74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
// Filename: mutexSimpleImpl.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 "mutexSimpleImpl.h"
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#include "threadSimpleImpl.h"
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#include "threadSimpleManager.h"
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////////////////////////////////////////////////////////////////////
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// Function: MutexSimpleImpl::do_acquire
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// Access: Private
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// Description:
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////////////////////////////////////////////////////////////////////
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void MutexSimpleImpl::
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do_acquire() {
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// By the time we get here, we already know that someone else is
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// holding the lock: (_flags & F_lock_count) != 0.
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ThreadSimpleManager *manager = ThreadSimpleManager::get_global_ptr();
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ThreadSimpleImpl *thread = manager->get_current_thread();
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while ((_flags & F_lock_count) != 0) {
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manager->enqueue_block(thread, this);
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manager->next_context();
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}
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_flags |= F_lock_count;
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}
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////////////////////////////////////////////////////////////////////
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// Function: MutexSimpleImpl::do_release
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// Access: Private
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// Description:
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////////////////////////////////////////////////////////////////////
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void MutexSimpleImpl::
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do_release() {
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// By the time we get here, we already know that someone else is
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// blocked on this mutex: (_flags & F_waiters) != 0.
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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 mutex. Switch contexts
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// 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: MutexSimpleImpl::do_release_quietly
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// Access: Private
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// Description:
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////////////////////////////////////////////////////////////////////
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void MutexSimpleImpl::
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do_release_quietly() {
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ThreadSimpleManager *manager = ThreadSimpleManager::get_global_ptr();
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manager->unblock_one(this);
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}
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#endif // THREAD_SIMPLE_IMPL
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