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Diffstat (limited to 'docs/tutorials/017/Barrier_i.cpp')
-rw-r--r-- | docs/tutorials/017/Barrier_i.cpp | 160 |
1 files changed, 0 insertions, 160 deletions
diff --git a/docs/tutorials/017/Barrier_i.cpp b/docs/tutorials/017/Barrier_i.cpp deleted file mode 100644 index 0784205360a..00000000000 --- a/docs/tutorials/017/Barrier_i.cpp +++ /dev/null @@ -1,160 +0,0 @@ - -// $Id$ - -#include "Barrier_i.h" - -/* Initialize the threads_ count to zero and the barrier_ pointer to a - safe value. At the same time, we remember the thread that created - us so that we can allow it to change the thread count. -*/ -Barrier::Barrier(void) - : threads_(0) - ,barrier_(0) - ,new_barrier_(0) -{ - owner_ = ACE_OS::thr_self(); -} - -/* Ensure that barrier_ get's deleted so that we don't have a memory leak. - */ -Barrier::~Barrier(void) -{ - delete barrier_; -} - -void Barrier::owner( ACE_thread_t _owner ) -{ - owner_ = _owner; -} - -// Report on the number of threads. -u_int Barrier::threads(void) -{ - return threads_.value(); -} - -/* Allow the owning thread to (re)set the number of threads. - make_barrier() is called because it will wait() if we were already - configured. Typical usage would be for the worker threads to - wait() while the primary (eg -- owner) thread adjusts the thread - count. - - For instance: - In the worker threads: - if( myBarrier.threads() != current_thread_count ) - myBarrier.wait(); - - In the primary thread: - if( myBarrier.threads() != current_thread_count ) - myBarrier.threads( current_thread_count, 1 ); - */ -int Barrier::threads( u_int _threads, int _wait ) -{ - if( ! ACE_OS::thr_equal(ACE_OS::thr_self(), owner_) ) - { - return -1; - } - - threads_ = _threads; - - return make_barrier(_wait); -} - -/* Wait for all threads to synch if the thread count is valid. Note - that barrier_ will be 0 if the threads() mutator has not been - invoked. -*/ -int Barrier::wait(void) -{ - if( ! barrier_ ) - { - return -1; - } - - // If the threads() mutator has been used, new_barrier_ will - // point to a new ACE_Barrier instance. We'll use a - // traditional double-check here to move that new object into - // place and cleanup the old one. - if( new_barrier_ ) - { - // mutex so that only one thread can do this part. - ACE_Guard<ACE_Mutex> mutex(barrier_mutex_); - - // We only want the first thread to plug in the new barrier... - if( new_barrier_ ) - { - // out with the old and in with the new. - delete barrier_; - barrier_ = new_barrier_; - new_barrier_ = 0; - } - } - - return barrier_->wait(); -} - -/* Wait for all threads to synch. As each thread passes wait(), it - will decrement our thread counter. (That is why we had to make - threads_ an atomic op.) When the last thread decrements the - counter it will also delete the ACE_Barrier & free up a little - memory. -*/ -int Barrier::done(void) -{ - if( this->wait() == -1 ) - { - return -1; - } - - --threads_; - - if( ! threads_.value() ) - { - delete barrier_; - barrier_ = 0; - } - - return 0; -} - -/* This will build the actual barrier. I broke this code out of the - threads() mutator in case it might be useful elsewhere. - If a barrier already exists, we will wait for all threads before - creating a new one. This trait is what allows the threads mutator - to be used as shown above. - */ -int Barrier::make_barrier( int _wait ) -{ - // Ensure we have a valid thread count. - if( ! threads_.value() ) - { - return -1; - } - - // If a barrier already exists, we'll arrange for it to be - // replaced through the wait() method above. - if( barrier_ ) - { - // Create the new barrier that wait() will install for us. - ACE_NEW_RETURN(new_barrier_,ACE_Barrier(threads_.value()),-1); - - // Wait for our siblings to synch before continuing - if( _wait ) - { - barrier_->wait(); - } - } - else - { - // Create the initial barrier. - ACE_NEW_RETURN(barrier_,ACE_Barrier(threads_.value()),-1); - } - - return 0; -} - -#if defined (ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION) -template class ACE_Atomic_Op <ACE_Mutex, u_int>; -#elif defined (ACE_HAS_TEMPLATE_INSTANTIATION_PRAGMA) -#pragma instantiate ACE_Atomic_Op <ACE_Mutex, u_int> -#endif /* ACE_HAS_EXPLICIT_TEMPLATE_INSTANTIATION */ |