diff --git a/c_src/eLfq/eLfq.cc b/c_src/eLfq/eLfq.cc
index c5c9017..b7e3c8c 100644
--- a/c_src/eLfq/eLfq.cc
+++ b/c_src/eLfq/eLfq.cc
@@ -1,3 +1,242 @@
 #include "erl_nif.h"
 
+#include <string.h>
+
 #include "concurrentqueue.h"
+
+struct atoms {
+    ERL_NIF_TERM atomOk;
+    ERL_NIF_TERM atomError;
+    ERL_NIF_TERM atomTrue;
+    //ERL_NIF_TERM atomFalse;
+    //ERL_NIF_TERM atomUndefined;
+    ERL_NIF_TERM atomEmpty;
+};
+
+struct shared_data {
+    ErlNifResourceType *resQueueInstance;
+};
+
+struct q_item {
+    ErlNifEnv *env;
+    ERL_NIF_TERM term;
+};
+
+struct squeue {
+    moodycamel::ConcurrentQueue<q_item> *queue;
+};
+
+const char kAtomOk[] = "ok";
+const char kAtomError[] = "error";
+const char kAtomTrue[] = "true";
+//const char kAtomFalse[] = "false";
+//const char kAtomUndefined[] = "undefined";
+const char kAtomEmpty[] = "empty";
+
+atoms ATOMS;
+
+void nif_enlfq_free(ErlNifEnv *env, void *obj);
+
+ERL_NIF_TERM nif_enlfq_new(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
+
+ERL_NIF_TERM nif_enlfq_push(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
+
+ERL_NIF_TERM nif_enlfq_pop(ErlNifEnv *env, int argc, const ERL_NIF_TERM argv[]);
+
+ERL_NIF_TERM make_atom(ErlNifEnv *env, const char *name) {
+    ERL_NIF_TERM ret;
+
+    if (enif_make_existing_atom(env, name, &ret, ERL_NIF_LATIN1))
+        return ret;
+
+    return enif_make_atom(env, name);
+}
+
+ERL_NIF_TERM make_binary(ErlNifEnv *env, const char *buff, size_t length) {
+    ERL_NIF_TERM term;
+    unsigned char *destination_buffer = enif_make_new_binary(env, length, &term);
+    memcpy(destination_buffer, buff, length);
+    return term;
+}
+
+ERL_NIF_TERM make_error(ErlNifEnv *env, const char *error) {
+    return enif_make_tuple2(env, ATOMS.atomError, make_binary(env, error, strlen(error)));
+}
+
+
+void open_resources(ErlNifEnv *env, shared_data *data) {
+    ErlNifResourceFlags flags = static_cast<ErlNifResourceFlags>(ERL_NIF_RT_CREATE | ERL_NIF_RT_TAKEOVER);
+    data->resQueueInstance = enif_open_resource_type(env, NULL, "enlfq_instance", nif_enlfq_free, flags, NULL);
+}
+
+int on_nif_load(ErlNifEnv *env, void **priv_data, ERL_NIF_TERM) {
+
+    ATOMS.atomOk = make_atom(env, kAtomOk);
+    ATOMS.atomError = make_atom(env, kAtomError);
+    ATOMS.atomTrue = make_atom(env, kAtomTrue);
+//    ATOMS.atomFalse = make_atom(env, kAtomFalse);
+//    ATOMS.atomUndefined = make_atom(env, kAtomUndefined);
+    ATOMS.atomEmpty = make_atom(env, kAtomEmpty);
+
+    shared_data *data = static_cast<shared_data *>(enif_alloc(sizeof(shared_data)));
+    open_resources(env, data);
+
+    *priv_data = data;
+    return 0;
+}
+
+void on_nif_unload(ErlNifEnv *, void *priv_data) {
+    shared_data *data = static_cast<shared_data *>(priv_data);
+    enif_free(data);
+}
+
+int on_nif_upgrade(ErlNifEnv *env, void **priv, void **, ERL_NIF_TERM) {
+    shared_data *data = static_cast<shared_data *>(enif_alloc(sizeof(shared_data)));
+    open_resources(env, data);
+
+    *priv = data;
+    return 0;
+}
+
+void nif_enlfq_free(ErlNifEnv *, void *obj) {
+    squeue *inst = static_cast<squeue *>(obj);
+
+    if (inst != nullptr) {
+        q_item item;
+        while (inst->queue->try_dequeue(item)) {
+            enif_free_env(item.env);
+        }
+        delete inst->queue;
+    }
+}
+
+ERL_NIF_TERM nif_new(ErlNifEnv *env, int, const ERL_NIF_TERM *) {
+    shared_data *data = static_cast<shared_data *>(enif_priv_data(env));
+
+
+    squeue *qinst = static_cast<squeue *>(enif_alloc_resource(data->resQueueInstance, sizeof(squeue)));
+    qinst->queue = new moodycamel::ConcurrentQueue<q_item>;
+
+    if (qinst == NULL)
+        return make_error(env, "enif_alloc_resource failed");
+
+    ERL_NIF_TERM term = enif_make_resource(env, qinst);
+    enif_release_resource(qinst);
+    return enif_make_tuple2(env, ATOMS.atomOk, term);
+}
+
+ERL_NIF_TERM nif_in2(ErlNifEnv *env, int, const ERL_NIF_TERM argv[]) {
+    shared_data *data = static_cast<shared_data *>(enif_priv_data(env));
+
+    squeue *inst;
+
+    if (!enif_get_resource(env, argv[0], data->resQueueInstance, (void **) &inst)) {
+        return enif_make_badarg(env);
+    }
+
+    q_item item;
+
+    item.env = enif_alloc_env();
+    item.term = enif_make_copy(item.env, argv[1]);
+
+    inst->queue->enqueue(item);
+
+    return ATOMS.atomTrue;
+}
+
+ERL_NIF_TERM nif_in3(ErlNifEnv *env, int, const ERL_NIF_TERM argv[]) {
+    return ATOMS.atomTrue;
+}
+
+ERL_NIF_TERM nif_ins2(ErlNifEnv *env, int, const ERL_NIF_TERM argv[]) {
+    return ATOMS.atomTrue;
+}
+
+ERL_NIF_TERM nif_ins3(ErlNifEnv *env, int, const ERL_NIF_TERM argv[]) {
+    return ATOMS.atomTrue;
+}
+
+ERL_NIF_TERM nif_tryIn2(ErlNifEnv *env, int, const ERL_NIF_TERM argv[]) {
+    return ATOMS.atomTrue;
+}
+
+ERL_NIF_TERM nif_tryIn3(ErlNifEnv *env, int, const ERL_NIF_TERM argv[]) {
+    return ATOMS.atomTrue;
+}
+
+ERL_NIF_TERM nif_tryIns2(ErlNifEnv *env, int, const ERL_NIF_TERM argv[]) {
+    return ATOMS.atomTrue;
+}
+
+ERL_NIF_TERM nif_tryIns3(ErlNifEnv *env, int, const ERL_NIF_TERM argv[]) {
+    return ATOMS.atomTrue;
+}
+
+ERL_NIF_TERM nif_tryOut1(ErlNifEnv *env, int, const ERL_NIF_TERM argv[]) {
+    shared_data *data = static_cast<shared_data *>(enif_priv_data(env));
+    squeue *inst = NULL;
+
+    if (!enif_get_resource(env, argv[0], data->resQueueInstance, (void **) &inst)) {
+        return enif_make_badarg(env);
+    }
+
+    ERL_NIF_TERM term;
+    q_item item;
+
+    if (inst->queue->try_dequeue(item)) {
+        term = enif_make_copy(env, item.term);
+        enif_free_env(item.env);
+        return enif_make_tuple2(env, ATOMS.atomOk, term);
+    } else {
+        return ATOMS.atomEmpty;
+    }
+
+}
+
+ERL_NIF_TERM nif_tryOut2(ErlNifEnv *env, int, const ERL_NIF_TERM argv[]) {
+    return ATOMS.atomEmpty;
+}
+
+ERL_NIF_TERM nif_tryOuts2(ErlNifEnv *env, int, const ERL_NIF_TERM argv[]) {
+    return ATOMS.atomEmpty;
+}
+
+ERL_NIF_TERM nif_tryOuts3(ErlNifEnv *env, int, const ERL_NIF_TERM argv[]) {
+    return ATOMS.atomEmpty;
+}
+
+ERL_NIF_TERM nif_tryOutByProd2(ErlNifEnv *env, int, const ERL_NIF_TERM argv[]) {
+    return ATOMS.atomEmpty;
+}
+
+ERL_NIF_TERM nif_tryOutsByProd3(ErlNifEnv *env, int, const ERL_NIF_TERM argv[]) {
+    return ATOMS.atomEmpty;
+}
+
+ERL_NIF_TERM nif_size1(ErlNifEnv *env, int, const ERL_NIF_TERM argv[]) {
+    return ATOMS.atomEmpty;
+}
+
+
+static ErlNifFunc nif_funcs[] =
+        {
+                {"new",           0, nif_new},
+                {"in",            2, nif_in2},
+                {"in",            3, nif_in3},
+                {"ins",           2, nif_ins2},
+                {"ins",           3, nif_ins3},
+                {"tryIn",         2, nif_tryIn2},
+                {"tryIn",         3, nif_tryIn3},
+                {"tryIns",        2, nif_tryIns2},
+                {"tryIns",        3, nif_tryIns3},
+                {"tryOut",        1, nif_tryOut1},
+                {"tryOut",        2, nif_tryOut2},
+                {"tryOuts",       2, nif_tryOuts2},
+                {"tryOuts",       3, nif_tryOuts3},
+                {"tryOutByProd",  2, nif_tryOutByProd2},
+                {"tryOutsByProd", 3, nif_tryOutsByProd3},
+                {"size",          1, nif_size1}
+        };
+
+ERL_NIF_INIT(eLfq, nif_funcs, on_nif_load, NULL, on_nif_upgrade, on_nif_unload
+)
\ No newline at end of file