Alex Henrie : kernel32: Reimplement GetMaximumProcessorCount on top of GetLogicalProcessorInformationEx.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 04114db90bf1abc5079417cfa948a3e9ab7a413d
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=04114db90bf1abc5079417cfa...

Author: Alex Henrie 
Date:   Mon May 24 02:10:43 2021 -0600

kernel32: Reimplement GetMaximumProcessorCount on top of GetLogicalProcessorInformationEx.

Signed-off-by: Alex Henrie 
Signed-off-by: Alexandre Julliard

---

dlls/kernel32/process.c | 27 +++++++++++++++++++++++++--
 1 file changed, 25 insertions(+), 2 deletions(-)

diff --git a/dlls/kernel32/process.c b/dlls/kernel32/process.c
index acdedd979f3..6de094950e3 100644
--- a/dlls/kernel32/process.c
+++ b/dlls/kernel32/process.c
@@ -668,9 +668,32 @@ DWORD WINAPI GetActiveProcessorCount(WORD group)
  */
 DWORD WINAPI GetMaximumProcessorCount(WORD group)
 {
-    DWORD cpus = system_info.NumberOfProcessors;
+    DWORD cpus = 0;
+    DWORD size = 0;
+    SYSTEM_LOGICAL_PROCESSOR_INFORMATION_EX *info;

-    FIXME("(0x%x): semi-stub, returning %u\n", group, cpus);
+    TRACE("(0x%x)\n", group);
+
+    if (!GetLogicalProcessorInformationEx(RelationGroup, NULL, &size)) return 0;
+    if (!(info = HeapAlloc(GetProcessHeap(), 0, size))) return 0;
+    if (!GetLogicalProcessorInformationEx(RelationGroup, info, &size))
+    {
+        HeapFree(GetProcessHeap(), 0, info);
+        return 0;
+    }
+
+    if (group == ALL_PROCESSOR_GROUPS)
+    {
+        for (group = 0; group < info->Group.ActiveGroupCount; group++)
+            cpus += info->Group.GroupInfo[group].MaximumProcessorCount;
+    }
+    else
+    {
+        if (group < info->Group.ActiveGroupCount)
+            cpus = info->Group.GroupInfo[group].MaximumProcessorCount;
+    }
+
+    HeapFree(GetProcessHeap(), 0, info);
     return cpus;
 }