95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
// Filename: conditionVarSimpleImpl.cxx
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// Created by: drose (19Jun07)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) Carnegie Mellon University. All rights reserved.
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//
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// All use of this software is subject to the terms of the revised BSD
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// license. You should have received a copy of this license along
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// with this source code in a file named "LICENSE."
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//
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////////////////////////////////////////////////////////////////////
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#include "selectThreadImpl.h"
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#ifdef THREAD_SIMPLE_IMPL
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#include "conditionVarSimpleImpl.h"
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#include "threadSimpleImpl.h"
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////////////////////////////////////////////////////////////////////
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// Function: ConditionVarSimpleImpl::wait
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// Access: Public
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// Description:
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////////////////////////////////////////////////////////////////////
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void ConditionVarSimpleImpl::
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wait() {
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_mutex.release_quietly();
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ThreadSimpleManager *manager = ThreadSimpleManager::get_global_ptr();
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ThreadSimpleImpl *thread = manager->get_current_thread();
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manager->enqueue_block(thread, this);
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manager->next_context();
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_mutex.acquire();
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}
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////////////////////////////////////////////////////////////////////
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// Function: ConditionVarSimpleImpl::wait
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// Access: Public
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// Description:
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////////////////////////////////////////////////////////////////////
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void ConditionVarSimpleImpl::
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wait(double timeout) {
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_mutex.release_quietly();
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// TODO. For now this will release every frame, since we don't have
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// an interface yet on ThreadSimpleManager to do a timed wait.
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// Maybe that's good enough forever (it does satisfy the condition
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// variable semantics, after all).
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ThreadSimpleManager *manager = ThreadSimpleManager::get_global_ptr();
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ThreadSimpleImpl *thread = manager->get_current_thread();
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manager->enqueue_ready(thread, true);
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manager->next_context();
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_mutex.acquire();
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}
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////////////////////////////////////////////////////////////////////
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// Function: ConditionVarSimpleImpl::do_notify
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// Access: Private
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// Description:
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////////////////////////////////////////////////////////////////////
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void ConditionVarSimpleImpl::
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do_notify() {
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ThreadSimpleManager *manager = ThreadSimpleManager::get_global_ptr();
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if (manager->unblock_one(this)) {
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// There had been a thread waiting on this condition variable.
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// Switch contexts immediately, to make fairness more likely.
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ThreadSimpleImpl *thread = manager->get_current_thread();
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manager->enqueue_ready(thread, false);
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manager->next_context();
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}
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}
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////////////////////////////////////////////////////////////////////
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// Function: ConditionVarSimpleImpl::do_notify_all
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// Access: Private
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// Description:
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////////////////////////////////////////////////////////////////////
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void ConditionVarSimpleImpl::
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do_notify_all() {
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ThreadSimpleManager *manager = ThreadSimpleManager::get_global_ptr();
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if (manager->unblock_all(this)) {
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// There had been a thread waiting on this condition variable.
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// Switch contexts immediately, to make fairness more likely.
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ThreadSimpleImpl *thread = manager->get_current_thread();
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manager->enqueue_ready(thread, false);
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manager->next_context();
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}
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}
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#endif // THREAD_SIMPLE_IMPL
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