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
  21#define TYPE_IOTHREAD "iothread"
  22
  23struct IOThread {
  24    Object parent_obj;
  25
  26    QemuThread thread;
  27    AioContext *ctx;
  28    bool run_gcontext;          /* whether we should run gcontext */
  29    GMainContext *worker_context;
  30    GMainLoop *main_loop;
  31    QemuSemaphore init_done_sem; /* is thread init done? */
  32    bool stopping;              /* has iothread_stop() been called? */
  33    bool running;               /* should iothread_run() continue? */
  34    int thread_id;
  35
  36    /* AioContext poll parameters */
  37    int64_t poll_max_ns;
  38    int64_t poll_grow;
  39    int64_t poll_shrink;
  40
  41    /* AioContext AIO engine parameters */
  42    int64_t aio_max_batch;
  43};
  44typedef struct IOThread IOThread;
  45
  46DECLARE_INSTANCE_CHECKER(IOThread, IOTHREAD,
  47                         TYPE_IOTHREAD)
  48
  49char *iothread_get_id(IOThread *iothread);
  50IOThread *iothread_by_id(const char *id);
  51AioContext *iothread_get_aio_context(IOThread *iothread);
  52GMainContext *iothread_get_g_main_context(IOThread *iothread);
  53
  54/*
  55 * Helpers used to allocate iothreads for internal use.  These
  56 * iothreads will not be seen by monitor clients when query using
  57 * "query-iothreads".
  58 */
  59IOThread *iothread_create(const char *id, Error **errp);
  60void iothread_stop(IOThread *iothread);
  61void iothread_destroy(IOThread *iothread);
  62
  63/*
  64 * Returns true if executing withing IOThread context,
  65 * false otherwise.
  66 */
  67bool qemu_in_iothread(void);
  68
  69#endif /* IOTHREAD_H */
  70