VerySleepy Profiling c++ code -

while profiling code find going slow, have 3functions taking forever apparently, thats sleepy says.

these functions are:

zwdelayexecution    20.460813   20.460813   19.987685   19.987685 msgwaitformultipleobjects   20.460813   20.460813   19.987685   19.987685 waitforsingleobject 20.361805   20.361805   19.890967   19.890967 

can tell me these functions are? why taking long, , how fix them.

thanks

probably functions used make thread 'sleeping' in win32 api. might used thread synchronization check these thing.

they taking cpu time because designed that.

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the waitforsingleobject function can wait following objects:

• change notification
• console input
• event
• memory resource notification
• mutex
• process
• semaphore
• thread
• waitable timer

so other possible thing can used console user input waiting.

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zwdelayexecution internal function of windows. can seen used realize sleep function. here call stack sleep function can see own eyes:

0  ntdll.dll        zwdelayexecution     1  kernel32.dll     sleepex      2  kernel32.dll     sleep    

it probaly uses assembly low-level features realize can delay thread precision of 100ns.

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msgwaitformultipleobjects has similar waitforsingleobject goal.