зеркало из https://github.com/mozilla/gecko-dev.git
91 строка
3.3 KiB
C++
91 строка
3.3 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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#include "GMPSharedMemManager.h"
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#include "GMPMessageUtils.h"
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#include "mozilla/ipc/SharedMemory.h"
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#include "mozilla/StaticPtr.h"
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#include "mozilla/ClearOnShutdown.h"
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namespace mozilla::gmp {
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// Really one set of pools on each side of the plugin API.
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// YUV buffers go from Encoder parent to child; pool there, and then return
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// with Decoded() frames to the Decoder parent and goes into the parent pool.
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// Compressed (encoded) data goes from the Decoder parent to the child;
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// pool there, and then return with Encoded() frames and goes into the parent
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// pool.
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bool GMPSharedMemManager::MgrAllocShmem(
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GMPSharedMem::GMPMemoryClasses aClass, size_t aSize,
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ipc::Shmem::SharedMemory::SharedMemoryType aType, ipc::Shmem* aMem) {
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mData->CheckThread();
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// first look to see if we have a free buffer large enough
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for (uint32_t i = 0; i < GetGmpFreelist(aClass).Length(); i++) {
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MOZ_ASSERT(GetGmpFreelist(aClass)[i].IsWritable());
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if (aSize <= GetGmpFreelist(aClass)[i].Size<uint8_t>()) {
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*aMem = GetGmpFreelist(aClass)[i];
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GetGmpFreelist(aClass).RemoveElementAt(i);
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return true;
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}
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}
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// Didn't find a buffer free with enough space; allocate one
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size_t pagesize = ipc::SharedMemory::SystemPageSize();
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aSize = (aSize + (pagesize - 1)) & ~(pagesize - 1); // round up to page size
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bool retval = Alloc(aSize, aType, aMem);
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if (retval) {
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// The allocator (or NeedsShmem call) should never return less than we ask
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// for...
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MOZ_ASSERT(aMem->Size<uint8_t>() >= aSize);
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mData->mGmpAllocated[aClass]++;
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}
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return retval;
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}
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bool GMPSharedMemManager::MgrDeallocShmem(GMPSharedMem::GMPMemoryClasses aClass,
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ipc::Shmem& aMem) {
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mData->CheckThread();
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size_t size = aMem.Size<uint8_t>();
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// XXX Bug NNNNNNN Until we put better guards on ipc::shmem, verify we
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// weren't fed an shmem we already had.
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for (uint32_t i = 0; i < GetGmpFreelist(aClass).Length(); i++) {
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if (NS_WARN_IF(aMem == GetGmpFreelist(aClass)[i])) {
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// Safest to crash in this case; should never happen in normal
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// operation.
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MOZ_CRASH("Deallocating Shmem we already have in our cache!");
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// return true;
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}
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}
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// XXX This works; there are better pool algorithms. We need to avoid
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// "falling off a cliff" with too low a number
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if (GetGmpFreelist(aClass).Length() > 10) {
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Dealloc(std::move(GetGmpFreelist(aClass)[0]));
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GetGmpFreelist(aClass).RemoveElementAt(0);
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// The allocation numbers will be fubar on the Child!
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mData->mGmpAllocated[aClass]--;
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}
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for (uint32_t i = 0; i < GetGmpFreelist(aClass).Length(); i++) {
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MOZ_ASSERT(GetGmpFreelist(aClass)[i].IsWritable());
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if (size < GetGmpFreelist(aClass)[i].Size<uint8_t>()) {
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GetGmpFreelist(aClass).InsertElementAt(i, aMem);
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return true;
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}
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}
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GetGmpFreelist(aClass).AppendElement(aMem);
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return true;
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}
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uint32_t GMPSharedMemManager::NumInUse(GMPSharedMem::GMPMemoryClasses aClass) {
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return mData->mGmpAllocated[aClass] - GetGmpFreelist(aClass).Length();
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}
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} // namespace mozilla::gmp
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