ACE  6.0.6
Public Member Functions | Protected Attributes | Private Member Functions
ACE_Condition Class Reference

ACE_Condition variable wrapper, which allows threads to block until shared data changes state. More...

#include <Condition_T.h>

List of all members.

Public Member Functions

 ACE_Condition (MUTEX &m, int type=USYNC_THREAD, const ACE_TCHAR *name=0, void *arg=0)
 Initialize the condition variable.
 ~ACE_Condition (void)
 Implicitly destroy the condition variable.
int wait (const ACE_Time_Value *abstime)
int wait (void)
 Block on condition.
int wait (MUTEX &mutex, const ACE_Time_Value *abstime=0)
int signal (void)
 Signal one waiting thread.
int broadcast (void)
 Signal *all* waiting threads.
int remove (void)
 Explicitly destroy the condition variable.
MUTEX & mutex (void)
 Returns a reference to the underlying mutex_;.
void dump (void) const
 Dump the state of an object.

Protected Attributes

ACE_cond_t cond_
 Condition variable.
MUTEX & mutex_
 Reference to mutex lock.

Private Member Functions

void operator= (const ACE_Condition< MUTEX > &)
 ACE_Condition (const ACE_Condition< MUTEX > &)

Detailed Description

ACE_Condition variable wrapper, which allows threads to block until shared data changes state.

A condition variable enables threads to atomically block and test the condition under the protection of a mutual exclusion lock (mutex) until the condition is satisfied. That is, the mutex must have been held by the thread before calling wait or signal on the condition. If the condition is false, a thread blocks on a condition variable and atomically releases the mutex that is waiting for the condition to change. If another thread changes the condition, it may wake up waiting threads by signaling the associated condition variable. The waiting threads, upon awakening, reacquire the mutex and re-evaluate the condition. Note, you can only parameterize <ACE_Condition> with ACE_Thread_Mutex, ACE_Recursive_Thread_Mutex, or ACE_Null_Mutex.


Constructor & Destructor Documentation

ACE_Condition::ACE_Condition ( MUTEX &  m,
int  type = USYNC_THREAD,
const ACE_TCHAR name = 0,
void *  arg = 0 
)

Initialize the condition variable.

ACE_Condition::~ACE_Condition ( void  )

Implicitly destroy the condition variable.

ACE_Condition::ACE_Condition ( const ACE_Condition< MUTEX > &  ) [private]

Member Function Documentation

int ACE_Condition::broadcast ( void  )

Signal *all* waiting threads.

void ACE_Condition::dump ( void  ) const

Dump the state of an object.

Reimplemented in ACE_Thread_Condition.

MUTEX& ACE_Condition::mutex ( void  )

Returns a reference to the underlying mutex_;.

void ACE_Condition::operator= ( const ACE_Condition< MUTEX > &  ) [private]
int ACE_Condition::remove ( void  )

Explicitly destroy the condition variable.

int ACE_Condition::signal ( void  )

Signal one waiting thread.

int ACE_Condition::wait ( const ACE_Time_Value abstime)

Block on condition, or until absolute time-of-day has passed. If abstime == 0 use "blocking" <wait> semantics. Else, if abstime != 0 and the call times out before the condition is signaled wait() returns -1 and sets errno to ETIME.

int ACE_Condition::wait ( void  )

Block on condition.

int ACE_Condition::wait ( MUTEX &  mutex,
const ACE_Time_Value abstime = 0 
)

Block on condition or until absolute time-of-day has passed. If abstime == 0 use "blocking" wait() semantics on the mutex passed as a parameter (this is useful if you need to store the <Condition> in shared memory). Else, if abstime != 0 and the call times out before the condition is signaled wait() returns -1 and sets errno to ETIME.


Member Data Documentation

ACE_cond_t ACE_Condition::cond_ [protected]

Condition variable.

MUTEX& ACE_Condition::mutex_ [protected]

Reference to mutex lock.


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