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Can any body explain me what is the difference among sleep() , usleep() & [NSThread sleepForTimeInterval:] ?
What is the best condition to use these methods ?
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The difference between sleep() and usleep() is that sleep() takes a number of seconds as its parameter, whereas usleep() takes a number of microseconds - millionths of a second - as its parameter.
The function usleep() is a C API that suspends the current process for the number of microseconds passed to it. It can be used for delaying a job. DLYJOB works well if you are looking to delay a job for more than a second. If you need to delay the job for less than a second, however, you must use the usleep() API.
The sleep() function delays execution of the current script for a specified number of seconds. Note: This function throws an error if the specified number of seconds is negative.
The sleep() function in PHP is an inbuilt function which is used to delay the execution of the current script for a specified number of seconds. The sleep( ) function accepts seconds as a parameter and returns TRUE on success or FALSE on failure.
sleep(3) is a posix standard library method that attempts to suspend the calling thread for the amount of time specified in seconds. usleep(3) does the same, except it takes a time in microseconds instead. Both are actually implemented with the nanosleep(2) system call.
The last method does the same thing except that it is part of the Foundation framework rather than being a C library call. It takes an NSTimeInterval that represents the amount of time to be slept as a double indicating seconds and fractions of a second.
For all intents and purposes, they all do functionally the same thing, i.e., attempt to suspend the calling thread for some specified amount of time.
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What is the best condition to use these methods ?
Or, really, pretty much almost assuredly never ever outside of the most unique of circumstances.
What are you trying to do?
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