enable for lock checks.

git-svn-id: file:///svn/unbound/trunk@514 be551aaa-1e26-0410-a405-d3ace91eadb9

configure.ac

@@ -481,6 +481,14 @@ if test x_$enable_static_exe = x_yes; then
 	staticexe="-static"
 fi
 
+# set lock checking if requested
+AC_ARG_ENABLE(lock_checks, AC_HELP_STRING([--enable-lock-checks],
+	[ enable to check lock and unlock calls, for debug purposes ]), 
+	, )
+if test x_$enable_lock_checks = x_yes; then
+	AC_DEFINE(ENABLE_LOCK_CHECKS, 1, [Define if you want to use debug lock checking (slow).])
+fi
+
 # check to see if libraries are needed for these functions.
 AC_CHECK_LIB(socket, socket)
 AC_CHECK_LIB(nsl, inet_pton)

doc/Changelog

@@ -5,6 +5,7 @@
 	- accounting of memory improved
 	- outbound entries are allocated in the query region they are for.
 	- extensive debugging for memory allocations.
+	- --enable-lock-checks can be used to enable lock checking.
 
 13 August 2007: Wouter
 	- fixup makefile, if lexer is missing give nice error and do not

doc/README

@@ -28,6 +28,9 @@ This software is under BSD license, see LICENSE for details.
   * --enable-static-exe
 	This enables a debug option to statically link, against ldns and 
 	libevent libraries.
+  * --enable-lock-checks
+  	This enables a debug option to check lock and unlock calls. It needs
+	a recent pthreads library to work.
 
 Known issues
 ------------

util/locks.h

@@ -70,7 +70,7 @@
  	} while(0)
 
 /** DEBUG: use thread debug whenever possible */
-#if defined(HAVE_PTHREAD) && defined(HAVE_PTHREAD_SPINLOCK_T)
+#if defined(HAVE_PTHREAD) && defined(HAVE_PTHREAD_SPINLOCK_T) && defined(ENABLE_LOCK_CHECKS)
 #  define USE_THREAD_DEBUG
 #endif