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