From 3dfe2108cfab31ba3ee5527e217d0d8e99a51162 Mon Sep 17 00:00:00 2001
From: git perforce import user <a@b>
Date: Tue, 25 Oct 2016 12:29:14 -0600
Subject: Initial commit: PhysX 3.4.0 Update @ 21294896 APEX 1.4.0 Update @
 21275617

[CL 21300167]
---
 APEX_1.4/common/src/ReadCheck.cpp | 63 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 APEX_1.4/common/src/ReadCheck.cpp

(limited to 'APEX_1.4/common/src/ReadCheck.cpp')

diff --git a/APEX_1.4/common/src/ReadCheck.cpp b/APEX_1.4/common/src/ReadCheck.cpp
new file mode 100644
index 00000000..fe6994d9
--- /dev/null
+++ b/APEX_1.4/common/src/ReadCheck.cpp
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2008-2015, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * NVIDIA CORPORATION and its licensors retain all intellectual property
+ * and proprietary rights in and to this software, related documentation
+ * and any modifications thereto.  Any use, reproduction, disclosure or
+ * distribution of this software and related documentation without an express
+ * license agreement from NVIDIA CORPORATION is strictly prohibited.
+ */
+
+// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
+// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.  
+
+
+#include "ReadCheck.h"
+#include "ApexRWLockable.h"
+#include "PsThread.h"
+#include "ApexSDKIntl.h"
+
+namespace nvidia
+{
+namespace apex
+{
+
+ReadCheck::ReadCheck(const ApexRWLockable* scene, const char* functionName)
+	: mLockable(scene), mName(functionName), mErrorCount(0)
+{
+	if (GetApexSDK()->isConcurrencyCheckEnabled() && mLockable && !mLockable->isEnabled())
+	{
+		if (!mLockable->startRead() && !mLockable->isEnabled())
+		{
+			APEX_INTERNAL_ERROR("An API read call (%s) was made from thread %d but acquireReadLock() was not called first, note that "
+				"when ApexSDKDesc::enableConcurrencyCheck is enabled all API reads and writes must be "
+				"wrapped in the appropriate locks.", mName, uint32_t(nvidia::Thread::getId()));
+		}
+
+		// Record the NpScene read/write error counter which is
+		// incremented any time a NpScene::startWrite/startRead fails
+		// (see destructor for additional error checking based on this count)
+		mErrorCount = mLockable->getReadWriteErrorCount();
+	}
+}
+
+
+ReadCheck::~ReadCheck()
+{
+	if (GetApexSDK()->isConcurrencyCheckEnabled() && mLockable)
+	{
+		// By checking if the NpScene::mConcurrentErrorCount has been incremented
+		// we can detect if an erroneous read/write was performed during 
+		// this objects lifetime. In this case we also print this function's
+		// details so that the user can see which two API calls overlapped
+		if (mLockable->getReadWriteErrorCount() != mErrorCount && !mLockable->isEnabled())
+		{
+			APEX_INTERNAL_ERROR("Leaving %s on thread %d, an API overlapping write on another thread was detected.", mName, uint32_t(nvidia::Thread::getId()));
+		}
+
+		mLockable->stopRead();
+	}
+}
+
+}
+}
\ No newline at end of file
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