ACE_Thread_Mutex Class Reference

ACE_Thread_Mutex wrapper (only valid for threads in the same process). More...

#include <Thread_Mutex.h>

Public Member Functions
	ACE_Thread_Mutex (const ACE_TCHAR *name=0, ACE_mutexattr_t *attributes=0)
	Constructor. More...
	~ACE_Thread_Mutex (void)
	Implicitly destroy the mutex. More...
int	remove (void)
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)
int	release (void)
	Release lock and unblock a thread at head of queue. More...
int	acquire_read (void)
int	acquire_write (void)
int	tryacquire_read (void)
int	tryacquire_write (void)
int	tryacquire_write_upgrade (void)
const ACE_thread_mutex_t &	lock (void) const
	Return the underlying mutex. More...
ACE_thread_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...

Protected Attributes
ACE_thread_mutex_t	lock_
	Mutex type that supports single-process locking efficiently. More...
bool	removed_

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

Detailed Description

ACE_Thread_Mutex wrapper (only valid for threads in the same process).

This implementation is optimized for locking threads that are in the same process. It maps to <CRITICAL_SECTION>s on NT and <ACE_mutex_t> with <type> set to <USYNC_THREAD> on UNIX. ACE_Thread_Mutex is recursive on some platforms (like Win32). However, on most platforms (like Solaris) it is not recursive. To be totally safe and portable, developers should use ACE_Recursive_Thread_Mutex when they need a recursive mutex.

Constructor & Destructor Documentation

ACE_Thread_Mutex::ACE_Thread_Mutex	(	const ACE_TCHAR *	name = 0,
		ACE_mutexattr_t *	attributes = 0
	)

Constructor.

ACE_Thread_Mutex::~ACE_Thread_Mutex

(

void

)

Implicitly destroy the mutex.

ACE_Thread_Mutex::ACE_Thread_Mutex ( const ACE_Thread_Mutex &  )

private

Member Function Documentation

int ACE_Thread_Mutex::acquire ( void  )

inline

Acquire lock ownership (wait on queue if necessary).

int ACE_Thread_Mutex::acquire ( ACE_Time_Value &  tv )

inline

Block the thread until we acquire the mutex or until tv times out, in which case -1 is returned with errno == ETIME. Note that 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_Thread_Mutex::acquire ( ACE_Time_Value *  tv )

inline

If tv == 0 the call acquire() directly. Otherwise, Block the thread until we acquire the mutex or until tv times out, in which case -1 is returned with errno == ETIME. Note that 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_Thread_Mutex::acquire_read ( void  )

inline

Acquire mutex ownership. This calls acquire() and is only here to make the ACE_Thread_Mutex interface consistent with the other synchronization APIs.

int ACE_Thread_Mutex::acquire_write ( void  )

inline

Acquire mutex ownership. This calls acquire() and is only here to make the ACE_Thread_Mutex interface consistent with the other synchronization APIs.

void ACE_Thread_Mutex::dump

(

void

)

const

Dump the state of an object.

const ACE_thread_mutex_t & ACE_Thread_Mutex::lock ( void  ) const

inline

Return the underlying mutex.

ACE_thread_mutex_t & ACE_Thread_Mutex::lock ( void  )

inline

void ACE_Thread_Mutex::operator= ( const ACE_Thread_Mutex &  )

private

int ACE_Thread_Mutex::release ( void  )

inline

Release lock and unblock a thread at head of queue.

int ACE_Thread_Mutex::remove ( void  )

inline

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

int ACE_Thread_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_Thread_Mutex::tryacquire_read ( void  )

inline

Conditionally acquire mutex (i.e., won't block). This calls tryacquire() and is only here to make the ACE_Thread_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_Thread_Mutex::tryacquire_write ( void  )

inline

Conditionally acquire mutex (i.e., won't block). This calls tryacquire() and is only here to make the ACE_Thread_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_Thread_Mutex::tryacquire_write_upgrade ( void  )

inline

This is only here to make the ACE_Thread_Mutex interface consistent with the other synchronization APIs. Assumes the caller has already acquired the mutex using one of the above calls, and returns 0 (success) always.

Member Data Documentation

ACE_Thread_Mutex::ACE_ALLOC_HOOK_DECLARE

Declare the dynamic allocation hooks.

ACE_thread_mutex_t ACE_Thread_Mutex::lock_

protected

Mutex type that supports single-process locking efficiently.

bool ACE_Thread_Mutex::removed_

protected

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:

• Thread_Mutex.h
• Thread_Mutex.cpp
• Thread_Mutex.inl