Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 54 insertions, 0 deletions

diff --git a/util/qemu-thread-common.h b/util/qemu-thread-common.h
new file mode 100644
index 000000000..2af6b1208
--- /dev/null
+++ b/util/qemu-thread-common.h
@@ -0,0 +1,54 @@
+/*
+ * Common qemu-thread implementation header file.
+ *
+ * Copyright Red Hat, Inc. 2018
+ *
+ * Authors:
+ *  Peter Xu <peterx@redhat.com>,
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef QEMU_THREAD_COMMON_H
+#define QEMU_THREAD_COMMON_H
+
+#include "qemu/thread.h"
+#include "trace.h"
+
+static inline void qemu_mutex_post_init(QemuMutex *mutex)
+{
+#ifdef CONFIG_DEBUG_MUTEX
+    mutex->file = NULL;
+    mutex->line = 0;
+#endif
+    mutex->initialized = true;
+}
+
+static inline void qemu_mutex_pre_lock(QemuMutex *mutex,
+                                       const char *file, int line)
+{
+    trace_qemu_mutex_lock(mutex, file, line);
+}
+
+static inline void qemu_mutex_post_lock(QemuMutex *mutex,
+                                        const char *file, int line)
+{
+#ifdef CONFIG_DEBUG_MUTEX
+    mutex->file = file;
+    mutex->line = line;
+#endif
+    trace_qemu_mutex_locked(mutex, file, line);
+}
+
+static inline void qemu_mutex_pre_unlock(QemuMutex *mutex,
+                                         const char *file, int line)
+{
+#ifdef CONFIG_DEBUG_MUTEX
+    mutex->file = NULL;
+    mutex->line = 0;
+#endif
+    trace_qemu_mutex_unlock(mutex, file, line);
+}
+
+#endif