//bench/incr_pxsem2.c
#include	"unpipc.h"

#define	MAXNTHREADS	100
#define	NAME	"incr_pxsem2"

int		nloop;

struct {
  sem_t	*mutex;		/*     */
  long	counter;
} shared;

void	*incr(void *);

int
main(int argc, char **argv)
{
	int		i, nthreads;
	pthread_t	tid[MAXNTHREADS];

	if (argc != 3)
		err_quit("usage: incr_pxsem2 <#loops> <#threads>");
	nloop = atoi(argv[1]);
	nthreads = min(atoi(argv[2]), MAXNTHREADS);

		/*    0 */
	sem_unlink(Px_ipc_name(NAME));		/*  - OK */
	shared.mutex = Sem_open(Px_ipc_name(NAME), O_CREAT | O_EXCL, FILE_MODE, 0);

		/*    */
	Set_concurrency(nthreads);
	for (i = 0; i < nthreads; i++) {
		Pthread_create(&tid[i], NULL, incr, NULL);
	}
		/*      */
	Start_time();
	Sem_post(shared.mutex);

		/*     */
	for (i = 0; i < nthreads; i++) {
		Pthread_join(tid[i], NULL);
	}
	printf("microseconds: %.0f usec\n", Stop_time());
	if (shared.counter != nloop * nthreads)
		printf("error: counter = %ld\n", shared.counter);
	Sem_unlink(Px_ipc_name(NAME));

	exit(0);
}
