docs/cpu-load: format the example code.
format the example code. Signed-off-by: Hui Su <sh_def@163.com> Link: https://lore.kernel.org/r/20201018170557.GA7670@rlk Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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@ -61,43 +61,46 @@ will lead to quite erratic information inside ``/proc/stat``::
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static volatile sig_atomic_t stop;
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static void sighandler (int signr)
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static void sighandler(int signr)
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{
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(void) signr;
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stop = 1;
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(void) signr;
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stop = 1;
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}
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static unsigned long hog (unsigned long niters)
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{
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stop = 0;
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while (!stop && --niters);
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return niters;
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stop = 0;
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while (!stop && --niters);
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return niters;
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}
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int main (void)
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{
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int i;
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struct itimerval it = { .it_interval = { .tv_sec = 0, .tv_usec = 1 },
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.it_value = { .tv_sec = 0, .tv_usec = 1 } };
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sigset_t set;
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unsigned long v[HIST];
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double tmp = 0.0;
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unsigned long n;
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signal (SIGALRM, &sighandler);
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setitimer (ITIMER_REAL, &it, NULL);
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int i;
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struct itimerval it = {
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.it_interval = { .tv_sec = 0, .tv_usec = 1 },
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.it_value = { .tv_sec = 0, .tv_usec = 1 } };
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sigset_t set;
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unsigned long v[HIST];
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double tmp = 0.0;
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unsigned long n;
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signal(SIGALRM, &sighandler);
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setitimer(ITIMER_REAL, &it, NULL);
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hog (ULONG_MAX);
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for (i = 0; i < HIST; ++i) v[i] = ULONG_MAX - hog (ULONG_MAX);
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for (i = 0; i < HIST; ++i) tmp += v[i];
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tmp /= HIST;
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n = tmp - (tmp / 3.0);
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hog (ULONG_MAX);
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for (i = 0; i < HIST; ++i) v[i] = ULONG_MAX - hog(ULONG_MAX);
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for (i = 0; i < HIST; ++i) tmp += v[i];
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tmp /= HIST;
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n = tmp - (tmp / 3.0);
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sigemptyset (&set);
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sigaddset (&set, SIGALRM);
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sigemptyset(&set);
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sigaddset(&set, SIGALRM);
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for (;;) {
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hog (n);
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sigwait (&set, &i);
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}
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return 0;
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for (;;) {
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hog(n);
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sigwait(&set, &i);
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}
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return 0;
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}
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