1 /* CalculiX - A 3-dimensional finite element program */
2 /* Copyright (C) 1998-2021 Guido Dhondt */
3
4 /* This program is free software; you can redistribute it and/or */
5 /* modify it under the terms of the GNU General Public License as */
6 /* published by the Free Software Foundation(version 2); */
7 /* */
8
9 /* This program is distributed in the hope that it will be useful, */
10 /* but WITHOUT ANY WARRANTY; without even the implied warranty of */
11 /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
12 /* GNU General Public License for more details. */
13
14 /* You should have received a copy of the GNU General Public License */
15 /* along with this program; if not, write to the Free Software */
16 /* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
17
18 /* A parallel copy of arrays which depent on active element */
19
20
21 #include <unistd.h>
22 #include <stdio.h>
23 #include <math.h>
24 #include <stdlib.h>
25 #include <pthread.h>
26 #include "CalculiX.h"
27
28 static ITG *neapar=NULL,*nebpar=NULL;
29
30 static ITG *iva11=NULL,*iva21=NULL;
31
cpyparitg(ITG * iva1,ITG * iva2,ITG * isize,ITG * num_cpus)32 void cpyparitg(ITG *iva1,ITG *iva2,ITG *isize,ITG *num_cpus){
33
34
35 // static ITG i,num_cpus,nepar,idelta,isum,*ipar=NULL;
36
37 ITG i,idelta,isum;
38
39 /* variables for multithreading procedure */
40
41 ITG *ithread=NULL;
42
43 pthread_t tid[*num_cpus];
44
45 /* determining the element bounds in each thread */
46
47 NNEW(neapar,ITG,*num_cpus);
48 NNEW(nebpar,ITG,*num_cpus);
49
50 /* dividing the element number range into num_cpus equal numbers of
51 active entries. */
52
53 idelta=(ITG)floor(*isize/(double)(*num_cpus));
54 isum=0;
55 for(i=0;i<*num_cpus;i++){
56 neapar[i]=isum;
57 if(i!=*num_cpus-1){
58 isum+=idelta;
59 }else{
60 isum=*isize;
61 }
62 nebpar[i]=isum;
63 }
64
65 /* create threads and wait */
66 iva11=iva1;iva21=iva2;
67 NNEW(ithread,ITG,*num_cpus);
68
69 for(i=0; i<*num_cpus; i++) {
70 ithread[i]=i;
71 pthread_create(&tid[i], NULL, (void *)cpyparitgmt, (void *)&ithread[i]);
72 }
73 for(i=0; i<*num_cpus; i++) pthread_join(tid[i], NULL);
74
75 SFREE(ithread);SFREE(neapar);SFREE(nebpar);
76
77 }
78
79 /* subroutine for multithreading of copyarray*/
80
cpyparitgmt(ITG * i)81 void *cpyparitgmt(ITG *i){
82
83 ITG nea,neb,j;
84
85 nea=neapar[*i];
86 neb=nebpar[*i];
87
88 for(j=nea;j<neb;j++){
89 iva11[j]=iva21[j];
90 }
91
92 return NULL;
93 }
94