Fix for configure to detect library correctly.

Fix to check library in use during runtime.
Fix for Bug#16995, "idle connections not being killed due to timeout when NPTL is used".


BUILD/SETUP.sh:
  To avoid warnings during compilation.
configure.in:
  Fixed configure so that it can correctly detect
  between NPTL and Linuxthreads.
include/my_global.h:
  Fix for Linuxthreads.
include/my_pthread.h:
  Added defines for different libraries that can be detected.
  Currently only 'other', 'nptl', and 'lt' (linuxthreads) are
  being used.
  
  changed sigset() and signal() to my_sigset() and my_signal()
include/thr_alarm.h:
  Removed defines for Linuxthreads. This is now detected during
  runtime and handled in the thr_alarm.c
mysys/my_pthread.c:
  Runtime check for library.
mysys/thr_alarm.c:
  Runtime checks for library and corresponding
  signals.
sql/mysqld.cc:
  Added function for detecting thread library in use
  during start-up.
  
  THR_KILL_SIGNAL removed, setting signals during runtime.

1 files changed, 5 insertions, 2 deletions

diff --git a/include/my_global.h b/include/my_global.h
index 37e53c65dec..e6bf9a9b840 100644
--- a/include/my_global.h
+++ b/include/my_global.h
@@ -97,7 +97,7 @@
 
 
 /* Fix problem with S_ISLNK() on Linux */
-#if defined(HAVE_LINUXTHREADS)
+#if defined(TARGET_OS_LINUX) || defined(__GLIBC__)
 #undef  _GNU_SOURCE
 #define _GNU_SOURCE 1
 #endif
@@ -348,7 +348,10 @@ int	__void__;
 #endif
 
 /* Define some useful general macros */
-#if !defined(max)
+#if defined(__cplusplus) && defined(__GNUC__)
+#define max(a, b)     ((a) >? (b))
+#define min(a, b)     ((a) <? (b))
+#elif !defined(max)
 #define max(a, b)	((a) > (b) ? (a) : (b))
 #define min(a, b)	((a) < (b) ? (a) : (b))
 #endif