Add qemu 2.4.0

[kvmfornfv.git] / qemu / hw / 9pfs / virtio-9p-coth.c

diff --git a/qemu/hw/9pfs/virtio-9p-coth.c b/qemu/hw/9pfs/virtio-9p-coth.c
new file mode 100644 (file)
index 0000000..8185c53
--- /dev/null
+++ b/qemu/hw/9pfs/virtio-9p-coth.c
@@ -0,0 +1,82 @@
+/*
+ * Virtio 9p backend
+ *
+ * Copyright IBM, Corp. 2010
+ *
+ * Authors:
+ *  Harsh Prateek Bora <harsh@linux.vnet.ibm.com>
+ *  Venkateswararao Jujjuri(JV) <jvrao@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "fsdev/qemu-fsdev.h"
+#include "qemu/thread.h"
+#include "qemu/event_notifier.h"
+#include "block/coroutine.h"
+#include "virtio-9p-coth.h"
+
+/* v9fs glib thread pool */
+static V9fsThPool v9fs_pool;
+
+void co_run_in_worker_bh(void *opaque)
+{
+    Coroutine *co = opaque;
+    g_thread_pool_push(v9fs_pool.pool, co, NULL);
+}
+
+static void v9fs_qemu_process_req_done(EventNotifier *e)
+{
+    Coroutine *co;
+
+    event_notifier_test_and_clear(e);
+
+    while ((co = g_async_queue_try_pop(v9fs_pool.completed)) != NULL) {
+        qemu_coroutine_enter(co, NULL);
+    }
+}
+
+static void v9fs_thread_routine(gpointer data, gpointer user_data)
+{
+    Coroutine *co = data;
+
+    qemu_coroutine_enter(co, NULL);
+
+    g_async_queue_push(v9fs_pool.completed, co);
+
+    event_notifier_set(&v9fs_pool.e);
+}
+
+int v9fs_init_worker_threads(void)
+{
+    int ret = 0;
+    V9fsThPool *p = &v9fs_pool;
+    sigset_t set, oldset;
+
+    sigfillset(&set);
+    /* Leave signal handling to the iothread.  */
+    pthread_sigmask(SIG_SETMASK, &set, &oldset);
+
+    p->pool = g_thread_pool_new(v9fs_thread_routine, p, -1, FALSE, NULL);
+    if (!p->pool) {
+        ret = -1;
+        goto err_out;
+    }
+    p->completed = g_async_queue_new();
+    if (!p->completed) {
+        /*
+         * We are going to terminate.
+         * So don't worry about cleanup
+         */
+        ret = -1;
+        goto err_out;
+    }
+    event_notifier_init(&p->e, 0);
+
+    event_notifier_set_handler(&p->e, v9fs_qemu_process_req_done);
+err_out:
+    pthread_sigmask(SIG_SETMASK, &oldset, NULL);
+    return ret;
+}