Initialize participant on first use. Destroy participant after last node is destroyed. (#176)

* Initialize participant on first use. Destroy participant after last node is destroyed

Signed-off-by: Ivan Santiago Paunovic <ivanpauno@ekumenlabs.com>

* Please linters

Signed-off-by: Ivan Santiago Paunovic <ivanpauno@ekumenlabs.com>

* Solve problems with guard conditions

Signed-off-by: Ivan Santiago Paunovic <ivanpauno@ekumenlabs.com>

* Address peer review comments

Signed-off-by: Ivan Santiago Paunovic <ivanpauno@ekumenlabs.com>

* Address peer review comments

Signed-off-by: Ivan Santiago Paunovic <ivanpauno@ekumenlabs.com>

* Used DDS_CYCLONEDDS_HANDLE to create all guard conditions

Signed-off-by: Ivan Santiago Paunovic <ivanpauno@ekumenlabs.com>

* Increase ref count always

Signed-off-by: Ivan Santiago Paunovic <ivanpauno@ekumenlabs.com>

rmw_cyclonedds_cpp/src/rmw_node.cpp

@@ -151,7 +151,7 @@ static rmw_subscription_t * create_subscription(
 );
 static rmw_ret_t destroy_subscription(rmw_subscription_t * subscription);
 
-static rmw_guard_condition_t * create_guard_condition(rmw_context_impl_t * impl);
+static rmw_guard_condition_t * create_guard_condition();
 static rmw_ret_t destroy_guard_condition(rmw_guard_condition_t * gc);
 
 struct CddsDomain;
@@ -254,6 +254,10 @@ struct rmw_context_impl_t
   dds_entity_t dds_pub;
   dds_entity_t dds_sub;
 
+  /* Participant reference count*/
+  size_t node_count{0};
+  std::mutex initialization_mutex;
+
   rmw_context_impl_t()
   : common(), domain_id(UINT32_MAX), ppant(0)
   {
@@ -263,33 +267,29 @@ struct rmw_context_impl_t
     common.pub = nullptr;
     common.sub = nullptr;
   }
+
+  // Initializes the participant, if it wasn't done already.
+  // node_count is increased
+  rmw_ret_t
+  init(rmw_init_options_t * options);
+
+  // Destroys the participant, when node_count reaches 0.
+  rmw_ret_t
+  fini();
+
   ~rmw_context_impl_t()
   {
-    discovery_thread_stop(common);
+    if (0u != this->node_count) {
-    common.graph_cache.clear_on_change_callback();
-    if (common.graph_guard_condition) {
-      destroy_guard_condition(common.graph_guard_condition);
-    }
-    if (common.pub) {
-      destroy_publisher(common.pub);
-    }
-    if (common.sub) {
-      destroy_subscription(common.sub);
-    }
-    if (ppant > 0 && dds_delete(ppant) < 0) {
       RCUTILS_SAFE_FWRITE_TO_STDERR(
-        "Failed to destroy domain in destructor\n");
+        "Not all nodes were finished before finishing the context\n."
-    }
+        "Ensure `rcl_node_fini` is called for all nodes before `rcl_context_fini`,"
-    if (domain_id != UINT32_MAX) {
+        "to avoid leaking.\n");
-      std::lock_guard<std::mutex> lock(gcdds.domains_lock);
-      CddsDomain & dom = gcdds.domains[domain_id];
-      assert(dom.refcount > 0);
-      if (--dom.refcount == 0) {
-        static_cast<void>(dds_delete(dom.domain_handle));
-        gcdds.domains.erase(domain_id);
-      }
     }
   }
+
+private:
+  void
+  clean_up();
 };
 
 struct CddsNode
@@ -583,7 +583,7 @@ static void discovery_thread(rmw_context_impl_t * impl)
   dds_entity_t ws;
   /* deleting ppant will delete waitset as well, so there is no real need to delete
      the waitset here on error, but it is more hygienic */
-  if ((ws = dds_create_waitset(impl->ppant)) < 0) {
+  if ((ws = dds_create_waitset(DDS_CYCLONEDDS_HANDLE)) < 0) {
     RCUTILS_SAFE_FWRITE_TO_STDERR(
       "ros discovery info listener thread: failed to create waitset, will shutdown ...\n");
     return;
@@ -637,7 +637,7 @@ static rmw_ret_t discovery_thread_start(rmw_context_impl_t * impl)
 {
   auto common_context = &impl->common;
   common_context->thread_is_running.store(true);
-  common_context->listener_thread_gc = create_guard_condition(impl);
+  common_context->listener_thread_gc = create_guard_condition();
   if (common_context->listener_thread_gc) {
     try {
       common_context->listener_thread = std::thread(discovery_thread, impl);
@@ -745,6 +745,21 @@ static bool check_create_domain(dds_domainid_t did, rmw_localhost_only_t localho
   }
 }
 
+static
+void
+check_destroy_domain(dds_domainid_t domain_id)
+{
+  if (domain_id != UINT32_MAX) {
+    std::lock_guard<std::mutex> lock(gcdds.domains_lock);
+    CddsDomain & dom = gcdds.domains[domain_id];
+    assert(dom.refcount > 0);
+    if (--dom.refcount == 0) {
+      static_cast<void>(dds_delete(dom.domain_handle));
+      gcdds.domains.erase(domain_id);
+    }
+  }
+}
+
 #if RMW_SUPPORT_SECURITY
 /*  Returns the full URI of a security file properly formatted for DDS  */
 bool get_security_file_URI(
@@ -816,6 +831,7 @@ void finalize_security_file_URIs(
 #endif  /* RMW_SUPPORT_SECURITY */
 
 /* Attempt to set all the qos properties needed to enable DDS security */
+static
 rmw_ret_t configure_qos_for_security(
   dds_qos_t * qos,
   const rmw_security_options_t * security_options)
@@ -861,6 +877,194 @@ rmw_ret_t configure_qos_for_security(
 #endif
 }
 
+rmw_ret_t
+rmw_context_impl_t::init(rmw_init_options_t * options)
+{
+  std::lock_guard<std::mutex> guard(initialization_mutex);
+  if (0u != this->node_count) {
+    // initialization has already been done
+    this->node_count++;
+    return RMW_RET_OK;
+  }
+
+  /* Take domains_lock and hold it until after the participant creation succeeded or
+    failed: otherwise there is a race with rmw_destroy_node deleting the last participant
+    and tearing down the domain for versions of Cyclone that implement the original
+    version of dds_create_domain that doesn't return a handle.  */
+  this->domain_id = static_cast<dds_domainid_t>(options->domain_id);
+  if (!check_create_domain(this->domain_id, options->localhost_only)) {
+    return RMW_RET_ERROR;
+  }
+
+  std::unique_ptr<dds_qos_t, std::function<void(dds_qos_t *)>>
+  ppant_qos(dds_create_qos(), &dds_delete_qos);
+  if (ppant_qos == nullptr) {
+    this->clean_up();
+    return RMW_RET_BAD_ALLOC;
+  }
+  std::string user_data = std::string("enclave=") + std::string(
+    options->enclave) + std::string(";");
+  dds_qset_userdata(ppant_qos.get(), user_data.c_str(), user_data.size());
+  if (configure_qos_for_security(
+      ppant_qos.get(),
+      &options->security_options) != RMW_RET_OK)
+  {
+    if (RMW_SECURITY_ENFORCEMENT_ENFORCE == options->security_options.enforce_security) {
+      this->clean_up();
+      return RMW_RET_ERROR;
+    }
+  }
+
+  this->ppant = dds_create_participant(this->domain_id, ppant_qos.get(), nullptr);
+  if (this->ppant < 0) {
+    this->clean_up();
+    RCUTILS_LOG_ERROR_NAMED(
+      "rmw_cyclonedds_cpp", "rmw_create_node: failed to create DDS participant");
+    return RMW_RET_ERROR;
+  }
+
+  /* Create readers for DDS built-in topics for monitoring discovery */
+  if ((this->rd_participant =
+    dds_create_reader(this->ppant, DDS_BUILTIN_TOPIC_DCPSPARTICIPANT, nullptr, nullptr)) < 0)
+  {
+    this->clean_up();
+    RCUTILS_LOG_ERROR_NAMED(
+      "rmw_cyclonedds_cpp", "rmw_create_node: failed to create DCPSParticipant reader");
+    return RMW_RET_ERROR;
+  }
+  if ((this->rd_subscription =
+    dds_create_reader(this->ppant, DDS_BUILTIN_TOPIC_DCPSSUBSCRIPTION, nullptr, nullptr)) < 0)
+  {
+    this->clean_up();
+    RCUTILS_LOG_ERROR_NAMED(
+      "rmw_cyclonedds_cpp", "rmw_create_node: failed to create DCPSSubscription reader");
+    return RMW_RET_ERROR;
+  }
+  if ((this->rd_publication =
+    dds_create_reader(this->ppant, DDS_BUILTIN_TOPIC_DCPSPUBLICATION, nullptr, nullptr)) < 0)
+  {
+    this->clean_up();
+    RCUTILS_LOG_ERROR_NAMED(
+      "rmw_cyclonedds_cpp", "rmw_create_node: failed to create DCPSPublication reader");
+    return RMW_RET_ERROR;
+  }
+  /* Create DDS publisher/subscriber objects that will be used for all DDS writers/readers
+    to be created for RMW publishers/subscriptions. */
+  if ((this->dds_pub = dds_create_publisher(this->ppant, nullptr, nullptr)) < 0) {
+    this->clean_up();
+    RCUTILS_LOG_ERROR_NAMED(
+      "rmw_cyclonedds_cpp", "rmw_create_node: failed to create DDS publisher");
+    return RMW_RET_ERROR;
+  }
+  if ((this->dds_sub = dds_create_subscriber(this->ppant, nullptr, nullptr)) < 0) {
+    this->clean_up();
+    RCUTILS_LOG_ERROR_NAMED(
+      "rmw_cyclonedds_cpp", "rmw_create_node: failed to create DDS subscriber");
+    return RMW_RET_ERROR;
+  }
+
+  rmw_qos_profile_t pubsub_qos = rmw_qos_profile_default;
+  pubsub_qos.avoid_ros_namespace_conventions = true;
+  pubsub_qos.history = RMW_QOS_POLICY_HISTORY_KEEP_LAST;
+  pubsub_qos.depth = 1;
+  pubsub_qos.durability = RMW_QOS_POLICY_DURABILITY_TRANSIENT_LOCAL;
+  pubsub_qos.reliability = RMW_QOS_POLICY_RELIABILITY_RELIABLE;
+
+  /* Create RMW publisher/subscription/guard condition used by rmw_dds_common
+    discovery */
+  rmw_publisher_options_t publisher_options = rmw_get_default_publisher_options();
+  this->common.pub = create_publisher(
+    this->ppant, this->dds_pub,
+    rosidl_typesupport_cpp::get_message_type_support_handle<ParticipantEntitiesInfo>(),
+    "ros_discovery_info",
+    &pubsub_qos,
+    &publisher_options);
+  if (this->common.pub == nullptr) {
+    this->clean_up();
+    return RMW_RET_ERROR;
+  }
+
+  rmw_subscription_options_t subscription_options = rmw_get_default_subscription_options();
+  subscription_options.ignore_local_publications = true;
+  // FIXME: keyed topics => KEEP_LAST and depth 1.
+  pubsub_qos.history = RMW_QOS_POLICY_HISTORY_KEEP_ALL;
+  this->common.sub = create_subscription(
+    this->ppant, this->dds_sub,
+    rosidl_typesupport_cpp::get_message_type_support_handle<ParticipantEntitiesInfo>(),
+    "ros_discovery_info",
+    &pubsub_qos,
+    &subscription_options);
+  if (this->common.sub == nullptr) {
+    this->clean_up();
+    return RMW_RET_ERROR;
+  }
+
+  this->common.graph_guard_condition = create_guard_condition();
+  if (this->common.graph_guard_condition == nullptr) {
+    this->clean_up();
+    return RMW_RET_BAD_ALLOC;
+  }
+
+  this->common.graph_cache.set_on_change_callback(
+    [guard_condition = this->common.graph_guard_condition]() {
+      rmw_ret_t ret = rmw_trigger_guard_condition(guard_condition);
+      if (ret != RMW_RET_OK) {
+        RMW_SET_ERROR_MSG("graph cache on_change_callback failed to trigger guard condition");
+      }
+    });
+
+  get_entity_gid(this->ppant, this->common.gid);
+  this->common.graph_cache.add_participant(this->common.gid, options->enclave);
+
+  // One could also use a set of listeners instead of a thread for maintaining the graph cache:
+  // - Locally published samples shouldn't make it to the reader, so there shouldn't be a deadlock
+  //   caused by the graph cache's mutex already having been locked by (e.g.) rmw_create_node.
+  // - Whatever the graph cache implementation does, it shouldn't involve much more than local state
+  //   updates and triggering a guard condition, and so that should be safe.
+  // however, the graph cache updates could be expensive, and so performing those operations on
+  // the thread receiving data from the network may not be wise.
+  rmw_ret_t ret;
+  if ((ret = discovery_thread_start(this)) != RMW_RET_OK) {
+    this->clean_up();
+    return ret;
+  }
+  ++this->node_count;
+  return RMW_RET_OK;
+}
+
+void
+rmw_context_impl_t::clean_up()
+{
+  discovery_thread_stop(common);
+  common.graph_cache.clear_on_change_callback();
+  if (common.graph_guard_condition) {
+    destroy_guard_condition(common.graph_guard_condition);
+  }
+  if (common.pub) {
+    destroy_publisher(common.pub);
+  }
+  if (common.sub) {
+    destroy_subscription(common.sub);
+  }
+  if (ppant > 0 && dds_delete(ppant) < 0) {
+    RCUTILS_SAFE_FWRITE_TO_STDERR(
+      "Failed to destroy domain in destructor\n");
+  }
+  check_destroy_domain(domain_id);
+}
+
+rmw_ret_t
+rmw_context_impl_t::fini()
+{
+  std::lock_guard<std::mutex> guard(initialization_mutex);
+  if (0u != --this->node_count) {
+    // destruction shouldn't happen yet
+    return RMW_RET_OK;
+  }
+  this->clean_up();
+  return RMW_RET_OK;
+}
+
 extern "C" rmw_ret_t rmw_init(const rmw_init_options_t * options, rmw_context_t * context)
 {
   rmw_ret_t ret;
@@ -881,7 +1085,6 @@ extern "C" rmw_ret_t rmw_init(const rmw_init_options_t * options, rmw_context_t
       "rmw_cyclonedds_cpp", "rmw_create_node: domain id out of range");
     return RMW_RET_INVALID_ARGUMENT;
   }
-  const dds_domainid_t domain_id = static_cast<dds_domainid_t>(options->domain_id);
 
   context->instance_id = options->instance_id;
   context->implementation_identifier = eclipse_cyclonedds_identifier;
@@ -891,144 +1094,12 @@ extern "C" rmw_ret_t rmw_init(const rmw_init_options_t * options, rmw_context_t
     return ret;
   }
 
-  std::unique_ptr<rmw_context_impl_t> impl(new(std::nothrow) rmw_context_impl_t());
+  rmw_context_impl_t * impl = new(std::nothrow) rmw_context_impl_t();
-  if (impl == nullptr) {
+  if (nullptr == impl) {
     return RMW_RET_BAD_ALLOC;
   }
 
-  /* Take domains_lock and hold it until after the participant creation succeeded or
+  context->impl = impl;
-     failed: otherwise there is a race with rmw_destroy_node deleting the last participant
-     and tearing down the domain for versions of Cyclone that implement the original
-     version of dds_create_domain that doesn't return a handle.  */
-  if (!check_create_domain(domain_id, options->localhost_only)) {
-    return RMW_RET_ERROR;
-  }
-
-  /* Once the domain id is set in impl, impl's destructor will take care of unref'ing
-     the domain */
-  impl->domain_id = domain_id;
-
-  std::unique_ptr<dds_qos_t, std::function<void(dds_qos_t *)>>
-  ppant_qos(dds_create_qos(), &dds_delete_qos);
-  if (ppant_qos == nullptr) {
-    return RMW_RET_BAD_ALLOC;
-  }
-  std::string user_data = std::string("enclave=") + std::string(
-    context->options.enclave) + std::string(";");
-  dds_qset_userdata(ppant_qos.get(), user_data.c_str(), user_data.size());
-  if (configure_qos_for_security(
-      ppant_qos.get(),
-      &context->options.security_options) != RMW_RET_OK)
-  {
-    if (context->options.security_options.enforce_security == RMW_SECURITY_ENFORCEMENT_ENFORCE) {
-      return RMW_RET_ERROR;
-    }
-  }
-  impl->ppant = dds_create_participant(domain_id, ppant_qos.get(), nullptr);
-  if (impl->ppant < 0) {
-    RCUTILS_LOG_ERROR_NAMED(
-      "rmw_cyclonedds_cpp", "rmw_create_node: failed to create DDS participant");
-    return RMW_RET_ERROR;
-  }
-
-  /* Create readers for DDS built-in topics for monitoring discovery */
-  if ((impl->rd_participant =
-    dds_create_reader(impl->ppant, DDS_BUILTIN_TOPIC_DCPSPARTICIPANT, nullptr, nullptr)) < 0)
-  {
-    RCUTILS_LOG_ERROR_NAMED(
-      "rmw_cyclonedds_cpp", "rmw_create_node: failed to create DCPSParticipant reader");
-    return RMW_RET_ERROR;
-  }
-  if ((impl->rd_subscription =
-    dds_create_reader(impl->ppant, DDS_BUILTIN_TOPIC_DCPSSUBSCRIPTION, nullptr, nullptr)) < 0)
-  {
-    RCUTILS_LOG_ERROR_NAMED(
-      "rmw_cyclonedds_cpp", "rmw_create_node: failed to create DCPSSubscription reader");
-    return RMW_RET_ERROR;
-  }
-  if ((impl->rd_publication =
-    dds_create_reader(impl->ppant, DDS_BUILTIN_TOPIC_DCPSPUBLICATION, nullptr, nullptr)) < 0)
-  {
-    RCUTILS_LOG_ERROR_NAMED(
-      "rmw_cyclonedds_cpp", "rmw_create_node: failed to create DCPSPublication reader");
-    return RMW_RET_ERROR;
-  }
-
-  /* Create DDS publisher/subscriber objects that will be used for all DDS writers/readers
-     to be created for RMW publishers/subscriptions. */
-  if ((impl->dds_pub = dds_create_publisher(impl->ppant, nullptr, nullptr)) < 0) {
-    RCUTILS_LOG_ERROR_NAMED(
-      "rmw_cyclonedds_cpp", "rmw_create_node: failed to create DDS publisher");
-    return RMW_RET_ERROR;
-  }
-  if ((impl->dds_sub = dds_create_subscriber(impl->ppant, nullptr, nullptr)) < 0) {
-    RCUTILS_LOG_ERROR_NAMED(
-      "rmw_cyclonedds_cpp", "rmw_create_node: failed to create DDS subscriber");
-    return RMW_RET_ERROR;
-  }
-
-  rmw_qos_profile_t pubsub_qos = rmw_qos_profile_default;
-  pubsub_qos.avoid_ros_namespace_conventions = true;
-  pubsub_qos.history = RMW_QOS_POLICY_HISTORY_KEEP_LAST;
-  pubsub_qos.depth = 1;
-  pubsub_qos.durability = RMW_QOS_POLICY_DURABILITY_TRANSIENT_LOCAL;
-  pubsub_qos.reliability = RMW_QOS_POLICY_RELIABILITY_RELIABLE;
-
-  /* Create RMW publisher/subscription/guard condition used by rmw_dds_common
-     discovery */
-  rmw_publisher_options_t publisher_options = rmw_get_default_publisher_options();
-  impl->common.pub = create_publisher(
-    impl->ppant, impl->dds_pub,
-    rosidl_typesupport_cpp::get_message_type_support_handle<ParticipantEntitiesInfo>(),
-    "ros_discovery_info",
-    &pubsub_qos,
-    &publisher_options);
-  if (impl->common.pub == nullptr) {
-    return RMW_RET_ERROR;
-  }
-
-  rmw_subscription_options_t subscription_options = rmw_get_default_subscription_options();
-  subscription_options.ignore_local_publications = true;
-  // FIXME: keyed topics => KEEP_LAST and depth 1.
-  pubsub_qos.history = RMW_QOS_POLICY_HISTORY_KEEP_ALL;
-  impl->common.sub = create_subscription(
-    impl->ppant, impl->dds_sub,
-    rosidl_typesupport_cpp::get_message_type_support_handle<ParticipantEntitiesInfo>(),
-    "ros_discovery_info",
-    &pubsub_qos,
-    &subscription_options);
-  if (impl->common.sub == nullptr) {
-    return RMW_RET_ERROR;
-  }
-
-  impl->common.graph_guard_condition = create_guard_condition(impl.get());
-  if (impl->common.graph_guard_condition == nullptr) {
-    return RMW_RET_BAD_ALLOC;
-  }
-
-  impl->common.graph_cache.set_on_change_callback(
-    [guard_condition = impl->common.graph_guard_condition]() {
-      rmw_ret_t ret = rmw_trigger_guard_condition(guard_condition);
-      if (ret != RMW_RET_OK) {
-        RMW_SET_ERROR_MSG("graph cache on_change_callback failed to trigger guard condition");
-      }
-    });
-
-  get_entity_gid(impl->ppant, impl->common.gid);
-  impl->common.graph_cache.add_participant(impl->common.gid, context->options.enclave);
-
-  // One could also use a set of listeners instead of a thread for maintaining the graph cache:
-  // - Locally published samples shouldn't make it to the reader, so there shouldn't be a deadlock
-  //   caused by the graph cache's mutex already having been locked by (e.g.) rmw_create_node.
-  // - Whatever the graph cache implementation does, it shouldn't involve much more than local state
-  //   updates and triggering a guard condition, and so that should be safe.
-  // however, the graph cache updates could be expensive, and so performing those operations on
-  // the thread receiving data from the network may not be wise.
-  if ((ret = discovery_thread_start(impl.get())) != RMW_RET_OK) {
-    return ret;
-  }
-
-  context->impl = impl.release();
   return RMW_RET_OK;
 }
 
@@ -1091,6 +1162,11 @@ extern "C" rmw_node_t * rmw_create_node(
     return nullptr;
   }
 
+  ret = context->impl->init(&context->options);
+  if (RMW_RET_OK != ret) {
+    return nullptr;
+  }
+
   auto * node_impl = new CddsNode();
   rmw_node_t * node_handle = nullptr;
   RET_ALLOC_X(node_impl, goto fail_node_impl);
@@ -1142,6 +1218,7 @@ fail_node_handle_name:
 fail_node_handle:
   delete node_impl;
 fail_node_impl:
+  context->impl->fini();
   return nullptr;
 }
 
@@ -1168,6 +1245,7 @@ extern "C" rmw_ret_t rmw_destroy_node(rmw_node_t * node)
 
   rmw_free(const_cast<char *>(node->name));
   rmw_free(const_cast<char *>(node->namespace_));
+  node->context->impl->fini();
   rmw_node_free(node);
   delete node_impl;
   return result_ret;
@@ -2562,11 +2640,11 @@ extern "C" rmw_ret_t rmw_take_event(
 ///////////                                                                   ///////////
 /////////////////////////////////////////////////////////////////////////////////////////
 
-static rmw_guard_condition_t * create_guard_condition(rmw_context_impl_t * impl)
+static rmw_guard_condition_t * create_guard_condition()
 {
   rmw_guard_condition_t * guard_condition_handle;
   auto * gcond_impl = new CddsGuardCondition();
-  if ((gcond_impl->gcondh = dds_create_guardcondition(impl->ppant)) < 0) {
+  if ((gcond_impl->gcondh = dds_create_guardcondition(DDS_CYCLONEDDS_HANDLE)) < 0) {
     RMW_SET_ERROR_MSG("failed to create guardcondition");
     goto fail_guardcond;
   }
@@ -2582,7 +2660,8 @@ fail_guardcond:
 
 extern "C" rmw_guard_condition_t * rmw_create_guard_condition(rmw_context_t * context)
 {
-  return create_guard_condition(context->impl);
+  (void)context;
+  return create_guard_condition();
 }
 
 static rmw_ret_t destroy_guard_condition(rmw_guard_condition_t * guard_condition_handle)
@@ -2612,6 +2691,7 @@ extern "C" rmw_ret_t rmw_trigger_guard_condition(
 
 extern "C" rmw_wait_set_t * rmw_create_wait_set(rmw_context_t * context, size_t max_conditions)
 {
+  (void)context;
   (void)max_conditions;
   rmw_wait_set_t * wait_set = rmw_wait_set_allocate();
   CddsWaitset * ws = nullptr;
@@ -2639,7 +2719,7 @@ extern "C" rmw_wait_set_t * rmw_create_wait_set(rmw_context_t * context, size_t
     std::lock_guard<std::mutex> lock(gcdds.lock);
     // Lazily create dummy guard condition
     if (gcdds.waitsets.size() == 0) {
-      if ((gcdds.gc_for_empty_waitset = dds_create_guardcondition(context->impl->ppant)) < 0) {
+      if ((gcdds.gc_for_empty_waitset = dds_create_guardcondition(DDS_CYCLONEDDS_HANDLE)) < 0) {
         RMW_SET_ERROR_MSG("failed to create guardcondition for handling empty waitsets");
         goto fail_create_dummy;
       }