event: rename event_XXX with gf_ prefixed

I hit one crash issue when using the libgfapi.

In the libgfapi it will call glfs_poller() --> event_dispatch()
in file api/src/glfs.c:721, and the event_dispatch() is defined
by libgluster locally, the problem is the name of event_dispatch()
is the extremly the same with the one from libevent package form
the OS.

For example, if a executable program Foo, which will also use and
link the libevent and the libgfapi at the same time, I can hit the
crash, like:

kernel: glfs_glfspoll[68486]: segfault at 1c0 ip 00007fef006fd2b8 sp
00007feeeaffce30 error 4 in libevent-2.0.so.5.1.9[7fef006ed000+46000]

The link for Foo is:
lib_foo_LADD = -levent $(GFAPI_LIBS)
It will crash.

This is because the glfs_poller() is calling the event_dispatch() from
the libevent, not the libglsuter.

The gfapi link info :
GFAPI_LIBS = -lacl -lgfapi -lglusterfs -lgfrpc -lgfxdr -luuid

If I link Foo like:
lib_foo_LADD = $(GFAPI_LIBS) -levent
It will works well without any problem.

And if Foo call one private lib, such as handler_glfs.so, and the
handler_glfs.so will link the GFAPI_LIBS directly, while the Foo won't
and it will dlopen(handler_glfs.so), then the crash will be hit everytime.

The link info will be:
foo_LADD = -levent
libhandler_glfs_LIBADD = $(GFAPI_LIBS)

I can avoid the crash temporarily by linking the GFAPI_LIBS in Foo too like:
foo_LADD = $(GFAPI_LIBS) -levent
libhandler_glfs_LIBADD = $(GFAPI_LIBS)

But this is ugly since the Foo won't use any APIs from the GFAPI_LIBS.

And in some cases when the --as-needed link option is added(on many dists
it is added as default), then the crash is back again, the above workaround
won't work.

Backport of:
> https://review.gluster.org/#/c/glusterfs/+/23110/
> Change-Id: I38f0200b941bd1cff4bf3066fca2fc1f9a5263aa
> Fixes: #699
> Signed-off-by: Xiubo Li <xiubli@redhat.com>

Change-Id: I38f0200b941bd1cff4bf3066fca2fc1f9a5263aa
updates: bz#1740519
Signed-off-by: Xiubo Li <xiubli@redhat.com>
(cherry picked from commit 799edc73c3d4f694c365c6a7c27c9ab8eed5f260)

2 files changed, 4 insertions, 4 deletions

diff --git a/xlators/protocol/client/src/client.c b/xlators/protocol/client/src/client.c
index 94d878a47fd..776e7160c51 100644
--- a/xlators/protocol/client/src/client.c
+++ b/xlators/protocol/client/src/client.c
@@ -2637,8 +2637,8 @@ client_check_event_threads(xlator_t *this, clnt_conf_t *conf, int32_t old,
         return 0;
 
     conf->event_threads = new;
-    return event_reconfigure_threads(this->ctx->event_pool,
-                                     conf->event_threads);
+    return gf_event_reconfigure_threads(this->ctx->event_pool,
+                                        conf->event_threads);
 }
 
 int
diff --git a/xlators/protocol/server/src/server.c b/xlators/protocol/server/src/server.c
index 45a5e96e31a..f79fe26641d 100644
--- a/xlators/protocol/server/src/server.c
+++ b/xlators/protocol/server/src/server.c
@@ -699,7 +699,7 @@ server_check_event_threads(xlator_t *this, server_conf_t *conf, int32_t new)
         return 0;
     }
 
-    return event_reconfigure_threads(pool, target);
+    return gf_event_reconfigure_threads(pool, target);
 }
 
 int
@@ -1005,7 +1005,7 @@ server_cleanup(xlator_t *this, server_conf_t *conf)
 
     if (this->ctx->event_pool) {
         /* Free the event pool */
-        (void)event_pool_destroy(this->ctx->event_pool);
+        (void)gf_event_pool_destroy(this->ctx->event_pool);
     }
 
     if (dict_get_sizen(this->options, "config-directory")) {