rcu: add rcu library

This includes a (mangled) copy of the liburcu code.  The main changes
are: 1) removing dependencies on many other header files in liburcu; 2)
removing for simplicity the tentative busy waiting in synchronize_rcu,
which has limited performance effects; 3) replacing futexes in
synchronize_rcu with QemuEvents for Win32 portability.  The API is
the same as liburcu, so it should be possible in the future to require
liburcu on POSIX systems for example and use our copy only on Windows.

Among the various versions available I chose urcu-mb, which is the
least invasive implementation even though it does not have the
fastest rcu_read_{lock,unlock} implementation.  The urcu flavor can
be changed later, after benchmarking.

Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 0 insertions, 3 deletions

diff --git a/include/qemu/thread.h b/include/qemu/thread.h
index e89fdc9..5114ec8 100644
--- a/include/qemu/thread.h
+++ b/include/qemu/thread.h
@@ -25,9 +25,6 @@ void qemu_mutex_lock(QemuMutex *mutex);
 int qemu_mutex_trylock(QemuMutex *mutex);
 void qemu_mutex_unlock(QemuMutex *mutex);
 
-#define rcu_read_lock() do { } while (0)
-#define rcu_read_unlock() do { } while (0)
-
 void qemu_cond_init(QemuCond *cond);
 void qemu_cond_destroy(QemuCond *cond);