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
  24 struct 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 };
  42 typedef struct IOThread IOThread;
  43
  44 DECLARE_INSTANCE_CHECKER(IOThread, IOTHREAD,
  45                          TYPE_IOTHREAD)
  46
  47 char *iothread_get_id(IOThread *iothread);
  48 IOThread *iothread_by_id(const char *id);
  49 AioContext *iothread_get_aio_context(IOThread *iothread);
  50 GMainContext *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  */
  57 IOThread *iothread_create(const char *id, Error **errp);
  58 void iothread_stop(IOThread *iothread);
  59 void iothread_destroy(IOThread *iothread);
  60
  61 /*
  62  * Returns true if executing withing IOThread context,
  63  * false otherwise.
  64  */
  65 bool qemu_in_iothread(void);
  66
  67 #endif /* IOTHREAD_H */