init - 初始化项目

3rdparty/openexr/IlmThread/IlmThreadSemaphorePosixCompat.cpp

@@ -0,0 +1,227 @@
+///////////////////////////////////////////////////////////////////////////
+//
+// Copyright (c) 2005-2012, 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 for platforms that do
+//	support Posix threads but do not support Posix semaphores,
+//	for example, OS X
+//
+//-----------------------------------------------------------------------------
+
+#include "IlmBaseConfig.h"
+
+#if (!HAVE_POSIX_SEMAPHORES) && !defined (_WIN32) && ! defined (_WIN64)
+
+#include "IlmThreadSemaphore.h"
+#include "Iex.h"
+#include <assert.h>
+
+ILMTHREAD_INTERNAL_NAMESPACE_SOURCE_ENTER
+
+#if ILMBASE_FORCE_CXX03 && HAVE_PTHREAD
+Semaphore::Semaphore (unsigned int value)
+{
+    if (int error = ::pthread_mutex_init (&_semaphore.mutex, 0))
+        IEX_NAMESPACE::throwErrnoExc ("Cannot initialize mutex (%T).", error);
+
+    if (int error = ::pthread_cond_init (&_semaphore.nonZero, 0))
+        IEX_NAMESPACE::throwErrnoExc ("Cannot initialize condition variable (%T).",
+                            error);
+
+    _semaphore.count = value;
+    _semaphore.numWaiting = 0;
+}
+
+
+Semaphore::~Semaphore ()
+{
+    int error = ::pthread_cond_destroy (&_semaphore.nonZero);
+    assert (error == 0);
+    error = ::pthread_mutex_destroy (&_semaphore.mutex);
+    assert (error == 0);
+}
+
+
+void
+Semaphore::wait ()
+{
+    ::pthread_mutex_lock (&_semaphore.mutex);
+
+    _semaphore.numWaiting++;
+
+    while (_semaphore.count == 0)
+    {
+        if (int error = ::pthread_cond_wait (&_semaphore.nonZero,
+                                             &_semaphore.mutex))
+        {
+            ::pthread_mutex_unlock (&_semaphore.mutex);
+
+            IEX_NAMESPACE::throwErrnoExc ("Cannot wait on condition variable (%T).",
+                                          error);
+        }
+    }
+
+    _semaphore.numWaiting--;
+    _semaphore.count--;
+
+    ::pthread_mutex_unlock (&_semaphore.mutex);
+}
+
+
+bool
+Semaphore::tryWait ()
+{
+    ::pthread_mutex_lock (&_semaphore.mutex);
+    
+    if (_semaphore.count == 0)
+    {
+        ::pthread_mutex_unlock (&_semaphore.mutex);
+        return false;
+    }
+    else
+    {
+        _semaphore.count--;
+        ::pthread_mutex_unlock (&_semaphore.mutex);
+        return true;
+    }
+}
+
+
+void
+Semaphore::post ()
+{
+    ::pthread_mutex_lock (&_semaphore.mutex);
+
+    if (_semaphore.numWaiting > 0)
+    {
+        int error;
+        if (_semaphore.numWaiting > 1 && _semaphore.count > 1)
+        {
+            error =  ::pthread_cond_broadcast (&_semaphore.nonZero);
+        }
+        else
+        {
+            error = ::pthread_cond_signal (&_semaphore.nonZero);
+        }
+        if (error)
+        {
+            ::pthread_mutex_unlock (&_semaphore.mutex);
+
+            IEX_NAMESPACE::throwErrnoExc ("Cannot signal condition variable (%T).",
+                                error);
+        }
+    }
+
+    _semaphore.count++;
+    ::pthread_mutex_unlock (&_semaphore.mutex);
+}
+
+
+int
+Semaphore::value () const
+{
+    ::pthread_mutex_lock (&_semaphore.mutex);
+    int value = _semaphore.count;
+    ::pthread_mutex_unlock (&_semaphore.mutex);
+    return value;
+}
+#else
+Semaphore::Semaphore (unsigned int value)
+{
+    _semaphore.count = value;
+    _semaphore.numWaiting = 0;
+}
+
+
+Semaphore::~Semaphore ()
+{
+}
+
+
+void
+Semaphore::wait ()
+{
+    std::unique_lock<std::mutex> lk(_semaphore.mutex);
+
+    _semaphore.numWaiting++;
+
+    while (_semaphore.count == 0)
+        _semaphore.nonZero.wait (lk);
+
+    _semaphore.numWaiting--;
+    _semaphore.count--;
+}
+
+
+bool
+Semaphore::tryWait ()
+{
+    std::lock_guard<std::mutex> lk(_semaphore.mutex);
+    
+    if (_semaphore.count == 0)
+        return false;
+
+    _semaphore.count--;
+    return true;
+}
+
+
+void
+Semaphore::post ()
+{
+    std::lock_guard<std::mutex> lk(_semaphore.mutex);
+
+    _semaphore.count++;
+    if (_semaphore.numWaiting > 0)
+    {
+        if (_semaphore.count > 1)
+            _semaphore.nonZero.notify_all();
+        else
+            _semaphore.nonZero.notify_one();
+    }
+}
+
+
+int
+Semaphore::value () const
+{
+    std::lock_guard<std::mutex> lk(_semaphore.mutex);
+    return _semaphore.count;
+}
+#endif
+
+ILMTHREAD_INTERNAL_NAMESPACE_SOURCE_EXIT
+
+#endif