non-blocking

io_ascii.c
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			#include "io_ascii.h"
			#include <stdio.h>
			#include <stdlib.h>
			#include <string.h>
			#include <math.h>

			/* -------------------------------------------------------------------------- */
			int write_to_file(int n, float ** x, unsigned int iter, float minval,
			float maxval) {
			FILE * fp;
			char filename[256];
			char prefix[] = "out_";
			char suffix[] = ".pgm";
			char number[5];

			int i, j, lines;
			int v;

			strcpy(filename, prefix);
			sprintf(number, "%u", iter);
			while (iter < 1000) {
			strcat(filename, "0");
			if (iter == 0)
			iter = 1;
			iter *= 10;
			}
			strcat(filename, number);
			strcat(filename, suffix);
			fp = fopen(filename, "w");
			if (fp == NULL) {
			fprintf(stderr, "Can't open output file %s!\n", filename);
			exit(1);
			}

			fprintf(fp, "%s\n%s\n", "P2", "# CREATOR: poisson program");
			fprintf(fp, "%d %d\n", n, n);
			fprintf(fp, "%d\n", 255);

			lines = 4;

			for (i = 0; i < n; i++) {
			for (j = 0; j < n; j++) {
			v = (int)roundf(255 * (x[i][j] - minval) / (maxval - minval));
			v = v <= 255 ? v : 255;
			fprintf(fp, "%d \n", (int)(v));
			lines++;
			}
			}

			fclose(fp);
			printf("%d lines written to file %s\n", lines, filename);
			return 0;
			}

			/* -------------------------------------------------------------------------- */
			int colormap(int n) {
			FILE * fp;
			int i, j;
			double v;
			fp = fopen("colormap.pgm", "w");

			fprintf(fp, "%s\n%s\n", "P2", "# CREATOR: poisson program");
			fprintf(fp, "%d %d\n", 20, n);
			fprintf(fp, "%d\n", 255);

			for (j = 0; j < n; j++) {
			v = (int)roundf(255.0 * j / (n - 1));
			for (i = 0; i < 20; i++) {
			fprintf(fp, "%d \n", (int)(v));
			}
			}

			fclose(fp);
			return 0;
			}