[PATCH 2/9] libxl: poll: Use poller_get and poller_put for poller_app

[Ian Jackson <ian.jackson@eu.citrix.com>]

This makes the code more regular.  We are going to want to do some
more work in poller_get and poller_put, which work also wants to be
done for poller_app.

Two very minor functional changes:

 * We call malloc an extra time since poller_app is now a pointer

 * ERROR_FAIL on poller_get failing for poller_app is generated in
   libxl_ctx_init rather than passed through by libxl_poller_init
   from libxl__pipe_nonblock.

Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
CC: Jim Fehlig <jfehlig@suse.com>
---
 tools/libxl/libxl.c          |   11 ++++++++---
 tools/libxl/libxl_event.c    |    4 ++--
 tools/libxl/libxl_internal.h |    2 +-
 3 files changed, 11 insertions(+), 6 deletions(-)

diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index e9a2d26..97a60cf 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -59,6 +59,7 @@ int libxl_ctx_alloc(libxl_ctx **pctx, int version,
 
     ctx->osevent_hooks = 0;
 
+    ctx->poller_app = 0;
     LIBXL_LIST_INIT(&ctx->pollers_event);
     LIBXL_LIST_INIT(&ctx->pollers_idle);
 
@@ -103,8 +104,11 @@ int libxl_ctx_alloc(libxl_ctx **pctx, int version,
     rc = libxl__atfork_init(ctx);
     if (rc) goto out;
 
-    rc = libxl__poller_init(gc, &ctx->poller_app);
-    if (rc) goto out;
+    ctx->poller_app = libxl__poller_get(gc);
+    if (!ctx->poller_app) {
+        rc = ERROR_FAIL;
+        goto out;
+    }
 
     ctx->xch = xc_interface_open(lg,lg,0);
     if (!ctx->xch) {
@@ -183,7 +187,8 @@ int libxl_ctx_free(libxl_ctx *ctx)
     if (ctx->xsh) xs_daemon_close(ctx->xsh);
     if (ctx->xce) xc_evtchn_close(ctx->xce);
 
-    libxl__poller_dispose(&ctx->poller_app);
+    libxl__poller_put(ctx, ctx->poller_app);
+    ctx->poller_app = NULL;
     assert(LIBXL_LIST_EMPTY(&ctx->pollers_event));
     libxl__poller *poller, *poller_tmp;
     LIBXL_LIST_FOREACH_SAFE(poller, &ctx->pollers_idle, entry, poller_tmp) {
diff --git a/tools/libxl/libxl_event.c b/tools/libxl/libxl_event.c
index b332dd7..942e02c 100644
--- a/tools/libxl/libxl_event.c
+++ b/tools/libxl/libxl_event.c
@@ -1138,7 +1138,7 @@ int libxl_osevent_beforepoll(libxl_ctx *ctx, int *nfds_io,
 {
     EGC_INIT(ctx);
     CTX_LOCK;
-    int rc = beforepoll_internal(gc, &ctx->poller_app,
+    int rc = beforepoll_internal(gc, ctx->poller_app,
                                  nfds_io, fds, timeout_upd, now);
     CTX_UNLOCK;
     EGC_FREE;
@@ -1291,7 +1291,7 @@ void libxl_osevent_afterpoll(libxl_ctx *ctx, int nfds, const struct pollfd *fds,
 {
     EGC_INIT(ctx);
     CTX_LOCK;
-    afterpoll_internal(egc, &ctx->poller_app, nfds, fds, now);
+    afterpoll_internal(egc, ctx->poller_app, nfds, fds, now);
     CTX_UNLOCK;
     EGC_FREE;
 }
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index d52589e..a33725e 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -401,7 +401,7 @@ struct libxl__ctx {
       /* See the comment for OSEVENT_HOOK_INTERN in libxl_event.c
        * for restrictions on the use of the osevent fields. */
 
-    libxl__poller poller_app; /* libxl_osevent_beforepoll and _afterpoll */
+    libxl__poller *poller_app; /* libxl_osevent_beforepoll and _afterpoll */
     LIBXL_LIST_HEAD(, libxl__poller) pollers_event, pollers_idle;
 
     LIBXL_SLIST_HEAD(libxl__osevent_hook_nexi, libxl__osevent_hook_nexus)
-- 
1.7.10.4