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thread_count++; thread_created++; if (thread_count-delayed_insert_threads > max_used_connections) max_used_connections=thread_count-delayed_insert_threads; DBUG_PRINT("info",(("creating thread %d"), thd->thread_id)); pthread_create(&thd->real_id,&connection_attrib, \ handle_one_connection, (void*) thd)) (void) pthread_mutex_unlock(&LOCK_thread_count); } DBUG_PRINT("info",("Thread created")); } In this function, we ve highlighted some important activity You see firsthand how the resource subsystem locks the LOCK_thread_count resource using pthread_mutex_lock() This is crucial, since the thread_count and thread_created variables are modified (incremented) during the function s execution thread_count and thread_created are global variables shared by all threads executing in the server process The lock created by pthread_mutex_lock() prevents any other threads from modifying their contents while create_new_thread() executes This is a great example of the work of the resource management subsystem Secondly, we highlighted start_cached_thread() to show you where the connection thread pooling mechanism kicks in.

EnvironmentDeviceType == MicrosoftDevicesDeviceTypeDevice) { AccelerometerData = new Vector3((float)eX, (float)eY, (float)eZ); } else { // Use the touch screen to simulate the accelerometer float x, y; TouchCollection touches; touches = TouchPanelGetState(); if (touchesCount > 0) { x = (touches[0]PositionX - WindowClientBoundsWidth / 2) / (WindowClientBoundsWidth / 2); y = -(touches[0]PositionY - WindowClientBoundsHeight / 2) / (WindowClientBoundsHeight / 2); AccelerometerData = new Vector3(x, y, 0);.

Lastly, and most important, pthread_create(), part of the thread function library, creates a new thread with the THD->real_id member variable and passes a function pointer for the handle_one_connection() function, which handles the creation of a single connection This function is implemented in the parsing library, in /sql/sql_parsecc, as shown in Listing 4-11 Listing 4-11 /sql/sql_parsecc handle_one_connection() handle_one_connection(THD *thd) { while (!net->error && net->vio != 0 && !(thd->killed == THD::KILL_CONNECTION)) { if (do_command(thd)) break; } } We ve removed most of this function s code for brevity The rest of the function focuses on initializing the THD struct for the session We highlighted two parts of the code listing within the function definition First, we ve made the net->error check bold to highlight the fact that the THD->net member variable struct is being used in the loop condition.

Figure 2-12. Axes in Java 3D If a cell is positioned using only the i, j, and k values, it would be located too close to the viewer, too far to the right, and too far up. The subtraction of GRID_LEN/2 moves the cell back toward a central region around the origin.

} } } This code provides an intuitive method for providing simulated accelerometer data, but has the problem that it requires touch screen interaction, which could interfere with other parts of your game that rely on the touch screen The second method avoids this problem by using the keyboard cursor keys They are much less likely to be used in a game and so reduce the likelihood of interference The problem with using the cursor keys like this is that it is much harder to keep track of which way the simulated accelerometer vector is pointing For this reason it is very useful to add a text object to the game and use it to display the content of the AccelerometerData property on the screen You can then refer to this in order to get your bearings The keyboard-based simulation code is shown in Listing 4 29 Listing 4 29.

This must mean that do_command() must be sending and receiving packets, right net is simply a pointer to the THD->net member variable, which is the main structure for handling client/server communications, as we noted in the earlier section on the network subsystem So, the main thing going on in handle_one_connection() is the call to do_command(), which we ll look at next in Listing 4-12..

CHAPTER 2 s GET A LIFE (IN 3D)

Simulating the accelerometer using touch keyboard input void AccelerometerReadingChanged(object sender, AccelerometerReadingEventArgs e) { if (MicrosoftDevicesEnvironmentDeviceType == MicrosoftDevicesDeviceTypeDevice) { AccelerometerData = new Vector3((float)eX, (float)eY, (float)eZ); } else { // Use the cursor keys on the keyboard to simulate the accelerometer Vector3 accData = AccelerometerData; if (KeyboardGetState()IsKeyDown(KeysLeft)) accDataX -= 005f; if (KeyboardGetState()IsKeyDown(KeysRight)) accDataX += 005f; if (KeyboardGetState()IsKeyDown(KeysUp)) accDataY += 005f; if (KeyboardGetState()IsKeyDown(KeysDown)) accDataY -= 005f; // Ensure that the data stays within valid bounds of -1 to 1 on each axis accDataX = MathHelperClamp(accDataX, -1, 1); accDataY = MathHelperClamp(accDataY, -1, 1); // Put the vector back into the AccelerometerData property AccelerometerData = accData; } // Display the accelerometer data in a text object _accText.