest = 0;
Platform::Mutex_Unlock(SecondaryBufferLock);
}
}
|