diff options
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | ext/etc/etc.c | 33 | ||||
| -rw-r--r-- | test/etc/test_etc.rb | 5 |
3 files changed, 44 insertions, 0 deletions
@@ -1,3 +1,9 @@ +Thu Oct 2 12:21:52 2014 Tanaka Akira <akr@fsij.org> + + * ext/etc/etc.c (etc_nprocessors): New method. + Accepted by matz at RubyKaigi 2014. + [ruby-core:65142] [Feature #10267] + Thu Oct 2 07:56:49 2014 Eric Wong <e@80x24.org> * iseq.c (rb_iseq_line_trace_each): explicit cast diff --git a/ext/etc/etc.c b/ext/etc/etc.c index 6168ed1510..2546560713 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", diff --git a/test/etc/test_etc.rb b/test/etc/test_etc.rb index 4a099e7df5..2f61ac7919 100644 --- a/test/etc/test_etc.rb +++ b/test/etc/test_etc.rb @@ -159,4 +159,9 @@ class TestEtc < Test::Unit::TestCase } end if defined?(Etc::PC_PIPE_BUF) + def test_nprocessors + n = Etc.nprocessors + assert_operator(1, :<=, n) + end + end |