diff options
Diffstat (limited to 'util')
| -rw-r--r-- | util/coroutine-gthread.c | 198 |
1 files changed, 0 insertions, 198 deletions
diff --git a/util/coroutine-gthread.c b/util/coroutine-gthread.c deleted file mode 100644 index 62bfb4015d..0000000000 --- a/util/coroutine-gthread.c +++ /dev/null @@ -1,198 +0,0 @@ -/* - * GThread coroutine initialization code - * - * Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws> - * Copyright (C) 2011 Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2.0 of the License, or (at your option) any later version. - * - * This library 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 - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, see <http://www.gnu.org/licenses/>. - */ - -#include "qemu/osdep.h" -#include "qemu-common.h" -#include "qemu/coroutine_int.h" - -typedef struct { - Coroutine base; - GThread *thread; - bool runnable; - bool free_on_thread_exit; - CoroutineAction action; -} CoroutineGThread; - -static CompatGMutex coroutine_lock; -static CompatGCond coroutine_cond; - -/* GLib 2.31 and beyond deprecated various parts of the thread API, - * but the new interfaces are not available in older GLib versions - * so we have to cope with both. - */ -#if GLIB_CHECK_VERSION(2, 31, 0) -/* Awkwardly, the GPrivate API doesn't provide a way to update the - * GDestroyNotify handler for the coroutine key dynamically. So instead - * we track whether or not the CoroutineGThread should be freed on - * thread exit / coroutine key update using the free_on_thread_exit - * field. - */ -static void coroutine_destroy_notify(gpointer data) -{ - CoroutineGThread *co = data; - if (co && co->free_on_thread_exit) { - g_free(co); - } -} - -static GPrivate coroutine_key = G_PRIVATE_INIT(coroutine_destroy_notify); - -static inline CoroutineGThread *get_coroutine_key(void) -{ - return g_private_get(&coroutine_key); -} - -static inline void set_coroutine_key(CoroutineGThread *co, - bool free_on_thread_exit) -{ - /* Unlike g_static_private_set() this does not call the GDestroyNotify - * if the previous value of the key was NULL. Fortunately we only need - * the GDestroyNotify in the non-NULL key case. - */ - co->free_on_thread_exit = free_on_thread_exit; - g_private_replace(&coroutine_key, co); -} - -static inline GThread *create_thread(GThreadFunc func, gpointer data) -{ - return g_thread_new("coroutine", func, data); -} - -#else - -/* Handle older GLib versions */ - -static GStaticPrivate coroutine_key = G_STATIC_PRIVATE_INIT; - -static inline CoroutineGThread *get_coroutine_key(void) -{ - return g_static_private_get(&coroutine_key); -} - -static inline void set_coroutine_key(CoroutineGThread *co, - bool free_on_thread_exit) -{ - g_static_private_set(&coroutine_key, co, - free_on_thread_exit ? (GDestroyNotify)g_free : NULL); -} - -static inline GThread *create_thread(GThreadFunc func, gpointer data) -{ - return g_thread_create_full(func, data, 0, TRUE, TRUE, - G_THREAD_PRIORITY_NORMAL, NULL); -} - -#endif - - -static void __attribute__((constructor)) coroutine_init(void) -{ -#if !GLIB_CHECK_VERSION(2, 31, 0) - if (!g_thread_supported()) { - g_thread_init(NULL); - } -#endif -} - -static void coroutine_wait_runnable_locked(CoroutineGThread *co) -{ - while (!co->runnable) { - g_cond_wait(&coroutine_cond, &coroutine_lock); - } -} - -static void coroutine_wait_runnable(CoroutineGThread *co) -{ - g_mutex_lock(&coroutine_lock); - coroutine_wait_runnable_locked(co); - g_mutex_unlock(&coroutine_lock); -} - -static gpointer coroutine_thread(gpointer opaque) -{ - CoroutineGThread *co = opaque; - - set_coroutine_key(co, false); - coroutine_wait_runnable(co); - co->base.entry(co->base.entry_arg); - qemu_coroutine_switch(&co->base, co->base.caller, COROUTINE_TERMINATE); - return NULL; -} - -Coroutine *qemu_coroutine_new(void) -{ - CoroutineGThread *co; - - co = g_malloc0(sizeof(*co)); - co->thread = create_thread(coroutine_thread, co); - if (!co->thread) { - g_free(co); - return NULL; - } - return &co->base; -} - -void qemu_coroutine_delete(Coroutine *co_) -{ - CoroutineGThread *co = DO_UPCAST(CoroutineGThread, base, co_); - - g_thread_join(co->thread); - g_free(co); -} - -CoroutineAction qemu_coroutine_switch(Coroutine *from_, - Coroutine *to_, - CoroutineAction action) -{ - CoroutineGThread *from = DO_UPCAST(CoroutineGThread, base, from_); - CoroutineGThread *to = DO_UPCAST(CoroutineGThread, base, to_); - - g_mutex_lock(&coroutine_lock); - from->runnable = false; - from->action = action; - to->runnable = true; - to->action = action; - g_cond_broadcast(&coroutine_cond); - - if (action != COROUTINE_TERMINATE) { - coroutine_wait_runnable_locked(from); - } - g_mutex_unlock(&coroutine_lock); - return from->action; -} - -Coroutine *qemu_coroutine_self(void) -{ - CoroutineGThread *co = get_coroutine_key(); - if (!co) { - co = g_malloc0(sizeof(*co)); - co->runnable = true; - set_coroutine_key(co, true); - } - - return &co->base; -} - -bool qemu_in_coroutine(void) -{ - CoroutineGThread *co = get_coroutine_key(); - - return co && co->base.caller; -} |