X-Git-Url: https://notaz.gp2x.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=source%2Fmupen64plus-core%2Fsrc%2Fmain%2Fworkqueue.c;fp=source%2Fmupen64plus-core%2Fsrc%2Fmain%2Fworkqueue.c;h=bd969bfda60972ac790612e2e2d24306b1f5de66;hb=451ab91e3827a6384981b3300e2a7000d2eaba58;hp=0000000000000000000000000000000000000000;hpb=a2ab25365b5b0dddbee476d695d8a31151407581;p=mupen64plus-pandora.git diff --git a/source/mupen64plus-core/src/main/workqueue.c b/source/mupen64plus-core/src/main/workqueue.c new file mode 100644 index 0000000..bd969bf --- /dev/null +++ b/source/mupen64plus-core/src/main/workqueue.c @@ -0,0 +1,185 @@ +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * Mupen64plus - util.h * + * Mupen64Plus homepage: http://code.google.com/p/mupen64plus/ * + * Copyright (C) 2012 Mupen64plus development team * + * * + * 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 program 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 this program; if not, write to the * + * Free Software Foundation, Inc., * + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * + * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ + +#include "workqueue.h" +#include "api/callbacks.h" + +#include +#include + +#define WORKQUEUE_THREADS 1 + +struct workqueue_mgmt_globals { + struct list_head work_queue; + struct list_head thread_queue; + struct list_head thread_list; + SDL_mutex *lock; +}; + +struct workqueue_thread { + SDL_Thread *thread; + SDL_cond *work_avail; + struct list_head list; + struct list_head list_mgmt; +}; + +static struct workqueue_mgmt_globals workqueue_mgmt; + +static void workqueue_dismiss(struct work_struct *work) +{ +} + +static struct work_struct *workqueue_get_work(struct workqueue_thread *thread) +{ + int found = 0; + struct work_struct *work; + + while (1) { + SDL_LockMutex(workqueue_mgmt.lock); + list_del_init(&thread->list); + if (!list_empty(&workqueue_mgmt.work_queue)) { + found = 1; + work = list_first_entry(&workqueue_mgmt.work_queue, struct work_struct, list); + list_del_init(&work->list); + } else { + list_add(&thread->list, &workqueue_mgmt.thread_queue); + SDL_CondWait(thread->work_avail, workqueue_mgmt.lock); + } + SDL_UnlockMutex(workqueue_mgmt.lock); + + if (found) + break; + } + + return work; +} + +static int workqueue_thread_handler(void *data) +{ + struct workqueue_thread *thread = data; + struct work_struct *work; + + while (1) { + work = workqueue_get_work(thread); + if (work->func == workqueue_dismiss) { + free(work); + break; + } + + work->func(work); + } + + return 0; +} + +int workqueue_init(void) +{ + size_t i; + struct workqueue_thread *thread; + + memset(&workqueue_mgmt, 0, sizeof(workqueue_mgmt)); + INIT_LIST_HEAD(&workqueue_mgmt.work_queue); + INIT_LIST_HEAD(&workqueue_mgmt.thread_queue); + INIT_LIST_HEAD(&workqueue_mgmt.thread_list); + + workqueue_mgmt.lock = SDL_CreateMutex(); + if (!workqueue_mgmt.lock) { + DebugMessage(M64MSG_ERROR, "Could not create workqueue management"); + return -1; + } + + SDL_LockMutex(workqueue_mgmt.lock); + for (i = 0; i < WORKQUEUE_THREADS; i++) { + thread = malloc(sizeof(*thread)); + if (!thread) { + DebugMessage(M64MSG_ERROR, "Could not create workqueue thread management data"); + SDL_UnlockMutex(workqueue_mgmt.lock); + return -1; + } + + memset(thread, 0, sizeof(*thread)); + list_add(&thread->list_mgmt, &workqueue_mgmt.thread_list); + INIT_LIST_HEAD(&thread->list); + thread->work_avail = SDL_CreateCond(); + if (!thread->work_avail) { + DebugMessage(M64MSG_ERROR, "Could not create workqueue thread work_avail condition"); + SDL_UnlockMutex(workqueue_mgmt.lock); + return -1; + } + +#if SDL_VERSION_ATLEAST(2,0,0) + thread->thread = SDL_CreateThread(workqueue_thread_handler, "m64pwq", thread); +#else + thread->thread = SDL_CreateThread(workqueue_thread_handler, thread); +#endif + if (!thread->thread) { + DebugMessage(M64MSG_ERROR, "Could not create workqueue thread handler"); + SDL_UnlockMutex(workqueue_mgmt.lock); + return -1; + } + } + SDL_UnlockMutex(workqueue_mgmt.lock); + + return 0; +} + +void workqueue_shutdown(void) +{ + size_t i; + int status; + struct work_struct *work; + struct workqueue_thread *thread, *safe; + + for (i = 0; i < WORKQUEUE_THREADS; i++) { + work = malloc(sizeof(*work)); + init_work(work, workqueue_dismiss); + queue_work(work); + } + + list_for_each_entry_safe(thread, safe, &workqueue_mgmt.thread_list, struct workqueue_thread, list_mgmt) { + list_del(&thread->list_mgmt); + SDL_WaitThread(thread->thread, &status); + SDL_DestroyCond(thread->work_avail); + free(thread); + } + + if (!list_empty(&workqueue_mgmt.work_queue)) + DebugMessage(M64MSG_WARNING, "Stopped workqueue with work still pending"); + + SDL_DestroyMutex(workqueue_mgmt.lock); +} + +int queue_work(struct work_struct *work) +{ + struct workqueue_thread *thread; + + SDL_LockMutex(workqueue_mgmt.lock); + list_add_tail(&work->list, &workqueue_mgmt.work_queue); + if (!list_empty(&workqueue_mgmt.thread_queue)) { + thread = list_first_entry(&workqueue_mgmt.thread_queue, struct workqueue_thread, list); + list_del_init(&thread->list); + + SDL_CondSignal(thread->work_avail); + } + SDL_UnlockMutex(workqueue_mgmt.lock); + + return 0; +}