1 | #ifndef __TOKEN_MANAGER_HPP__ |
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2 | #define __TOKEN_MANAGER_HPP__ |
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3 | |
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4 | #include "xios_spl.hpp" |
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5 | #include "exception.hpp" |
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6 | #include "mpi.hpp" |
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7 | |
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8 | namespace xios |
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9 | { |
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10 | |
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11 | class CTokenManager |
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12 | { |
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13 | |
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14 | public: |
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15 | CTokenManager(MPI_Comm& comm, int leader) : leader_(leader) |
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16 | { |
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17 | int commRank ; |
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18 | MPI_Comm_rank(comm, &commRank) ; |
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19 | MPI_Aint size = 0 ; |
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20 | if (leader_== commRank) size = sizeof(size_t) ; |
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21 | MPI_Win_create(¤tToken_, size, sizeof(size_t), MPI_INFO_NULL, comm, &winCurrentToken_) ; |
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22 | MPI_Win_create(&retrievedToken_, size, sizeof(size_t), MPI_INFO_NULL, comm, &winRetrievedToken_) ; |
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23 | } |
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24 | |
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25 | size_t getToken(void) |
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26 | { |
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27 | size_t inc=1 ; |
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28 | size_t token ; |
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29 | MPI_Win_lock(MPI_LOCK_EXCLUSIVE, leader_, 0, winCurrentToken_) ; |
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30 | MPI_Fetch_and_op(&inc, &token, MPI_SIZE_T, leader_, 0, MPI_SUM, winCurrentToken_) ; |
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31 | MPI_Win_unlock(leader_, winCurrentToken_) ; |
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32 | return token ; |
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33 | } |
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34 | |
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35 | bool lockToken(size_t token) |
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36 | { |
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37 | size_t tokenRead ; |
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38 | MPI_Win_lock(MPI_LOCK_SHARED, leader_, 0, winRetrievedToken_) ; |
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39 | MPI_Get(&tokenRead, 1, MPI_SIZE_T, leader_, 0, 1, MPI_SIZE_T, winRetrievedToken_ ) ; |
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40 | MPI_Win_unlock(leader_, winRetrievedToken_) ; |
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41 | if (token==tokenRead) return true ; |
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42 | else return false ; |
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43 | } |
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44 | |
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45 | void unlockToken(size_t token) |
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46 | { |
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47 | size_t inc=1 ; |
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48 | size_t tokenRead ; |
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49 | MPI_Win_lock(MPI_LOCK_EXCLUSIVE, leader_, 0, winRetrievedToken_) ; |
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50 | MPI_Fetch_and_op(&inc, &tokenRead, MPI_SIZE_T, leader_, 0, MPI_SUM, winRetrievedToken_) ; |
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51 | MPI_Win_unlock(leader_, winRetrievedToken_) ; |
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52 | |
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53 | if (token!=tokenRead) ERROR("void CTokenManager::unlockToken(size_t token)",<<"Cannot release token="<<token<< |
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54 | " that is not corresponding to the locked token="<<tokenRead) ; |
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55 | } |
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56 | |
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57 | private: |
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58 | |
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59 | MPI_Win winCurrentToken_ ; |
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60 | MPI_Win winRetrievedToken_ ; |
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61 | |
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62 | int leader_ ; |
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63 | |
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64 | size_t currentToken_=0 ; |
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65 | size_t retrievedToken_=0 ; |
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66 | |
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67 | |
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68 | } ; |
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69 | |
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70 | |
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71 | } |
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72 | |
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73 | #endif |
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