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for K_a to K_z, you may expect there to be equivalent uppercase versions but there aren t any. The reason for this is that capital letters are the result of combining keys together (Shift + key). If you need to detect capital letters, or other Shifted keys, use the unicode parameter in key events that contain the result of such key combinations. We can use the pygame.key.get_pressed function to detect whether a key is pressed. It returns a list of booleans (True or False values), one for each of the key constants. To look up a particular key, use its constant as an index into the pressed list. For example, if we were using the spacebar as a fire button, we might write the trigger code like this: pressed_keys = pygame.key.get_pressed() if pressed_keys[K_SPACE]: # Space key has been pressed fire() Let s write a script to experiment with the keyboard. Listing 6-1 uses the get_pressed function to detect any pressed keys and displays a list of them on the screen.

There has been a tremendous amount of work to make Linux a soft real-time system. The current project embodying this work is the CONFIG_PREEMPT_RT patch available at http://rt.wiki.kernel.org. This project first focused on reducing the latency in the Linux kernel by making it more preemptable. When the Linux kernel was first ported to a multiprocessor system (that is, a machine that could execute more than one thread of code concurrently), the kernel s race conditions were solved by using a single lock called the Big Kernel Lock (BKL); this resulted in serialization throughout the kernel, because many unrelated routines used this lock to quell race conditions. The result was that some code waited for resources that weren t necessarily used by the lock elsewhere. In addition to lacking granularity, the BKL was a spinlock, meaning the code requesting the lock waited in a loop: the process waiting for the next lock wouldn t yield, resulting in a system that couldn t be scheduled in a real-time sense. Preemption is vital to real-time systems. Interruption is necessary to meet deadlines if a lowerpriority task is monopolizing resource that a higher-priority task needs or when the lock is taking time while the processor could be doing some other activity. This project includes more than just preemption:

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screen and that you do not use the Shut Down button from the Settings menu; otherwise, you will shut down your Windows Home Server and lose your Remote Access facilities until such time as you can power back up the Windows Home Server.

High-resolution timers: This part of the patch has been recently accepted into the mainline kernel. High-resolution timers are frequently a requirement in a realtime system when a task needs to occur more frequently than the 1 millisecond resolution offered with Linux. A working high-resolution timer, however, depends on a platform that has a dependable high-resolution clock. Not all processors have the required hardware, or the clock itself may have enough jitter that it isn t useful for a timing-sensitive application. Priority inheritance mutexes: A mutex (short for mutually exclusive) is a lock put around code so that only one thread can execute that code at a time. The enclosed code is called a critical section. Mutexes that have priority inheritance reduce the amount of time in a priority inversion, because when a thread with a lower priority is waiting to run the critical section, the thread holding the mutex runs at the priority of the waiting thread.

Listing 6-1. Testing Pressed Keys (keydemo.py) import pygame from pygame.locals import * from sys import exit pygame.init() screen = pygame.display.set_mode((640, 480), 0, 32) font = pygame.font.SysFont("arial", 32); font_height = font.get_linesize() while True: for event in pygame.event.get(): if event.type == QUIT: exit() screen.fill((255, 255, 255)) pressed_key_text = [] pressed_keys = pygame.key.get_pressed() y = font_height

As mentioned earlier, you can connect to one of your home computers and use it as though you were sitting in front of it. Therefore, you can start an application, print something, and pretty much do anything you could do if you were sitting in front of it at home.

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