Context Switching
[System Support]

Collaboration diagram for Context Switching:

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Detailed Description

Context Switching for GNUARM.

This code should work with other GCC distributions for the ARM CPU.

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

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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.

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

Create a new thread. If the current thread's priority is lower or equal than the default priority (64), then the current thread is stopped and the new one is started. Parameters: name  String containing the symbolic name of the new thread, up to 8 characters long. fn  The thread's entry point, typically created by the THREAD macro. arg  Argument pointer passed to the new thread. stackSize  Number of bytes of the stack space allocated for the new thread. Note: The thread must run in ARM mode. Thumb mode is not supported. Returns: Pointer to the NUTTHREADINFO structure or 0 to indicate an error.

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