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Cannot Lock Session Scope Coldfusion

Note You can take out any pair of lock/unlock steps if you do not need to lock a particular scope. The following table shows one scenario that would cause a deadlock: User 1 User 2 Locks the Session scope. Features Server Application Session No automatic checking or locking Yes Yes Yes Full checking Yes Yes Yes Automatic read locking Yes Yes Yes Single Threaded Sessions Yes Each feature In the bad old days, if you were not careful, you could be simultaneously reading and writing the same memory address. have a peek here

Controlling locking access to files and CFX tags with the name attributeThe cflockname attribute provides a second way to identify locks. There must be the possibility of a race condition resulting in a NEGATIVE outcome." You can even nest CFLOCK tags, such as have a named lock around a transaction, and session Specifies the name of the lock. All rights reserved. https://forums.adobe.com/thread/81366

For more examples of using locking in applications, see Examples of cflock. Ensure that applications do not try to simultaneously access ColdFusion extension tags written using the CFX API that are not thread-safe. Integrating CF ORM into FW/1 and Stackoverflow bul...

CFML: Preventing onApplicationStart from kicking o... Exclusive locks are required to ensure the integrity of these updates, but they have a significant impact on performance. Adobe's own guidance - the one I mention two comments above this one - makes it clear what you're saying is out of date, and states that the considerations to watch share|improve this answer answered Nov 17 '08 at 20:19 Anne Porosoff 1,7111417 add a comment| up vote 0 down vote This is an example from the ColdFusion 8 documentation that uses

Re: Cannot lock session scope Newsgroup_User Jun 21, 2007 2:16 PM (in response to grossIncome) "Do you know which one should have this tag? Application and/or Session variables must also be enabled in the ColdFusion Administrator but I have alreadyt enabled application/session in admin part can some body help me. IE: function onApplicationStart(){ logIt("Begin onApplicationStart()"); logIt("Before lock onApplicationStart()"); lock name="applicationEventHandlers" type="exclusive" timeout=variables.sleepDuration/100 { logIt("Top of lock onApplicationStart()"); sleep(variables.sleepDuration); logIt("Mid onApplicationStart()"); sleep(variables.sleepDuration); logIt("Bottom of lock onApplicationStart()"); } logIt("After https://groups.google.com/d/topic/framework-one/RIbeKNouUYs Copy the variables back to the shared scope in code with an exclusive lock in the Application.cfc onRequestEnd method on the OnRequestEnd.cfm page.

Sample locking scenariosThe following examples present scenarios in which you need to lock ColdFusion code. TYVM FYI, I have been reading. Here's a pseudo-code example: The current value of session.count is 1 Take the current value of session.count as variables.count Add one to variables.count Set session.count to be the updated value of Hello World Request related functionality should not be used w...

You can also cause deadlocks if you nest locks of different types. http://stackoverflow.com/questions/18073512/should-i-always-need-to-use-cflock-with-session-scope-variables In the cflock tag, specify scope="Session". One had to have code like this: read" timeout="2" throwontimeout="true"> isDefined("session.foo")> exclusive" timeout="2" throwontimeout="true"> session.foo = TWO sets SESSION.shownote = 1 TWO checks for SESSION.shownote.

Again this must be included in every file that you want to be part of the same "Application". navigate here Subscribed! Syntax TIMEOUT Required. Tries to lock the Session scope, but the Session scope is already locked by User 1.

In the cflock tag, specify scope="Application". Hit shutdownRequest.cfm, and after a few seconds whilst it's still running... Nice Looking Picture Frame 7. http://ecoflashapps.com/cannot-lock/cannot-lock-lock-file-etc-mtab-timed-out.html Suppose that ColdFusion processes two ticket orders at approximately the same time, and that the value of Application.totalTicketsSold is initially 160.

asked 3 years ago viewed 1466 times active 2 years ago Upcoming Events 2016 Community Moderator Election ends Nov 22 Get the weekly newsletter! Similarly, you may want to lock writes to the application scope, but not reads. However, if a read-only lock is active and code with an exclusive lock with the same scope or name is waiting to execute, read-only requests using the same scope or name

ColdFusion bugs I'd like to see dealt with: param ...

People tend to ignore such "negligible things" and screw up big time, even if it's just "that one case". –Alex Aug 6 '13 at 19:04 Feel free to downvote Compare elements iteratively "Carrie has arrived at the airport for two hours." - Is this sentence grammatically correct? Nothing concrete. It must be included in every file that will be part of the same application as defined by the 'Name' parameter.

Very large time-outs can block request threads for long periods of time and radically decrease throughput. Unlock the application scope. 6. share|improve this answer edited Jan 13 '12 at 19:02 Shawn Holmes 3,4751423 answered Nov 17 '08 at 20:39 Nathan Strutz 6,83612643 You might want to be cautious of exclusive http://ecoflashapps.com/cannot-lock/cannot-lock-lock-file-etc-mtab.html abort Cool Regex Tool!