Question

-(void)startThread {

m_bRunThread = YES;  

    if(m_bRunThread) {

        NSThread* myThread = [[NSThread alloc]initWithTarget:self selector:@selector(display) object:theConditionLock];
        [myThread start];

        /*((WaitForSingleobject(event,1500) != WAIT_OBJECT_O) || !m_bRunThread) {

        m_bRunThread = false;
        Trace(_T("Unable to start display Thread\n"));
        }*/

        }
        [self insert];
    }

    -(void)insert {

        [theConditionLock lockWhenCondition:LOCK];
        NSLog(@"I'm into insert function of thread!");
        [theConditionLock unlockWithCondition:UNLOCK];
    }

    -(void)display {

        NSLog(@"I'm into display function");

            while (YES) {
                [theConditionLock lockWhenCondition:LOCK];
                NSAutoreleasePool* pool1 = [[NSAutoreleasePool alloc]init];
                NSLog(@"Into the lock");
                [theConditionLock unlockWithCondition:UNLOCK];
                [pool1 drain];
            }
    }

在调用insert方法之前调用startThread.display调用insert和display方法。但是我希望显示等到插入完成它的执行。如果它停止了一个信号必须是发送到开始线程以显示错误消息。

怎么做。

但是在上面的代码中，首先调用display方法，然后在无限循环中继续。

Answer 1

如果你想在显示前调用insert，只需将它移到调用上方即可启动线程。

        m_bRunThread = YES;     
        [self insert];
        if(m_bRunThread)
        {
         NSThread* myThread = [[NSThread alloc]initWithTarget:self selector:@selector(display) object:theConditionLock];
         [myThread start];

        }

Answer 2

您可以在performSelector:onThread:withObject:waitUntilDone:

上尝试：self

根据我的理解，你想同步插入和显示线程，这样在insert（startThread）之后调用display，并报告回insert（startThread）（不确定我是否正确）。如果我把它弄好，那么这样的事情应该可以解决问题（没有经过测试，可能需要一些小改动）：

    [self insert];
     NSThread* myThread = [[NSThread alloc] init];
     [self performSelector:@selector(display) onThread:myThread withObject:nil waitUntilDone:YES];
    //myThread stopped, check its return status (maybe set some variables) and display error message

这将是另一种方式：

    m_bRunThread = YES;     
    [self insert];
            if(m_bRunThread)
    {
     NSThread* myThread = [[NSThread alloc]initWithTarget:self selector:@selector(display) object:theConditionLock];
     [myThread start];
    }
    while(m_bRunThread){//check if display is still running
        [NSThread sleepForTimeInterval:0.5];
    }
    //display thread stopped

目标C中的主题

2 个答案: