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(NANOSLEEP_BUG_WORKAROUND): Remove.
(xnanosleep): Remove the workaround.
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nanosleep whereby it fails without setting errno upon being resumed
after being suspended.
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(timespec_subtract): Remove.
(NANOSLEEP_BUG_WORKAROUND): New constant.
(xnanosleep): Use gethrxtime rather than gettime; this simplifies
things considerably. Use it only on GNU/Linux hosts, since the
workaround shouldn't be needed elsewhere.
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(CHAR_BIT): Remove.
(timespec_subtract, xnanosleep): Use bool for booleans.
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Work even if X-Y overflows when subtracting. Make explicit the
assumption that tv_nsec must be in range.
(clock_get_realtime): Remove. All callers changed to invoke gettime,
for simplicity.
(xnanosleep): Check for gettime failure every time.
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rather than an inferior, open-coded version that would fail on
AIX systems due to clock_gettime failing with errno == ENOSYS.
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since the code should work properly even in the default rounding mode.
(<fenv.h>): Do not include.
(#pragma STDC FENV_ACCESS ON): Remove.
(xnanosleep): Don't futz with rounding state.
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Check errno after nanosleep returns -1.
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