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Add support to read number of online CPUs on OpenBSD

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The OpenBSD doesn't have sysctlbyname(), but sysctl() can be used to
read the number of online/available CPUs by reading following MIB(s):
[CTL_HW, HW_NCPUONLINE] with fallback to [CTL_HW, HW_NCPU].
This commit is contained in:
Ondřej Surý
2024-09-20 08:53:01 +02:00
committed by Ondřej Surý
parent 3a91c0a4e3
commit 31458d405a
1 changed files with 28 additions and 0 deletions
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28
lib/isc/os.c
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@@ -73,6 +73,29 @@ sysctlbyname_ncpus(void) {
}
#endif /* HAVE_SYSCTLBYNAME */
#if HAVE_SYS_SYSCTL_H && !defined(__linux__)
static int
sysctl_ncpus(void) {
int ncpu;
size_t len = sizeof(ncpu);
static int mib[][2] = {
#ifdef HW_NCPUONLINE
{ CTL_HW, HW_NCPUONLINE },
#endif
{ CTL_HW, HW_NCPU },
};
for (size_t i = 0; i < ARRAY_SIZE(mib); i++) {
int r = sysctl(mib[i], ARRAY_SIZE(mib[i]), &ncpu, &len, NULL,
0);
if (r != -1) {
return (ncpu);
}
}
return (-1);
}
#endif /* HAVE_SYS_SYSCTL_H */
#if defined(HAVE_SCHED_GETAFFINITY)
#include <sched.h>
@@ -131,6 +154,11 @@ ncpus_initialize(void) {
if (isc__os_ncpus <= 0) {
isc__os_ncpus = sysctlbyname_ncpus();
}
#endif
#if HAVE_SYS_SYSCTL_H && !defined(__linux__)
if (isc__os_ncpus <= 0) {
isc__os_ncpus = sysctl_ncpus();
}
#endif
if (isc__os_ncpus <= 0) {
isc__os_ncpus = sysconf_ncpus();