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base/file_descriptor_store.cc

Index: base/file_descriptor_store.cc
diff --git a/base/file_descriptor_store.cc b/base/file_descriptor_store.cc
new file mode 100644
index 0000000000000000000000000000000000000000..74a55df6b4e844a658cbceec2c5b0817ed54aee1
--- /dev/null
+++ b/base/file_descriptor_store.cc
@@ -0,0 +1,81 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/file_descriptor_store.h"
+
+#include <utility>
+
+#include "base/logging.h"
+
+namespace base {
+
+FileDescriptorStore::Descriptor::Descriptor(const std::string& key,
+                                            base::ScopedFD fd)
+    : key(key),
+      fd(std::move(fd)),
+      region(base::MemoryMappedFile::Region::kWholeFile) {}
+
+FileDescriptorStore::Descriptor::Descriptor(
+    const std::string& key,
+    base::ScopedFD fd,
+    base::MemoryMappedFile::Region region)
+    : key(key), fd(std::move(fd)), region(region) {}
+
+FileDescriptorStore::Descriptor::Descriptor(
+    FileDescriptorStore::Descriptor&& other)
+    : key(other.key), fd(std::move(other.fd)), region(other.region) {}
+
+FileDescriptorStore::Descriptor::~Descriptor() {}
+
+FileDescriptorStore::Descriptor& FileDescriptorStore::Descriptor::operator=(
+    FileDescriptorStore::Descriptor&& other) {
+  key = other.key;
+  fd = std::move(other.fd);
+  region = other.region;
+  return *this;
+}
+
+// static
+FileDescriptorStore& FileDescriptorStore::GetInstance() {
+  static FileDescriptorStore* store = new FileDescriptorStore;
+  return *store;
+}
+
+base::ScopedFD FileDescriptorStore::TakeFD(
+    const std::string& key,
+    base::MemoryMappedFile::Region* region) {
+  base::ScopedFD fd = MaybeTakeFD(key, region);
+  if (!fd.is_valid())
+    DLOG(FATAL) << "Unknown global descriptor: " << key;
+  return fd;
+}
+
+base::ScopedFD FileDescriptorStore::MaybeTakeFD(
+    const std::string& key,
+    base::MemoryMappedFile::Region* region) {
+  auto iter = descriptors_.find(key);
+  if (iter == descriptors_.end())
+    return base::ScopedFD();
+  descriptors_.erase(iter);
+  if (region)
+    *region = iter->second.region;
+  return std::move(iter->second.fd);
+}
+
+void FileDescriptorStore::Set(const std::string& key, base::ScopedFD fd) {
+  Set(key, std::move(fd), base::MemoryMappedFile::Region::kWholeFile);
+}
+
+void FileDescriptorStore::Set(const std::string& key,
+                              base::ScopedFD fd,
+                              base::MemoryMappedFile::Region region) {
+  Descriptor descriptor(key, std::move(fd), region);
+  descriptors_.insert(std::make_pair(key, std::move(descriptor)));
+}
+
+FileDescriptorStore::FileDescriptorStore() {}
+
+FileDescriptorStore::~FileDescriptorStore() {}
+
+}  // namespace base