qemu/hw/9pfs/virtio-9p-coth.c

   1 /*
   2  * Virtio 9p backend
   3  *
   4  * Copyright IBM, Corp. 2010
   5  *
   6  * Authors:
   7  *  Harsh Prateek Bora <harsh@linux.vnet.ibm.com>
   8  *  Venkateswararao Jujjuri(JV) <jvrao@linux.vnet.ibm.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2.  See
  11  * the COPYING file in the top-level directory.
  12  *
  13  */
  14
  15 #include "fsdev/qemu-fsdev.h"
  16 #include "qemu/thread.h"
  17 #include "qemu/event_notifier.h"
  18 #include "block/coroutine.h"
  19 #include "virtio-9p-coth.h"
  20
  21 /* v9fs glib thread pool */
  22 static V9fsThPool v9fs_pool;
  23
  24 void co_run_in_worker_bh(void *opaque)
  25 {
  26     Coroutine *co = opaque;
  27     g_thread_pool_push(v9fs_pool.pool, co, NULL);
  28 }
  29
  30 static void v9fs_qemu_process_req_done(EventNotifier *e)
  31 {
  32     Coroutine *co;
  33
  34     event_notifier_test_and_clear(e);
  35
  36     while ((co = g_async_queue_try_pop(v9fs_pool.completed)) != NULL) {
  37         qemu_coroutine_enter(co, NULL);
  38     }
  39 }
  40
  41 static void v9fs_thread_routine(gpointer data, gpointer user_data)
  42 {
  43     Coroutine *co = data;
  44
  45     qemu_coroutine_enter(co, NULL);
  46
  47     g_async_queue_push(v9fs_pool.completed, co);
  48
  49     event_notifier_set(&v9fs_pool.e);
  50 }
  51
  52 int v9fs_init_worker_threads(void)
  53 {
  54     int ret = 0;
  55     V9fsThPool *p = &v9fs_pool;
  56     sigset_t set, oldset;
  57
  58     sigfillset(&set);
  59     /* Leave signal handling to the iothread.  */
  60     pthread_sigmask(SIG_SETMASK, &set, &oldset);
  61
  62     p->pool = g_thread_pool_new(v9fs_thread_routine, p, -1, FALSE, NULL);
  63     if (!p->pool) {
  64         ret = -1;
  65         goto err_out;
  66     }
  67     p->completed = g_async_queue_new();
  68     if (!p->completed) {
  69         /*
  70          * We are going to terminate.
  71          * So don't worry about cleanup
  72          */
  73         ret = -1;
  74         goto err_out;
  75     }
  76     event_notifier_init(&p->e, 0);
  77
  78     event_notifier_set_handler(&p->e, v9fs_qemu_process_req_done);
  79 err_out:
  80     pthread_sigmask(SIG_SETMASK, &oldset, NULL);
  81     return ret;
  82 }