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.
     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`
     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
 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], [],
 
 # 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>]]
 )
 
         [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,
 )
 
 # Check for libkmod, it will be auto-neabled if found but won't fail if it's not,