100 lines
2.4 KiB
C++
100 lines
2.4 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/posix/global_descriptors.h"
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#include <vector>
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#include <utility>
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#include "base/logging.h"
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namespace base {
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GlobalDescriptors::Descriptor::Descriptor(Key key, int fd)
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: key(key), fd(fd), region(base::MemoryMappedFile::Region::kWholeFile) {
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}
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GlobalDescriptors::Descriptor::Descriptor(Key key,
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int fd,
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base::MemoryMappedFile::Region region)
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: key(key), fd(fd), region(region) {
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}
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// static
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GlobalDescriptors* GlobalDescriptors::GetInstance() {
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typedef Singleton<base::GlobalDescriptors,
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LeakySingletonTraits<base::GlobalDescriptors> >
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GlobalDescriptorsSingleton;
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return GlobalDescriptorsSingleton::get();
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}
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int GlobalDescriptors::Get(Key key) const {
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const int ret = MaybeGet(key);
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if (ret == -1)
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DLOG(DCHECK) << "Unknown global descriptor: " << key;
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return ret;
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}
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int GlobalDescriptors::MaybeGet(Key key) const {
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for (const auto& i : descriptors_) {
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if (i.key == key)
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return i.fd;
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}
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return -1;
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}
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base::ScopedFD GlobalDescriptors::TakeFD(
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Key key,
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base::MemoryMappedFile::Region* region) {
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base::ScopedFD fd;
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for (auto i = descriptors_.begin(); i != descriptors_.end(); ++i) {
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if (i->key == key) {
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*region = i->region;
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fd.reset(i->fd);
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descriptors_.erase(i);
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break;
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}
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}
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return fd;
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}
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void GlobalDescriptors::Set(Key key, int fd) {
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Set(key, fd, base::MemoryMappedFile::Region::kWholeFile);
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}
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void GlobalDescriptors::Set(Key key,
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int fd,
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base::MemoryMappedFile::Region region) {
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for (auto& i : descriptors_) {
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if (i.key == key) {
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i.fd = fd;
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i.region = region;
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return;
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}
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}
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descriptors_.push_back(Descriptor(key, fd, region));
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}
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base::MemoryMappedFile::Region GlobalDescriptors::GetRegion(Key key) const {
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for (const auto& i : descriptors_) {
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if (i.key == key)
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return i.region;
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}
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DLOG(DCHECK) << "Unknown global descriptor: " << key;
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return base::MemoryMappedFile::Region::kWholeFile;
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}
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void GlobalDescriptors::Reset(const Mapping& mapping) {
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descriptors_ = mapping;
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}
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GlobalDescriptors::GlobalDescriptors() = default;
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GlobalDescriptors::~GlobalDescriptors() = default;
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} // namespace base
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