semaphore.h File Reference

Thread subsystem IV. More...

#include <gctypes.h>

Macros
#define	LWP_SEM_NULL   0xffffffff

Typedefs
typedef u32	sem_t
	typedef for the semaphore handle

Functions
s32	LWP_SemDestroy (sem_t sem)
	Close and destroy a semaphore, release all threads and handles locked on this semaphore. More...
s32	LWP_SemGetValue (sem_t sem, u32 *value)
	return the current semaphore count More...
s32	LWP_SemInit (sem_t *sem, u32 start, u32 max)
	Initializes a semaphore. More...
s32	LWP_SemPost (sem_t sem)
	Count up semaphore counter and release lock if counter >0. More...
s32	LWP_SemWait (sem_t sem)
	Count down semaphore counter and enter lock if counter <=0. More...

Detailed Description

Thread subsystem IV.

Function Documentation

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

LWP_SemGetValue()

s32 LWP_SemGetValue	(	sem_t	sem,
		u32 *	value
	)

return the current semaphore count

Parameters

[in]	sem	handle to the sem_t structure.
[out]	the	current value of the semaphore

Returns

0 on success, <0 on error

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

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

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