coroutine: remove GThread implementation

The GThread implementation is not functional enough to actually
run QEMU reliably. While it was potentially useful for debugging,
we have a scripts/qemugdb/coroutine.py to enable tracing of
ucontext coroutines in GDB, so that removes the only reason for
GThread to exist.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Acked-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

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;
-}