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ACE_RW_Process_Mutex Class Reference

Wrapper for readers/writer locks that exist across processes. More...

#include <RW_Process_Mutex.h>

Collaboration diagram for ACE_RW_Process_Mutex:

[legend]List of all members.

Public Methods
	ACE_RW_Process_Mutex (const ACE_TCHAR *name=0, int flags=O_CREAT|O_RDWR)
	~ACE_RW_Process_Mutex (void)
int	remove (void)
int	acquire (void)
	Acquire lock ownership (wait on queue if necessary).
int	tryacquire (void)
int	release (void)
	Release lock and unblock a thread at head of queue.
int	acquire_read (void)
	Acquire lock ownership (wait on queue if necessary).
int	acquire_write (void)
	Acquire lock ownership (wait on queue if necessary).
int	tryacquire_read (void)
int	tryacquire_write (void)
int	tryacquire_write_upgrade (void)
const ACE_File_Lock &	lock (void) const
	Return the underlying lock.
void	dump (void) const
	Dump the state of an object.
Public Attributes
	ACE_ALLOC_HOOK_DECLARE
	Declare the dynamic allocation hooks.
Private Methods
const ACE_TCHAR *	unique_name (void)
	Create and return the unique name.
Private Attributes
ACE_TCHAR	name_ [ACE_UNIQUE_NAME_LEN]
ACE_File_Lock	lock_
	We need this to get the readers/writer semantics...

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Detailed Description

Wrapper for readers/writer locks that exist across processes.

Note that because this class uses the <ACE_File_Lock> as its implementation it only can be reliably used between separate processes, rather than threads in the same process. This isn't a limitation of ACE, it's simply the file lock semantics on UNIX and Win32.

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Constructor & Destructor Documentation

ACE_RW_Process_Mutex::ACE_RW_Process_Mutex (  const ACE_TCHAR *    name = 0, int    flags = O_CREAT|O_RDWR )

Create a readers/writer <Process_Mutex>, passing in the optional <name>. If not specified, a name is generated.

ACE_RW_Process_Mutex::~ACE_RW_Process_Mutex (  void    )

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Member Function Documentation

ACE_INLINE int ACE_RW_Process_Mutex::acquire (  void    )

Acquire lock ownership (wait on queue if necessary).

ACE_INLINE int ACE_RW_Process_Mutex::acquire_read (  void    )

Acquire lock ownership (wait on queue if necessary).

ACE_INLINE int ACE_RW_Process_Mutex::acquire_write (  void    )

Acquire lock ownership (wait on queue if necessary).

void ACE_RW_Process_Mutex::dump (  void    )  const

Dump the state of an object.

ACE_INLINE const ACE_File_Lock & ACE_RW_Process_Mutex::lock (  void    )  const

Return the underlying lock.

ACE_INLINE int ACE_RW_Process_Mutex::release (  void    )

Release lock and unblock a thread at head of queue.

ACE_INLINE int ACE_RW_Process_Mutex::remove (  void    )

Explicitly destroy the mutex. Note that only one thread should call this method since it doesn't protect against race conditions.

ACE_INLINE int ACE_RW_Process_Mutex::tryacquire (  void    )

Conditionally acquire lock (i.e., don't wait on queue). Returns -1 on failure. If we "failed" because someone else already had the lock, <errno> is set to <EBUSY>.

ACE_INLINE int ACE_RW_Process_Mutex::tryacquire_read (  void    )

Conditionally acquire a lock (i.e., won't block). Returns -1 on failure. If we "failed" because someone else already had the lock, <errno> is set to <EBUSY>.

ACE_INLINE int ACE_RW_Process_Mutex::tryacquire_write (  void    )

Conditionally acquire a lock (i.e., won't block). Returns -1 on failure. If we "failed" because someone else already had the lock, <errno> is set to <EBUSY>.

ACE_INLINE int ACE_RW_Process_Mutex::tryacquire_write_upgrade (  void    )

Attempt to upgrade a read lock to a write lock. Returns 0 on success, -1 on failure.

const ACE_TCHAR * ACE_RW_Process_Mutex::unique_name (  void    )  [private]

Create and return the unique name.

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Member Data Documentation

ACE_RW_Process_Mutex::ACE_ALLOC_HOOK_DECLARE

Declare the dynamic allocation hooks.

ACE_File_Lock ACE_RW_Process_Mutex::lock_ [private]

We need this to get the readers/writer semantics...

ACE_TCHAR ACE_RW_Process_Mutex::name_[ACE_UNIQUE_NAME_LEN] [private]

If the user does not provide a name we generate a unique name in this buffer.

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

• /export2/deucetmp/bala/release_try/ACE_wrappers/ace/RW_Process_Mutex.h
• /export2/deucetmp/bala/release_try/ACE_wrappers/ace/RW_Process_Mutex.cpp
• /export2/deucetmp/bala/release_try/ACE_wrappers/ace/RW_Process_Mutex.inl

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