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#1740525
Signed-off-by: Xiubo Li <xiubli@redhat.com>
(cherry picked from commit 799edc73c3d4f694c365c6a7c27c9ab8eed5f260)

1 files changed, 5 insertions, 5 deletions

diff --git a/api/src/glfs.c b/api/src/glfs.c
index f26affbd475..cc2e5cc5b40 100644
--- a/api/src/glfs.c
+++ b/api/src/glfs.c
@@ -91,8 +91,8 @@ glusterfs_ctx_defaults_init(glusterfs_ctx_t *ctx)
         goto err;
     }
 
-    ctx->event_pool = event_pool_new(DEFAULT_EVENT_POOL_SIZE,
-                                     STARTING_EVENT_THREADS);
+    ctx->event_pool = gf_event_pool_new(DEFAULT_EVENT_POOL_SIZE,
+                                        STARTING_EVENT_THREADS);
     if (!ctx->event_pool) {
         goto err;
     }
@@ -724,7 +724,7 @@ glfs_poller(void *data)
 
     fs = data;
 
-    event_dispatch(fs->ctx->event_pool);
+    gf_event_dispatch(fs->ctx->event_pool);
 
     return NULL;
 }
@@ -1188,7 +1188,7 @@ glusterfs_ctx_destroy(glusterfs_ctx_t *ctx)
     }
 
     /* Free the event pool */
-    ret = event_pool_destroy(ctx->event_pool);
+    ret = gf_event_pool_destroy(ctx->event_pool);
 
     /* Free the iobuf pool */
     iobuf_pool_destroy(ctx->iobuf_pool);
@@ -1357,7 +1357,7 @@ pub_glfs_fini(struct glfs *fs)
         syncenv_destroy(ctx->env);
 
         /* Join the poller thread */
-        if (event_dispatch_destroy(ctx->event_pool) < 0)
+        if (gf_event_dispatch_destroy(ctx->event_pool) < 0)
             ret = -1;
     }