147 lines
3.9 KiB
C++
147 lines
3.9 KiB
C++
///////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2005, 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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namespace IlmThread {
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using namespace Iex;
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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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} // namespace IlmThread
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