Make tcp_client_socket_unittest pass on Linux....

base/message_pump_libevent.cc

+// Copyright (c) 2006-2008 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/message_pump_libevent.h"
+#include "base/logging.h"
+#include "base/time.h"
+
+#include "third_party/libevent/event.h"
+
+// Called if a byte is received on the wakeup pipe
+extern "C" void MessagePumpLibevent_wakeup(int socket, short flags, void *context) {
+  base::MessagePumpLibevent* that = static_cast<base::MessagePumpLibevent*>(context);
+  DCHECK(that->wakeup_pipe_gazouta_ == socket);
+
+  // remove and discard the wakeup byte 
+  char buf;
+  int nread = read(socket, &buf, 1);
+  DCHECK(nread == 1);
+  // tell libevent to break out of inner loop
+  event_base_loopbreak(that->evbase_);
+}
+
+namespace base {
+
+MessagePumpLibevent::MessagePumpLibevent()
+    : keep_running_(true) {
+  evbase_ = event_base_new();
+  wakeup_event_ = new event;
+
+  // Dang, too much real work in the constructor.
+  int fds[2];
+  int err = pipe(fds);
+  DCHECK(!err);
+  if (err) {
+    wakeup_pipe_gazinta_ = -1;
+    wakeup_pipe_gazouta_ = -1;
+    memset(wakeup_event_, 0, sizeof(*wakeup_event_));
+  } else {
+    wakeup_pipe_gazouta_ = fds[0];
+    wakeup_pipe_gazinta_ = fds[1];
+    event_set(wakeup_event_, wakeup_pipe_gazouta_,
+              EV_READ | EV_PERSIST, MessagePumpLibevent_wakeup, this);
+    event_base_set(evbase_, wakeup_event_);
+
+    if (event_add(wakeup_event_, 0) == -1) {
+        DCHECK(0);
+        // Did I mention this was too much real work in the constructor?
+    }
+  }
+}
+
+MessagePumpLibevent::~MessagePumpLibevent() {
+  DCHECK(wakeup_event_);
+  DCHECK(evbase_);
+  event_del(wakeup_event_);
+  delete wakeup_event_;
+  wakeup_event_ = 0;
+  event_base_free(evbase_);
+  evbase_ = 0;
+}
+
+void MessagePumpLibevent::Run(Delegate* delegate) {
+  DCHECK(keep_running_) << "Quit must have been called outside of Run!";
+
+  for (;;) {
+    bool did_work = delegate->DoWork();
+    if (!keep_running_)
+      break;
+
+    did_work |= delegate->DoDelayedWork(&delayed_work_time_);
+    if (!keep_running_)
+      break;
+
+    if (did_work)
+      continue;
+
+    did_work = delegate->DoIdleWork();
+    if (!keep_running_)
+      break;
+
+    if (did_work)
+      continue;
+
+    // 50 wakeups per second sucks, but without this, tests take a long time or hang.
+    int poll_ms = 20;
+    if (!delayed_work_time_.is_null()) {
+      TimeDelta delay = delayed_work_time_ - Time::Now();
+      if (delay > TimeDelta()) {
+        int delay_ms = delay.InMilliseconds();
+        if (delay_ms < poll_ms)
+          poll_ms = delay_ms;
+      } else {
+        // It looks like delayed_work_time_ indicates a time in the past, so we
+        // need to call DoDelayedWork now.
+        delayed_work_time_ = Time();
+      }
+    }
+    struct timeval poll_tv;
+    poll_tv.tv_sec = 0;
+    poll_tv.tv_usec = poll_ms * 1000;
+    event_base_loopexit(evbase_, &poll_tv);
+    event_base_loop(evbase_, 0);
+  }
+
+  keep_running_ = true;
+}
+
+void MessagePumpLibevent::Quit() {
+  ScheduleWork();
+  keep_running_ = false;
+}
+
+void MessagePumpLibevent::ScheduleWork() {
+  // This can be called on any thread.
+  // Tell libevent (in a threadsafe way) that it should break out of its loop.
+  char buf = 0;
+  int nwrite = write(wakeup_pipe_gazinta_, &buf, 1);
+  DCHECK(nwrite == 1);
+}
+
+void MessagePumpLibevent::ScheduleDelayedWork(const Time& delayed_work_time) {
+  // We know that we can't be blocked on Wait right now since this method can
+  // only be called on the same thread as Run, so we only need to update our
+  // record of how long to sleep when we do sleep.
+  delayed_work_time_ = delayed_work_time;
+}
+
+}  // namespace base
+