Tokyo July, 2005 Introduction to ACE Bogdan Jeram ([email protected]) European Southern Observatory.

Tokyo July, 2005

IntroductionIntroductiontoto

ACEACE

Bogdan Jeram([email protected])

European Southern Observatory

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ALMA Project

Tokyo, July 2005 ALMA Common Software course

ACE Hardware

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What is ACE

• Adaptive Communication Environment• freely available, open-source object-oriented (OO)

framework that implements many core patterns for concurrent communication software

• OS independent interface to OS services• Portable code• very lot of very useful functionality• TAO CORBA implementation based on ACE

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ALMA Project


ACS threads

• based on ACE threads

• integrated in ACS

• thread Manager

• See specific presentation and documentation

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Protection/Locks Primitives

• ACE_Mutex– acquire()– release()– try_acquire()

• Several types of mutex:– ACE_Thread_Mutex– ACE_Recursive_Thread_Mutex– ACE_RW_Mutex (acquire_read, release_read)

– ACE_RW_Thread_Mutex

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Synchronization

• implementation of Dijekstra’s “counting semaphores”

• ACE_Semaphores:– acquire()– release()– try_acquire()

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ACE guard class

• improve application robustness

• constructor -> mutex acquired

• destructor -> mutex released

• ACE_Guard:– acquire()– release()– try_acquire()

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ALMA Project


ACE_Guard example

ACE_Recursive_Thread_Mutex m;

void write()

{ACE_Guard<ACE_Recursive_Thread_Mutex> guard(m);

// critical section

// explicitly: guard.release();

}

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ALMA Project


ACE strings

• ACE_CString:– Memory managment– Concatenation (using +)– Convention to C style string– …

• http://www.dre.vanderbilt.edu/Doxygen/Current/html/ace/classACE__String__Base.html

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ALMA Project


References

• ACE home page: http://www.cs.wustl.edu/~schmidt/ACE.html

• Several books

Tokyo July, 2005 Introduction to ACE Bogdan Jeram ([email protected]) European Southern Observatory.

Documents

Transcript of Tokyo July, 2005 Introduction to ACE Bogdan Jeram ([email protected]) European Southern Observatory.