lock_pt.c File Reference

#include <pthread.h>
#include <assert.h>
#include <lwp/lwp.h>
#include <lwp/lock.h>
#include "lwp.private_pt.h"

Include dependency graph for lock_pt.c:

Functions
void	Lock_Init (struct Lock *lock)
void	ObtainReadLock (struct Lock *lock)
void	ObtainWriteLock (struct Lock *lock)
void	ObtainSharedLock (struct Lock *lock)
void	ReleaseReadLock (struct Lock *lock)
void	ReleaseWriteLock (struct Lock *lock)
void	ReleaseSharedLock (struct Lock *lock)
int	CheckLock (struct Lock *lock)
int	WriteLocked (struct Lock *lock)

Function Documentation

CheckLock()

int CheckLock

(

struct Lock *

lock

)

Check the status of the lock

Parameters

lock	pointer to the lock

Returns

0 ff the lock is not acquired. If the lock is currently acquired for reading returns the amount of readers. And -1 if the lock is acquired obtained for writing or as a shared lock.

Lock_Init()

void Lock_Init

(

struct Lock *

lock

)

Initialize the Lock structure

Parameters

lock	pointer to the lock

ObtainReadLock()

void ObtainReadLock

(

struct Lock *

lock

)

Obtain the lock for reading

Parameters

lock	pointer to the lock

ObtainSharedLock()

void ObtainSharedLock

(

struct Lock *

lock

)

Obtain the lock as shared lock

Parameters

lock	pointer to the lock

ObtainWriteLock()

void ObtainWriteLock

(

struct Lock *

lock

)

Obtain the lock for writing

Parameters

lock	pointer to the lock

ReleaseReadLock()

void ReleaseReadLock

(

struct Lock *

lock

)

Release the lock obtained for reading

Parameters

lock	pointer to the lock

ReleaseSharedLock()

void ReleaseSharedLock

(

struct Lock *

lock

)

Release the lock obtained as a shared lock

Parameters

lock	pointer to the lock

ReleaseWriteLock()

void ReleaseWriteLock

(

struct Lock *

lock

)

Release the lock obtained for writing

Parameters

lock	pointer to the lock

WriteLocked()

int WriteLocked

(

struct Lock *

lock

)

Check if the lock was acquired for reading

Parameters

lock	pointer to the lock

Returns

true (different than zero) if the lock is currently acquired for writing or as a shared lock. 0 otherwise.