KThread

class KThread extends KSynchronizationObject, KTimeableInterruptEvent, KSendableInterruptEvent and KSchedulableInterruptEvent;

Size : 0xB0 bytes

Offset	Type	Description
0x0	u32	Pointer to vtable
0x4	u32	Reference count
0x8	u32	Count of KThreads that sync with this object - number of nodes in the linked list below
0xC	KLinkedListNode*	Pointer to first KLinkedListNode in node list of KThreads that sync with this object
0x10	KLinkedListNode*	Pointer to last KLinkedListNode in node list of KThreads that sync with this object
0x14	KTimeableInterruptEvent	Used to suspend threads (*this)
0x24	KSendableInterruptEvent	Interrupt event (*this) sent to terminate a thread, except in the case just below
0x2C	KSchedulableInterruptEvent	Interrupt event (*this) scheduled by the IRQ handler when the thread should terminate (*this)
0x34	u8	Whether the thread is in the scheduler's queue and is ready to run
0x35	u8	Used in syncing
0x36	s8	Indicates that the thread shall terminate
0x37	u8	Used in syncing
0x38	KDebugThread*	Pointer to KDebugThread object used with the current KThread
0x3C	u32	Base thread priority
0x40	u32	Pointer to object the KThread is waiting on- can be a timer, event, session, etc.
0x44	Result	Status for object above
0x48	KObjectMutex*	Locking kernel mutex
0x4C	u32	Arbitration address
0x50	KLinkedListNode*	Pointer to first KLinkedListNode in node list of objects this thread is waiting on
0x54	KLinkedListNode*	Pointer to last KLinkedListNode in node list of objects this thread is
0x5C	KMutexLinkedList *	Set in some very specific circumstances
0x60	u32	Count of KMutex objects this thread is using
0x64	KLinkedListNode*	Pointer to first KLinkedListNode in node list of KMutex objects this thread is using
0x68	KLinkedListNode*	Pointer to last KLinkedListNode in node list of KMutex objects this thread is using
0x6C	s32	Dynamic thread priority
0x70	s32	Processor that created the thread
0x74	KPreemptionTimer *	Points to KResourceLimit+0x60, which among other things holds the amount of CPU time available in ticks, or NULL
0x7C	u8	?
0x7D	u8	?
0x7E	u8	Thread affinity mask - set differently depending on whether the thread is created via svc call or from inside the kernel
0x80	KProcess*	Process the thread belongs to (virtual address)
0x84	u32	Thread id
0x88	u32*	Ptr to svc mode register storage for KThread inside the thread context.
0x8C	u32*	End-address of the page for this thread context allocated in the 0xFF4XX000 region. Thus, if the beginning of this mapped page is 0xFF401000, this ptr would be 0xFF402000. Thread context page - used for thread svc stack, preserving svc mode registers and VFP exception register for thread.
0x90	s32	Ideal processor (processorid value from svcCreateThread)
0x94	void*	Ptr to Thread Local Storage
0x98	void*	Ptr to Thread Local Storage in FCRAM via kernel vmem
0xA0	KThreadLinkedListNode	Previous and next scheduled threads
0xA8	KThreadLinkedList *	Pointer to linked list of scheduled threads that has stolen it, or 0 if in normal list
0xAC	s32	Priority field used for priority inheritance when needed

With the following declarations: struct KThreadLinkedList { KThread *first, *last; }; and struct KThreadLinkedListNode { KThread *prev, *next; };.

Thread Affinity Mask

If the thread is created via a call to SVC 8(CreateThread), which uses thread creation type 3, and the CPU ID is -2(meaning use the core specified in the exheader), the mask is just the affinity mask from the thread's owner KProcess. If the CPU ID is -1(meaning any core), the affinity mask is set to 0xF on the New3DS and 0x3 on the Old3DS. Otherwise, the affinity mask is (1 << cpu_id) | 1.

If the thread is created via a call by the kernel, which uses thread creation types 0-2, the checks for -1 and -2 are skipped and the mask is always (1 << cpu_id) | 1.