+dnl Check if Berkeley DB supports DB_THREAD
+AC_DEFUN([OL_BERKELEY_DB_THREAD],
+[AC_CACHE_CHECK([for Berkeley DB thread support], [ol_cv_berkeley_db_thread], [
+ ol_LIBS="$LIBS"
+ if test $ol_cv_lib_db != yes ; then
+ LIBS="$ol_cv_lib_db"
+ fi
+
+ AC_TRY_RUN([
+#ifdef HAVE_DB_185_H
+ choke me;
+#else
+#include <db.h>
+#endif
+#ifndef NULL
+#define NULL ((void *)0)
+#endif
+main()
+{
+ int rc;
+ u_int32_t flags = DB_CREATE |
+#ifdef DB_PRIVATE
+ DB_PRIVATE |
+#endif
+ DB_THREAD;
+
+#if DB_VERSION_MAJOR > 2
+ DB_ENV *env = NULL;
+
+ rc = db_env_create( &env, 0 );
+
+ flags |= DB_INIT_MPOOL;
+#ifdef DB_MPOOL_PRIVATE
+ flags |= DB_MPOOL_PRIVATE;
+#endif
+
+ if( rc ) {
+ printf("BerkeleyDB: %s\n", db_strerror(rc) );
+ return rc;
+ }
+
+#if (DB_VERSION_MAJOR > 3) || (DB_VERSION_MINOR >= 1)
+ rc = env->open( env, NULL, flags, 0 );
+#else
+ rc = env->open( env, NULL, NULL, flags, 0 );
+#endif
+
+ if ( rc == 0 ) {
+ rc = env->close( env, 0 );
+ }
+
+ if( rc ) {
+ printf("BerkeleyDB: %s\n", db_strerror(rc) );
+ return rc;
+ }
+
+#else
+ DB_ENV env;
+ memset( &env, '\0', sizeof(env) );
+
+ rc = db_appinit( NULL, NULL, &env, flags );
+
+ if( rc == 0 ) {
+ db_appexit( &env );
+ }
+
+ unlink("__db_mpool.share");
+ unlink("__db_lock.share");
+#endif
+
+ return rc;
+}],
+ [ol_cv_berkeley_db_thread=yes],
+ [ol_cv_berkeley_db_thread=no],
+ [ol_cv_berkeley_db_thread=cross])
+
+ LIBS="$ol_LIBS"
+
+ if test $ol_cv_berkeley_db_thread != no ; then
+ AC_DEFINE(HAVE_BERKELEY_DB_THREAD, 1,
+ [define if Berkeley DB has DB_THREAD support])
+ fi
+])])dnl