December 2011
Intermediate to advanced
485 pages
15h 47m
English
Content preview from OS X and iOS Kernel Programming
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Handling Asynchronous Operations
As we will see in our later discussion of IOUSBLib classes, many methods perform operations that complete asynchronously. All such asynchronous methods take two parameters, a pointer to a callback function and a parameter named “refcon” that allows the application to pass an arbitrary context value to its callback. The callback function has the following signature:
void MyCallbackFunction (void* refcon, IOReturn result, void* arg0);
The first parameter, refcon, is the application's arbitrary context parameter. The second parameter reports the overall result of the operation; a value of kIOReturnSuccess indicates the operation completed successfully. The final argument, arg0, is provided by the IOUSBLib and ...
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