ACE_Mutex Class Reference

ACE_Mutex wrapper (valid in same process or across processes (depending on TYPE flag)). In general, however, we recommend using ACE_Process_Mutex or ACE_Thread_Mutex rather than ACE_Mutex. More...

#include <Mutex.h>

Public Member Functions
	ACE_Mutex (int type=USYNC_THREAD, const ACE_TCHAR *name=0, ACE_mutexattr_t *arg=0, mode_t mode=ACE_DEFAULT_FILE_PERMS)
	Initialize the mutex. More...
	~ACE_Mutex (void)
	Implicitly destroy the mutex. More...
int	remove (void)
	Explicitly destroy the mutex. More...
int	acquire (void)
	Acquire lock ownership (wait on queue if necessary). More...
int	acquire (ACE_Time_Value &tv)
int	acquire (ACE_Time_Value *tv)
int	tryacquire (void)
	Conditionally acquire lock (i.e., don't wait on queue). More...
int	release (void)
	Release lock and unblock a thread at head of queue. More...
int	acquire_read (void)
	Acquire mutex ownership. More...
int	acquire_write (void)
	Acquire mutex ownership. More...
int	tryacquire_read (void)
	Conditionally acquire mutex (i.e., won't block). More...
int	tryacquire_write (void)
	Conditionally acquire mutex (i.e., won't block). More...
int	tryacquire_write_upgrade (void)
const ACE_mutex_t &	lock (void) const
	Return the underlying mutex. More...
ACE_mutex_t &	lock (void)
void	dump (void) const
	Dump the state of an object. More...

Public Attributes
	ACE_ALLOC_HOOK_DECLARE
	Declare the dynamic allocation hooks. More...
ACE_mutex_t	lock_
	Mutex type supported by the OS. More...
bool	removed_

Private Member Functions
void	operator= (const ACE_Mutex &)
	ACE_Mutex (const ACE_Mutex &)

Detailed Description

ACE_Mutex wrapper (valid in same process or across processes (depending on TYPE flag)). In general, however, we recommend using ACE_Process_Mutex or ACE_Thread_Mutex rather than ACE_Mutex.

Constructor & Destructor Documentation

ACE_Mutex::ACE_Mutex	(	int	type = USYNC_THREAD,
		const ACE_TCHAR *	name = 0,
		ACE_mutexattr_t *	arg = 0,
		mode_t	mode = ACE_DEFAULT_FILE_PERMS
	)

Initialize the mutex.

ACE_Mutex::~ACE_Mutex

(

void

)

Implicitly destroy the mutex.

ACE_Mutex::ACE_Mutex ( const ACE_Mutex &  )

private

Member Function Documentation

int ACE_Mutex::acquire ( void  )

inline

Acquire lock ownership (wait on queue if necessary).

int ACE_Mutex::acquire ( ACE_Time_Value &  tv )

inline

Block the thread until the mutex is acquired or tv times out, in which case -1 is returned and errno == ETIME.

Note

tv is assumed to be in "absolute" rather than " relative" time. The value of tv is updated upon return to show the actual(absolute) acquisition time.

int ACE_Mutex::acquire ( ACE_Time_Value *  tv )

inline

Block the thread until the mutex is acquired or *tv times out, in which case -1 is returned and errno == ETIME. If tv == 0 then call acquire() directly. Otherwise, block the thread until the mutex is acquired or tv times out, in which case -1 is returned and errno == ETIME.

Note

*tv is assumed to be in "absolute" rather than "relative" time. The value of *tv is updated upon return to show the actual (absolute) acquisition time.

int ACE_Mutex::acquire_read ( void  )

inline

Acquire mutex ownership.

This calls acquire and is only here to make the ACE_Mutex interface consistent with the other synchronization APIs.

int ACE_Mutex::acquire_write ( void  )

inline

Acquire mutex ownership.

This calls acquire and is only here to make the ACE_Mutex interface consistent with the other synchronization APIs.

void ACE_Mutex::dump

(

void

)

const

Dump the state of an object.

const ACE_mutex_t & ACE_Mutex::lock ( void  ) const

inline

Return the underlying mutex.

ACE_mutex_t & ACE_Mutex::lock ( void  )

inline

void ACE_Mutex::operator= ( const ACE_Mutex &  )

private

int ACE_Mutex::release ( void  )

inline

Release lock and unblock a thread at head of queue.

int ACE_Mutex::remove ( void  )

inline

Explicitly destroy the mutex.

Note

Only one thread should call this method since it doesn't protect against race conditions.

int ACE_Mutex::tryacquire ( void  )

inline

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.

int ACE_Mutex::tryacquire_read ( void  )

inline

Conditionally acquire mutex (i.e., won't block).

This calls tryacquire and is only here to make the ACE_Mutex interface consistent with the other synchronization APIs.

Returns

-1 on failure. If we "failed" because someone else already had the lock, errno is set to EBUSY.

int ACE_Mutex::tryacquire_write ( void  )

inline

Conditionally acquire mutex (i.e., won't block).

This calls tryacquire and is only here to make the ACE_Mutex interface consistent with the other synchronization APIs.

Returns

-1 on failure. If we "failed" because someone else already had the lock, errno is set to EBUSY.

int ACE_Mutex::tryacquire_write_upgrade ( void  )

inline

This is only here for consistency with the other synchronization APIs and usability with Lock adapters. Assumes the caller already has acquired the mutex and returns 0 in all cases.

Member Data Documentation

ACE_Mutex::ACE_ALLOC_HOOK_DECLARE

Declare the dynamic allocation hooks.

ACE_mutex_t ACE_Mutex::lock_

Mutex type supported by the OS.

bool ACE_Mutex::removed_

Keeps track of whether remove has been called yet to avoid multiple remove calls, e.g., explicitly and implicitly in the destructor. This flag isn't protected by a lock, so make sure that you don't have multiple threads simultaneously calling remove on the same object, which is a bad idea anyway.

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

• Mutex.h
• Mutex.cpp
• Mutex.inl