LXR qemu/include/sysemu/iothread.h

   1/*
   2 * Event loop thread
   3 *
   4 * Copyright Red Hat Inc., 2013
   5 *
   6 * Authors:
   7 *  Stefan Hajnoczi   <stefanha@redhat.com>
   8 *
   9 * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10 * See the COPYING file in the top-level directory.
  11 *
  12 */
  13
  14#ifndef IOTHREAD_H
  15#define IOTHREAD_H
  16
  17#include "block/aio.h"
  18#include "qemu/thread.h"
  19#include "qom/object.h"
  20#include "sysemu/event-loop-base.h"
  21
  22#define TYPE_IOTHREAD "iothread"
  23
  24struct IOThread {
  25    EventLoopBase parent_obj;
  26
  27    QemuThread thread;
  28    AioContext *ctx;
  29    bool run_gcontext;          /* whether we should run gcontext */
  30    GMainContext *worker_context;
  31    GMainLoop *main_loop;
  32    QemuSemaphore init_done_sem; /* is thread init done? */
  33    bool stopping;              /* has iothread_stop() been called? */
  34    bool running;               /* should iothread_run() continue? */
  35    int thread_id;
  36
  37    /* AioContext poll parameters */
  38    int64_t poll_max_ns;
  39    int64_t poll_grow;
  40    int64_t poll_shrink;
  41};
  42typedef struct IOThread IOThread;
  43
  44DECLARE_INSTANCE_CHECKER(IOThread, IOTHREAD,
  45                         TYPE_IOTHREAD)
  46
  47char *iothread_get_id(IOThread *iothread);
  48IOThread *iothread_by_id(const char *id);
  49AioContext *iothread_get_aio_context(IOThread *iothread);
  50GMainContext *iothread_get_g_main_context(IOThread *iothread);
  51
  52/*
  53 * Helpers used to allocate iothreads for internal use.  These
  54 * iothreads will not be seen by monitor clients when query using
  55 * "query-iothreads".
  56 */
  57IOThread *iothread_create(const char *id, Error **errp);
  58void iothread_stop(IOThread *iothread);
  59void iothread_destroy(IOThread *iothread);
  60
  61/*
  62 * Returns true if executing withing IOThread context,
  63 * false otherwise.
  64 */
  65bool qemu_in_iothread(void);
  66
  67#endif /* IOTHREAD_H */
  68