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// Copyright 2013 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 "tools/android/forwarder2/forwarders_manager.h"
#include <stddef.h>
#include <sys/select.h>
#include <unistd.h>
#include <algorithm>
#include <utility>
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/posix/eintr_wrapper.h"
#include "tools/android/forwarder2/forwarder.h"
#include "tools/android/forwarder2/socket.h"
namespace forwarder2 {
ForwardersManager::ForwardersManager() : thread_("ForwardersManagerThread") {
thread_.Start();
WaitForEventsOnInternalThreadSoon();
}
ForwardersManager::~ForwardersManager() {
deletion_notifier_.Notify();
}
void ForwardersManager::CreateAndStartNewForwarder(scoped_ptr<Socket> socket1,
scoped_ptr<Socket> socket2) {
// Note that the internal Forwarder vector is populated on the internal thread
// which is the only thread from which it's accessed.
thread_.task_runner()->PostTask(
FROM_HERE,
base::Bind(&ForwardersManager::CreateNewForwarderOnInternalThread,
base::Unretained(this), base::Passed(&socket1),
base::Passed(&socket2)));
// Guarantees that the CreateNewForwarderOnInternalThread callback posted to
// the internal thread gets executed immediately.
wakeup_notifier_.Notify();
}
void ForwardersManager::CreateNewForwarderOnInternalThread(
scoped_ptr<Socket> socket1,
scoped_ptr<Socket> socket2) {
DCHECK(thread_.task_runner()->RunsTasksOnCurrentThread());
forwarders_.push_back(new Forwarder(std::move(socket1), std::move(socket2)));
}
void ForwardersManager::WaitForEventsOnInternalThreadSoon() {
thread_.task_runner()->PostTask(
FROM_HERE,
base::Bind(&ForwardersManager::WaitForEventsOnInternalThread,
base::Unretained(this)));
}
void ForwardersManager::WaitForEventsOnInternalThread() {
DCHECK(thread_.task_runner()->RunsTasksOnCurrentThread());
fd_set read_fds;
fd_set write_fds;
FD_ZERO(&read_fds);
FD_ZERO(&write_fds);
// Populate the file descriptor sets.
int max_fd = -1;
for (ScopedVector<Forwarder>::iterator it = forwarders_.begin();
it != forwarders_.end(); ++it) {
Forwarder* const forwarder = *it;
forwarder->RegisterFDs(&read_fds, &write_fds, &max_fd);
}
const int notifier_fds[] = {
wakeup_notifier_.receiver_fd(),
deletion_notifier_.receiver_fd(),
};
for (size_t i = 0; i < arraysize(notifier_fds); ++i) {
const int notifier_fd = notifier_fds[i];
DCHECK_GT(notifier_fd, -1);
FD_SET(notifier_fd, &read_fds);
max_fd = std::max(max_fd, notifier_fd);
}
const int ret = HANDLE_EINTR(
select(max_fd + 1, &read_fds, &write_fds, NULL, NULL));
if (ret < 0) {
PLOG(ERROR) << "select";
return;
}
const bool must_shutdown = FD_ISSET(
deletion_notifier_.receiver_fd(), &read_fds);
if (must_shutdown && forwarders_.empty())
return;
base::ScopedClosureRunner wait_for_events_soon(
base::Bind(&ForwardersManager::WaitForEventsOnInternalThreadSoon,
base::Unretained(this)));
if (FD_ISSET(wakeup_notifier_.receiver_fd(), &read_fds)) {
// Note that the events on FDs other than the wakeup notifier one, if any,
// will be processed upon the next select().
wakeup_notifier_.Reset();
return;
}
// Notify the Forwarder instances and remove the ones that are closed.
for (size_t i = 0; i < forwarders_.size(); ) {
Forwarder* const forwarder = forwarders_[i];
forwarder->ProcessEvents(read_fds, write_fds);
if (must_shutdown)
forwarder->Shutdown();
if (!forwarder->IsClosed()) {
++i;
continue;
}
std::swap(forwarders_[i], forwarders_.back());
forwarders_.pop_back();
}
}
} // namespace forwarder2
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