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An advertisement carries the identity of its station of origin A station advertising the FULL_RATE always identifies itself as the origin In all other cases, the origin is the station whose locally computed fairRate and source MAC address is carried by the advertisement The advertisement also carries a time to live field that is assigned the value 255 by the originating station and is decremented by each station through which it passes Stations receiving an advertisement can infer the originating station by examining the MAC address or the time to live fields Two methods of adjusting the fairRate are defined: Aggressive and Conservative Aggressive The Aggressive method provides responsive adjustments that favor utilization of capacity over rate stability The rates can be changed without significant delay and amounts of rate change are not highly damped Stations transition immediately to the uncongested state after the congestion conditions are removed The aggressive method is the simpler of the two Conservative The conservative method differs from the aggressive method in that a station can remain in a congested state after the congestion conditions are removed This provides hysteresis in the transition between congested and uncongested states and prevents rate oscillation In most cases, the conservative method requires that the fairRate not be adjusted until sufficient time has passed to ensure that the effect of any previous adjustment has been observed This waiting period is known as the fairness round trip time (FRTT) The FRTT is computed only by a station that performs conservative rate computation and is the head of a congestion domain (the station generating the advertisement) The FRTT value is recomputed when a valid pair of fairness differential delay (FDD) frames from the tail station (the last station advertising the fairRate generated by the head station) has been received by the head station The FDD pair is sent by the tail at regular intervals The head station estimates the FRTT by referencing the FDD and the loop round trip time (LRTT) FRTT is the sum of FDD and LRTT FRTT = FDD + LRTT FDD is a measure of the difference in delay between the classA and classC paths from the tail station to the head station, as shown in Figure 129 Stations are requested to generate the FDD frames only if they are a tail of a congestion domain whose head station is deploying the Conservative method LRTT is a measure of link delay experienced by classA frames from the head of the congestion domain to the tail of the congestion domain and back A station implementing the Conservative method sends LRTT request frames to each station in the ring at regular intervals; each station in the ring (regardless of the fairness method being deployed by such station) returns a LRTT response frame for each LRTT request frame received LRTT values are maintained in each station implementing the conservative method for each station in the ring.

The prototype for atexit( ) is in <stdlibh> The atexit( ) function establishes the function pointed to by func as the function to be called upon normal program termination That is, the specified function is called at the end of a program run The act of establishing the function is referred to as registration The atexit( ) function returns 0 if the function is registered as the termination function, and non-0 otherwise Up to 32 termination functions can be established They are called in the reverse order of their establishment: first in, last out

This program prints Hello there! on the screen:

The XAML designer By far the most important WPF tool in Visual Studio 2008 is the XAML designer the combination control that lets you edit XAML directly or the visual representation of that XAML. Figure 2.12 shows the designer. When the designer comes up, it defaults to show two different panes: the Design pane and the XAML pane.

#include <stdioh> #include <stdlibh> /* Example using atexit() */ int main(void) { void done(); if(atexit(done)) printf("Error in atexit()"); return 0; } void done() { printf("Hello there!"); }

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exit( ), abort( )

The Design pane shows the visual representation of a XAML file and automatically changes to reflect any changes to the raw XAML. It s fully interactive, so you can drag elements from the Toolbox. It s also synchronized with the XAML pane, so if you select something in the Design pane, it s automatically selected in XAML, and vice versa. One issue with the Design pane is that it only renders legal XAML. If you break the XAML, you ll either get a message at the top of the screen telling you that your