Threads implementations.

Can somebody help with this code:
Task: Square matrix clockwise rotation using 2*N Threads 1)first quater i.e N/2 (4,7)->(11,6) ..2) second quater (11,16)->(10,13),so on and so forth...
Thanks,
Mozala

Input matrix 4x4

1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16

Matrix 4x4 after rotation:

13 2 3 1
5 10 6 8
9 11 7 12
16 14 15 4

Code:

#include <pthread.h> #include <iostream> #define MAX_ROW 10 #define MAX_COL 10 using namespace std; struct matrix_index_type { int row; int col; }; struct matrix_index_type matrix_index[MAX_ROW][MAX_COL]; int aux[MAX_COL]; int matrix[MAX_ROW][MAX_COL]; /*-------------------Read Matrix------------------*/ void read_matrix(int matrix[][MAX_COL]) { int i,j; for(i = 0; i < MAX_ROW; i ++) { for(j = 0; j < MAX_COL; j ++) { cin<<matrix[i][j]; } } } /*--------------PRINT OUT MATRIX-------------------*/ output_matrix(int matrix[][MAX_COL]) { int i,j; for(i = 0; i < MAX_ROW; i ++) { for(j = 0; j < MAX_COL; j ++) { cout<<matrix[i][j]<<endl; } cout<<"\n"; } cout<<"Finished printing.."<<endl; } /*---------------------Rotate---------------------*/ void *rotate( void * index) { int i,j,x; struct matrix_index_type *pindex; pindex = (struct matrix_index_type *) index; i = pindex->row; j = pindex->col; aux[MAX_COL]=matrix[i][j]; pthread_mutex_unlock(MD[j]) aux[MAX_COL]=matrix[i][j]; pthread_mutex_unlock(MD[i]); pthread_mutex_lock(SD[j]) for (x=0;x<MAX_COL;x++) { pthread_exit(NULL); } } /*-------------------MAIN PROGRAM-----------------*/ int main() { int Imatrix[][MAX_COL]={1,2,3,4},{5,6,7,8},{9,10,11,12},{13,14,15,16}; int i, j; int index[MAX_ROW][MAX_COL]; pthread_t ptd[MAX_ROW][MAX_COL]; read_matrix(Imatrix); cout<<"Input matrix is:\n"<<endl; output_matrix(Imatrix); for(i = 0; i < MAX_ROW; i ++) { for(j = 0; j < MAX_COL; j ++) { matrix_index[i][j].row = i; matrix_index[i][j].col = j; pthread_create( &ptd[i][j],NULL,rotate, (void*) &matrix_index[i][j]); } } for(i = 0; i < MAX_ROW; i ++) { for(j = 0; j < MAX_COL; j ++) { pthread_join( ptd[i][j], NULL); } } cout<<"Rotated matrix is:\n"; output_matrix(Imatrix); } pthread_mutex_destroy(&mutex); pthread_exit(NULL); return 0; }