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Now that you have seen how Pylons uses Routes and you understand the details of how URLs are matched, you can turn your attention once again to how to generate URLs. Routes includes two functions for use in your web application that you will find yourself using frequently: h.url_for() redirect_to() You ve already seen the h.url_for() function a few times, and you ll recall that to make it available in your controllers and templates, you need to import it into your project s lib/helpers.py file from the routes module. The redirect_to() function is automatically imported into your controllers from the pylons.controllers.util module. It is used to redirect a controller to a different URL within your application. If you look at the page controller in the SimpleSite project you ve been developing, you ll see that up to now redirects have been coded manually by specifying the correct HTTP status code for a redirect and setting a Location HTTP header using the response global. Here s the save() action as an example:

to wait until it is unlocked by the current holder before it can lock it It is said that the method blocks until it can be completed The lock and unlock operations are atomic, which means that they are treated as single undivisable operations that can t be interrupted during execution This is important because locking a mutex is a two-step process First the thread checks that the mutex isn t locked; then it marks it as locked If the first thread would be interrupted after having checked, and the second thread then checks and locks the mutex, the first thread will think that the mutex is unlocked when it resumes It will then mark an already locked mutex as locked, which creates a situation in which two threads think that they have locked the mutex.

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Garay, Juan A, and Yoram Moses 1993 Fully polynomial Byzantine agreement in t +1 rounds In Proceedings of the 25th Annual ACM Symposium on Theory of Computing, 31 41 New York: ACM Press Garcia-Molina, Hector, Frank Pitelli, and Susan B Davidson March 1986 Applications of Byzantine agreement in database systems ACM Transactions on Database Systems 11 (1): 27 47 Garrett, Jesse James 2005 Ajax: A new approach to web applications Adaptive Path, February 18 wwwadaptivepathcom/publications/essays/archives/000385php Gonzalez, Guadalupe 2000 Statement for the record of Guadalupe Gonzalez, Special Agent in Charge, Phoenix Field Division, Federal Bureau of Investigation, on cybercrime, before a special field hearing Senate Committee on Judiciary Subcommittee on Technology, Terrorism, and Government Information, April 21 wwwmilnetcom/infowar/ gonza042100htm Gordon, John 1984 The story of Alice and Bob Extract from a speech given at the Zurich Seminar, Zurich, Switzerland, April wwwconceptlabscouk/alicebob.

@restrict('POST') @validate(schema=NewPageForm(), form='edit') def save(self, id=None): page_q = metaSessionquery(modelPage) page = page_qfilter_by(id=id)first() if page is None: abort(404) for k,v in selfform_resultitems(): if getattr(page, k) != v: setattr(page, k, v) metaSessioncommit() session['flash'] = 'Page successfully updated' sessionsave() # Issue an HTTP redirect responsestatus_int = 302 responseheaders['location'] = hurl_for(controller='page', action='view', I id=pageid) return "Moved temporarily" You could instead replace the last five lines to use redirect_to() like this: # Issue an HTTP redirect return redirect_to(controller='page', action='view', id=pageid) As you can see, this is much neater, so it is a good idea to use redirect_to() in your controllers rather than writing out the long version of the code redirect_to() is commonly used after a form submission to redirect to another URL so that if the user clicks Refresh, the form data isn t sent again.

Because the locking operation is atomic, the first thread will not be interrupted between the check and the locking, thus the second thread will check and find a locked mutex In Qt, mutexes are implemented by the QMutex class The methods for locking and unlocking are called lock and unlock Another method, tryLock, locks the mutex only if it is not owned by another thread By altering the application from Listings 12-1, 12-2, and 12-3, you can make sure that the "Foo" and "Bar" texts always appear in the same order Listing 12-5 shows the modified run method The added lines of code have been highlighted The added lines make sure that each thread holds the lock while printing the text and sleeping During this time, the other thread also calls lock and then blocks until the current holder unlocks the mutex.

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