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  • October 2012 Critical Patch Update and Critical Patch Update for Java SE Released

    - by Eric P. Maurice
    Hi, this is Eric Maurice. Oracle has just released the October 2012 Critical Patch Update and the October 2012 Critical Patch Update for Java SE.  As a reminder, the release of security patches for Java SE continues to be on a different schedule than for other Oracle products due to commitments made to customers prior to the Oracle acquisition of Sun Microsystems.  We do however expect to ultimately bring Java SE in line with the regular Critical Patch Update schedule, thus increasing the frequency of scheduled security releases for Java SE to 4 times a year (as opposed to the current 3 yearly releases).  The schedules for the “normal” Critical Patch Update and the Critical Patch Update for Java SE are posted online on the Critical Patch Updates and Security Alerts page. The October 2012 Critical Patch Update provides a total of 109 new security fixes across a number of product families including: Oracle Database Server, Oracle Fusion Middleware, Oracle E-Business Suite, Supply Chain Products Suite, Oracle PeopleSoft Enterprise, Oracle Customer Relationship Management (CRM), Oracle Industry Applications, Oracle FLEXCUBE, Oracle Sun products suite, Oracle Linux and Virtualization, and Oracle MySQL. Out of these 109 new vulnerabilities, 5 affect Oracle Database Server.  The most severe of these Database vulnerabilities has received a CVSS Base Score of 10.0 on Windows platforms and 7.5 on Linux and Unix platforms.  This vulnerability (CVE-2012-3137) is related to the “Cryptographic flaws in Oracle Database authentication protocol” disclosed at the Ekoparty Conference.  Because of timing considerations (proximity to the release date of the October 2012 Critical Patch Update) and the need to extensively test the fixes for this vulnerability to ensure compatibility across the products stack, the fixes for this vulnerability were not released through a Security Alert, but instead mitigation instructions were provided prior to the release of the fixes in this Critical Patch Update in My Oracle Support Note 1492721.1.  Because of the severity of these vulnerabilities, Oracle recommends that this Critical Patch Update be installed as soon as possible. Another 26 vulnerabilities fixed in this Critical Patch Update affect Oracle Fusion Middleware.  The most severe of these Fusion Middleware vulnerabilities has received a CVSS Base Score of 10.0; it affects Oracle JRockit and is related to Java vulnerabilities fixed in the Critical Patch Update for Java SE.  The Oracle Sun products suite gets 18 new security fixes with this Critical Patch Update.  Note also that Oracle MySQL has received 14 new security fixes; the most severe of these MySQL vulnerabilities has received a CVSS Base Score of 9.0. Today’s Critical Patch Update for Java SE provides 30 new security fixes.  The most severe CVSS Base Score for these Java SE vulnerabilities is 10.0 and this score affects 10 vulnerabilities.  As usual, Oracle reports the most severe CVSS Base Score, and these CVSS 10.0s assume that the user running a Java Applet or Java Web Start application has administrator privileges (as is typical on Windows XP). However, when the user does not run with administrator privileges (as is typical on Solaris and Linux), the corresponding CVSS impact scores for Confidentiality, Integrity, and Availability are "Partial" instead of "Complete", typically lowering the CVSS Base Score to 7.5 denoting that the compromise does not extend to the underlying Operating System.  Also, as is typical in the Critical Patch Update for Java SE, most of the vulnerabilities affect Java and Java FX client deployments only.  Only 2 of the Java SE vulnerabilities fixed in this Critical Patch Update affect client and server deployments of Java SE, and only one affects server deployments of JSSE.  This reflects the fact that Java running on servers operate in a more secure and controlled environment.  As discussed during a number of sessions at JavaOne, Oracle is considering security enhancements for Java in desktop and browser environments.  Finally, note that the Critical Patch Update for Java SE is cumulative, in other words it includes all previously released security fixes, including the fix provided through Security Alert CVE-2012-4681, which was released on August 30, 2012. For More Information: The October 2012 Critical Patch Update advisory is located at http://www.oracle.com/technetwork/topics/security/cpuoct2012-1515893.html The October 2012 Critical Patch Update for Java SE advisory is located at http://www.oracle.com/technetwork/topics/security/javacpuoct2012-1515924.html.  An online video about the importance of keeping up with Java releases and the use of the Java auto update is located at http://medianetwork.oracle.com/video/player/1218969104001 More information about Oracle Software Security Assurance is located at http://www.oracle.com/us/support/assurance/index.html  

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  • Is type safety worth the trade-offs?

    - by Prof Plum
    I began coding in in Python primarily where there is no type safety, then moved to C# and Java where there is. I found that I could work a bit more quickly and with less headaches in Python, but then again, my C# and Java apps are at much higher level of complexity so I have never given Python a true stress test I suppose. The Java and C# camps make it sound like without the type safety in place, most people would be running into all sorts of horrible bugs left an right and it would be more trouble than its worth. This is not a language comparison, so please do not address issues like compiled vs interpreted. Is type safety worth the hit to speed of development and flexibilty? WHY? to the people who wanted an example of the opinion that dynamic typing is faster: "Use a dynamically typed language during development. It gives you faster feedback, turn-around time, and development speed." - http://blog.jayway.com/2010/04/14/static-typing-is-the-root-of-all-evil/

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  • Safety using $_SERVER variables

    - by DiogoNeves
    Hi all, I'm working on a system that relies in $_SERVER['REMOTE_ADDR'] to get the user address and check it against a white list of addresses. Is this approach safe? Or is there a way of forcing values in superglobal variables? Thank you, Diogo

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  • Thread safety in C# arrays

    - by Betamoo
    Does having 2 different threads : one reading from a C# array (e.g from first location), and another one writing to the same C# array but to a different location(e.g to the last location) is thread safe or not? (And I mean here without locking reading nor writing)

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  • What are the safety benefits of a type system?

    - by vandros526
    In Javascript: The Good Parts by Douglas Crockford, he mentions in his inheritance chapter, "The other benefit of classical inheritance is that it includes the specification of a system of types. This mostly frees the programmer from having to write explicit casting operations, which is a very good thing because when casting, the safety benefits of a type system are lost." So first of all, what actually is safety? protection against data corruption, or hackers, or system malfunctions, etc? What are the safety benefits of a type system? What makes a type system different that allows it to provide these safety benefits?

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  • What is the difference between safety and security?

    - by Lernkurve
    Question What is the difference between safety and security in the context of information management or computer science? Elaboration This could be the canonical answer for people searching for it. Let me know if superuser.com is the wrong site for this question. I have, of course, googled it and haven't found an answer that seemed short and to the point. Wikipedia wasn't very helpful either: safety, information security.

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  • How do you troubleshoot Family Safety reports

    - by Klas Mellbourn
    I have set up Microsoft Family Safety in Windows 8 for my daughter's account. At first I got meaningful reports via e-mail each week. But then the e-mails started reporting no activity, even though my daughter still uses the computer. The e-mails are still sent to me, but indicate that she is not using the computer at all. Family Safety is definitely still active on the computer. It limits how long she can use the computer. So only the e-mail reports are buggy. I don't know how to troubleshoot this since the e-mails are generated by Microsoft. Any ideas?

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  • Integrating Oracle Argus Safety with other Clinical Systems Using Argus Interchange's E2B Functionality

    - by Roxana Babiciu
    Over the past few years, companies conducting clinical trials have increasingly been interested in integrating their pharmacovigilance systems with other clinical and safety solutions to streamline their processes. Please join BioPharm Systems’ Dr. Rodney Lemery, vice president of safety and pharmacovigilance, for a one-hour webinar in which he will discuss the ability to integrate Oracle’s Argus Safety with other applications using the safety system’s inherent extended E2B functionality. Read more here

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  • Critical Patch Update for Oracle Fusion Middleware - CPU October 2013

    - by Daniel Mortimer
    The latest Critical Patch Update (CPU) has been released for Oracle products. Start your reading here Critical Patch Updates, Security Alerts and Third Party Bulletin  This is the home page containing links to all "Critical Patch Updates" released to date, along with sections detailing  Security Alerts  Third Party Bulletin Public Vulnerabilities Fixed Policies Reporting Security Vulnerabilities On this page you will find the link to the Oracle Critical Patch Update Advisory - October 2013 The advisory lists the support documents that cover the patch availability for all Oracle products. For Oracle Fusion Middleware, go to: Patch Set Update and Critical Patch Update October 2013 Availability Document [ID 1571391.1] If you are hit any unexpected errors when applying the CPU patches, check out the known issues documented in these two support documents. Critical Patch Update October 2013 Oracle Fusion Middleware Known Issues  [ID 1571369.1] Critical Patch Update October 2013 Database Known Issues [ID 1571653.1] And lastly, for an informal summary of what the Critical Patch Update fixes, check out the blog posts by "Oracle Software Security Assurance" team October 2013 Critical Patch Update Released

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  • Boost BGL thread safety

    - by Budzoli
    Hi! I'd like multiple threads to use the dijkstra_shortest_paths and astar_search functions of the BGL, and then read the property maps of the result vertices and edges. I'm wondering wether I should use mutexes to ensure thread-safety. So here are my questions: 1., Are the dijkstra_shortest_paths and astar_search functions of the Boost.Graph thread safe? 2., If I only try to read the property maps of the graph from multiple threads, do I need to worry about thread safety?

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  • Los Angeles Department of Building & Safety Lowers Customer Service Costs with Oracle WebCenter

    - by Kellsey Ruppel
    Register Now for this Webcast. Los Angeles Department of Building & Safety Lowers Customer Service Costs with Oracle WebCenter Los Angeles Department of Building & Safety (LADBS) is one of the largest construction permitting departments in the country, serving over 350,000 walk-in and 530,000 phone customers, and issuing over 110,000 permits worth $3 Billion every year. LADBS needed a way to migrate walk-in and phone transactions to customer self-service, so they turned to Oracle WebCenter and teamed with Oracle Partner 3Di to deliver a customer self-service portal to lower their cost of customer service operation, while increasing customer satisfaction. Attend this Webcast to learn how Oracle WebCenter has allowed Los Angeles Department of Building & Safety to: Deliver a state of the art customer self-service portal Reduce traffic on high cost, low satisfaction customer service channels Integrate business workflows and legacy applications Register Now for this Webcast. REGISTER NOW Register now for this exclusive event. Wednesday, November 14, 2012 10 a.m. PT / 1 p.m. ET Presented by: Giovani DacumosDirector of Systems, Los Angeles Department of Building & Safety Jing ReyesApplications Development Group Manager, Los Angeles Department of Building & Safety Rajiv Desai CEO, 3Di Sheetal ParanjpyeProject Manager, 3Di Presented by: Copyright © 2012, Oracle. All rights reserved. Contact Us | Legal Notices and Terms of Use | Privacy Statement

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  • Critical Patch Update for October 2012 Now Available

    - by Steven Chan (Oracle Development)
    The Critical Patch Update (CPU) for October 2012 was released on July 16, 2012. Oracle strongly recommends applying the patches as soon as possible. The Critical Patch Update Advisory is the starting point for relevant information. It includes a list of products affected, pointers to obtain the patches, a summary of the security vulnerabilities, and links to other important documents. Supported products that are not listed in the "Supported Products and Components Affected" Section of the advisory do not require new patches to be applied. Also, it is essential to review the Critical Patch Update supporting documentation referenced in the Advisory before applying patches, as this is where you can find important pertinent information. The Critical Patch Update Advisory is available at the following location: Oracle Technology Network The next four Critical Patch Update release dates are: January 15, 2013 April 16, 2013 July 16, 2013 October 15, 2013 E-Business Suite Releases 11i and 12 Reference Oracle E-Business Suite Releases 11i and 12 Critical Patch Update Knowledge Document (October 2012) (Note 1486535.1)

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  • How can I enable Gnome Shell Extensions with Ubuntu 11.10?

    - by TheGeeko61
    I am having a problem similar to that asked (and solved) here: Can't enable GNOME Shell extensions. I have performed both of the "tweaks" explained in that solution (i.e., here and here); but that does not seem to help. My gnome-shell is version 3.2.1. When I run gnome-tweak-tool from a shell, I get the following output: CRITICAL: Unknown extension error CRITICAL: Unknown extension error CRITICAL: Unknown extension error CRITICAL: Unknown extension error CRITICAL: Unknown extension error CRITICAL: Unknown extension error CRITICAL: Unknown extension error (gnome-tweak-tool:7823): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width = 0' failed (gnome-tweak-tool:7823): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width = 0' failed (gnome-tweak-tool:7823): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width = 0' failed (gnome-tweak-tool:7823): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width = 0' failed (gnome-tweak-tool:7823): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width = 0' failed (gnome-tweak-tool:7823): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width = 0' failed (gnome-tweak-tool:7823): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width = 0' failed (gnome-tweak-tool:7823): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width = 0' failed (gnome-tweak-tool:7823): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width = 0' failed (gnome-tweak-tool:7823): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width = 0' failed (gnome-tweak-tool:7823): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width = 0' failed (gnome-tweak-tool:7823): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width = 0' failed (gnome-tweak-tool:7823): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width = 0' failed (gnome-tweak-tool:7823): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width = 0' failed (gnome-tweak-tool:7823): Gtk-CRITICAL **: gtk_widget_get_preferred_height_for_width: assertion `width = 0' failed Has anyone actually solved this besides to the references above? I have made the suggested modifications from those sites.

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  • Thread Safety of C# List<T> for readers

    - by ILIA BROUDNO
    I am planning to create the list once in a static constructor and then have multiple instances of that class read it (and enumerate through it) concurrently without doing any locking. In this article http://msdn.microsoft.com/en-us/library/6sh2ey19.aspx MS describes the issue of thread safety as follows: Public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe. A List can support multiple readers concurrently, as long as the collection is not modified. Enumerating through a collection is intrinsically not a thread-safe procedure. In the rare case where an enumeration contends with one or more write accesses, the only way to ensure thread safety is to lock the collection during the entire enumeration. To allow the collection to be accessed by multiple threads for reading and writing, you must implement your own synchronization. The "Enumerating through a collection is intrinsically not a thread-safe procedure." Statement is what worries me. Does this mean that it is thread safe for readers only scenario, but as long as you do not use enumeration? Or is it safe for my scenario?

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  • April 2010 Critical Patch Update Released

    - by eric.maurice
    Hi, this is Eric Maurice. Today Oracle released the April 2010 Critical Patch Update (CPUApr2010),the first one to include security fixes for Oracle Solaris. Today's Critical Patch Update (CPU) provides 47 new security fixes across the following product families: Oracle Database Server, Oracle Fusion Middleware, Oracle Collaboration Suite, Oracle E-Business Suite, Oracle PeopleSoft Enterprise, Oracle Life Sciences, Retail, and Communications Industry Suites, and Oracle Solaris. 28 of these 47 new vulnerabilities are remotely exploitable without authentication, but the criticality of the affected components and the severity of these vulnerabilities vary greatly. Customers should, as usual, refer to the Risk Matrices in the CPU Advisory to assess the relevance of these fixes for their environment (and the urgency with which to apply the fixes). 7 of the 47 new vulnerabilities affect various versions of Oracle Database Server. None of these 7 vulnerabilities are remotely exploitable without authentication. Furthermore, none of these fixes are applicable to client-only deployments. The most severe CVSS Base Score for the Database Server vulnerabilities is 7.1. As a reminder, information about Oracle's use of the CVSS 2.0 standard can be found in Note 394487.1 (My Oracle Support subscription required). Note that this Critical Patch Update includes fixes for vulnerabilities that were publicly disclosed by David Litchfield at the BlackHat DC Conference in early February (CVE-2010-0866 and CVE-2010-0867). 5 of the 47 new vulnerabilities affect various components of the Oracle Fusion Middleware product family. The highest CVSS Base Score for these vulnerabilities is 7.5. Note that the patches for Oracle WebLogic Server are cumulative and this Critical Patch Update therefore also includes a fix for a vulnerability (CVE-2010-0073) that was the subject of a Security Alert issued by Oracle on February 4, 2010. Customers, who have not applied the previously-released patch, should apply today's Critical Patch Update as soon as possible. As stated at the beginning of this blog, it is also noteworthy to highlight that this Critical Patch Update provides 16 new fixes for the Sun product line. With the recent close of the Sun acquisition both security organizations have worked diligently to align Sun's previous security practices with Oracle's. Java users know that Oracle released a Critical Patch Update for Java SE and Java For Business earlier this month (in accordance with the Java patching schedule previously published by Sun Microsystems). Please note that for the first time, the Java advisories included CVSS Scores to help assess the severity of the new vulnerabilities fixed with the advisory. The rapid inclusion of the Solaris product lines in the Critical Patch Update and the extension of Oracle Software Security Assurance to Sun technologies are evidence of the flexibility of Oracle's security assurance programs. These should also result in tangible security benefits for the users of the Oracle hardware and software stack (such as a predictable patching schedule for all Oracle products).

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  • Critical Patch Update for April 2010 Now Available

    - by Steven Chan
    The Critical Patch Update (CPU) for April 2010 was released on April 13, 2010. Oracle strongly recommends applying the patches as soon as possible.The Critical Patch Update Advisory is the starting point for relevant information. It includes a list of products affected, pointers to obtain the patches, a summary of the security vulnerabilities, and links to other important documents.Supported Products that are not listed in the "Supported Products and Components Affected" Section of the advisory do not require new patches to be applied.Also, it is essential to review the Critical Patch Update supporting documentation referenced in the Advisory before applying patches, as this is where you can find important pertinent information.The Critical Patch Update Advisory is available at the following location:Oracle Technology NetworkThe next four Critical Patch Update release dates are:July 13, 2010October 12, 2010January 18, 2011April 19, 2011

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  • [Java] Type safety: Unchecked cast from Object

    - by Matthew
    Hi, I try to cast an object to my Action class, but it results in a warning: Type safety: Unchecked cast from Object to Action<ClientInterface> Action<ClientInterface> action = null; try { Object o = c.newInstance(); if (o instanceof Action<?>) { action = (Action<ClientInterface>) o; } else { // TODO 2 Auto-generated catch block throw new InstantiationException(); } [...] Thank you for any help

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  • Critical Patch Update For Oracle Fusion Middleware - CPU October 2012

    - by Daniel Mortimer
    The latest Critical Patch Update (CPU) has been released for Oracle products. Start your reading hereCritical Patch Updates, Security Alerts and Third Party Bulletin  This is the home page containing links to all "Critical Patch Updates" released to date, along with sections detailing  Security Alerts  Third Party Bulletin Public Vulnerabilities Fixed Policies Reporting Security Vulnerabilities  On this page you will find the link to the Oracle Critical Patch Update Advisory - October 2012 The advisory lists the support documents that cover the patch availability for all Oracle products. From an Oracle Fusion Middleware perspective, you can cut to the chase by using the links below which take you to the appropriate sections inPatch Set Update and Critical Patch Update October 2012 Availability Document [ID 1477727.1] Oracle Fusion Middleware 11g Release 2  11.1.2.0 Oracle Fusion Middleware 11g Release 1 11.1.1.4 (Portal,Forms,Reports and Discoverer) 11.1.1.5 11.1.1.6 Oracle Application Server 10g Release 3 10.1.3.5 The #anchor links above should work in Firefox and IE provided you have already logged into My Oracle Support within the same browser session. For some reason, Chrome always takes you to the top of the document :-/ Tip: Error Correction Support for Oracle Identity Management 10g, version 10.1.4.x ended in December 2011. For this reason, there is no section which is specific to this version. However, Error Correction Support remains in place, until end of this year, for the Oracle Identity Management 10.1.4.x components Single Sign On (SSO) Delegated Administration Services (OIDDAS) provided you are using them as part of a Single Sign-On solution (OID 11g + SSO / OIDDAS 10.1.4.3) for a Portal / Forms / Reports and Discoverer 11.1.1.x architecture.    As such there are security related patches available for Fusion Middleware Single Sign On. You will find the patch numbers listed in the sections for 11.1.1.4, 11.1.1.5 and 11.1.1.6 And finally, if you are hit any unexpected errors when applying the CPU patches, check out the known issues documented in these two support documents. Critical Patch Update October 2012 Oracle Fusion Middleware Known Issues (Doc ID 1455408.1) Critical Patch Update October 2012 Database Known Issues (Doc ID 1477865.1)

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  • How to protect critical section in PHP?

    - by Morgan Cheng
    I did some search about this topic but found nothing valuable. If I don't use PHP default session handler, there is no session lock at request level. So, I have to protect critical section by myself. In Java, we have synchronized. In C#, we have lock. In PHP, how to do that?

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  • February 2011 Java SE and Java for Business Critical Patch Update Released

    - by eric.maurice
    Hello, this is Eric Maurice again. Oracle released the February 2011 Critical Patch Update for Java SE and Java for Business today. As discussed in a previous blog entry, Oracle currently maintains a separate Critical Patch Update schedule for Java SE and Java for Business because of commitments made prior to the Oracle acquisition in regards to the timing for the publication of Java fixes. Today's Java Critical Patch Update includes fixes for 21 vulnerabilities. The most severe CVSS Base Score for vulnerabilities fixed in this CPU is 10.0, and this Base Score affects 8 vulnerabilities. Out of these 21 vulnerabilities, 13 affect Java client deployments. 12 of these 13 vulnerabilities can be exploited through Untrusted Java Web Start applications and Untrusted Java Applets, which run in the Java sandbox with limited privileges. One of these 13 vulnerabilities can be exploited by running a standalone application. In addition, one of the client vulnerability affects Java Update, a Windows-specific component. 3 of the 21 vulnerabilities affect client and server deployments. These vulnerabilities can be exploited through Untrusted Java Web Start applications and Untrusted Java Applets, as well as be exploited by supplying malicious data to APIs in the specified components, such as, for example, through a web service. 3 vulnerabilities affect Java server deployments only. These vulnerabilities can be exploited by supplying malicious data to APIs in the specified Java components. Note that one of these vulnerabilities (CVE-2010-4476) was the subject of a Security Alert released on February 8th. Finally, one of these vulnerabilities is specific to Java DB, a component in the Java JDK, but not included in the Java Runtime Environment (JRE). As usual, because of the severity of the vulnerabilities fixed in this Critical Patch Update, Oracle recommends that Java customers apply it as soon as possible. The Critical Patch Advisory provides more details about the vulnerabilities addressed in the Critical Patch Update as well as instructions on how to install the fixes and where to get them. Home users should use the Java auto-update mechanism to install the latest version of the Java Runtime Environment 6 update 24 or higher (JRE), which includes the fix for this vulnerability. For More Information: The Critical Patch Updates and Security Alerts page is located at http://www.oracle.com/technetwork/topics/security/alerts-086861.html More information on Oracle Software Security Assurance is located at http://www.oracle.com/us/support/assurance/index.html Consumers can go to http://www.java.com/en/download/installed.jsp to ensure that they have the latest version of Java running on their desktops. More information on Java Update is available at http://www.java.com/en/download/help/java_update.xml

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  • Achieving Thread-Safety

    - by Smasher
    Question How can I make sure my application is thread-safe? Are their any common practices, testing methods, things to avoid, things to look for? Background I'm currently developing a server application that performs a number of background tasks in different threads and communicates with clients using Indy (using another bunch of automatically generated threads for the communication). Since the application should be highly availabe, a program crash is a very bad thing and I want to make sure that the application is thread-safe. No matter what, from time to time I discover a piece of code that throws an exception that never occured before and in most cases I realize that it is some kind of synchronization bug, where I forgot to synchronize my objects properly. Hence my question concerning best practices, testing of thread-safety and things like that. mghie: Thanks for the answer! I should perhaps be a little bit more precise. Just to be clear, I know about the principles of multithreading, I use synchronization (monitors) throughout my program and I know how to differentiate threading problems from other implementation problems. But nevertheless, I keep forgetting to add proper synchronization from time to time. Just to give an example, I used the RTL sort function in my code. Looked something like FKeyList.Sort (CompareKeysFunc); Turns out, that I had to synchronize FKeyList while sorting. It just don't came to my mind when initially writing that simple line of code. It's these thins I wanna talk about. What are the places where one easily forgets to add synchronization code? How do YOU make sure that you added sync code in all important places?

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  • Unit Testing Refcounted Critical Section Class

    - by BillyONeal
    Hello all :) I'm looking at a simple class I have to manage critical sections and locks, and I'd like to cover this with test cases. Does this make sense, and how would one go about doing it? It's difficult because the only way to verify the class works is to setup very complicated threading scenarios, and even then there's not a good way to test for a leak of a Critical Section in Win32. Is there a more direct way to make sure it's working correctly? Here's the code: CriticalSection.hpp: #pragma once #include <windows.h> namespace WindowsAPI { namespace Threading { class CriticalSection; class CriticalLock { std::size_t *instanceCount; CRITICAL_SECTION * criticalStructure; bool lockValid; friend class CriticalSection; CriticalLock(std::size_t *, CRITICAL_SECTION *, bool); public: bool IsValid() { return lockValid; }; void Unlock(); ~CriticalLock() { Unlock(); }; }; class CriticalSection { std::size_t *instanceCount; CRITICAL_SECTION * criticalStructure; public: CriticalSection(); CriticalSection(const CriticalSection&); CriticalSection& operator=(const CriticalSection&); CriticalSection& swap(CriticalSection&); ~CriticalSection(); CriticalLock Enter(); CriticalLock TryEnter(); }; }} CriticalSection.cpp: #include "CriticalSection.hpp" namespace WindowsAPI { namespace Threading { CriticalSection::CriticalSection() { criticalStructure = new CRITICAL_SECTION; instanceCount = new std::size_t; *instanceCount = 1; InitializeCriticalSection(criticalStructure); } CriticalSection::CriticalSection(const CriticalSection& other) { criticalStructure = other.criticalStructure; instanceCount = other.instanceCount; instanceCount++; } CriticalSection& CriticalSection::operator=(const CriticalSection& other) { CriticalSection copyOfOther(other); swap(copyOfOther); return *this; } CriticalSection& CriticalSection::swap(CriticalSection& other) { std::swap(other.instanceCount, instanceCount); std::swap(other.criticalStructure, other.criticalStructure); return *this; } CriticalSection::~CriticalSection() { if (!--(*instanceCount)) { DeleteCriticalSection(criticalStructure); delete criticalStructure; delete instanceCount; } } CriticalLock CriticalSection::Enter() { EnterCriticalSection(criticalStructure); (*instanceCount)++; return CriticalLock(instanceCount, criticalStructure, true); } CriticalLock CriticalSection::TryEnter() { bool lockAquired; if (TryEnterCriticalSection(criticalStructure)) { (*instanceCount)++; lockAquired = true; } else lockAquired = false; return CriticalLock(instanceCount, criticalStructure, lockAquired); } void CriticalLock::Unlock() { if (!lockValid) return; LeaveCriticalSection(criticalStructure); lockValid = false; if (!--(*instanceCount)) { DeleteCriticalSection(criticalStructure); delete criticalStructure; delete instanceCount; } } }}

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