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PATH Hardware Documentation
> USB Devices
> Mac OS USB DDK API Reference
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The memory functions allow USB class drivers to allocate and deallocate memory. Since memory allocation must typically occur at task time, the memory functions will queue the request until task time is available, then allocate the memory and return asynchronously. These functions are the preferred way of specifying memory requirements, because they relieve the class driver from monitoring execution levels when performing memory management functions.
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