1 // Copyright 2013 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "mojo/system/waiter_list.h"
6
7 #include "base/logging.h"
8 #include "mojo/system/handle_signals_state.h"
9 #include "mojo/system/waiter.h"
10
11 namespace mojo {
12 namespace system {
13
WaiterList()14 WaiterList::WaiterList() {
15 }
16
~WaiterList()17 WaiterList::~WaiterList() {
18 DCHECK(waiters_.empty());
19 }
20
AwakeWaitersForStateChange(const HandleSignalsState & state)21 void WaiterList::AwakeWaitersForStateChange(const HandleSignalsState& state) {
22 for (WaiterInfoList::iterator it = waiters_.begin(); it != waiters_.end();
23 ++it) {
24 if (state.satisfies(it->signals))
25 it->waiter->Awake(MOJO_RESULT_OK, it->context);
26 else if (!state.can_satisfy(it->signals))
27 it->waiter->Awake(MOJO_RESULT_FAILED_PRECONDITION, it->context);
28 }
29 }
30
CancelAllWaiters()31 void WaiterList::CancelAllWaiters() {
32 for (WaiterInfoList::iterator it = waiters_.begin(); it != waiters_.end();
33 ++it) {
34 it->waiter->Awake(MOJO_RESULT_CANCELLED, it->context);
35 }
36 waiters_.clear();
37 }
38
AddWaiter(Waiter * waiter,MojoHandleSignals signals,uint32_t context)39 void WaiterList::AddWaiter(Waiter* waiter,
40 MojoHandleSignals signals,
41 uint32_t context) {
42 waiters_.push_back(WaiterInfo(waiter, signals, context));
43 }
44
RemoveWaiter(Waiter * waiter)45 void WaiterList::RemoveWaiter(Waiter* waiter) {
46 // We allow a thread to wait on the same handle multiple times simultaneously,
47 // so we need to scan the entire list and remove all occurrences of |waiter|.
48 for (WaiterInfoList::iterator it = waiters_.begin(); it != waiters_.end();) {
49 WaiterInfoList::iterator maybe_delete = it;
50 ++it;
51 if (maybe_delete->waiter == waiter)
52 waiters_.erase(maybe_delete);
53 }
54 }
55
56 } // namespace system
57 } // namespace mojo
58