HI
I am working on Engineering application where we need thread.sleep() function many times. But since sleep interval is not accurate we need an alternative which can mimick functionality of thread.sleep() .
we have multimedia timer in our code so Please lemme know if I can use that in someway for this purpose.
Any Help would be greatly appreciated.
12  32255  Plater 7,872
Recognized Expert Expert
What do mean by Thread.Sleep() interval is not accurate?
It meaures it's time in miliseconds, which is as accurate as a windows-based PC can get. (There ways to try and do smaller timer intervals, but the resolutions of system clocks on windows PCs is generally only a milisecond...ac cording to msdn)
hi
what I mean to say is that thread.sleep(10 ) can pause current thread for more than 10 milliseconds whereas I want it to to pause thread for exactly for 10 milliseconds.si nce my application is very much time critical.
Hi,
i see what you mean.
i made a console app to test it - class Program
-
{
-
static void Main(string[] args)
-
{
-
for (int i = 0; i < 100; i++)
-
{
-
DateTime st1 = DateTime.Now;
-
Thread.Sleep(10);
-
DateTime st2 = DateTime.Now;
-
TimeSpan ts = st2.Subtract(st1);
-
Console.Write(ts.Milliseconds.ToString() + ".");
-
}
-
}
-
}
the first time the loop executes the timespan is actually 12ms. and there on always 10ms
what i then did was - class Program
-
{
-
static void Main(string[] args)
-
{
-
DateTime st1 = DateTime.Now, st2 = DateTime.Now;
-
TimeSpan ts;
-
for (int i = 0; i < 100; i++)
-
{
-
st1 = DateTime.Now;
-
Thread.Sleep(10);
-
st2 = DateTime.Now;
-
ts = st2.Subtract(st1);
-
Console.Write(ts.Milliseconds.ToString() + ".");
-
}
-
}
-
}
The output for this was 10 always.
Lesson: initialise all values after thread.sleep or else it will eat time.
does this help you anyhow?
cheers
hi Sri
Much Thanks for your time and effort but normally this will be true when you are working in small applications but in my case there are no of forms having timers and different threads running concurrently.so in these cases this doesn't work properly.
Anyways I will look into my code for your suggestion But it will be nice if I can have some stuff which always give me correct result.
Thanks again
Plater 7,872
Recognized Expert Expert
You are not going to find anything more accurate then Thread.Sleep()
Motoma 3,237
Recognized Expert Specialist
It is not that the Thread.Sleep() function is inaccurate; it is designed to pause a thread for at least the number of milliseconds you specify. You cannot be sure that the underlying OS's scheduler will allow the thread to resume immediately: if you put the system under significant load, or a large number of threads, it is quite likely you will see Threads sleeping a lot longer than you expect. It is not that the thread is actually sleeping longer than you specified, it is that has not received its next time slice of execution.
If your "engineerin g" application is to wait for a certain time....is it that you are to send the next set of commands after the specified interval, to an external piece of hardware?
If so, then send the instruction to that hardware to wait for that period of time. Nothing can get more accurate tha that then.
If it is only an internal process, then there should be a different way than making your application sleep off for a while
cheers
hi
can u please lemme know if I can approach in some otherway to achieve same result.(ex using accurate timers with events etc) from my code.again I m facing timing related issue.
code is like this.(in c#)
statementA
//here I need delay of 10 msec exact (this delay interval is also
//varying throughout code
statementB
I want statement B to be called exactly 10 msec after statement A is executed.
if some c++ code can be used in unsafe context then that would also solve my purpose.
One possible solution would be to never leave the thread, which might be okey if you just need a short sleep. Just setup a while loop and check if wanted time has passed etc.
But this requires some way to make a section atomic. Does anyone know any way to do this in .NET?
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