[PATCH] socket: avoid exceptions in wrapper code

[Eric Wong <e@80x24.org>]

* ext/socket/lib/socket.rb (Socket.accept_loop): avoid exceptions
  (Socket.udp_server_recv): ditto

Exceptions make debug output noisy and allocations+backtrace
generation hurt performance
---
 ext/socket/lib/socket.rb | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/ext/socket/lib/socket.rb b/ext/socket/lib/socket.rb
index bc3d38a..14f51fa 100644
--- a/ext/socket/lib/socket.rb
+++ b/ext/socket/lib/socket.rb
@@ -790,11 +790,8 @@ def self.accept_loop(*sockets) # :yield: socket, client_addrinfo
     loop {
       readable, _, _ = IO.select(sockets)
       readable.each {|r|
-        begin
-          sock, addr = r.accept_nonblock
-        rescue IO::WaitReadable
-          next
-        end
+        sock, addr = r.accept_nonblock(exception: false)
+        next if sock == :wait_readable
         yield sock, addr
       }
     }
@@ -958,11 +955,8 @@ def self.udp_server_sockets(host=nil, port)
   #
   def self.udp_server_recv(sockets)
     sockets.each {|r|
-      begin
-        msg, sender_addrinfo, _, *controls = r.recvmsg_nonblock
-      rescue IO::WaitReadable
-        next
-      end
+      msg, sender_addrinfo, _, *controls = r.recvmsg_nonblock(exception: false)
+      next if msg == :wait_readable
       ai = r.local_address
       if ai.ipv6? and pktinfo = controls.find {|c| c.cmsg_is?(:IPV6, :PKTINFO) }
         ai = Addrinfo.udp(pktinfo.ipv6_pktinfo_addr.ip_address, ai.ip_port)
-- 
EW