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113 lines
4.0 KiB
113 lines
4.0 KiB
/*
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* Copyright (c) 2019-2020, The Linux Foundation. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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* * Neither the name of The Linux Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
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* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
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* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __FENCE_H__
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#define __FENCE_H__
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#include <core/buffer_sync_handler.h>
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#include <unistd.h>
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#include <utility>
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#include <memory>
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#include <string>
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#include <vector>
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namespace sdm {
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using std::shared_ptr;
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using std::string;
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using std::to_string;
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class Fence {
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public:
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enum class Status : int32_t {
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kSignaled = 0,
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kPending
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};
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// This class methods allow client to get access to the native file descriptor of fence object
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// during the scope of this class object. Underlying file descriptor is duped and returned to
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// the client. Duped file descriptors are closed as soon as scope ends. Client can get access
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// to multiple fences using the same scoped reference.
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class ScopedRef {
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public:
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~ScopedRef();
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int Get(const shared_ptr<Fence> &fence);
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private:
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std::vector<int> dup_fds_ = {};
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};
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~Fence();
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// Must be set once before using any other method of this class.
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static void Set(BufferSyncHandler *buffer_sync_handler);
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// Ownership of the file descriptor is transferred to this method.
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// Client must not close the file descriptor anymore regardless of the object creation status.
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// nullptr will be retured for invalid fd i.e. -1.
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static shared_ptr<Fence> Create(int fd, const string &name);
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// Ownership of returned fd lies with caller. Caller must explicitly close the fd.
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static int Dup(const shared_ptr<Fence> &fence);
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static shared_ptr<Fence> Merge(const shared_ptr<Fence> &fence1, const shared_ptr<Fence> &fence2);
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static shared_ptr<Fence> Merge(const std::vector<shared_ptr<Fence>> &fences,
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bool ignore_signaled);
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// Wait on null fence will return success.
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static DisplayError Wait(const shared_ptr<Fence> &fence);
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static DisplayError Wait(const shared_ptr<Fence> &fence, int timeout);
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// Status check on null fence will return signaled.
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static Status GetStatus(const shared_ptr<Fence> &fence);
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static string GetStr(const shared_ptr<Fence> &fence);
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// Write all fences info to the output stream.
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static void Dump(std::ostringstream *os);
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private:
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explicit Fence(int fd, const string &name);
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Fence(const Fence &fence) = delete;
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Fence& operator=(const Fence &fence) = delete;
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Fence(Fence &&fence) = delete;
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Fence& operator=(Fence &&fence) = delete;
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static int Get(const shared_ptr<Fence> &fence);
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static BufferSyncHandler *g_buffer_sync_handler_;
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static std::vector<std::weak_ptr<Fence>> wps_;
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int fd_ = -1;
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string name_ = "";
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};
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} // namespace sdm
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#endif // __FENCE_H__
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