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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/handle_signals_state.h"
#include "mojo/system/waiter.h"
namespace mojo {
namespace system {
WaiterList::WaiterList() {
}
WaiterList::~WaiterList() {
DCHECK(waiters_.empty());
}
void WaiterList::AwakeWaitersForStateChange(const HandleSignalsState& state) {
for (WaiterInfoList::iterator it = waiters_.begin(); it != waiters_.end();
++it) {
if (state.satisfies(it->signals))
it->waiter->Awake(MOJO_RESULT_OK, it->context);
else if (!state.can_satisfy(it->signals))
it->waiter->Awake(MOJO_RESULT_FAILED_PRECONDITION, it->context);
}
}
void WaiterList::CancelAllWaiters() {
for (WaiterInfoList::iterator it = waiters_.begin(); it != waiters_.end();
++it) {
it->waiter->Awake(MOJO_RESULT_CANCELLED, it->context);
}
waiters_.clear();
}
void WaiterList::AddWaiter(Waiter* waiter,
MojoHandleSignals signals,
uint32_t context) {
waiters_.push_back(WaiterInfo(waiter, signals, context));
}
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
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