[PATCH 5/4] ntdll: Read the current processor with the __NR_getcpu syscall

[Detlef Riekenberg]

I tested sched_getcpu() also, but that is a glibc extension which does not work on 64bit

--
By by ... Detlef
---
 dlls/ntdll/thread.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/dlls/ntdll/thread.c b/dlls/ntdll/thread.c
index 25f091c..a53136d 100644
--- a/dlls/ntdll/thread.c
+++ b/dlls/ntdll/thread.c
@@ -30,6 +30,9 @@
 #ifdef HAVE_SYS_TIMES_H
 #include <sys/times.h>
 #endif
+#ifdef HAVE_SYS_SYSCALL_H
+#include <sys/syscall.h>
+#endif
 
 #define NONAMELESSUNION
 #include "ntstatus.h"
@@ -1184,6 +1187,16 @@ ULONG WINAPI NtGetCurrentProcessorNumber(void)
 {
     unsigned processor = 0;
 
+    /* the syscall is a linux extension, but SYS_getcpu is not defined for 64bit wordsize */
+#if defined(__linux__) && defined(__NR_getcpu)
+    int res;
+
+    res = syscall(__NR_getcpu, &processor, NULL, NULL);
+    if (res != -1)
+        return (ULONG) processor;
+
+#endif
+
     if (NtCurrentTeb()->Peb->NumberOfProcessors > 1) {
         ULONG_PTR thread_mask;
         ULONG_PTR processor_mask;
@@ -1192,6 +1205,7 @@ ULONG WINAPI NtGetCurrentProcessorNumber(void)
         status = NtQueryInformationThread(GetCurrentThread(), ThreadAffinityMask, &thread_mask, sizeof(thread_mask), NULL);
         if (status == STATUS_SUCCESS)
         {
+            processor = 0;
             while (processor < (NtCurrentTeb()->Peb->NumberOfProcessors))
             {
                 processor_mask = (1 << processor);
-- 
1.7.5.4