[896561] | 1 | /******************************************************************* |
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| 2 | * Computer Algebra System SINGULAR |
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| 3 | * |
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| 4 | * tmult.cc: p_Mult_nn with pthreads - experimental |
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| 5 | * |
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| 6 | * Version: $Id$ |
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| 7 | *******************************************************************/ |
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| 8 | #include <kernel/mod2.h> |
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| 9 | #include <kernel/structs.h> |
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| 10 | #include <kernel/numbers.h> |
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| 11 | #include <kernel/polys.h> |
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| 12 | #include <kernel/longrat.h> |
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| 13 | #ifdef SI_THREADS |
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| 14 | #include <pthread.h> |
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| 15 | #include <stdlib.h> |
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| 16 | #include <stdio.h> |
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| 17 | |
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| 18 | #define NUM_THREADS 8 |
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| 19 | #define THREAD_MIN_LENGTH 10*NUM_THREADS |
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| 20 | |
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| 21 | struct p_Mult_nn_thread_data |
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| 22 | { |
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| 23 | int thread_id; |
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| 24 | poly p; |
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| 25 | number n; |
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| 26 | ring r; |
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| 27 | }; |
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| 28 | |
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| 29 | |
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| 30 | void* p_Mult_nn_doMult(void *threadarg) |
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| 31 | { |
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| 32 | struct p_Mult_nn_thread_data *my_data; |
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| 33 | my_data = (struct p_Mult_nn_thread_data *) threadarg; |
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| 34 | //long taskid = my_data->thread_id; |
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| 35 | poly p = my_data->p; |
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| 36 | number n = my_data->n; |
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| 37 | ring r = my_data->r; |
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| 38 | while (1) |
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| 39 | { |
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| 40 | //if (p==NULL) return NULL; |
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| 41 | if (p==NULL) pthread_exit(NULL); |
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| 42 | nlInpMult(pGetCoeff(p), n,r); |
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| 43 | for (int i=0;i<NUM_THREADS;i++) |
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| 44 | { |
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| 45 | pIter(p); |
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| 46 | if (p==NULL) pthread_exit(NULL); |
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| 47 | //if (p==NULL) return NULL; |
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| 48 | } |
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| 49 | } |
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| 50 | return NULL; |
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| 51 | } |
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| 52 | |
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| 53 | static inline int pLengthOrMore(poly p, int m) |
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| 54 | { |
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| 55 | int l; |
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| 56 | for(l=0;(p!=NULL) && (l<=m); l++) pIter(p); |
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| 57 | return l; |
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| 58 | } |
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| 59 | |
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| 60 | extern "C" poly p_Mult_nn__FieldQ_LengthGeneral_OrdGeneral(poly,const number,const ring); |
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| 61 | |
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| 62 | poly p_Mult_nn_pthread(poly p, const number n, const ring r) |
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| 63 | { |
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| 64 | if (p==NULL) return NULL; |
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| 65 | poly q=p; |
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| 66 | if ((nlSize(n)>2) && (pLengthOrMore(q,THREAD_MIN_LENGTH)>=THREAD_MIN_LENGTH)) |
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| 67 | { |
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| 68 | pthread_t threads[NUM_THREADS]; |
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| 69 | struct p_Mult_nn_thread_data thread_data_array[NUM_THREADS]; |
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| 70 | pthread_attr_t attr; |
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| 71 | /* Initialize and set thread detached attribute */ |
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| 72 | pthread_attr_init(&attr); |
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| 73 | pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE); |
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| 74 | |
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| 75 | int rc; |
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| 76 | int t; |
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| 77 | for(t=0; t<NUM_THREADS; t++) |
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| 78 | { |
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| 79 | //printf("In main: creating thread %ld\n", t); |
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| 80 | thread_data_array[t].thread_id = t; |
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| 81 | thread_data_array[t].p = p; |
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| 82 | thread_data_array[t].n = n; |
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| 83 | thread_data_array[t].r = r; |
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| 84 | //p_Mult_nn_doMult(&(thread_data_array[t])); |
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| 85 | rc = pthread_create(&threads[t], &attr, p_Mult_nn_doMult, |
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| 86 | (void *) &thread_data_array[t]); |
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| 87 | if (rc) |
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| 88 | { |
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| 89 | printf("ERROR; return code from pthread_create() is %d\n", rc); |
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| 90 | exit(-1); |
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| 91 | } |
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| 92 | pIter(p); |
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| 93 | if (p==NULL) break; |
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| 94 | } |
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| 95 | /* Free attribute and wait for the other threads */ |
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| 96 | pthread_attr_destroy(&attr); |
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| 97 | for(t=NUM_THREADS-1; t>=0; t--) |
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| 98 | { |
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| 99 | void *status; |
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| 100 | |
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| 101 | rc = pthread_join(threads[t], &status); |
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| 102 | if (rc) |
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| 103 | { |
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| 104 | printf("ERROR; return code from pthread_join() is %d\n", rc); |
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| 105 | exit(-1); |
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| 106 | } |
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| 107 | } |
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| 108 | |
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| 109 | return q; |
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| 110 | } |
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| 111 | else |
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| 112 | { |
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| 113 | return p_Mult_nn__FieldQ_LengthGeneral_OrdGeneral(p,n,r); |
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| 114 | } |
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| 115 | } |
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| 116 | #endif |
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