ImageCraft Context Switching for AVR CPUs

Thread context switching for ImageCraft ICCAVR. More...

Collaboration diagram for ImageCraft Context Switching for AVR CPUs:

Data Structures
struct	SWITCHFRAME
	ARM7TDMI GCC context switch frame layout. More...
struct	ENTERFRAME
	Thread entry frame layout. More...
Functions
void	NutThreadSwitch (void)
	Switch to another thread.
HANDLE	NutThreadCreate (uint8_t *name, void(*fn)(void *), void *arg, size_t stackSize)

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Detailed Description

Thread context switching for ImageCraft ICCAVR.

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Function Documentation

void NutThreadSwitch

(

void

)

Switch to another thread.

Stop the current thread, saving its context. Then start the one with the highest priority, which is ready to run.

Application programs typically do not call this function.

Note:

CPU interrupts must be disabled before calling this function.

References runningThread, runQueue, _NUTTHREADINFO::td_sp, _NUTTHREADINFO::td_state, and TDS_RUNNING.

HANDLE NutThreadCreate	(	uint8_t *	name,
		void(*)(void *)	fn,
		void *	arg,
		size_t	stackSize
	)

References __os_trf, __os_trs, ENTERFRAME::cef_arghi, ENTERFRAME::cef_arglo, ENTERFRAME::cef_pchi, ENTERFRAME::cef_pclo, ENTERFRAME::cef_r1, ENTERFRAME::cef_rampz, ENTERFRAME::cef_sreg, ENTERFRAME::cef_yhi, ENTERFRAME::cef_ylo, SWITCHFRAME::csf_pchi, SWITCHFRAME::csf_pclo, DEADBEEF, fprintf(), memcpy(), NutDumpThreadList(), NutEnterCritical, NutExitCritical, NutStackAlloc, NutThreadAddPriQueue(), nutThreadList, NutThreadSwitch(), runningThread, runQueue, _NUTTHREADINFO::td_memory, _NUTTHREADINFO::td_name, _NUTTHREADINFO::td_next, _NUTTHREADINFO::td_priority, _NUTTHREADINFO::td_queue, _NUTTHREADINFO::td_sp, _NUTTHREADINFO::td_state, _NUTTHREADINFO::td_timer, and TDS_READY.

Here is the call graph for this function: