| /////////////////////////////////////////////////////////////////////////// |
| // |
| // 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 Windows |
| // |
| //----------------------------------------------------------------------------- |
| |
| #include "IlmThreadSemaphore.h" |
| #include "Iex.h" |
| #include <string> |
| #include <assert.h> |
| #include <iostream> |
| |
| namespace IlmThread { |
| |
| using namespace Iex; |
| |
| namespace { |
| |
| std::string |
| errorString () |
| { |
| LPSTR messageBuffer; |
| DWORD bufferLength; |
| std::string message; |
| |
| // |
| // Call FormatMessage() to allow for message |
| // text to be acquired from the system. |
| // |
| |
| if (bufferLength = FormatMessageA (FORMAT_MESSAGE_ALLOCATE_BUFFER | |
| FORMAT_MESSAGE_IGNORE_INSERTS | |
| FORMAT_MESSAGE_FROM_SYSTEM, |
| 0, |
| GetLastError (), |
| MAKELANGID (LANG_NEUTRAL, |
| SUBLANG_DEFAULT), |
| (LPSTR) &messageBuffer, |
| 0, |
| NULL)) |
| { |
| message = messageBuffer; |
| LocalFree (messageBuffer); |
| } |
| |
| return message; |
| } |
| |
| } // namespace |
| |
| |
| Semaphore::Semaphore (unsigned int value) |
| { |
| if ((_semaphore = ::CreateSemaphore (0, value, 0x7fffffff, 0)) == 0) |
| { |
| THROW (LogicExc, "Could not create semaphore " |
| "(" << errorString() << ")."); |
| } |
| } |
| |
| |
| Semaphore::~Semaphore() |
| { |
| bool ok = ::CloseHandle (_semaphore); |
| assert (ok); |
| } |
| |
| |
| void |
| Semaphore::wait() |
| { |
| if (::WaitForSingleObject (_semaphore, INFINITE) != WAIT_OBJECT_0) |
| { |
| THROW (LogicExc, "Could not wait on semaphore " |
| "(" << errorString() << ")."); |
| } |
| } |
| |
| |
| bool |
| Semaphore::tryWait() |
| { |
| return ::WaitForSingleObject (_semaphore, 0) == WAIT_OBJECT_0; |
| } |
| |
| |
| void |
| Semaphore::post() |
| { |
| if (!::ReleaseSemaphore (_semaphore, 1, 0)) |
| { |
| THROW (LogicExc, "Could not post on semaphore " |
| "(" << errorString() << ")."); |
| } |
| } |
| |
| |
| int |
| Semaphore::value() const |
| { |
| LONG v = -1; |
| |
| if (!::ReleaseSemaphore (_semaphore, 0, &v) || v < 0) |
| { |
| THROW (LogicExc, "Could not get value of semaphore " |
| "(" << errorString () << ")."); |
| } |
| |
| return v; |
| } |
| |
| } // namespace IlmThread |