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--- groups/bsl/bslmt/bslmt_threadutilimpl_pthread.cpp.orig 2023-08-03 19:22:19 UTC
+++ groups/bsl/bslmt/bslmt_threadutilimpl_pthread.cpp
@@ -41,6 +41,8 @@ BSLS_IDENT_RCSID(bslmt_threadutilimpl_pthread_cpp,"$Id
# include <mach/mach.h> // clock_sleep
# include <mach/clock.h> // clock_sleep
# include <sys/sysctl.h> // sysctl
+#elif defined(BSLS_PLATFORM_OS_FREEBSD)
+#include <sys/sysctl.h>
#elif defined(BSLS_PLATFORM_OS_SOLARIS)
# include <sys/utsname.h>
#elif defined(BSLS_PLATFORM_OS_LINUX)
@@ -557,7 +559,11 @@ bslmt::ThreadUtilImpl<bslmt::Platform::PosixThreads>::
// set the mib for hw.ncpu.
mib[0] = CTL_HW;
+#if defined(HW_AVAILCPU)
mib[1] = HW_AVAILCPU; // alternatively, try HW_NCPU
+#else
+ mib[1] = HW_NCPU;
+#endif
// Get the number of CPUs from the system.
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