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.

Fixes: #699

Change-Id: I38f0200b941bd1cff4bf3066fca2fc1f9a5263aa
Signed-off-by: Xiubo Li <xiubli@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/glusterfsd/src/glusterfsd.c b/glusterfsd/src/glusterfsd.c
index 8773f2d8536..cf6d9a7215c 100644
--- a/glusterfsd/src/glusterfsd.c
+++ b/glusterfsd/src/glusterfsd.c
@@ -1766,8 +1766,8 @@ glusterfs_ctx_defaults_init(glusterfs_ctx_t *ctx)
         goto out;
     }
 
-    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) {
         gf_msg("", GF_LOG_CRITICAL, 0, glusterfsd_msg_14,
                "ERROR: glusterfs event pool creation failed");
@@ -2914,7 +2914,7 @@ main(int argc, char *argv[])
     if (ret)
         goto out;
 
-    ret = event_dispatch(ctx->event_pool);
+    ret = gf_event_dispatch(ctx->event_pool);
 
 out:
     //    glusterfs_ctx_destroy (ctx);