1 files changed, 45 insertions, 0 deletions
diff --git a/nonportable.c b/nonportable.c
index 150b0c0..5fcb1b8 100644
--- a/nonportable.c
+++ b/nonportable.c
@@ -134,6 +134,51 @@ pthread_delay_np (struct timespec * interval)
 }
 
 
+/*
+ * pthread_getprocessors_np()
+ *
+ * Get the number of CPUs available to the process.
+ *
+ * If the available number of CPUs is 1 then pthread_spin_lock()
+ * will block rather than spin if the lock is already owned.
+ *
+ * pthread_spin_init() calls this routine when initialising
+ * a spinlock. If the number of available processors changes
+ * (after a call to SetProcessAffinityMask()) then only
+ * newly initialised spinlocks will notice.
+ */
+int
+pthread_getprocessors_np(int * count)
+{
+  DWORD vProcessCPUs;
+  DWORD vSystemCPUs;
+  int result = 0;
+
+  if (GetProcessAffinityMask(GetCurrentProcess(),
+                             &vProcessCPUs,
+                             &vSystemCPUs))
+    {
+      DWORD bit;
+      int CPUs = 0;
+
+      for (bit = 1; bit != 0; bit <<= 1)
+        {
+          if (vProcessCPUs & bit)
+            {
+              CPUs++;
+            }
+        }
+      *count = CPUs;
+    }
+  else
+    {
+      result = EAGAIN;
+    }
+
+  return(result);
+}
+
+
 BOOL
 pthread_win32_process_attach_np ()
 {