#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

#define NUM 100

void *countupdown( void* ptr );

long count[NUM];
int max = NUM;
long limit =1000000L;

int main(int argc, char* argv[])
{
	pthread_t thread1, thread2, thread3, thread4;
	int  iret1, iret2, iret3, iret4;
	int i, j;
	char* option;
	char* arg;

	/* 引数の処理 */
	for ( i = 1 ; i < (argc-1) ; i+=2 ) {
		option = argv[i];
		arg = argv[i+1];
		if ( strcmp(option, "-max") == 0 ) {
			max = atoi(arg);
			if ( max > NUM ) {
				fprintf(stderr, "max is too large\n");
				exit(1);
			}
		} else if ( strcmp(option, "-limit") == 0 ) {
			limit = atol(arg);
		} else {
			fprintf(stderr, "Unknown option: %s\n", option);
			exit(2);
		}
	}

	printf("max=%d\n", max);
	printf("limit=%d\n", limit);

	/* スレッドの生成 */
	iret1 = pthread_create( &thread1, NULL, countupdown, (void*) "thread1");
	iret2 = pthread_create( &thread2, NULL, countupdown, (void*) "thread2");
	iret3 = pthread_create( &thread3, NULL, countupdown, (void*) "thread3");
	iret4 = pthread_create( &thread4, NULL, countupdown, (void*) "thread4");

	/* 全てのスレッドの終了待ち */
	pthread_join(thread1, NULL);
	pthread_join(thread2, NULL); 
	pthread_join(thread3, NULL);
	pthread_join(thread4, NULL); 

	/* 結果の表示 */
	for ( j=0 ; j < max ; j++ ) {
		printf("count[%d]=%ld\n", j, count[j]);
	}

	exit(0);
}

void *countupdown( void *name )
{
	char* string = (char*)name;
	long i = 0;
	long j = 0;
	for ( i=0 ; i < limit ; i++ ){
		for ( j=0 ; j < max ; j++ ) {
			count[j] = count[j] + 2;
		}
		for ( j=0 ; j < max ; j++ ) {
			count[j] = count[j] - 2;
		}
	}
}