semaphore.c File Reference

#include <stdlib.h>
#include <errno.h>
#include <asm.h>
#include "lwp_sema.h"
#include "lwp_objmgr.h"
#include "lwp_config.h"
#include "semaphore.h"

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Classes
struct	_sema_st

Macros
#define	LWP_OBJTYPE_SEM   4
#define	LWP_CHECK_SEM(hndl)

Typedefs
typedef struct _sema_st	sema_st

Functions
void	__lwp_sema_init ()
static __inline__ sema_st *	__lwp_sema_open (sem_t sem)
static __inline__ void	__lwp_sema_free (sema_st *sema)
static sema_st *	__lwp_sema_allocate ()
s32	LWP_SemInit (sem_t *sem, u32 start, u32 max)
	Initializes a semaphore. More...
s32	LWP_SemWait (sem_t sem)
	Count down semaphore counter and enter lock if counter <=0. More...
s32	LWP_SemPost (sem_t sem)
	Count up semaphore counter and release lock if counter >0. More...
s32	LWP_SemDestroy (sem_t sem)
	Close and destroy a semaphore, release all threads and handles locked on this semaphore. More...

Variables
lwp_objinfo	_lwp_sema_objects

Macro Definition Documentation

LWP_CHECK_SEM

#define LWP_CHECK_SEM

(

hndl

)

Value:

{ \
 if(((hndl)==LWP_SEM_NULL) || (LWP_OBJTYPE(hndl)!=LWP_OBJTYPE_SEM)) \
 return NULL; \
}

LWP_OBJTYPE_SEM

#define LWP_OBJTYPE_SEM   4

Typedef Documentation

sema_st

typedef struct _sema_st sema_st

Function Documentation

__lwp_sema_allocate()

static sema_st* __lwp_sema_allocate ( )

static

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__lwp_sema_free()

static __inline__ void __lwp_sema_free ( sema_st *  sema )

static

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__lwp_sema_init()

void __lwp_sema_init

(

void

)

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__lwp_sema_open()

static __inline__ sema_st* __lwp_sema_open ( sem_t  sem )

static

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LWP_SemDestroy()

s32 LWP_SemDestroy

(

sem_t

sem

)

Close and destroy a semaphore, release all threads and handles locked on this semaphore.

Parameters

[in]

sem

handle to the sem_t structure.

Returns

0 on success, <0 on error

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LWP_SemInit()

s32 LWP_SemInit	(	sem_t *	sem,
		u32	start,
		u32	max
	)

Initializes a semaphore.

Parameters

[out]	sem	pointer to a sem_t handle.
[in]	start	start count of the semaphore
[in]	max	maximum count of the semaphore

Returns

0 on success, <0 on error

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LWP_SemPost()

s32 LWP_SemPost

(

sem_t

sem

)

Count up semaphore counter and release lock if counter >0.

Parameters

[in]

sem

handle to the sem_t structure.

Returns

0 on success, <0 on error

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LWP_SemWait()

s32 LWP_SemWait

(

sem_t

sem

)

Count down semaphore counter and enter lock if counter <=0.

Parameters

[in]

sem

handle to the sem_t structure.

Returns

0 on success, <0 on error

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Variable Documentation

_lwp_sema_objects

lwp_objinfo _lwp_sema_objects