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Function "cyg_timespec_to_ticks()" belongs to "time.cxx", part of POSIX compatibility package. This function converts a "timespec" struct to a number of ticks. The "timespec" struct is used to express a duration or a delay in nanoseconds. When testing POSIX compatibility package, the following behavior can be observed : 15.000.001 nanosecondes are converted to 3 system ticks (the system tick is set to 10 ms). The result should be 2 ticks (20 ms), We want to achieve better accuracy of this function. As it is called by "nanosleep()", the accuracy of our delays relies on "cyg_timespec_to_ticks()". The behavior we expect from "cyg_timespec_to_ticks()" is described by the table below : nanoseconds ticks 19.999.999 2 20.000.000 2 20.000.001 3 29.999.999 3 30.000.000 3 The roundup is always made to the next integer value. When the number of nanoseconds is an exact number of ticks, no roundup is necessary. Up to now, "cyg_timespec_to_ticks()" calls the "convert()" function (file "clock.inl", "kernel" package). Now, this (complicated) function is no more used at all. (See attached file: diff.txt)
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diff.txt
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InterScan_Disclaimer.txt
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