From 5875fce6ce678c444456cc7eed6f28ef000dac24 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@atdot.net>
Date: Thu, 2 Mar 2023 18:27:44 +0900
Subject: `Ractor::Selector#empty?`

It returns the waiting set is empty or not.

Also add Ractor::Selector's tests.
---
 ractor.rb | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'ractor.rb')

diff --git a/ractor.rb b/ractor.rb
index 6c57d65f87..5620eeec38 100644
--- a/ractor.rb
+++ b/ractor.rb
@@ -428,6 +428,18 @@ class Ractor
       __builtin_ractor_selector_clear
     end
 
+    # call-seq:
+    #   selector.empty?
+    #
+    # Returns true if the number of ractors in the waiting set at the current time is zero.
+    #
+    # Note that even if <tt>#empty?</tt> returns false, the subsequent <tt>#wait</tt>
+    # may raise an exception because other ractors may close the target ractors.
+    #
+    def empty?
+      __builtin_ractor_selector_empty_p
+    end
+
     # call-seq:
     #   selector.wait(receive: false, yield_value: yield_value, move: false) -> [ractor or symbol, value]
     #
-- 
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