target/ppc: Add support for Radix partition-scoped translation
[qemu/ar7.git] / tests / iothread.c
blobd3a2ee9a014c3ae88fd9a25aa2e2da66cb932abc
1 /*
2 * Event loop thread implementation for unit tests
4 * Copyright Red Hat Inc., 2013, 2016
6 * Authors:
7 * Stefan Hajnoczi <stefanha@redhat.com>
8 * Paolo Bonzini <pbonzini@redhat.com>
10 * This work is licensed under the terms of the GNU GPL, version 2 or later.
11 * See the COPYING file in the top-level directory.
15 #include "qemu/osdep.h"
16 #include "qapi/error.h"
17 #include "block/aio.h"
18 #include "qemu/main-loop.h"
19 #include "qemu/rcu.h"
20 #include "iothread.h"
22 struct IOThread {
23 AioContext *ctx;
24 GMainContext *worker_context;
25 GMainLoop *main_loop;
27 QemuThread thread;
28 QemuMutex init_done_lock;
29 QemuCond init_done_cond; /* is thread initialization done? */
30 bool stopping;
33 static __thread IOThread *my_iothread;
35 AioContext *qemu_get_current_aio_context(void)
37 return my_iothread ? my_iothread->ctx : qemu_get_aio_context();
40 static void iothread_init_gcontext(IOThread *iothread)
42 GSource *source;
44 iothread->worker_context = g_main_context_new();
45 source = aio_get_g_source(iothread_get_aio_context(iothread));
46 g_source_attach(source, iothread->worker_context);
47 g_source_unref(source);
48 iothread->main_loop = g_main_loop_new(iothread->worker_context, TRUE);
51 static void *iothread_run(void *opaque)
53 IOThread *iothread = opaque;
55 rcu_register_thread();
57 my_iothread = iothread;
58 qemu_mutex_lock(&iothread->init_done_lock);
59 iothread->ctx = aio_context_new(&error_abort);
62 * We must connect the ctx to a GMainContext, because in older versions
63 * of glib the g_source_ref()/unref() functions are not threadsafe
64 * on sources without a context.
66 iothread_init_gcontext(iothread);
69 * g_main_context_push_thread_default() must be called before anything
70 * in this new thread uses glib.
72 g_main_context_push_thread_default(iothread->worker_context);
74 qemu_cond_signal(&iothread->init_done_cond);
75 qemu_mutex_unlock(&iothread->init_done_lock);
77 while (!atomic_read(&iothread->stopping)) {
78 aio_poll(iothread->ctx, true);
81 g_main_context_pop_thread_default(iothread->worker_context);
82 rcu_unregister_thread();
83 return NULL;
86 static void iothread_stop_bh(void *opaque)
88 IOThread *iothread = opaque;
90 iothread->stopping = true;
93 void iothread_join(IOThread *iothread)
95 aio_bh_schedule_oneshot(iothread->ctx, iothread_stop_bh, iothread);
96 qemu_thread_join(&iothread->thread);
97 g_main_context_unref(iothread->worker_context);
98 g_main_loop_unref(iothread->main_loop);
99 qemu_cond_destroy(&iothread->init_done_cond);
100 qemu_mutex_destroy(&iothread->init_done_lock);
101 aio_context_unref(iothread->ctx);
102 g_free(iothread);
105 IOThread *iothread_new(void)
107 IOThread *iothread = g_new0(IOThread, 1);
109 qemu_mutex_init(&iothread->init_done_lock);
110 qemu_cond_init(&iothread->init_done_cond);
111 qemu_thread_create(&iothread->thread, NULL, iothread_run,
112 iothread, QEMU_THREAD_JOINABLE);
114 /* Wait for initialization to complete */
115 qemu_mutex_lock(&iothread->init_done_lock);
116 while (iothread->ctx == NULL) {
117 qemu_cond_wait(&iothread->init_done_cond,
118 &iothread->init_done_lock);
120 qemu_mutex_unlock(&iothread->init_done_lock);
121 return iothread;
124 AioContext *iothread_get_aio_context(IOThread *iothread)
126 return iothread->ctx;