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Use sysctl kern.sched.cpusetsize to retrieve size of kernel cpuset.

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This commit is contained in:
David Xu 2010-11-02 02:13:13 +00:00
parent ea84fab2ce
commit 1d1486408b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=214653
1 changed files with 4 additions and 7 deletions
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11
lib/libthr/thread/thr_attr.c
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@ -569,14 +569,11 @@ _get_kern_cpuset_size(void)
if (kern_cpuset_size == 0) {
size_t len;
int maxcpus;
len = sizeof(maxcpus);
if (sysctlbyname("kern.smp.maxcpus", &maxcpus, &len, NULL, 0))
PANIC("failed to get sysctl kern.smp.maxcpus");
int nbits_long = sizeof(long) * NBBY;
int num_long = (maxcpus + nbits_long - 1) / nbits_long;
kern_cpuset_size = num_long * sizeof(long);
len = sizeof(kern_cpuset_size);
if (sysctlbyname("kern.sched.cpusetsize", &kern_cpuset_size,
&len, NULL, 0))
PANIC("failed to get sysctl kern.sched.cpusetsize");
}
return (kern_cpuset_size);