mirror of
https://github.com/classilla/tenfourfox.git
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83 lines
2.5 KiB
C++
83 lines
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GMPSharedMemManager_h_
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#define GMPSharedMemManager_h_
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#include "mozilla/ipc/Shmem.h"
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#include "nsTArray.h"
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namespace mozilla {
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namespace gmp {
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class GMPSharedMemManager;
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class GMPSharedMem
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{
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public:
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typedef enum {
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kGMPFrameData = 0,
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kGMPEncodedData,
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kGMPNumTypes
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} GMPMemoryClasses;
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// This is a heuristic - max of 10 free in the Child pool, plus those
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// in-use for the encoder and decoder at the given moment and not yet
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// returned to the parent pool (which is not included). If more than
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// this are needed, we presume the client has either crashed or hung
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// (perhaps temporarily).
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static const uint32_t kGMPBufLimit = 20;
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GMPSharedMem()
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{
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for (size_t i = 0; i < sizeof(mGmpAllocated)/sizeof(mGmpAllocated[0]); i++) {
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mGmpAllocated[i] = 0;
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}
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}
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virtual ~GMPSharedMem() {}
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// Parent and child impls will differ here
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virtual void CheckThread() = 0;
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protected:
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friend class GMPSharedMemManager;
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nsTArray<ipc::Shmem> mGmpFreelist[GMPSharedMem::kGMPNumTypes];
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uint32_t mGmpAllocated[GMPSharedMem::kGMPNumTypes];
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};
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class GMPSharedMemManager
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{
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public:
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explicit GMPSharedMemManager(GMPSharedMem *aData) : mData(aData) {}
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virtual ~GMPSharedMemManager() {}
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virtual bool MgrAllocShmem(GMPSharedMem::GMPMemoryClasses aClass, size_t aSize,
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ipc::Shmem::SharedMemory::SharedMemoryType aType,
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ipc::Shmem* aMem);
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virtual bool MgrDeallocShmem(GMPSharedMem::GMPMemoryClasses aClass, ipc::Shmem& aMem);
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// So we can know if data is "piling up" for the plugin - I.e. it's hung or crashed
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virtual uint32_t NumInUse(GMPSharedMem::GMPMemoryClasses aClass);
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// These have to be implemented using the AllocShmem/etc provided by the IPDL-generated interfaces,
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// so have the Parent/Child implement them.
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virtual bool Alloc(size_t aSize, ipc::Shmem::SharedMemory::SharedMemoryType aType, ipc::Shmem* aMem) = 0;
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virtual void Dealloc(ipc::Shmem& aMem) = 0;
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private:
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nsTArray<ipc::Shmem>& GetGmpFreelist(GMPSharedMem::GMPMemoryClasses aTypes)
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{
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return mData->mGmpFreelist[aTypes];
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}
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GMPSharedMem *mData;
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};
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} // namespace gmp
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} // namespace mozilla
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#endif // GMPSharedMemManager_h_
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