mirror of
https://github.com/opencv/opencv.git
synced 2024-12-23 16:08:00 +08:00
104 lines
2.9 KiB
C++
104 lines
2.9 KiB
C++
///////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Copyright (c) 2005, Industrial Light & Magic, a division of Lucas
|
|
// Digital Ltd. LLC
|
|
//
|
|
// 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 Industrial Light & Magic 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
|
|
// OWNER 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.
|
|
//
|
|
///////////////////////////////////////////////////////////////////////////
|
|
|
|
//-----------------------------------------------------------------------------
|
|
//
|
|
// class Semaphore -- implementation for platforms
|
|
// that support Posix threads and Posix semaphores
|
|
//
|
|
//-----------------------------------------------------------------------------
|
|
|
|
#include "IlmBaseConfig.h"
|
|
|
|
#if HAVE_PTHREAD && HAVE_POSIX_SEMAPHORES
|
|
|
|
#include "IlmThreadSemaphore.h"
|
|
#include "Iex.h"
|
|
#include <assert.h>
|
|
|
|
namespace IlmThread {
|
|
|
|
|
|
Semaphore::Semaphore (unsigned int value)
|
|
{
|
|
if (::sem_init (&_semaphore, 0, value))
|
|
Iex::throwErrnoExc ("Cannot initialize semaphore (%T).");
|
|
}
|
|
|
|
|
|
Semaphore::~Semaphore ()
|
|
{
|
|
int error = ::sem_destroy (&_semaphore);
|
|
assert (error == 0);
|
|
}
|
|
|
|
|
|
void
|
|
Semaphore::wait ()
|
|
{
|
|
::sem_wait (&_semaphore);
|
|
}
|
|
|
|
|
|
bool
|
|
Semaphore::tryWait ()
|
|
{
|
|
return sem_trywait (&_semaphore) == 0;
|
|
}
|
|
|
|
|
|
void
|
|
Semaphore::post ()
|
|
{
|
|
if (::sem_post (&_semaphore))
|
|
Iex::throwErrnoExc ("Post operation on semaphore failed (%T).");
|
|
}
|
|
|
|
|
|
int
|
|
Semaphore::value () const
|
|
{
|
|
int value;
|
|
|
|
if (::sem_getvalue (&_semaphore, &value))
|
|
Iex::throwErrnoExc ("Cannot read semaphore value (%T).");
|
|
|
|
return value;
|
|
}
|
|
|
|
|
|
} // namespace IlmThread
|
|
|
|
#endif
|