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Full Discussion: Unix-based operating systems
Operating Systems Linux Fedora Unix-based operating systems Post 302363474 by pludi on Tuesday 20th of October 2009 11:16:19 AM
Old 10-20-2009
Let's see if I can help you a bit:
  1. There was, a long time ago, the one original AT&T UNIX. However, it's long been discontinued, with rights going through various hands (see the current Novell vs. SCO squabble). Sometime around the late 1970s, two different systems started to emerge: System V, and the Berkley Standard Distribution. Current Unices are based on those two. For a complete overview, Wikipedia has a pretty good article.
  2. If by "high-end" you mean "expensive closed-source company produced", you won't be able to buy these alone. Those usually come bundled with hardware, and aren't available without it (AIX, HP-UX, and MacOS X are examples of that).
    Deciding on what UNIX to use depends on what you want to do. If you want to develop in a wide range of languages, or using the most current hardware, I'd suggest Linux. If you want a stable system (both in terms of run-time and system behaviour), I'd suggest *BSD or OpenSolaris
  3. The hardware modern Intel-based Macs use is pretty much completely PC hardware, so it won't make any difference on stability. But I suggest setting up the new system on different hardware, since it won't be as much trouble should you need to re-install.
 

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gethrtime(3C)						   Standard C Library Functions 					     gethrtime(3C)

NAME
gethrtime, gethrvtime - get high resolution time SYNOPSIS
#include <sys/time.h> hrtime_t gethrtime(void); hrtime_t gethrvtime(void); DESCRIPTION
The gethrtime() function returns the current high-resolution real time. Time is expressed as nanoseconds since some arbitrary time in the past; it is not correlated in any way to the time of day, and thus is not subject to resetting or drifting by way of adjtime(2) or settime- ofday(3C). The hi-res timer is ideally suited to performance measurement tasks, where cheap, accurate interval timing is required. The gethrvtime() function returns the current high-resolution LWP virtual time, expressed as total nanoseconds of execution time. The gethrtime() and gethrvtime() functions both return an hrtime_t, which is a 64-bit (long long) signed integer. EXAMPLES
The following code fragment measures the average cost of getpid(2): hrtime_t start, end; int i, iters = 100; start = gethrtime(); for (i = 0; i < iters; i++) getpid(); end = gethrtime(); printf("Avg getpid() time = %lld nsec ", (end - start) / iters); ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
proc(1), adjtime(2), gettimeofday(3C), settimeofday(3C), attributes(5) NOTES
Although the units of hi-res time are always the same (nanoseconds), the actual resolution is hardware dependent. Hi-res time is guaran- teed to be monotonic (it won't go backward, it won't periodically wrap) and linear (it won't occasionally speed up or slow down for adjust- ment, like the time of day can), but not necessarily unique: two sufficiently proximate calls may return the same value. SunOS 5.10 7 Sep 2004 gethrtime(3C)
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