Merge branch 'master' into urcu/ht

[urcu.git] / README

diff --git a/README b/README
index 7d97f1964674407ddb23c069e3024ea7dc2cfdd7..1e76f2d1b098bb9579d573fcf8f36211c3c7c5f9 100644 (file)
--- a/README
+++ b/README
@@ -8,6 +8,7 @@ BUILDING
        ./configure
        make
        make install
+       ldconfig
 
        Hints:  Forcing 32-bit build:
                * CFLAGS="-m32 -g -O2" ./configure
@@ -38,6 +39,8 @@ supported, with the following exceptions:
   therefore not compatible with liburcu on x86 32-bit (i386, i486, i586, i686).
   The problem has been reported to the gcc community:
     http://www.mail-archive.com/gcc-bugs@gcc.gnu.org/msg281255.html
+- gcc 3.3 cannot match the "xchg" instruction on 32-bit x86 build.
+  See: http://kerneltrap.org/node/7507
 - Alpha, ia64 and ARM architectures depend on 4.x gcc with atomic builtins
   support.
 
@@ -139,6 +142,22 @@ Usage of liburcu-defer
        * Its API is currently experimental. It may change in future library
          releases.
 
+Usage of urcu-call-rcu
+
+       * Follow instructions for either liburcu, liburcu-qsbr,
+         liburcu-mb, liburcu-signal, or liburcu-bp above.
+         The urcu-call-rcu functionality is provided for each of
+         these library modules.
+       * Provides the call_rcu() primitive to enqueue delayed callbacks
+         in a manner similar to defer_rcu(), but without ever delaying
+         for a grace period.  On the other hand, call_rcu()'s best-case
+         overhead is not quite as good as that of defer_rcu().
+       * Provides call_rcu() to allow asynchronous handling of RCU
+         grace periods.  A number of additional functions are provided
+         to manage the helper threads used by call_rcu(), but reasonable
+         defaults are used if these additional functions are not invoked.
+         See API.txt for more details.
+
 Being careful with signals
 
        The liburcu library uses signals internally. The signal handler is