Use explicit synchronization for Wayland surfaces

This change adds the use of zwp_linux_explicit_synchronization_v1 to
attach a Sync FD fence on presented image submitted to the compositor.

The change introduces the wsi/synchronization.hpp header and
implementation of the synchronization primitives used by WSI
implementations. Currently only Vulkan fences and fences exportable to
Sync FD are supported.

Change-Id: Ic7d6b712cc8ae8d171f799af51a70be62585b8a1
Signed-off-by: Rosen Zhelev <rosen.zhelev@arm.com>

1 files changed, 88 insertions, 0 deletions

diff --git a/util/file_descriptor.hpp b/util/file_descriptor.hpp
new file mode 100644
index 0000000..870cfbb
--- /dev/null
+++ b/util/file_descriptor.hpp
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2021 Arm Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/**
+ * @file
+ *
+ * @brief Contains the defintions of file descriptor utilities.
+ */
+
+#pragma once
+
+#include <unistd.h>
+#include <utility>
+
+namespace util
+{
+
+/**
+ * Manages a POSIX file descriptor.
+ */
+class fd_owner
+{
+public:
+
+   fd_owner() = default;
+   fd_owner(int fd)
+    : fd_handle{ fd }
+   {
+   }
+
+   fd_owner(const fd_owner &) = delete;
+   fd_owner &operator=(const fd_owner &) = delete;
+
+   fd_owner(fd_owner &&rhs)
+   {
+      *this = std::move(rhs);
+   }
+
+   fd_owner &operator=(fd_owner &&rhs)
+   {
+      std::swap(fd_handle, rhs.fd_handle);
+      return *this;
+   }
+
+   ~fd_owner()
+   {
+      if (is_valid())
+      {
+         close(fd_handle);
+      }
+   }
+
+   int get()
+   {
+      return fd_handle;
+   }
+
+   bool is_valid()
+   {
+       return fd_handle >= 0;
+   }
+
+private:
+   int fd_handle{ -1 };
+};
+
+} /* namespace util */
\ No newline at end of file