matrix_serial.c

linux下多线程程序设计,包括signals,mutex,simple_once

/********************************************************
 * An example source module to accompany...
 *
 * "Using POSIX Threads: Programming with Pthreads"
 *     by Brad nichols, Dick Buttlar, Jackie Farrell
 *     O'Reilly & Associates, Inc.
 *
 ********************************************************
 * matrix_serial.c
 *
 * A simple matrix multiplication program
 * (Matrix_A  X  Matrix_B) => Matrix_C
 */

#include <stdio.h>
#define ARRAY_SIZE 10

typedef int matrix_t[ARRAY_SIZE][ARRAY_SIZE];

matrix_t MA,MB,MC;


/*
* Routine to multiply a row by a column and place element in 
* resulting matrix.
*/
void mult(int size, int row, int column, matrix_t MA, matrix_t MB, matrix_t MC)
{
	int position;
	
	MC[row][column] = 0;
	for(position = 0; position < size; position++) 
	{
		MC[row][column] = MC[row][column] + ( MA[row][position]  *  MB[position][column] ) ;
	}
}


/*
 * Main: allocates matrix, assigns values, computes the results
 */
extern int main(void)
{
	int      size, row, column;
	
	
	/* Currently size hardwired to ARRAY_SIZE size */
	size = ARRAY_SIZE;
	
	/* Fill in matrix values, currently values are hardwired */
	for (row = 0; row < size; row++) 
	{
		for (column = 0; column < size; column++) 
		{
			MA[row][column] = 1;
		}
	}
	for (row = 0; row < size; row++) 
	{
		for (column = 0; column < size; column++) 
		{
			MB[row][column] = row + column + 1;
		}
	}
	printf("MATRIX: The A array is;\n");
	for(row = 0; row < size; row ++) 
	{
		for (column = 0; column < size; column++) 
		{
			printf("%5d ",MA[row][column]);
		}
		printf("\n");
	}
	printf("MATRIX: The B array is is;\n");
	for(row = 0; row < size; row ++) 
	{
		for (column = 0; column < size; column++) 
		{
			printf("%5d ",MB[row][column]);
		}
		printf("\n");
	}
	
	
	/* Process Matrix, by row, column. */
	for(row = 0; row < size; row++) 
	{
		for (column = 0; column < size; column++) 
		{
			mult(size, row, column, MA, MB, MC);
		}
	}
	
	/* Print results */
	printf("MATRIX: The resulting matrix C is;\n");
	for(row = 0; row < size; row ++) 
	{
		for (column = 0; column < size; column++) 
		{
			printf("%5d ",MC[row][column]);
		}
		printf("\n");
	}
	return 0;
}