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Diffstat (limited to 'docs/tutorials/017/Barrier_i.cpp')
-rw-r--r-- | docs/tutorials/017/Barrier_i.cpp | 125 |
1 files changed, 0 insertions, 125 deletions
diff --git a/docs/tutorials/017/Barrier_i.cpp b/docs/tutorials/017/Barrier_i.cpp deleted file mode 100644 index a763c1d8273..00000000000 --- a/docs/tutorials/017/Barrier_i.cpp +++ /dev/null @@ -1,125 +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) -{ - 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_; -} - -// 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_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; - } - - 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 ) -{ - // Wait for and delete any existing barrier. - if( barrier_ ) - { - if( _wait ) - { - barrier_->wait(); - } - delete barrier_; - } - - // Ensure we have a valid thread count. - if( ! threads_.value() ) - { - return -1; - } - - // Create the actual barrier. Note that we initialize it with - // threads_.value() to set its internal thread count. If the - // 'new' fails we will return -1 to the caller. - ACE_NEW_RETURN(barrier_,ACE_Barrier(threads_.value()),-1); - - return 0; -} |