Size : 0x14 bytes
There are only two instances of this class. The first mailbox contains pointers to KProcess instances (viewed as KSendableInterruptEvent), and its handling thread has a priority of 0; whereas the second mailbox contains pointers to KThread instances (viewed as KSendableInterruptEvent), and DMA-related interrupt events, and its handling thread has a priority of 16.
The handling thread executes the handler function, i.e. the first virtual function (then removes the interrupt event from the list) of all the KSendableInterruptEvent instances the mailbox contains. When that list is empty, it sets the mailbox's "is busy" flag and unschedules itself.
|0x4||KSendableInterruptEvent *||First interrupt event|
|0x8||KSendableInterruptEvent *||Last interrupt event|
|0xC||u8||Mailbox is busy (and not empty)|
|0x10||KThread * const||Kernel thread handling this object|