Source plates.

typedef struct {
    uint32_t       id;
    uint32_t       node_hash;
    causal_time_t  time;
    causal_type_t  type;
    char           subsystem[16];
    char           desc[CAUSAL_DESC_LEN];
    uint8_t        payload[CAUSAL_PAYLOAD_LEN];
    uint32_t       parents[CAUSAL_MAX_PARENTS];
    uint8_t        num_parents;
    uint16_t       child_count;
} causal_event_t;

static causal_event_t events[CAUSAL_MAX_EVENTS];
static uint32_t event_count;
static uint32_t next_id = 1;
static uint64_t lamport_clock;

static inline uint32_t ring_index(uint32_t id)
{
    return (id - 1) % CAUSAL_MAX_EVENTS;
}

if (num != SYS_YIELD && num != SYS_GETPID) {
    sc_event = causal_event_fmt(CAUSAL_SYSCALL, "syscall",
        "syscall %u pid=%d", num, cur ? cur->pid : 0);
    if (sc_event)
        causal_push_context(sc_event);
}

typedef struct {
    char     name[TIMELINE_NAME_LEN];
    char     app[16];
    bool     active;
    uint32_t head_id;
    uint32_t cursor_id;
    uint32_t event_count;
    uint32_t create_tick;
} timeline_t;

int actor_register(const char *name, pid_t owner) {
    if (!name || strlen(name) == 0)
        return -1;
    /* allocate an actor slot, then record it */
    causal_event_fmt(CAUSAL_ACTOR, "actor",
        "register name=%s id=%u", name, actors[i].id);
    route_add_target(name, (int)actors[i].id);
    return (int)actors[i].id;
}

#define NOTES_SNAPSHOT_PATH "/notes.snapshot"
#define NOTES_SNAPSHOT_MAGIC 0x45544F4Eu

typedef struct {
    uint32_t magic;
    uint32_t version;
    uint32_t note_state_size;
    uint32_t count;
    uint32_t saved_tick;
    uint32_t checksum;
} __attribute__((packed)) notes_snapshot_header_t;