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  1. #include<stdio.h>
  2. #include<stdlib.h>
  3. #include<mpi.h>
  4. #include<pthread.h>
  5. #define N 100
  6. #define T 20
  7.  
  8. int *arr1,*arr2,*arr3;
  9. void *hello(void *threadId){
  10.         long tid = (long)threadId;
  11.         long localSum = 0; 
  12.         int chunk_size = N / T;
  13.         int start = tid * chunk_size;
  14.         int end = (tid + 1) * chunk_size;
  15.  
  16.         //ensure the last thread processes the remaining elements
  17.         if(tid == T - 1){
  18.             end = N;
  19.         }
  20.         for(int i=start; i<end;i++){
  21.             arr3[i] = arr1[i] + arr2[i];
  22.         }
  23.         return NULL;
  24.  
  25.     }
  26.     int main(){
  27.         arr1 = (int *)malloc(sizeof(int) * N);
  28.         arr2 = (int *)malloc(sizeof(int) * N);
  29.         arr3 = (int *)malloc(sizeof(int) * N);
  30.         for(int i=0;i<N;i++){
  31.             arr1[i] =  i+ 1;
  32.             arr2[i] = i + 1;
  33.             arr3[i] = 0;
  34.         }  
  35.         pthread_t threads[T];
  36.         //create threads
  37.         for(long i=0;i<T;i++){
  38.             pthread_create(&threads[i],NULL,hello,(void*)i);
  39.         }
  40.         //join threads and aggregate the local sums
  41.         for(long i=0;i<T;i++){
  42.             pthread_join(threads[i],NULL);
  43.         }
  44.         for(int i=0i<N;i++){
  45.             printf("%d",arr3[i]);
  46.         }
  47.         return 0;
  48.  
  49.     }
Success #stdin #stdout #stderr 0.25s 40540KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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Error: unexpected ',' in "int *arr1,"
Execution halted
https://ideone.com/AIcFB3
language:
R (R 3.5.2)
created:
12 days ago
visibility:
public

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