RetroArch/autosave.c

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/* RetroArch - A frontend for libretro.
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* Copyright (C) 2010-2014 - Hans-Kristian Arntzen
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
*/
#include "autosave.h"
#include "thread.h"
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#include <stdlib.h>
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#include "boolean.h"
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#include <string.h>
#include <stdio.h>
#include "general.h"
struct autosave
{
volatile bool quit;
slock_t *lock;
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slock_t *cond_lock;
scond_t *cond;
sthread_t *thread;
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void *buffer;
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const void *retro_buffer;
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const char *path;
size_t bufsize;
unsigned interval;
};
static void autosave_thread(void *data)
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{
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autosave_t *save = (autosave_t*)data;
bool first_log = true;
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while (!save->quit)
{
autosave_lock(save);
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bool differ = memcmp(save->buffer, save->retro_buffer, save->bufsize) != 0;
if (differ)
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memcpy(save->buffer, save->retro_buffer, save->bufsize);
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autosave_unlock(save);
if (differ)
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{
/* Should probably deal with this more elegantly. */
FILE *file = fopen(save->path, "wb");
if (file)
{
/* Avoid spamming down stderr ... */
if (first_log)
{
RARCH_LOG("Autosaving SRAM to \"%s\", will continue to check every %u seconds ...\n",
save->path, save->interval);
first_log = false;
}
else
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RARCH_LOG("SRAM changed ... autosaving ...\n");
bool failed = false;
failed |= fwrite(save->buffer, 1, save->bufsize, file) != save->bufsize;
failed |= fflush(file) != 0;
failed |= fclose(file) != 0;
if (failed)
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RARCH_WARN("Failed to autosave SRAM. Disk might be full.\n");
}
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}
slock_lock(save->cond_lock);
if (!save->quit)
scond_wait_timeout(save->cond, save->cond_lock,
save->interval * 1000000LL);
slock_unlock(save->cond_lock);
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}
}
autosave_t *autosave_new(const char *path, const void *data, size_t size,
unsigned interval)
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{
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autosave_t *handle = (autosave_t*)calloc(1, sizeof(*handle));
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if (!handle)
return NULL;
handle->bufsize = size;
handle->interval = interval;
handle->path = path;
handle->buffer = malloc(size);
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handle->retro_buffer = data;
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if (!handle->buffer)
{
free(handle);
return NULL;
}
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memcpy(handle->buffer, handle->retro_buffer, handle->bufsize);
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handle->lock = slock_new();
handle->cond_lock = slock_new();
handle->cond = scond_new();
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handle->thread = sthread_create(autosave_thread, handle);
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return handle;
}
void autosave_lock(autosave_t *handle)
{
slock_lock(handle->lock);
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}
void autosave_unlock(autosave_t *handle)
{
slock_unlock(handle->lock);
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}
void autosave_free(autosave_t *handle)
{
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if (!handle)
return;
slock_lock(handle->cond_lock);
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handle->quit = true;
slock_unlock(handle->cond_lock);
scond_signal(handle->cond);
sthread_join(handle->thread);
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slock_free(handle->lock);
slock_free(handle->cond_lock);
scond_free(handle->cond);
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free(handle->buffer);
free(handle);
}
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void lock_autosave(void)
{
unsigned i;
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for (i = 0; i < g_extern.num_autosave; i++)
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{
if (g_extern.autosave[i])
autosave_lock(g_extern.autosave[i]);
}
}
void unlock_autosave(void)
{
unsigned i;
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for (i = 0; i < g_extern.num_autosave; i++)
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{
if (g_extern.autosave[i])
autosave_unlock(g_extern.autosave[i]);
}
}