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Preserve Windows XP compatibility in core detection

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This commit is contained in:
owen
2026-07-20 19:11:45 -05:00
parent 36aad77a87
commit 7e5cbcde9c
1 changed files with 15 additions and 2 deletions
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src/app/hw_detect.c
+15 -2
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@@ -294,18 +294,31 @@ static int read_first_property(const char *path, char *dst, size_t cap)
* by GetLogicalProcessorInformationEx describes exactly one physical core. */
static long win_physical_cores(void)
{
typedef BOOL (WINAPI *get_logical_processor_information_ex_fn)(
LOGICAL_PROCESSOR_RELATIONSHIP,
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX, PDWORD);
get_logical_processor_information_ex_fn get_topology;
HMODULE kernel32;
DWORD length = 0;
BYTE *buffer, *p;
long cores = 0;
if (GetLogicalProcessorInformationEx(RelationProcessorCore, NULL, &length))
/* This API is unavailable on Windows XP. Resolve it dynamically so the
* i386 compatibility build does not acquire a newer kernel32 import. */
kernel32 = GetModuleHandleA("kernel32.dll");
get_topology = kernel32 == NULL ? NULL :
(get_logical_processor_information_ex_fn)(uintptr_t)
GetProcAddress(kernel32, "GetLogicalProcessorInformationEx");
if (get_topology == NULL)
return 0;
if (get_topology(RelationProcessorCore, NULL, &length))
return 0;
if (GetLastError() != ERROR_INSUFFICIENT_BUFFER || length == 0)
return 0;
buffer = malloc(length);
if (buffer == NULL)
return 0;
if (GetLogicalProcessorInformationEx(RelationProcessorCore,
if (get_topology(RelationProcessorCore,
(PSYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX)buffer, &length)) {
for (p = buffer; p < buffer + length; ) {
PSYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX record =