Revert "Fix: bump minimal urcu dependency to 0.11"

This reverts commit 15076a788437a143af0b3841ce2b223fba2cbf29 to bring
back the dependency on liburcu back to version 0.9. This only works if
liburcu is custom-modified to include the worker thread for the
lock-free hash table.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Change-Id: I34d15da476a099f6cfb76faf2216478c1c8b8eed

diff --git a/README.md b/README.md
index 6c67291d6a4af0ed98ffa4522418eb54f2df6a4b..92df20daf48c94d410c56ebda8580cd1cbb26052 100644 (file)
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ components:
     that, the kernel version may probably be older, but we can't provide
     any guarantee. Please let us know if you are able to go lower
     without any problems.
-  - **[`liburcu`](http://www.liburcu.org/) >= 0.11.0**: userspace RCU library,
+  - **[`liburcu`](http://www.liburcu.org/) >= 0.9.0**: userspace RCU library,
     by Mathieu Desnoyers and Paul E. McKenney.
   - **`libpopt` >= 1.13**:  command line arguments parsing library.
     - Debian/Ubuntu package: `libpopt-dev`

diff --git a/configure.ac b/configure.ac
index 4325104c49c05ff0e2b9cca2284fb8c285b72e39..b23833dfee78b2f41d09fdf1f759625e83439f4a 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -479,7 +479,7 @@ PKG_CHECK_MODULES([libxml2], [libxml-2.0 >= 2.7.6])
 AC_CHECK_FUNC([clock_gettime], [AC_DEFINE_UNQUOTED([LTTNG_HAVE_CLOCK_GETTIME], 1, [Has clock_gettime() support.])])
 
 # URCU library version needed or newer
-m4_define([WRONG_LIBURCU_MSG], [Userspace RCU (liburcu) >= 0.11.0 is needed])
+m4_define([WRONG_LIBURCU_MSG], [Userspace RCU (liburcu) >= 0.9.0 is needed])
 
 # Check liburcu needed function calls
 AC_CHECK_DECL([cds_list_add], [],
@@ -504,9 +504,9 @@ AC_CHECK_DECL([cmm_smp_mb__before_uatomic_or], [],
         [AC_MSG_ERROR([WRONG_LIBURCU_MSG])], [[#include <urcu.h>]]
 )
 
-#Function added in urcu 0.11.0
-AC_CHECK_DECL([urcu_memb_barrier], [],
-        [AC_MSG_ERROR([WRONG_LIBURCU_MSG])], [[#include <urcu/urcu-memb.h>]]
+#Function added in urcu 0.9.0
+AC_CHECK_DECL([urcu_ref_get_unless_zero], [],
+        [AC_MSG_ERROR([WRONG_LIBURCU_MSG])], [[#include <urcu/ref.h>]]
 )
 
 # Check for libkmod, it will be auto-neabled if found but won't fail if it's not,