pthread

#import "ViewController.h"
#import 

@interface ViewController ()

@end

@implementation ViewController

void * run(void *param)
{
    for (NSInteger i = 0; i<50000; i++) {
        NSLog(@"------buttonClick---%zd--%@", i, [NSThread currentThread]);
    }
    return NULL;
}

- (IBAction)buttonClick:(id)sender {
    pthread_t thread;
    pthread_create(&thread, NULL, run, NULL);
    
    pthread_t thread2;
    pthread_create(&thread2, NULL, run, NULL);
}

@end