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-rw-r--r--ext/etc/etc.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/ext/etc/etc.c b/ext/etc/etc.c
index 6168ed15106..25465607137 100644
--- a/ext/etc/etc.c
+++ b/ext/etc/etc.c
@@ -891,6 +891,38 @@ io_pathconf(VALUE io, VALUE arg)
#define io_pathconf rb_f_notimplement
#endif
+#if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)
+/*
+ * Returns the number of online processors.
+ *
+ * The result is intended as the number of processes to
+ * use all available processors.
+ *
+ * This method is implemented as:
+ * - sysconf(_SC_NPROCESSORS_ONLN): GNU/Linux, NetBSD, FreeBSD, OpenBSD, DragonFly BSD, OpenIndiana, Mac OS X, AIX
+ *
+ * Example:
+ *
+ * require 'etc'
+ * p Etc.nprocessors #=> 4
+ *
+ */
+static VALUE
+etc_nprocessors(VALUE obj)
+{
+ long ret;
+
+ errno = 0;
+ ret = sysconf(_SC_NPROCESSORS_ONLN);
+ if (ret == -1) {
+ rb_sys_fail("sysconf(_SC_NPROCESSORS_ONLN)");
+ }
+ return LONG2NUM(ret);
+}
+#else
+#define etc_nprocessors rb_f_notimplement
+#endif
+
/*
* The Etc module provides access to information typically stored in
* files in the /etc directory on Unix systems.
@@ -946,6 +978,7 @@ Init_etc(void)
rb_define_module_function(mEtc, "sysconf", etc_sysconf, 1);
rb_define_module_function(mEtc, "confstr", etc_confstr, 1);
rb_define_method(rb_cIO, "pathconf", io_pathconf, 1);
+ rb_define_module_function(mEtc, "nprocessors", etc_nprocessors, 0);
sPasswd = rb_struct_define_under(mEtc, "Passwd",
"name",