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// Copyright 2019 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef VK_SEMAPHORE_EXTERNAL_FUCHSIA_H_
#define VK_SEMAPHORE_EXTERNAL_FUCHSIA_H_
#include "System/Debug.hpp"
#include <zircon/syscalls.h>
// An external semaphore implementation for the Zircon kernel using a simple
// Zircon event handle. This matches
// VK_EXTERNAL_SEMAPHORE_HANDLE_TYPE_TEMP_ZIRCON_EVENT_BIT_FUCHSIA
// which is not official yet but used by Fuchsia at the moment.
namespace vk {
class ZirconEventExternalSemaphore : public Semaphore::External
{
public:
~ZirconEventExternalSemaphore()
{
zx_handle_close(handle);
}
VkResult init(bool initialValue) override
{
zx_status_t status = zx_event_create(0, &handle);
if(status != ZX_OK)
{
TRACE("zx_event_create() returned %d", status);
return VK_ERROR_INITIALIZATION_FAILED;
}
if(initialValue)
{
status = zx_object_signal(handle, 0, ZX_EVENT_SIGNALED);
if(status != ZX_OK)
{
TRACE("zx_object_signal() returned %d", status);
zx_handle_close(handle);
handle = ZX_HANDLE_INVALID;
return VK_ERROR_INITIALIZATION_FAILED;
}
}
return VK_SUCCESS;
}
VkResult importHandle(zx_handle_t new_handle) override
{
zx_handle_close(handle);
handle = new_handle;
return VK_SUCCESS;
}
VkResult exportHandle(zx_handle_t *pHandle) override
{
zx_handle_t new_handle = ZX_HANDLE_INVALID;
zx_status_t status = zx_handle_duplicate(handle, ZX_RIGHT_SAME_RIGHTS, &new_handle);
if(status != ZX_OK)
{
DABORT("zx_handle_duplicate() returned %d", status);
return VK_ERROR_INVALID_EXTERNAL_HANDLE;
}
*pHandle = new_handle;
return VK_SUCCESS;
}
void wait() override
{
zx_signals_t observed = 0;
zx_status_t status = zx_object_wait_one(
handle, ZX_EVENT_SIGNALED, ZX_TIME_INFINITE, &observed);
if(status != ZX_OK)
{
DABORT("zx_object_wait_one() returned %d", status);
return;
}
if(observed != ZX_EVENT_SIGNALED)
{
DABORT("zx_object_wait_one() returned observed %x (%x expected)", observed, ZX_EVENT_SIGNALED);
return;
}
// Need to unsignal the event now, as required by the Vulkan spec.
status = zx_object_signal(handle, ZX_EVENT_SIGNALED, 0);
if(status != ZX_OK)
{
DABORT("zx_object_signal() returned %d", status);
return;
}
}
bool tryWait() override
{
zx_signals_t observed = 0;
zx_status_t status = zx_object_wait_one(
handle, ZX_EVENT_SIGNALED, zx_clock_get_monotonic(), &observed);
if(status != ZX_OK && status != ZX_ERR_TIMED_OUT)
{
DABORT("zx_object_wait_one() returned %d", status);
return false;
}
if(observed != ZX_EVENT_SIGNALED)
{
return false;
}
// Need to unsignal the event now, as required by the Vulkan spec.
status = zx_object_signal(handle, ZX_EVENT_SIGNALED, 0);
if(status != ZX_OK)
{
DABORT("zx_object_signal() returned %d", status);
return false;
}
return true;
}
void signal() override
{
zx_status_t status = zx_object_signal(handle, 0, ZX_EVENT_SIGNALED);
if(status != ZX_OK)
{
DABORT("zx_object_signal() returned %d", status);
}
}
private:
zx_handle_t handle = ZX_HANDLE_INVALID;
};
} // namespace vk
#endif // VK_SEMAPHORE_EXTERNAL_FUCHSIA_H_