Sleep() syntax

Question

Does anyone know what is the meaning of (Sleep(300), true) ??

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ajaind

Answer 1

Hi,

Do you mean Thread.Sleep?

Suspends the executing thread for 300 milliseconds.

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Answer 2

Sleep function suspends the current thread for 300 ms. the  ", true" part is some other code that isn't directly related to this function. Can you provide the full code line?

Answer 3

it's part of the while construct in a do while loop.

do
{
...
}
while (condition1 && condition2 && (Sleep(300), true))

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ajaind

Answer 4

Hi, 

First thing syntactically its not correct (compile error)

do
{
...
}
while (condition1 && condition2 && (Sleep(300, true))

This seems Sleep is custom function, could be Sleep with time and bool value.  If you provide what its been doing in Sleep function will be helpful.

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Answer 5

Hi,

Rather than asking in a forum click on Sleep and use go to definition to see what is is really is (it will go either to its code or will show this is a .NET Framework function). When you end up with a .NET framework function you should then check the documentation at http://msdn.microsoft.com/en-us/library/gg145045 (.NET Framework Class Library). Once familiar with this process you shouldn't any more have to post to find what a function is...

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Answer 6

For “while (condition1 && condition2 && (Sleep(300), true))”  I suggest the next equivalent:

while( condition1 &&

            condition2 &&

            ( new Func< bool >( () =>

                 {

                       Thread.Sleep( 300 );

                       return true;

                 } )() ) );

Or create a new 'MySleep' function that sleeps and then always returns true:

while( condition1 && condition2 && MySleep( 300 ) );

Answer 7

Sleep looks like a custom method, not really anything to do with Thread.Sleep unless it's been turned into it's own method which seems a bit extended to me.

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Answer 8

I just realized this thread is in the wrong section. It should have been in the VC++ section.

The Sleep() method used is the one available in Windows API. It's not a custom method

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ajaind

Answer 9

I just realized this thread is in the wrong section. It should have been in the VC++ section.

The Sleep() method used is the one available in Windows API. It's not a custom method

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ajaind

Then see the meaning of Comma operator: http://msdn.microsoft.com/en-us/library/zs06xbxh(v=vs.100).aspx.

Answer 10

The return type of method 'Sleep' is 'void'. A 'while' construct expects a boolean expression to evaluate whether the loop should continue or not. Since the return type of Sleep is void, it does not satisfy the 'boolean expression' condition, and so cannot be used directly in the while loop as a condition. However, combining Sleep with a 'true' in a compound expression satisfies the condition, becasue the compound expression evaluates to 'true' after sleeping for a certain time.

Hope this answers the question.