70 lines
2.4 KiB
C
70 lines
2.4 KiB
C
#include "sn_target.h"
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#include "StgSharpNative.h"
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#if SN_IS_OS(SN_OS_WINDOWS)
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/* Pin the calling thread to a single logical processor.
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* core_id >= 0 : bind to that logical processor (global index, across groups).
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* core_id < 0 : clear affinity constraint within the current group. */
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SN_API void SN_DECL sn_set_thread_affinity(int core_id)
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{
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if (core_id < 0) {
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/* Query which group the thread currently belongs to */
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GROUP_AFFINITY current;
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GetThreadGroupAffinity(GetCurrentThread(), ¤t);
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/* Build a full mask for that group's actual core count */
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DWORD count = GetActiveProcessorCount(current.Group);
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GROUP_AFFINITY ga;
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memset(&ga, 0, sizeof(ga));
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ga.Group = current.Group;
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ga.Mask = (count >= 64) ? ~(KAFFINITY)0 : ((KAFFINITY)1 << count) - 1;
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SetThreadGroupAffinity(GetCurrentThread(), &ga, NULL);
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return;
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}
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WORD group = (WORD)(core_id / 64);
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int index = core_id % 64;
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DWORD count = GetActiveProcessorCount(group);
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if ((DWORD)index >= count)
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return;
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GROUP_AFFINITY ga;
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memset(&ga, 0, sizeof(ga));
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ga.Group = group;
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ga.Mask = (KAFFINITY)1 << index;
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SetThreadGroupAffinity(GetCurrentThread(), &ga, NULL);
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}
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SN_API int SN_DECL sn_get_numa_overall(int *out_numa_count, int *count_of_each_numa)
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{
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ULONG highest;
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if (!GetNumaHighestNodeNumber(&highest))
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return 0;
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*out_numa_count = (int)highest + 1;
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for (UCHAR n = 0; n <= (UCHAR)highest; n++) {
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ULONGLONG mask = 0;
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GetNumaNodeProcessorMask(n, &mask);
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count_of_each_numa[n] = (int)__popcnt64(mask);
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}
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return 1;
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}
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SN_API int SN_DECL sn_get_numa_each(int numa_id, uint64_t *internal, uint32_t *global)
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{
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ULONGLONG mask = 0;
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if (!GetNumaNodeProcessorMask((UCHAR)numa_id, &mask))
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return 0;
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int intra = 0;
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while (mask) {
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uint32_t idx;
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_BitScanForward64(&idx, mask);
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int _ = (internal == NULL) ? intra : (internal[intra] = intra);
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global[intra] = (int)idx;
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intra++;
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mask &= mask - 1;
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}
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return 1;
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}
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#endif
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