Last change
on this file was
1646,
checked in by yushan, 6 years ago
|
branch merged with trunk @1645. arch file (ep&mpi) added for ADA
|
File size:
1.6 KB
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1 | #ifndef EP_BARRIER_HPP_INCLUDED |
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2 | #define EP_BARRIER_HPP_INCLUDED |
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3 | |
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4 | #ifdef _usingEP |
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5 | |
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6 | namespace ep_lib |
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7 | { |
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8 | |
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9 | class ep_barrier |
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10 | { |
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11 | private: |
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12 | int nbThreads; //<The number of threads for this barrier |
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13 | int currentNbThread; //<The current number of threads waiting |
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14 | bool sense; //<Direct barrier feedback protection |
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15 | omp_lock_t mutex; //<To have an atomic int |
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16 | |
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17 | ep_barrier(ep_barrier&){} |
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18 | ep_barrier& operator=(ep_barrier&){return *this;} |
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19 | |
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20 | public: |
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21 | /** Constructor with the number of threads */ |
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22 | explicit ep_barrier(const int inNbThreads) |
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23 | : nbThreads(inNbThreads), currentNbThread(0), sense(false) { |
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24 | omp_init_lock( &mutex ); |
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25 | } |
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26 | |
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27 | /** Destructor, release the omp lock */ |
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28 | ~ep_barrier(){ |
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29 | omp_destroy_lock( &mutex ); |
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30 | } |
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31 | |
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32 | /** Perform a barrier */ |
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33 | void wait(){ |
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34 | const bool mySense = sense; |
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35 | omp_set_lock( &mutex ); |
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36 | const int nbThreadsArrived = (++currentNbThread); |
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37 | omp_unset_lock( &mutex ); |
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38 | |
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39 | if(nbThreadsArrived == nbThreads) { |
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40 | currentNbThread = 0; |
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41 | sense = !sense; |
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42 | #pragma omp flush |
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43 | } |
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44 | else { |
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45 | volatile const bool* const ptSense = &sense; |
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46 | while( (*ptSense) == mySense){ |
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47 | } |
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48 | } |
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49 | } |
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50 | |
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51 | |
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52 | /** Change the number of threads */ |
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53 | void setNbThreads(const int inNbThread){ |
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54 | omp_set_lock( &mutex ); |
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55 | nbThreads = inNbThread; |
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56 | omp_unset_lock( &mutex ); |
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57 | } |
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58 | }; |
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59 | |
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60 | |
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61 | } |
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62 | #endif |
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63 | |
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64 | |
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65 | #endif // EP_BARRIER_HPP_INCLUDED |
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66 | |
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