Xen devel - Nov 2013 - [PATCH 1/2] opw: libxl: add convenience macros to qmp_send() in libxl_qmp.c

Update qmp_send() in libxl_qmp.c to use the new convenience macros
declared in libxl_internal.h. Uses GC_INIT at the top of the function,
and GC_FREE at the exit. Since GC_INIT returns a libxl__gc by reference
and not by value, remove the address operator from the left of the
variable gc where it is passed as a parameter.

Signed-off-by: Kelley Nielsen <kelleynnn@gmail.com>
Suggested-by: Anthony PERARD <anthony.perard@citrix.com>
---
 tools/libxl/libxl_qmp.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/libxl/libxl_qmp.c b/tools/libxl/libxl_qmp.c
index ee6d06f..b41d583 100644
--- a/tools/libxl/libxl_qmp.c
+++ b/tools/libxl/libxl_qmp.c
@@ -568,9 +568,9 @@ static int qmp_send(libxl__qmp_handler *qmp,
 {
     char *buf = NULL;
     int rc = -1;
-    libxl__gc gc; LIBXL_INIT_GC(gc,qmp->ctx);
+    GC_INIT(qmp->ctx);
 
-    buf = qmp_send_prepare(&gc, qmp, cmd, args, callback, opaque, context);
+    buf = qmp_send_prepare(gc, qmp, cmd, args, callback, opaque, context);
 
     if (buf == NULL) {
         goto out;
@@ -585,7 +585,7 @@ static int qmp_send(libxl__qmp_handler *qmp,
 
     rc = qmp->last_id_used;
 out:
-    libxl__free_all(&gc);
+    GC_FREE;
     return rc;
 }
 
-- 
1.8.1.2

The new coding style uses the convenience macro CTX as declared in
libxl_internal.h. Substitute an invocation of this macro for its body
at the one place it occurs in libxl_qmp.c.

Signed-off-by: Kelley Nielsen <kelleynnn@gmail.com>
Suggested-by: Anthony PERARD <anthony.perard@citrix.com>
---
 tools/libxl/libxl_qmp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/libxl/libxl_qmp.c b/tools/libxl/libxl_qmp.c
index b41d583..8d3215c 100644
--- a/tools/libxl/libxl_qmp.c
+++ b/tools/libxl/libxl_qmp.c
@@ -356,7 +356,7 @@ static libxl__qmp_handler *qmp_init_handler(libxl__gc *gc,
uint32_t domid)
         LOGE(ERROR, "Failed to allocate qmp_handler");
         return NULL;
     }
-    qmp->ctx = libxl__gc_owner(gc);
+    qmp->ctx = CTX;
     qmp->domid = domid;
     qmp->timeout = 5;
 
-- 
1.8.1.2

On Mon, 2013-11-11 at 02:08 -0800, Kelley Nielsen wrote:
> Update qmp_send() in libxl_qmp.c to use the new convenience macros
> declared in libxl_internal.h. Uses GC_INIT at the top of the function,
> and GC_FREE at the exit. Since GC_INIT returns a libxl__gc by reference
> and not by value, remove the address operator from the left of the
> variable gc where it is passed as a parameter.
> 
> Signed-off-by: Kelley Nielsen <kelleynnn@gmail.com>
> Suggested-by: Anthony PERARD <anthony.perard@citrix.com>
I''m dubious about whether qmp_send should be creating itself a gc
rather
than receiving one as a parameter, but given that it does it should use
the macros:

Acked-by: Ian Campbell <ian.campbell@citrix.com>

and committed.

(NB, the tag things are more normally chronological, i.e. suggested-by
first, then s-o-b, hence I reordered upon commit).

(NB2, I think the OPW tag isn''t so useful for the actual commit log,
inside the patch prefix i.e. [PATCH OPW ...] would be better, git
send-email --subject-preifx=''PATCH OPW'' would do the trick)

Ian