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BZ#13792: Move timeval_subtract example function in manual into an examples/ C source file.

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Roland McGrath 2012-03-02 15:49:03 -08:00
parent 49efa33d3d
commit 01ae168d6d
2 changed files with 8 additions and 28 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2012-03-02 Roland McGrath <roland@hack.frob.com>
[BZ #13792]
* manual/time.texi (Elapsed Time): Move timeval_subtract example
function to ...
* manual/timeval_subtract.c.texi: ... here, new file.
2012-03-02 David S. Miller <davem@davemloft.net>
* sysdeps/sparc/fpu/libm-test-ulps: Update for recently added tests.

29
manual/time.texi
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@ -139,34 +139,7 @@ this. It works even on some peculiar operating systems where the
@code{tv_sec} member has an unsigned type.
@smallexample
/* @r{Subtract the `struct timeval' values X and Y,}
@r{storing the result in RESULT.}
@r{Return 1 if the difference is negative, otherwise 0.} */
int
timeval_subtract (result, x, y)
struct timeval *result, *x, *y;
@{
/* @r{Perform the carry for the later subtraction by updating @var{y}.} */
if (x->tv_usec < y->tv_usec) @{
int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
y->tv_usec -= 1000000 * nsec;
y->tv_sec += nsec;
@}
if (x->tv_usec - y->tv_usec > 1000000) @{
int nsec = (x->tv_usec - y->tv_usec) / 1000000;
y->tv_usec += 1000000 * nsec;
y->tv_sec -= nsec;
@}
/* @r{Compute the time remaining to wait.}
@r{@code{tv_usec} is certainly positive.} */
result->tv_sec = x->tv_sec - y->tv_sec;
result->tv_usec = x->tv_usec - y->tv_usec;
/* @r{Return 1 if result is negative.} */
return x->tv_sec < y->tv_sec;
@}
@include timeval_subtract.c.texi
@end smallexample
Common functions that use @code{struct timeval} are @code{gettimeofday}