From ec221d174f298452ad23c1cb97e49c953489a4c7 Mon Sep 17 00:00:00 2001
From: root <root>
Date: Sun, 6 Apr 2008 09:53:16 +0000
Subject: *** empty log message ***

---
 ev.c | 111 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-----------
 1 file changed, 93 insertions(+), 18 deletions(-)

(limited to 'ev.c')

diff --git a/ev.c b/ev.c
index 4475386..3c4d5b4 100644
--- a/ev.c
+++ b/ev.c
@@ -41,6 +41,7 @@
 extern "C" {
 #endif
 
+/* this big block deduces configuration from config.h */
 #ifndef EV_STANDALONE
 # ifdef EV_CONFIG_H
 #  include EV_CONFIG_H
@@ -120,6 +121,14 @@ extern "C" {
 #  endif
 # endif
 
+# ifndef EV_USE_EVENTFD
+#  if HAVE_EVENTFD
+#   define EV_USE_EVENTFD 1
+#  else
+#   define EV_USE_EVENTFD 0
+#  endif
+# endif
+   
 #endif
 
 #include <math.h>
@@ -154,7 +163,7 @@ extern "C" {
 # endif
 #endif
 
-/**/
+/* this block tries to deduce configuration from header-defined symbols and defaults */
 
 #ifndef EV_USE_MONOTONIC
 # define EV_USE_MONOTONIC 0
@@ -181,7 +190,11 @@ extern "C" {
 #endif
 
 #ifndef EV_USE_EPOLL
-# define EV_USE_EPOLL 0
+# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
+#  define EV_USE_EPOLL 1
+# else
+#  define EV_USE_EPOLL 0
+# endif
 #endif
 
 #ifndef EV_USE_KQUEUE
@@ -193,7 +206,11 @@ extern "C" {
 #endif
 
 #ifndef EV_USE_INOTIFY
-# define EV_USE_INOTIFY 0
+# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 4))
+#  define EV_USE_INOTIFY 1
+# else
+#  define EV_USE_INOTIFY 0
+# endif
 #endif
 
 #ifndef EV_PID_HASHSIZE
@@ -212,7 +229,15 @@ extern "C" {
 # endif
 #endif
 
-/**/
+#ifndef EV_USE_EVENTFD
+# if __linux && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 7))
+#  define EV_USE_EVENTFD 1
+# else
+#  define EV_USE_EVENTFD 0
+# endif
+#endif
+
+/* this block fixes any misconfiguration where we know we run into trouble otherwise */
 
 #ifndef CLOCK_MONOTONIC
 # undef EV_USE_MONOTONIC
@@ -243,6 +268,11 @@ extern "C" {
 # include <winsock.h>
 #endif
 
+#if EV_USE_EVENTFD
+/* our minimum requirement is glibc 2.7 which has the stub, but not the header */
+int eventfd (unsigned int initval, int flags);
+#endif
+
 /**/
 
 /*
@@ -804,13 +834,24 @@ evpipe_init (EV_P)
 {
   if (!ev_is_active (&pipeev))
     {
-      while (pipe (evpipe))
-        syserr ("(libev) error creating signal/async pipe");
+#if EV_USE_EVENTFD
+      if ((evfd = eventfd (0, 0)) >= 0)
+        {
+          evpipe [0] = -1;
+          fd_intern (evfd);
+          ev_io_set (&pipeev, evfd, EV_READ);
+        }
+      else
+#endif
+        {
+          while (pipe (evpipe))
+            syserr ("(libev) error creating signal/async pipe");
 
-      fd_intern (evpipe [0]);
-      fd_intern (evpipe [1]);
+          fd_intern (evpipe [0]);
+          fd_intern (evpipe [1]);
+          ev_io_set (&pipeev, evpipe [0], EV_READ);
+        }
 
-      ev_io_set (&pipeev, evpipe [0], EV_READ);
       ev_io_start (EV_A_ &pipeev);
       ev_unref (EV_A); /* watcher should not keep loop alive */
     }
@@ -824,7 +865,16 @@ evpipe_write (EV_P_ EV_ATOMIC_T *flag)
       int old_errno = errno; /* save errno because write might clobber it */
 
       *flag = 1;
-      write (evpipe [1], &old_errno, 1);
+
+#if EV_USE_EVENTFD
+      if (evfd >= 0)
+        {
+          uint64_t counter = 1;
+          write (evfd, &counter, sizeof (uint64_t));
+        }
+      else
+#endif
+        write (evpipe [1], &old_errno, 1);
 
       errno = old_errno;
     }
@@ -833,10 +883,18 @@ evpipe_write (EV_P_ EV_ATOMIC_T *flag)
 static void
 pipecb (EV_P_ ev_io *iow, int revents)
 {
-  {
-    int dummy;
-    read (evpipe [0], &dummy, 1);
-  }
+#if EV_USE_EVENTFD
+  if (evfd >= 0)
+    {
+      uint64_t counter = 1;
+      read (evfd, &counter, sizeof (uint64_t));
+    }
+  else
+#endif
+    {
+      char dummy;
+      read (evpipe [0], &dummy, 1);
+    }
 
   if (gotsig && ev_is_default_loop (EV_A))
     {    
@@ -1141,8 +1199,16 @@ loop_destroy (EV_P)
       ev_ref (EV_A); /* signal watcher */
       ev_io_stop (EV_A_ &pipeev);
 
-      close (evpipe [0]); evpipe [0] = 0;
-      close (evpipe [1]); evpipe [1] = 0;
+#if EV_USE_EVENTFD
+      if (evfd >= 0)
+        close (evfd);
+#endif
+
+      if (evpipe [0] >= 0)
+        {
+          close (evpipe [0]);
+          close (evpipe [1]);
+        }
     }
 
 #if EV_USE_INOTIFY
@@ -1226,8 +1292,17 @@ loop_fork (EV_P)
 
       ev_ref (EV_A);
       ev_io_stop (EV_A_ &pipeev);
-      close (evpipe [0]);
-      close (evpipe [1]);
+
+#if EV_USE_EVENTFD
+      if (evfd >= 0)
+        close (evfd);
+#endif
+
+      if (evpipe [0] >= 0)
+        {
+          close (evpipe [0]);
+          close (evpipe [1]);
+        }
 
       evpipe_init (EV_A);
       /* now iterate over everything, in case we missed something */
-- 
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