Rev | Line | |
---|
[1604] | 1 | #ifndef EP_BARRIER_HPP_INCLUDED |
---|
| 2 | #define EP_BARRIER_HPP_INCLUDED |
---|
| 3 | |
---|
| 4 | |
---|
| 5 | namespace ep_lib |
---|
| 6 | { |
---|
| 7 | |
---|
| 8 | class ep_barrier |
---|
| 9 | { |
---|
| 10 | private: |
---|
| 11 | int nbThreads; //<The number of threads for this barrier |
---|
| 12 | int currentNbThread; //<The current number of threads waiting |
---|
| 13 | bool sense; //<Direct barrier feedback protection |
---|
| 14 | omp_lock_t mutex; //<To have an atomic int |
---|
| 15 | |
---|
| 16 | ep_barrier(ep_barrier&){} |
---|
| 17 | ep_barrier& operator=(ep_barrier&){return *this;} |
---|
| 18 | |
---|
| 19 | public: |
---|
| 20 | /** Constructor with the number of threads */ |
---|
| 21 | explicit ep_barrier(const int inNbThreads) |
---|
| 22 | : nbThreads(inNbThreads), currentNbThread(0), sense(false) { |
---|
| 23 | omp_init_lock( &mutex ); |
---|
| 24 | } |
---|
| 25 | |
---|
| 26 | /** Destructor, release the omp lock */ |
---|
| 27 | ~ep_barrier(){ |
---|
| 28 | omp_destroy_lock( &mutex ); |
---|
| 29 | } |
---|
| 30 | |
---|
| 31 | /** Perform a barrier */ |
---|
| 32 | void wait(){ |
---|
| 33 | const bool mySense = sense; |
---|
| 34 | omp_set_lock( &mutex ); |
---|
| 35 | const int nbThreadsArrived = (++currentNbThread); |
---|
| 36 | omp_unset_lock( &mutex ); |
---|
| 37 | |
---|
| 38 | if(nbThreadsArrived == nbThreads) { |
---|
| 39 | currentNbThread = 0; |
---|
| 40 | sense = !sense; |
---|
| 41 | #pragma omp flush |
---|
| 42 | } |
---|
| 43 | else { |
---|
| 44 | volatile const bool* const ptSense = &sense; |
---|
| 45 | while( (*ptSense) == mySense){ |
---|
| 46 | } |
---|
| 47 | } |
---|
| 48 | } |
---|
| 49 | |
---|
| 50 | |
---|
| 51 | /** Change the number of threads */ |
---|
| 52 | void setNbThreads(const int inNbThread){ |
---|
| 53 | omp_set_lock( &mutex ); |
---|
| 54 | nbThreads = inNbThread; |
---|
| 55 | omp_unset_lock( &mutex ); |
---|
| 56 | } |
---|
| 57 | }; |
---|
| 58 | |
---|
| 59 | |
---|
| 60 | } |
---|
| 61 | |
---|
| 62 | |
---|
| 63 | |
---|
| 64 | #endif // EP_BARRIER_HPP_INCLUDED |
---|
| 65 | |
---|
Note: See
TracBrowser
for help on using the repository browser.