mirror of
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125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/* SSNES - A Super Nintendo Entertainment System (SNES) Emulator frontend for libsnes.
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* Copyright (C) 2010-2011 - Hans-Kristian Arntzen
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*
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* Some code herein may be based on code found in BSNES.
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*
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* SSNES 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-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* SSNES 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
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with SSNES.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "autosave.h"
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#include "SDL.h"
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#include <stdlib.h>
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#include <stdbool.h>
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#include <string.h>
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#include <stdio.h>
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#include "general.h"
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struct autosave
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{
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volatile bool quit;
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SDL_mutex *lock;
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SDL_mutex *cond_lock;
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SDL_cond *cond;
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SDL_Thread *thread;
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void *buffer;
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const void *snes_buffer;
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const char *path;
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size_t bufsize;
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unsigned interval;
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};
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static int autosave_thread(void *data)
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{
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autosave_t *save = data;
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while (!save->quit)
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{
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autosave_lock(save);
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memcpy(save->buffer, save->snes_buffer, save->bufsize);
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autosave_unlock(save);
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// Should probably deal with this more elegantly.
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FILE *file = fopen(save->path, "wb");
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if (file)
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{
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SSNES_LOG("Autosaving SRAM to \"%s\"\n", save->path);
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bool failed = false;
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failed |= fwrite(save->buffer, 1, save->bufsize, file) != save->bufsize;
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failed |= fflush(file) != 0;
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failed |= fclose(file) != 0;
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if (failed)
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SSNES_WARN("Failed to autosave SRAM! Disk might be full.\n");
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}
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SDL_mutexP(save->cond_lock);
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if (!save->quit)
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SDL_CondWaitTimeout(save->cond, save->cond_lock, save->interval * 1000);
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SDL_mutexV(save->cond_lock);
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}
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return 0;
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}
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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 = calloc(1, sizeof(*handle));
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if (!handle)
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return NULL;
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handle->bufsize = size;
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handle->interval = interval;
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handle->path = path;
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handle->buffer = malloc(size);
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handle->snes_buffer = data;
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if (!handle->buffer)
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{
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free(handle);
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return NULL;
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}
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handle->lock = SDL_CreateMutex();
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handle->cond_lock = SDL_CreateMutex();
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handle->cond = SDL_CreateCond();
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handle->thread = SDL_CreateThread(autosave_thread, handle);
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return handle;
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}
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void autosave_lock(autosave_t *handle)
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{
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SDL_mutexP(handle->lock);
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}
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void autosave_unlock(autosave_t *handle)
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{
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SDL_mutexV(handle->lock);
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}
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void autosave_free(autosave_t *handle)
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{
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SDL_mutexP(handle->cond_lock);
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handle->quit = true;
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SDL_mutexV(handle->cond_lock);
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SDL_CondSignal(handle->cond);
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SDL_WaitThread(handle->thread, NULL);
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SDL_DestroyMutex(handle->lock);
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SDL_DestroyMutex(handle->cond_lock);
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SDL_DestroyCond(handle->cond);
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free(handle->buffer);
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free(handle);
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}
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