From a9b860765d84b975bf1165ccc0dac2ff3c1789ae Mon Sep 17 00:00:00 2001
From: Yang Tse <yangsita@gmail.com>
Date: Tue, 26 Jan 2010 08:43:21 +0000
Subject: [PATCH] onstantine Sapuntzakis threaded resolver enhancements

---
 lib/hostthre.c |  4 ----
 lib/setup.h    | 47 ++++++++++++++++++++++-------------------------
 2 files changed, 22 insertions(+), 29 deletions(-)

diff --git a/lib/hostthre.c b/lib/hostthre.c
index 2205c8fdd..9772351c1 100644
--- a/lib/hostthre.c
+++ b/lib/hostthre.c
@@ -84,10 +84,6 @@
 /* The last #include file should be: */
 #include "memdebug.h"
 
-#if defined(_MSC_VER) && defined(CURL_NO__BEGINTHREADEX)
-#pragma message ("No _beginthreadex() available in this RTL")
-#endif
-
 /***********************************************************************
  * Only for threaded name resolves builds
  **********************************************************************/
diff --git a/lib/setup.h b/lib/setup.h
index 980a91699..ced3face5 100644
--- a/lib/setup.h
+++ b/lib/setup.h
@@ -428,36 +428,37 @@
 /*         CURLRES_* defines to use in the host*.c sources          */
 /* ---------------------------------------------------------------- */
 
-#if defined(WIN32) && !defined(__CYGWIN__) && !defined(USE_ARES) && \
-    !defined(__LCC__)  /* lcc-win32 doesn't have _beginthreadex() */
-#ifdef ENABLE_IPV6
-#define USE_THREADING_GETADDRINFO
-#else
-#define USE_THREADING_GETHOSTBYNAME  /* Cygwin uses alarm() function */
-#endif
+/*
+ * lcc-win32 doesn't have _beginthreadex(), lacks threads support.
+ */
+
+#if defined(__LCC__) && defined(WIN32)
+#  undef USE_THREADS_POSIX
+#  undef USE_THREADS_WIN32
 #endif
 
-/* "cl -ML" or "cl -MLd" implies a single-threaded runtime library where
-   _beginthreadex() is not available */
-#if (defined(_MSC_VER) && !defined(__POCC__)) && !defined(_MT) && !defined(USE_ARES)
-#undef USE_THREADING_GETADDRINFO
-#undef USE_THREADING_GETHOSTBYNAME
-#define CURL_NO__BEGINTHREADEX
+/*
+ * MSVC threads support requires a multi-threaded runtime library.
+ * _beginthreadex() is not available in single-threaded ones.
+ */
+
+#if defined(_MSC_VER) && !defined(__POCC__) && !defined(_MT)
+#  undef USE_THREADS_POSIX
+#  undef USE_THREADS_WIN32
 #endif
 
+/*
+ * Mutually exclusive CURLRES_* definitions.
+ */
+
 #ifdef USE_ARES
 #  define CURLRES_ASYNCH
 #  define CURLRES_ARES
-#endif
-
-#ifdef USE_THREADING_GETHOSTBYNAME
-#  define CURLRES_ASYNCH
-#  define CURLRES_THREADED
-#endif
-
-#ifdef USE_THREADING_GETADDRINFO
+#elif defined(USE_THREADS_POSIX) || defined(USE_THREADS_WIN32)
 #  define CURLRES_ASYNCH
 #  define CURLRES_THREADED
+#else
+#  define CURLRES_SYNCH
 #endif
 
 #ifdef ENABLE_IPV6
@@ -466,10 +467,6 @@
 #  define CURLRES_IPV4
 #endif
 
-#ifndef CURLRES_ASYNCH
-#  define CURLRES_SYNCH
-#endif
-
 /* ---------------------------------------------------------------- */
 
 /*