libglusterfsclient: Wait for all call pools to be destroyed

This ensures that the process using libglusterfsclient does
not exit before all the fops and calls have been replied to.
It helps to ensure that the backends are in a sane state when
the program exits.

Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 279 (File written with booster results in self-heal after dd exits)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=279

1 files changed, 34 insertions, 0 deletions

diff --git a/libglusterfsclient/src/libglusterfsclient.c b/libglusterfsclient/src/libglusterfsclient.c
index 0f2c2dd80..8ed1493fa 100755
--- a/libglusterfsclient/src/libglusterfsclient.c
+++ b/libglusterfsclient/src/libglusterfsclient.c
@@ -1816,11 +1816,45 @@ void glusterfs_log_unlock (void)
 }
 
 
+void
+libgf_wait_for_frames_unwind (libglusterfs_client_ctx_t *ctx)
+{
+        call_pool_t     *pool = NULL;
+        int             canreturn = 0;
+
+        if (!ctx)
+                return;
+
+        pool = (call_pool_t *)ctx->gf_ctx.pool;
+        while (1) {
+                LOCK (&pool->lock);
+                {
+                        if (pool->cnt == 0) {
+                                canreturn = 1;
+                                goto unlock_out;
+                        }
+                }
+unlock_out:
+                UNLOCK (&pool->lock);
+
+                if (canreturn)
+                        break;
+
+                gf_log (LIBGF_XL_NAME, GF_LOG_DEBUG, "Waiting for call frames");
+                sleep (1);
+        }
+
+        return;
+}
+
+
 int 
 glusterfs_fini (glusterfs_handle_t handle)
 {
 	libglusterfs_client_ctx_t *ctx = handle;
 
+        libgf_wait_for_frames_unwind (ctx);
+
 	FREE (ctx->gf_ctx.cmd_args.log_file);
 	FREE (ctx->gf_ctx.cmd_args.volume_file);
 	FREE (ctx->gf_ctx.cmd_args.volume_name);