How do I get my C program to sleep for 50 msec

Question

How do I get my C  program to sleep for 50 milliseconds   This might seem an easy question  but I m having a temporary brain failure moment

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Use this code  using System Threading         Thread Sleep 50

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For readability   using System Threading  Thread Sleep TimeSpan FromMilliseconds 50

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There are basically 3 choices for waiting in  almost  any programming language    Loose waiting  Executing thread blocks for given time    does not consume processing power  No processing is possible on blocked waiting thread Not so precise  Tight waiting  also called tight loop   processor is VERY busy for the entire waiting interval  in fact  it usually consumes 100  of one core s processing time  Some actions can be performed while waiting Very precise  Combination of previous 2  It usually combines processing efficiency of 1  and preciseness   ability to do something of 2       for 1  - Loose waiting in C    Thread Sleep numberOfMilliseconds     However  windows thread scheduler causes acccuracy of Sleep   to be around 15ms  so Sleep can easily wait for 20ms  even if scheduled to wait just for 1ms    for 2  - Tight waiting in C  is   Stopwatch stopwatch   Stopwatch StartNew    while  true          some other processing to do possible     if  stopwatch ElapsedMilliseconds  gt   millisecondsToWait                break            We could also use DateTime Now or other means of time measurement  but Stopwatch is much faster  and this would really become visible in tight loop    for 3  - Combination   Stopwatch stopwatch   Stopwatch StartNew    while  true          some other processing to do STILL POSSIBLE     if  stopwatch ElapsedMilliseconds  gt   millisecondsToWait                break            Thread Sleep 1     so processor can rest for a while     This code regularly blocks thread for 1ms  or slightly more  depending on OS thread scheduling   so processor is not busy for that time of blocking and code does not consume 100  of processor s power  Other processing can still be performed in-between blocking  such as  updating of UI  handling of events or doing interaction communication stuff

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Best of both worlds   using System Runtime InteropServices        DllImport  winmm dll   EntryPoint    timeBeginPeriod   SetLastError   true       private static extern uint TimeBeginPeriod uint uMilliseconds         DllImport  winmm dll   EntryPoint    timeEndPeriod   SetLastError   true       private static extern uint TimeEndPeriod uint uMilliseconds                  Extremely accurate sleep is needed here to maintain performance so system resolution time is increased             private void accurateSleep int milliseconds                  Increase timer resolution from 20 miliseconds to 1 milisecond         TimeBeginPeriod 1           Stopwatch stopwatch   new Stopwatch     Makes use of QueryPerformanceCounter WIN32 API         stopwatch Start             while  stopwatch ElapsedMilliseconds  lt  milliseconds                          So we don t burn cpu cycles             if   milliseconds - stopwatch ElapsedMilliseconds   gt  20                                Thread Sleep 5                             else                               Thread Sleep 1                                    stopwatch Stop              Set it back to normal          TimeEndPeriod 1

User · Answer

Use this code  using System Threading         Thread Sleep 50

User · Answer

Starting with  NET Framework 4 5  you can use   using System Threading Tasks   Task Delay 50  Wait         wait 50ms

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For readability   using System Threading  Thread Sleep TimeSpan FromMilliseconds 50

User · Answer

Best of both worlds   using System Runtime InteropServices        DllImport  winmm dll   EntryPoint    timeBeginPeriod   SetLastError   true       private static extern uint TimeBeginPeriod uint uMilliseconds         DllImport  winmm dll   EntryPoint    timeEndPeriod   SetLastError   true       private static extern uint TimeEndPeriod uint uMilliseconds                  Extremely accurate sleep is needed here to maintain performance so system resolution time is increased             private void accurateSleep int milliseconds                  Increase timer resolution from 20 miliseconds to 1 milisecond         TimeBeginPeriod 1           Stopwatch stopwatch   new Stopwatch     Makes use of QueryPerformanceCounter WIN32 API         stopwatch Start             while  stopwatch ElapsedMilliseconds  lt  milliseconds                          So we don t burn cpu cycles             if   milliseconds - stopwatch ElapsedMilliseconds   gt  20                                Thread Sleep 5                             else                               Thread Sleep 1                                    stopwatch Stop              Set it back to normal          TimeEndPeriod 1

User · Answer

Since now you have async await feature  the best way to sleep for 50ms is by using Task Delay   async void foo            something     await Task Delay 50       Or if you are targeting  NET 4  with Async CTP 3 for VS2010 or Microsoft Bcl Async   you must use   async void foo            something     await TaskEx Delay 50       This way you won t block UI thread

User · Answer

Thread Sleep 50     The thread will not be scheduled for execution by the operating system for the amount of time specified  This method changes the state of the thread to include WaitSleepJoin   This method does not perform standard COM and SendMessage pumping   If you need to sleep on a thread that has STAThreadAttribute  but you want to perform standard COM and SendMessage pumping  consider using one of the overloads of the Join method that specifies a timeout interval    Thread Join

User · Answer

There are basically 3 choices for waiting in  almost  any programming language    Loose waiting  Executing thread blocks for given time    does not consume processing power  No processing is possible on blocked waiting thread Not so precise  Tight waiting  also called tight loop   processor is VERY busy for the entire waiting interval  in fact  it usually consumes 100  of one core s processing time  Some actions can be performed while waiting Very precise  Combination of previous 2  It usually combines processing efficiency of 1  and preciseness   ability to do something of 2       for 1  - Loose waiting in C    Thread Sleep numberOfMilliseconds     However  windows thread scheduler causes acccuracy of Sleep   to be around 15ms  so Sleep can easily wait for 20ms  even if scheduled to wait just for 1ms    for 2  - Tight waiting in C  is   Stopwatch stopwatch   Stopwatch StartNew    while  true          some other processing to do possible     if  stopwatch ElapsedMilliseconds  gt   millisecondsToWait                break            We could also use DateTime Now or other means of time measurement  but Stopwatch is much faster  and this would really become visible in tight loop    for 3  - Combination   Stopwatch stopwatch   Stopwatch StartNew    while  true          some other processing to do STILL POSSIBLE     if  stopwatch ElapsedMilliseconds  gt   millisecondsToWait                break            Thread Sleep 1     so processor can rest for a while     This code regularly blocks thread for 1ms  or slightly more  depending on OS thread scheduling   so processor is not busy for that time of blocking and code does not consume 100  of processor s power  Other processing can still be performed in-between blocking  such as  updating of UI  handling of events or doing interaction communication stuff

User · Answer

Starting with  NET Framework 4 5  you can use   using System Threading Tasks   Task Delay 50  Wait         wait 50ms

User · Answer

Since now you have async await feature  the best way to sleep for 50ms is by using Task Delay   async void foo            something     await Task Delay 50       Or if you are targeting  NET 4  with Async CTP 3 for VS2010 or Microsoft Bcl Async   you must use   async void foo            something     await TaskEx Delay 50       This way you won t block UI thread

User · Answer

Thread Sleep 50     The thread will not be scheduled for execution by the operating system for the amount of time specified  This method changes the state of the thread to include WaitSleepJoin   This method does not perform standard COM and SendMessage pumping   If you need to sleep on a thread that has STAThreadAttribute  but you want to perform standard COM and SendMessage pumping  consider using one of the overloads of the Join method that specifies a timeout interval    Thread Join

User · Answer

Use this code  using System Threading         Thread Sleep 50

User · Answer

System Threading Thread Sleep 50     Remember though  that doing this in the main GUI thread will block your GUI from updating  it will feel  sluggish    Just remove the   to make it work for VB net as well

User · Answer

System Threading Thread Sleep 50     Remember though  that doing this in the main GUI thread will block your GUI from updating  it will feel  sluggish    Just remove the   to make it work for VB net as well

User · Answer

You can t specify an exact sleep time in Windows   You need a real-time OS for that   The best you can do is specify a minimum sleep time   Then it s up to the scheduler to wake up your thread after that   And never call  Sleep   on the GUI thread

User · Answer

You can t specify an exact sleep time in Windows   You need a real-time OS for that   The best you can do is specify a minimum sleep time   Then it s up to the scheduler to wake up your thread after that   And never call  Sleep   on the GUI thread

User · Answer

Use this code  using System Threading         Thread Sleep 50

User · Answer

System Threading Thread Sleep 50     Remember though  that doing this in the main GUI thread will block your GUI from updating  it will feel  sluggish    Just remove the   to make it work for VB net as well

User · Answer

Thread Sleep 50     The thread will not be scheduled for execution by the operating system for the amount of time specified  This method changes the state of the thread to include WaitSleepJoin   This method does not perform standard COM and SendMessage pumping   If you need to sleep on a thread that has STAThreadAttribute  but you want to perform standard COM and SendMessage pumping  consider using one of the overloads of the Join method that specifies a timeout interval    Thread Join

User · Answer

You can t specify an exact sleep time in Windows   You need a real-time OS for that   The best you can do is specify a minimum sleep time   Then it s up to the scheduler to wake up your thread after that   And never call  Sleep   on the GUI thread

User · Answer

Thread Sleep 50     The thread will not be scheduled for execution by the operating system for the amount of time specified  This method changes the state of the thread to include WaitSleepJoin   This method does not perform standard COM and SendMessage pumping   If you need to sleep on a thread that has STAThreadAttribute  but you want to perform standard COM and SendMessage pumping  consider using one of the overloads of the Join method that specifies a timeout interval    Thread Join

User · Answer

System Threading Thread Sleep 50     Remember though  that doing this in the main GUI thread will block your GUI from updating  it will feel  sluggish    Just remove the   to make it work for VB net as well

User · Answer

You can t specify an exact sleep time in Windows   You need a real-time OS for that   The best you can do is specify a minimum sleep time   Then it s up to the scheduler to wake up your thread after that   And never call  Sleep   on the GUI thread

[c#] How do I get my C# program to sleep for 50 msec?

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