Use getsystemcfg to get SMT threads

src/lib.rs

@@ -342,57 +342,13 @@ fn get_num_physical_cpus() -> usize {
 
 #[cfg(target_os = "aix")]
 fn get_smt_threads_aix() -> Option<usize> {
-    use std::mem;
-
-    const LPAR_INFO_FORMAT1: i32 = 1;
-
-    #[repr(C)]
-    struct lpar_info_format1 {
-        version: i32,
-        pad0: i32,
-        max_memory: u64,
-        min_memory: u64,
-        memory_region: u64,
-        dispatch_wheel_time: u64,
-        lpar_number: u32,
-        lpar_flags: u32,
-        max_pcpus_in_sys: u32,
-        min_vcpus: u32,
-        max_vcpus: u32,
-        min_lcpus: u32,
-        max_lcpus: u32,
-        minimum_capacity: u32,
-        maximum_capacity: u32,
-        capacity_increment: u32,
-        smt_threads: u16,
-        pad1: [u8; 2],
-        num_lpars: u32,
-        lpar_name: [u8; 256],
-        desired_capacity: u32,
-        desired_vcpus: u32,
-        desired_memory: u64,
-        servpar_id: u32,
-        true_max_memory: u64,
-        true_min_memory: u64,
-        ame_max_memory: u64,
-        ame_min_memory: u64,
-        spcm_status: u32,
-        spcm_max: u32,
-    }
-
-    extern "C" {
-        fn lpar_get_info(command: i32, buffer: *mut libc::c_void, size: usize) -> i32;
-    }
-
-    let mut lpar_info: lpar_info_format1 = unsafe { mem::zeroed() };
-    let info_size = mem::size_of::<lpar_info_format1>() as usize;
-    let ret = unsafe {
-        lpar_get_info(LPAR_INFO_FORMAT1, mem::transmute(&mut lpar_info), info_size)
+    let smt = unsafe {
+        libc::getsystemcfg(libc::SC_SMT_TC)
     };
-    if ret != 0 {
+    if smt == u64::MAX {
         return None;
     }
-    Some(lpar_info.smt_threads as usize)
+    Some(smt as usize)
 }
 
 #[cfg(any(