Nested Parallel For case

Question

Hi, Could you please help in solving the parallel loop problem, which I have attached. Create a windows form application and use this form1.cs file to the project. I run this in .NET framework 4.7.2. Could some one check the case 4 and help me in solving the nested for loop with a parallel for loop. FYI: Case 2 and Case 3 works. Thanks, Boomessh V

Boomessh V · Answer

using System; using System.Collections.Generic; using System.Data; using System.Linq; using System.Threading.Tasks; using System.Windows.Forms; namespace NestedForLoop { public partial class Form1 : Form { public Form1() { InitializeComponent(); } List int > corrmask = new List int >() { 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144, 524288 }; List int > mskval = new List int >() { 1024, 1024, 1152, 1152, 1024 }; private void button1_Click( object sender, EventArgs e) { int [] arrCount = new int [25]; int [] arrCount_parallel = new int [25]; int [] arrCount_parallel_nest = new int [25]; int [] arrCount_asparallel = new int [25]; //Avoiding 2 for loops for ( int imk = 0; imk { for ( int mv = 0; mv { if ((mskval[mv] & corrmask[imk]) != 0) { arrCount[imk] = arrCount[imk] + 1; } } } List int > result = arrCount.Where(x => x != 0).ToList(); //Case 2 - WORKS //Parallel.For(0, corrmask.Count, imk => //{ // for (int mv = 0; mv // { // if ((mskval[mv] & corrmask[imk]) != 0) // { // arrCount_parallel[imk] = arrCount_parallel[imk] + 1; // } // } //}); //List result_parallel = arrCount_parallel.Where(x => x != 0).ToList(); ////Case 3 - WORKS //Parallel.For(0, corrmask.Count, imk => //{ // Parallel.For(0, mskval.Count, mv => // { // if ((mskval[mv] & corrmask[imk]) != 0) // { // arrCount_parallel_nest[imk] = arrCount_parallel_nest[imk] + 1; // } // }); //}); //List result_parallel_nest = arrCount_parallel_nest.Where(x => x != 0).ToList(); //case 4 Parallel.For(0, corrmask.Count, imk => { mskval.AsParallel().ForAll(mv => { if ((mskval[mv] & corrmask[imk]) != 0) { arrCount_asparallel[imk] = arrCount_asparallel[imk] + 1; } }); }); List int > result_asparallel = arrCount_asparallel.Where(x => x != 0).ToList(); } } } Adding the code instead of attachement...