110 lines
2.5 KiB
C++
110 lines
2.5 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2018 Danny Robson <danny@nerdcruft.net>
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*/
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#include "semaphore_win32.hpp"
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#include "../win32/except.hpp"
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#include "../win32/windows.hpp"
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#include <winbase.h>
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using cruft::thread::semaphore;
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///////////////////////////////////////////////////////////////////////////////
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semaphore::semaphore ():
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semaphore (1)
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{ ; }
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//-----------------------------------------------------------------------------
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semaphore::semaphore (value_type initial):
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m_handle (
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win32::error::try_call (
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CreateSemaphore,
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nullptr,
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initial,
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std::numeric_limits<LONG>::max (),
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nullptr
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)
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)
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{
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m_value = initial;
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}
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///////////////////////////////////////////////////////////////////////////////
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semaphore::value_type
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semaphore::acquire (value_type const count)
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{
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CHECK_GE (count, 0);
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for (value_type i = 0; i < count; ++i) {
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if (WAIT_OBJECT_0 != WaitForSingleObject(m_handle.native(), INFINITE))
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win32::error::throw_code();
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--m_value;
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}
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return m_value;
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}
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//-----------------------------------------------------------------------------
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semaphore::value_type
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semaphore::acquire (void)
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{
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return acquire (1);
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}
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//-----------------------------------------------------------------------------
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semaphore::value_type
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semaphore::release (value_type count)
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{
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LONG previous;
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for (value_type i = 0; i < count; ++i) {
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if (!ReleaseSemaphore (m_handle.native(), count, &previous))
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win32::error::throw_code ();
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++m_value;
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}
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return previous + 1;
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}
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//-----------------------------------------------------------------------------
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semaphore::value_type
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semaphore::release (void)
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{
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return release (1);
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}
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///////////////////////////////////////////////////////////////////////////////
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semaphore::value_type
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semaphore::value (void) const
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{
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return m_value;
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}
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//-----------------------------------------------------------------------------
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semaphore::value_type
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semaphore::operator++ (void)
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{
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return release ();
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}
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//-----------------------------------------------------------------------------
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semaphore::value_type
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semaphore::operator-- (void)
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{
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return acquire ();
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}
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