ACE  6.4.2
Public Member Functions | Static Public Member Functions | Public Attributes | Private Member Functions | List of all members
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...
 

Static Public Member Functions

static int unlink (const ACE_TCHAR *name)
 

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

ACE_Mutexoperator= (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
ACE_Mutex& 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.

int ACE_Mutex::unlink ( const ACE_TCHAR name)
static

If a file was created as the underlying storage for the mutex, remove it from the filesystem (for process-shared mutexes).

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.


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