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