iOS线程关键资源加锁

新建一个view-based application,

viewcontroller.h的代码如下：

#import <UIKit/UIKit.h>

@interface tConditionViewController : UIViewController {
int tickets;
NSThread *t1;
NSThread *t2;
NSCondition *tc;
}
-(void)doSomething:(id)tname;
@end

viewcontroller.m的代码如下：

#import "tConditionViewController.h"

@implementation tConditionViewController
-(void)doSomething:(id)tname
{
NSString *name = (NSString *)tname;
while (TRUE) {
NSLog(@"in thread %@", name);
[NSThread sleepForTimeInterval:1];
[tc lock];
NSLog(@"kkkk");
[tc unlock];
}
}
- (void)dealloc
{
[super dealloc];
}

- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];

// Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
tc = [[NSCondition alloc] init];
t1 = [[NSThread alloc] initWithTarget:self selector:@selector(doSomething:) object:@"1"];
[t1 start];
t2 = [[NSThread alloc] initWithTarget:self selector:@selector(doSomething:) object:@"2"];
[t2 start];
[super viewDidLoad];
}

- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

@end