Spinlock with preemption deactivation

Collaboration diagram for Spinlock with preemption deactivation:

Macros
#define	RTDM_LOCK_UNLOCKED(__name)   IPIPE_SPIN_LOCK_UNLOCKED
	Static lock initialisation.
#define	rtdm_lock_get_irqsave(__lock, __context)   ((__context) = __rtdm_lock_get_irqsave(__lock))
	Acquire lock and disable preemption, by stalling the head domain. More...
#define	rtdm_lock_irqsave(__context)   splhigh(__context)
	Disable preemption locally. More...
#define	rtdm_lock_irqrestore(__context)   splexit(__context)
	Restore preemption state. More...

Typedefs
typedef ipipe_spinlock_t	rtdm_lock_t
	Lock variable.
typedef unsigned long	rtdm_lockctx_t
	Variable to save the context while holding a lock.

Functions
static void	rtdm_lock_init (rtdm_lock_t *lock)
	Dynamic lock initialisation. More...
static void	rtdm_lock_get (rtdm_lock_t *lock)
	Acquire lock from non-preemptible contexts. More...
static void	rtdm_lock_put (rtdm_lock_t *lock)
	Release lock without preemption restoration. More...
static void	rtdm_lock_put_irqrestore (rtdm_lock_t *lock, rtdm_lockctx_t context)
	Release lock and restore preemption state. More...

Detailed Description

Macro Definition Documentation

rtdm_lock_get_irqsave

#define rtdm_lock_get_irqsave	(		__lock,
			__context
	)		((__context) = __rtdm_lock_get_irqsave(__lock))

Acquire lock and disable preemption, by stalling the head domain.

Parameters

__lock	Address of lock variable
__context	name of local variable to store the context in

Tags

unrestricted

Referenced by rtdm_ratelimit().

rtdm_lock_irqrestore

#define rtdm_lock_irqrestore

(

__context

)

splexit(__context)

Restore preemption state.

Parameters

__context

name of local variable which stored the context

Tags

unrestricted

rtdm_lock_irqsave

#define rtdm_lock_irqsave

(

__context

)

splhigh(__context)

Disable preemption locally.

Parameters

__context

name of local variable to store the context in

Tags

unrestricted

Function Documentation

rtdm_lock_get()

static void rtdm_lock_get ( rtdm_lock_t *  lock )

inlinestatic

Acquire lock from non-preemptible contexts.

Parameters

lock	Address of lock variable

Tags

unrestricted

References spltest.

rtdm_lock_init()

static void rtdm_lock_init ( rtdm_lock_t *  lock )

inlinestatic

Dynamic lock initialisation.

Parameters

lock	Address of lock variable

Tags

task-unrestricted

rtdm_lock_put()

static void rtdm_lock_put ( rtdm_lock_t *  lock )

inlinestatic

Release lock without preemption restoration.

Parameters

lock	Address of lock variable

Tags

unrestricted, might-switch

rtdm_lock_put_irqrestore()

static void rtdm_lock_put_irqrestore ( rtdm_lock_t *  lock, rtdm_lockctx_t  context  )

inlinestatic

Release lock and restore preemption state.

Parameters

lock	Address of lock variable
context	name of local variable which stored the context

Tags

unrestricted

Referenced by rtdm_ratelimit().