simple.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.
 *
 ********************************************************
 * simple.c
 *
 * Simple serial example.  Calls three procedures.
 */

#include <stdio.h>

void do_one_thing(int *);
void do_another_thing(int *);
void do_wrap_up(int, int);

int r1 = 0, r2 = 0;

extern int	main(void)
{
	do_one_thing(&r1);
	do_another_thing(&r2);
	do_wrap_up(r1, r2);
	return 0; 
}

void do_one_thing(int *pnum_times)
{
	int i, j, x;
	
	for (i = 0;  i < 4; i++) 
	{
		printf("doing one thing\n");
		for (j = 0; j < 10000; j++) 
			x = x + i;
		(*pnum_times)++;
	}
}

void do_another_thing(int *pnum_times)
{
	int i, j, x;
	
	for (i = 0;  i < 4; i++) 
	{
		printf("doing another \n"); 
		for (j = 0; j < 10000; j++) 
			x = x + i;
		(*pnum_times)++;
	}
}

void do_wrap_up(int one_times, int another_times)
{
	int total;
	
	total = one_times + another_times;
	printf("All done, one thing %d, another %d for a total of %d\n", one_times, another_times, total);
}