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Open Source Computer Vision Library
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147 lines
3.8 KiB
147 lines
3.8 KiB
/////////////////////////////////////////////////////////////////////////// |
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// |
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// Copyright (c) 2005-2012, Industrial Light & Magic, a division of Lucas |
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// Digital Ltd. LLC |
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// |
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// All rights reserved. |
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// |
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// Redistribution and use in source and binary forms, with or without |
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// modification, are permitted provided that the following conditions are |
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// met: |
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// * Redistributions of source code must retain the above copyright |
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// notice, this list of conditions and the following disclaimer. |
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// * Redistributions in binary form must reproduce the above |
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// copyright notice, this list of conditions and the following disclaimer |
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// in the documentation and/or other materials provided with the |
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// distribution. |
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// * Neither the name of Industrial Light & Magic nor the names of |
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// its contributors may be used to endorse or promote products derived |
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// from this software without specific prior written permission. |
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// |
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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// |
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/////////////////////////////////////////////////////////////////////////// |
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//----------------------------------------------------------------------------- |
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// |
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// class Semaphore -- implementation for Windows |
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// |
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//----------------------------------------------------------------------------- |
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#include "IlmThreadSemaphore.h" |
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#include "Iex.h" |
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#include <string> |
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#include <assert.h> |
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#include <iostream> |
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ILMTHREAD_INTERNAL_NAMESPACE_SOURCE_ENTER |
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using namespace IEX_NAMESPACE; |
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namespace { |
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std::string |
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errorString () |
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{ |
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LPSTR messageBuffer; |
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DWORD bufferLength; |
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std::string message; |
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// |
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// Call FormatMessage() to allow for message |
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// text to be acquired from the system. |
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// |
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if (bufferLength = FormatMessageA (FORMAT_MESSAGE_ALLOCATE_BUFFER | |
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FORMAT_MESSAGE_IGNORE_INSERTS | |
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FORMAT_MESSAGE_FROM_SYSTEM, |
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0, |
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GetLastError (), |
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MAKELANGID (LANG_NEUTRAL, |
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SUBLANG_DEFAULT), |
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(LPSTR) &messageBuffer, |
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0, |
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NULL)) |
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{ |
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message = messageBuffer; |
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LocalFree (messageBuffer); |
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} |
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return message; |
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} |
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} // namespace |
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Semaphore::Semaphore (unsigned int value) |
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{ |
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if ((_semaphore = ::CreateSemaphore (0, value, 0x7fffffff, 0)) == 0) |
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{ |
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THROW (LogicExc, "Could not create semaphore " |
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"(" << errorString() << ")."); |
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} |
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} |
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Semaphore::~Semaphore() |
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{ |
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bool ok = ::CloseHandle (_semaphore) != FALSE; |
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assert (ok); |
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} |
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void |
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Semaphore::wait() |
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{ |
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if (::WaitForSingleObject (_semaphore, INFINITE) != WAIT_OBJECT_0) |
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{ |
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THROW (LogicExc, "Could not wait on semaphore " |
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"(" << errorString() << ")."); |
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} |
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} |
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bool |
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Semaphore::tryWait() |
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{ |
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return ::WaitForSingleObject (_semaphore, 0) == WAIT_OBJECT_0; |
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} |
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void |
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Semaphore::post() |
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{ |
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if (!::ReleaseSemaphore (_semaphore, 1, 0)) |
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{ |
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THROW (LogicExc, "Could not post on semaphore " |
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"(" << errorString() << ")."); |
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} |
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} |
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int |
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Semaphore::value() const |
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{ |
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LONG v = -1; |
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if (!::ReleaseSemaphore (_semaphore, 0, &v) || v < 0) |
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{ |
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THROW (LogicExc, "Could not get value of semaphore " |
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"(" << errorString () << ")."); |
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} |
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return v; |
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} |
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ILMTHREAD_INTERNAL_NAMESPACE_SOURCE_EXIT
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