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GaimBlistNode *child; GHashTable *settings; void *ui_data; GaimBlistNodeFlags flags; } This code represents a buddy list node A node can be any entry in the buddy list It could be a group, a buddy, a contact, or a chat struct _GaimBlistNode contains all the data common among all those types If you ve done object-oriented programming before, you re probably used to seeing object types like GaimBlistNode: one word, capitalized When doing object-oriented programming in C, you will use typedefs to achieve that same effect Rather than writing struct _GaimBlistNode everywhere you refer to this type, you can alias it to GaimBlistNode, matching the typical object-oriented syntax: typedef struct _GaimBlistNode GaimBlistNode; Alternately, you can usually add the typedef in the struct declaration itself Here, however, you cannot because the struct declaration contains references to itself You must then put the typedef before the struct declaration for the compiler to understand it.

It is also important for the Applications DBA to monitor the CPU usage of the servers. The threshold for CPU utilization is site specific, but a general rule of thumb for CPU usage is to keep the server at no less than 20 percent idle for an extended period of time. The following script will monitor CPU usage: #Script used to monitor server CPU utilization #Threshold is the maximum percentage of CPU utilization acceptable THRESHOLD=$1 TMPFILE=/tmp/tmp_cpu.txt LOGFILE=/tmp/cpu_utilization.log HOSTNAME=`hostname` vmstat 2 2 > $TMPFILE IDLE_TIME=`tail -1 $TMPFILE | awk '{ print $16 }'` if [ $IDLE_TIME -gt $THRESHOLD ] then exit 0

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The following is an example including the typedef in the struct declaration just so that you know the syntax: typedef struct foo { int value; char string[8]; } GaimFoo; Note that instead of BlistNode, we ve typedefed this object as GaimBlistNode Also, the struct is called struct _GaimBlistNode, with an underscore Because C lacks many of the features of object-oriented languages, some of these features are duplicated in naming conventions Calling the object a GaimBlistNode rather than just a BlistNode is an example of namespacing A namespace ensures that two separate classes of objects can have the same type It would be doubtful that any other code in Gaim has a buddy list node object, but other types certainly can overlap a conversation, for instance Gaim has its own representation of a conversation, but a library used to implement some protocol might also have its own representation of a conversation.

You can handle the first part fairly easily: you can set up your edit_snippet view to receive the id of the Snippet in the URL and to look it up in the database. Then you can compare the snippet s author field to the identity of the currently logged-in user to ensure that they match. So let s start by adding a couple more imports to cab/views/snippets.py: from django.shortcuts import get_object_or_404 from django.http import HttpResponseForbidden The HttpResponseForbidden class represents an HTTP response with the status code 403, which indicates that the user doesn t have permission to do whatever he was trying to do. You ll use it when someone tries to edit a snippet that he didn t originally submit. Here s the edit_snippet view: def edit_snippet(request, snippet_id): snippet = get_object_or_404(Snippet, pk=snippet_id) if request.user.id != snippet.author.id: return HttpResponseForbidden() if request.method == 'POST': form = SnippetForm(instance=snippet, data=request.POST) if form.is_valid(): snippet = form.save() return HttpResponseRedirect(snippet.get_absolute_url())

else echo "$HOSTNAME - Server CPU utilization High" > $LOGFILE exit 1 fi High CPU consumption is sometimes a symptom of underlying performance issues or a long running job. If your server experiences numerous periods of high CPU utilization, it is possible that additional processing power is required for the server. Additional information about tuning CPU consumption is provided in 4 of this guide.

Both objects cannot be simply Conversation, or they d conflict Namespaces resolve this problem For most object-oriented languages, a pair of colons is the common syntax, so you would see Gaim::Foo and Bar::FooHowever, because C doesn t support namespaces natively, they re done semantically by prepending the namespace to the beginning of classes of that type The underscore is another semantic duplication of a feature Many object-oriented languages have a private keyword, or something similar, that specifies that a data type is not to be used outside of the encapsulated object C doesn t have this, so the effect is achieved semantically Variables, functions, or data types prefixed with an underscore are considered private and should not be used There s nothing in C that can actually enforce this; it s just a rule you re expected to follow.

Now that you ve typedefed GaimBlistNode, to declare a GaimBlistNode object, merely do this: GaimBlistNode *node;.

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