Implement nproc for mingw.

1 files changed, 14 insertions, 0 deletions

diff --git a/lib/nproc.c b/lib/nproc.c
index 04a047cfb4..b5a70b193a 100644
--- a/lib/nproc.c
+++ b/lib/nproc.c
@@ -41,6 +41,11 @@
 # include <sys/sysctl.h>
 #endif
 
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>
+#endif
+
 #define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
 
 /* Return the total number of processors.  The result is guaranteed to
@@ -90,5 +95,14 @@ num_processors (void)
   }
 #endif
 
+#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
+  { /* This works on native Windows platforms.  */
+    SYSTEM_INFO system_info;
+    GetSystemInfo (&system_info);
+    if (0 < system_info.dwNumberOfProcessors)
+      return system_info.dwNumberOfProcessors;
+  }
+#endif
+
   return 1;
 }