86 lines
2.2 KiB
C++
86 lines
2.2 KiB
C++
/**
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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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* @file conditionVarSimpleImpl.cxx
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* @author drose
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* @date 2007-06-19
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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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*
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*/
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void ConditionVarSimpleImpl::
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wait() {
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_mutex.unlock_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.lock();
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}
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/**
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*
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*/
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void ConditionVarSimpleImpl::
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wait(double timeout) {
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_mutex.unlock_quietly();
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// TODO. For now this will release every frame, since we don't have an
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// interface yet on ThreadSimpleManager to do a timed wait. Maybe that's
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// good enough forever (it does satisfy the condition variable semantics,
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// 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.lock();
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}
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/**
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*
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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. Switch
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// 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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*
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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. Switch
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// 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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