Scheduling

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 #include <cio/sched.h> 

Data Structures
struct	cio_context
	Buffer for saving stack and register state. More...
Defines
#define	CIO_INPUT
	File descriptor may be read from.
#define	CIO_OUTPUT
	File descriptor may be written to.
#define	CIO_ERROR
	Error while waiting for I/O.
#define	CIO_HANGUP
	Hang-up while waiting for I/O.
#define	CIO_CLOSE
	File descriptor was closed while waiting for I/O.
Functions
int	cio_wait (int fd, int events)
int	cio_yield (struct cio_context *storage)
void	cio_run (struct cio_context *target, int value)

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Function Documentation

void cio_run	(	struct cio_context *	target,
		int	value
	)

Jump to another routine immediately.

Parameters:

	target	execution context to be resumed
	value	to be returned by the cio_yield() call in the target routine (must be greater than zero)

int cio_wait	(	int	fd,
		int	events
	)

Wait for I/O events on a file descriptor.

Parameters:

	fd	a file descriptor which supports polling
	events	bitwise OR of CIO_INPUT and/or CIO_OUTPUT

Returns:

the I/O events (bitwise OR of CIO_INPUT, CIO_OUTPUT, CIO_ERROR, CIO_HANGUP and/or CIO_CLOSE) which caused the execution to resume

Return values:

-1

on error with errno set

int cio_yield

(

struct cio_context *

storage

)

Save current execution context and schedule the next routine. This function returns after an I/O event subscribed to with cio_register() occurs or another routine calls cio_run() with the execution context stored here.

Parameters:

storage

for saving the stack and register state until execution is resumed

Returns:

the I/O events (bitwise OR of CIO_INPUT, CIO_OUTPUT, CIO_ERROR and/or CIO_HANGUP) which caused the execution to resume if cio_register() was used; or

the value passed to cio_run() if it was used

Return values:

-1

on interrupt with errno set