Last change
on this file since 1701 was
1651,
checked in by yushan, 5 years ago
|
dev on EP for tracing with itac. Tested on ADA with test_omp
|
File size:
1.6 KB
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Rev | Line | |
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[1651] | 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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