93 lines
2.6 KiB
C++
93 lines
2.6 KiB
C++
/*
|
|
Copyright (c) 2009-2010 Christopher A. Taylor. All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are met:
|
|
|
|
* Redistributions of source code must retain the above copyright notice,
|
|
this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above copyright notice,
|
|
this list of conditions and the following disclaimer in the documentation
|
|
and/or other materials provided with the distribution.
|
|
* Neither the name of LibCat nor the names of its contributors may be used
|
|
to endorse or promote products derived from this software without
|
|
specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef CAT_WAITABLE_FLAG_HPP
|
|
#define CAT_WAITABLE_FLAG_HPP
|
|
|
|
#include <cat/Platform.hpp>
|
|
|
|
#if defined(CAT_OS_WINDOWS)
|
|
# include <cat/port/WindowsInclude.hpp>
|
|
#else // use POSIX thread library otherwise
|
|
# include <pthread.h>
|
|
#endif
|
|
|
|
namespace cat {
|
|
|
|
|
|
/*
|
|
class WaitableFlag
|
|
|
|
Can be set, reset or waited upon.
|
|
|
|
Initially unset.
|
|
Flag is edge-triggered.
|
|
Successful waiting will reset the flag.
|
|
Only one thread can wait at a time.
|
|
|
|
Designed to synchronize threads:
|
|
One thread can wait for this flag to be raised by another thread before continuing.
|
|
*/
|
|
class WaitableFlag
|
|
{
|
|
#if defined(CAT_OS_WINDOWS)
|
|
HANDLE _event;
|
|
#else
|
|
bool _valid, _valid_cond, _valid_mutex;
|
|
volatile u32 _flag;
|
|
pthread_cond_t _cond;
|
|
pthread_mutex_t _mutex;
|
|
#endif
|
|
|
|
void Cleanup();
|
|
|
|
public:
|
|
WaitableFlag();
|
|
CAT_INLINE virtual ~WaitableFlag()
|
|
{
|
|
Cleanup();
|
|
}
|
|
|
|
CAT_INLINE bool Valid()
|
|
{
|
|
#if defined(CAT_OS_WINDOWS)
|
|
return _event != 0;
|
|
#else
|
|
return _valid;
|
|
#endif
|
|
}
|
|
|
|
bool Set();
|
|
bool Wait(int milliseconds = -1); // < 0 = wait forever
|
|
};
|
|
|
|
|
|
} // namespace cat
|
|
|
|
#endif // CAT_WAITABLE_FLAG_HPP
|