class abstractsemaphore

Abstract class to manage a semaphore.

Inheritance:

Public Fields

	rdlock read lock
	wrlock write lock

Public Methods

virtual	~abstractsemaphore () Default destructor.
virtual void	lock () Semaphore lock function.
virtual void	readlock () Semaphore lock function.
virtual void	writelock () Semaphore lock function.
virtual void	unlock () Semaphore unlock function.
virtual bool	trylock (locktype lck = rdlock) Semaphore trylock function.
virtual bool	trylock_timed (int timeout, locktype lck = rdlock) Semaphore trylock function.

Public

typedef enum

locktype type of lock

typedef enum locktype

type of lock

rdlock

read lock

wrlock

write lock

virtual ~abstractsemaphore()

Abstract virtual destructor.

Returns:

void

virtual void lock()

Locks the semaphore (abstract virtual method).

Returns:

void

virtual void readlock()

Locks the semaphore to allow read access (abstract virtual method).

Returns:

void

virtual void writelock()

Locks the semaphore to allow wrire access (abstract virtual method).

Returns:

void

virtual void unlock()

Unlocks the semaphore (abstract virtual method).

Returns:

void

virtual bool trylock(locktype lck = rdlock)

Tries to lock the semaphore (abstract virtual method). The return argument indicates whether the semaphore was successfully locked, or whether the semaphore was already taken by somebody else.

Returns:

true if semaphore locked

Parameters:

lck - Lock type

virtual bool trylock_timed(int timeout, locktype lck = rdlock)

Tries to lock the semaphore within the given time. The return argument indicates whether the semaphore was successfully locked, or whether the semaphore was already taken by somebody else. This routine will try to lock the mutex 11 times, sleeping 1/10 of the specified timeout everytime the lock fails.

Returns:

true if semaphore locked

Parameters:

timeout - Timeout in usec
lck - Lock type

Direct child classes:

readwritelock
mutex

Author:

DS, November 98

See Also:

Mutex objects

alphabetic index hierarchy of classes

Please send questions and comments to zweizig_j@ligo.caltech.edu

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