Initial in-process implementation of some Mojo primitives.

mojo/system/waiter_list.cc

Index: mojo/system/waiter_list.cc
diff --git a/mojo/system/waiter_list.cc b/mojo/system/waiter_list.cc
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+++ b/mojo/system/waiter_list.cc
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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 "mojo/system/waiter_list.h"
+
+#include "base/logging.h"
+#include "mojo/system/waiter.h"
+
+namespace mojo {
+namespace system {
+
+WaiterList::WaiterList() {
+}
+
+WaiterList::~WaiterList() {
+  DCHECK(waiters_.empty());
+}
+
+void WaiterList::AwakeWaitersForStateChange(MojoWaitFlags satisfied_flags,
+                                            MojoWaitFlags satisfiable_flags) {
+  for (WaiterInfoList::iterator it = waiters_.begin(); it != waiters_.end();
+       ++it) {
+    if (it->flags & satisfied_flags)
+      it->waiter->Awake(it->wake_result);
+    else if (!(it->flags & satisfiable_flags))
+      it->waiter->Awake(MOJO_RESULT_FAILED_PRECONDITION);
+  }
+}
+
+void WaiterList::CancelAllWaiters() {
+  for (WaiterInfoList::iterator it = waiters_.begin(); it != waiters_.end();
+       ++it) {
+    it->waiter->Awake(MOJO_RESULT_CANCELLED);
+  }
+  waiters_.clear();
+}
+
+void WaiterList::AddWaiter(Waiter* waiter,
+                           MojoWaitFlags flags,
+                           MojoResult wake_result) {
+  waiters_.push_back(WaiterInfo(waiter, flags, wake_result));
+}
+
+void WaiterList::RemoveWaiter(Waiter* waiter) {
+  // We allow a thread to wait on the same handle multiple times simultaneously,
+  // so we need to scan the entire list and remove all occurrences of |waiter|.
+  for (WaiterInfoList::iterator it = waiters_.begin(); it != waiters_.end();) {
+    WaiterInfoList::iterator maybe_delete = it;
+    ++it;
+    if (maybe_delete->waiter == waiter)
+      waiters_.erase(maybe_delete);
+  }
+}
+
+}  // namespace system
+}  // namespace mojo