Here are the data structures with brief descriptions:

C_influx_client_t
C_influx_v2_client_t
C_lf_sensor_message_t
C_lf_tag_advancement_barrier
Callocation_record_t
Cbuild_config_t
Ccustom_scheduler_data_t
Cdeque_node_t
Cdeque_t
Cenvironment_t	Execution environment. This struct contains information about the execution environment. An execution environment maintains a notion of a "current tag" and has its own event queue and scheduler. Normally, there is only one execution environment, but if you use scheduling enclaves, then there will be one for each enclave
Cevent_t
Cfederate_instance_t
Cfederation_metadata_t
Cgeneric_action_capsule_struct
Cgeneric_action_instance_struct
Cgeneric_port_capsule_struct
Cgeneric_port_instance_struct
Chashset_itr_st
Chashset_st
Clf_action_base_t
Clf_action_internal_t
Clf_cond_t
Clf_multiport_iterator_t
Clf_port_base_t	Base type for ports. Port structs are customized types because their payloads are type specific. This struct represents their common features. Given any pointer to a port struct, it can be cast to lf_port_base_t and then these common fields can be accessed. IMPORTANT: If this is changed, it must also be changed in CPortGenerator.java generateAuxiliaryStruct()
Clf_port_internal_t	Internal part of the port structs. HAS TO MATCH lf_port_base_t after tmplt and is_present
Clf_scheduler_t	Paramters used in schedulers of the threaded reactor C runtime
Clf_scheduling_policy_t
Clf_semaphore_t
Clf_sparse_io_record_t
Clf_stat_ll
Clf_token_t
Clf_wav_data_t
Clf_wav_format_t
Clf_wav_riff_t
Clf_wav_t
Clf_waveform_t
Cmixed_radix_int_t
Cnote
Cobject_description_t
Copen_file_t
Cpqueue_t
Cpqueue_tag_element_t	The type for an element in a priority queue that is sorted by tag
Cpy_tag_t
Creaction_stats_t
Creaction_t
Csched_params_t	Struct representing the most common scheduler parameters
Cself_base_t	The base type for all reactor self structs
Csocket_stat_t
Csummary_stats_t
Ctag_t
Ctimespec
Ctoken_template_t	Base type for ports (lf_port_base_t) and actions (trigger_t), which can carry tokens. The structs lf_port_base_t and trigger_t should start with an instance of this struct so that they can be cast to this struct to access these fields in a uniform way
Ctoken_type_t	Type information for tokens. Specifically, this struct contains the fields needed to support token types, which carry dynamically allocated data
Ctrace_record_nodeps_t
Ctrace_t	This struct holds all the state associated with tracing in a single environment. Each environment which has tracing enabled will have such a struct on its environment struct
Ctrigger_t
Cvector_t
Cversion_t
Cwatchdog_t