# ACE_Guard< ACE_LOCK > Class Template Reference

This data structure is meant to be used within a method or function... It performs automatic aquisition and release of a parameterized synchronization object <ace_lock>. More...

`#include <Guard_T.h>`

Inheritance diagram for ACE_Guard< ACE_LOCK >:

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Collaboration diagram for ACE_Guard< ACE_LOCK >:

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List of all members.

## Public Member Functions

| ACE_Guard (ACE_LOCK &l)
| ACE_Guard (ACE_LOCK &l, int block)
| ACE_Guard (ACE_LOCK &l, int block, int become_owner)
| ~ACE_Guard (void)
| Implicitly release the lock.
int | acquire (void)
| Explicitly acquire the lock.
int | tryacquire (void)
| Conditionally acquire the lock (i.e., won't block).
int | release (void)
| Explicitly release the lock, but only if it is held!
void | disown (void)
int | locked (void) const
int | remove (void)
| Explicitly remove the lock.
void | dump (void) const
| Dump the state of an object.

## Protected Member Functions

| ACE_Guard (ACE_LOCK *lock)
| Helper, meant for subclass only.

## Protected Attributes

ACE_LOCK * | lock_
| Pointer to the ACE_LOCK we're guarding.
int | owner_
| Keeps track of whether we acquired the lock or failed.

## Private Member Functions

void | operator= (const ACE_Guard< ACE_LOCK > &)
| ACE_Guard (const ACE_Guard< ACE_LOCK > &)

## Detailed Description

### template<class ACE_LOCK>
class ACE_Guard< ACE_LOCK >

This data structure is meant to be used within a method or function... It performs automatic aquisition and release of a parameterized synchronization object <ace_lock>.

The <ace_lock> class given as an actual parameter must provide at the very least the <acquire>, <tryacquire>, <release>, and <remove> methods.

## Constructor & Destructor Documentation

template<class ACE_LOCK>
ACE_INLINE ACE_Guard< ACE_LOCK >::ACE_Guard | ( | ACE_LOCK & | l | ) |

template<class ACE_LOCK>
ACE_INLINE ACE_Guard< ACE_LOCK >::ACE_Guard | ( | ACE_LOCK & | l,
|  | int | block
| ) |

| Implicitly and automatically acquire (or try to acquire) the lock. If block is non-0 then <acquire> the <ace_lock>, else <tryacquire> it.

template<class ACE_LOCK>
ACE_INLINE ACE_Guard< ACE_LOCK >::ACE_Guard | ( | ACE_LOCK & | l,
|  | int | block,
|  | int | become_owner
| ) |

| Initialise the guard without implicitly acquiring the lock. The <become_owner> parameter indicates whether the guard should release the lock implicitly on destruction. The <block> parameter is ignored and is used here to disambiguate with the preceding constructor.

template<class ACE_LOCK>
ACE_INLINE ACE_Guard< ACE_LOCK >::~ACE_Guard | ( | void |  | ) |

| Implicitly release the lock.

template<class ACE_LOCK>
ACE_Guard< ACE_LOCK >::ACE_Guard | ( | ACE_LOCK * | lock | ) | `[inline, protected]`

| Helper, meant for subclass only.

template<class ACE_LOCK>
ACE_Guard< ACE_LOCK >::ACE_Guard | ( | const ACE_Guard< ACE_LOCK > & |  | ) | `[private]`

## Member Function Documentation

template<class ACE_LOCK>
ACE_BEGIN_VERSIONED_NAMESPACE_DECL ACE_INLINE int ACE_Guard< ACE_LOCK >::acquire | ( | void |  | ) |

| Explicitly acquire the lock. Reimplemented in ACE_Write_Guard< ACE_LOCK >, and ACE_Read_Guard< ACE_LOCK >.

template<class ACE_LOCK>
ACE_INLINE void ACE_Guard< ACE_LOCK >::disown | ( | void |  | ) |

| Relinquish ownership of the lock so that it is not released implicitly in the destructor.

template<class ACE_LOCK>
ACE_BEGIN_VERSIONED_NAMESPACE_DECL void ACE_Guard< ACE_LOCK >::dump | ( | void |  | ) | const

| Dump the state of an object. Reimplemented in ACE_Write_Guard< ACE_LOCK >, and ACE_Read_Guard< ACE_LOCK >.

template<class ACE_LOCK>
ACE_INLINE int ACE_Guard< ACE_LOCK >::locked | ( | void |  | ) | const

| 1 if locked, 0 if couldn't acquire the lock (errno will contain the reason for this).

template<class ACE_LOCK>
void ACE_Guard< ACE_LOCK >::operator= | ( | const ACE_Guard< ACE_LOCK > & |  | ) | `[private]`

template<class ACE_LOCK>
ACE_INLINE int ACE_Guard< ACE_LOCK >::release | ( | void |  | ) |

| Explicitly release the lock, but only if it is held!

template<class ACE_LOCK>
ACE_INLINE int ACE_Guard< ACE_LOCK >::remove | ( | void |  | ) |

| Explicitly remove the lock.

template<class ACE_LOCK>
ACE_INLINE int ACE_Guard< ACE_LOCK >::tryacquire | ( | void |  | ) |

| Conditionally acquire the lock (i.e., won't block). Reimplemented in ACE_Write_Guard< ACE_LOCK >, and ACE_Read_Guard< ACE_LOCK >.

## Member Data Documentation

template<class ACE_LOCK>
ACE_LOCK* ACE_Guard< ACE_LOCK >::lock_ `[protected]`

| Pointer to the ACE_LOCK we're guarding.

template<class ACE_LOCK>
int ACE_Guard< ACE_LOCK >::owner_ `[protected]`

| Keeps track of whether we acquired the lock or failed.

The documentation for this class was generated from the following files:

- Guard_T.h
- Guard_T.cpp
- Guard_T.inl