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* Event loop thread
* Copyright Red Hat Inc., 2013
* Authors:
* Stefan Hajnoczi <>
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
#ifndef IOTHREAD_H
#define IOTHREAD_H
#include "block/aio.h"
#include "qemu/thread.h"
#include "qom/object.h"
#define TYPE_IOTHREAD "iothread"
struct IOThread {
Object parent_obj;
QemuThread thread;
AioContext *ctx;
bool run_gcontext; /* whether we should run gcontext */
GMainContext *worker_context;
GMainLoop *main_loop;
QemuSemaphore init_done_sem; /* is thread init done? */
bool stopping; /* has iothread_stop() been called? */
bool running; /* should iothread_run() continue? */
int thread_id;
/* AioContext poll parameters */
int64_t poll_max_ns;
int64_t poll_grow;
int64_t poll_shrink;
/* AioContext AIO engine parameters */
int64_t aio_max_batch;
typedef struct IOThread IOThread;
char *iothread_get_id(IOThread *iothread);
IOThread *iothread_by_id(const char *id);
AioContext *iothread_get_aio_context(IOThread *iothread);
GMainContext *iothread_get_g_main_context(IOThread *iothread);
* Helpers used to allocate iothreads for internal use. These
* iothreads will not be seen by monitor clients when query using
* "query-iothreads".
IOThread *iothread_create(const char *id, Error **errp);
void iothread_stop(IOThread *iothread);
void iothread_destroy(IOThread *iothread);
* Returns true if executing withing IOThread context,
* false otherwise.
bool qemu_in_iothread(void);
#endif /* IOTHREAD_H */