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diff --git a/src/vkvg_sync_context_internal.h b/src/vkvg_sync_context_internal.h
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+/*
+ * Copyright (c) 2018-2022 Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
+ *
+ * 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.
+ */
+#ifndef VKVG_SYNC_CONTEXT_INTERNAL_H
+#define VKVG_SYNC_CONTEXT_INTERNAL_H
+
+#include "vkvg_internal.h"
+#include "vkvg.h"
+#include "vkh.h"
+
+typedef struct _vkvg_sync_context* vkvgSync;
+
+typedef struct _vkvg_sync_context {
+	VkvgDevice	dev;
+	VkFence		fence;			// this fence is kept signaled when idle, wait and reset are called before each recording.
+	VkSemaphore signals[2];		// dual signal semaphore couple with the fence guard ensure sync in multithreaded.
+	bool		nextSubmIdx;	// switch between signal[0] and [1], index of the next sema to use as signal
+
+	vkvgSync	awaitedBy;
+	vkvgSync	awaiting;
+}vkvg_sync_context;
+
+void	_sync_context_init				(VkvgDevice dev, vkvg_sync_context* ctx);
+void	_sync_context_clear				(vkvgSync ctx);
+VkResult _sync_context_wait				(vkvgSync ctx, uint64_t timeout);
+VkResult _sync_context_wait_and_reset	(vkvgSync ctx, uint64_t timeout);
+
+void _sync_context_dbg_print (const char *label, vkvg_sync_context* ctx);
+#endif