diff --git a/core/snmp.c b/core/snmp.c
index 5f1aa905..fd3d861f 100644
--- a/core/snmp.c
+++ b/core/snmp.c
@@ -249,11 +249,14 @@ static uint64_t get_uwsgi_snmp_value(uint64_t val, uint8_t * oid_t) {
 static uint64_t get_uwsgi_custom_snmp_value(uint64_t val, uint8_t * oid_t) {
 
 	val--;
+        uwsgi_wlock(uwsgi.snmp_lock);
 	if (uwsgi.shared->snmp_value[val].type) {
 		*oid_t = uwsgi.shared->snmp_value[val].type;
+		uwsgi_rwunlock(uwsgi.snmp_lock);
 		return uwsgi.shared->snmp_value[val].val;
 	}
 
+	uwsgi_rwunlock(uwsgi.snmp_lock);
 	*oid_t = SNMP_NULL;
 	return 0;
 }
diff --git a/core/uwsgi.c b/core/uwsgi.c
index df778296..0d3fe442 100644
--- a/core/uwsgi.c
+++ b/core/uwsgi.c
@@ -2172,6 +2172,10 @@ int uwsgi_start(void *v_argv) {
 		uwsgi.sa_lock = uwsgi_rwlock_init("sharedarea");
 	}
 
+#ifdef UWSGI_SNMP
+	uwsgi.snmp_lock = uwsgi_lock_init("snmp");
+#endif
+
 	// setup queue
 	if (uwsgi.queue_size > 0) {
 		uwsgi_init_queue();
diff --git a/plugins/python/uwsgi_pymodule.c b/plugins/python/uwsgi_pymodule.c
index 644aba1a..bd48bca0 100644
--- a/plugins/python/uwsgi_pymodule.c
+++ b/plugins/python/uwsgi_pymodule.c
@@ -3924,7 +3924,7 @@ void init_uwsgi_module_sharedarea(PyObject * current_uwsgi_module) {
 }
 
 #ifdef UWSGI_SNMP
-PyObject *py_snmp_counter32(PyObject * self, PyObject * args) {
+PyObject *py_snmp_set_counter32(PyObject * self, PyObject * args) {
 
                    uint8_t oid_num;
                    uint32_t oid_val = 0;
@@ -3936,9 +3936,15 @@ PyObject *py_snmp_counter32(PyObject * self, PyObject * args) {
                    if (oid_num > 100 || oid_num < 1)
                    goto clear;
 
+                   UWSGI_RELEASE_GIL
+                   uwsgi_wlock(uwsgi.snmp_lock);
+
                    uwsgi.shared->snmp_value[oid_num - 1].type = SNMP_COUNTER32;
                    uwsgi.shared->snmp_value[oid_num - 1].val = oid_val;
 
+                   uwsgi_rwunlock(uwsgi.snmp_lock);
+                   UWSGI_GET_GIL
+
                    Py_INCREF(Py_True);
                    return Py_True;
 
@@ -3948,7 +3954,7 @@ clear:
 		return Py_None;
 }
 
-PyObject *py_snmp_counter64(PyObject * self, PyObject * args) {
+PyObject *py_snmp_set_counter64(PyObject * self, PyObject * args) {
 
 	uint8_t oid_num;
 	uint64_t oid_val = 0;
@@ -3960,9 +3966,15 @@ PyObject *py_snmp_counter64(PyObject * self, PyObject * args) {
 	if (oid_num > 100 || oid_num < 1)
 	goto clear;
 
+	UWSGI_RELEASE_GIL
+	uwsgi_wlock(uwsgi.snmp_lock);
+
 	uwsgi.shared->snmp_value[oid_num - 1].type = SNMP_COUNTER64;
 	uwsgi.shared->snmp_value[oid_num - 1].val = oid_val;
 
+	uwsgi_rwunlock(uwsgi.snmp_lock);
+	UWSGI_GET_GIL
+
 	Py_INCREF(Py_True);
 	return Py_True;
 
@@ -3972,7 +3984,7 @@ clear:
 	return Py_None;
 }
 
-PyObject *py_snmp_gauge(PyObject * self, PyObject * args) {
+PyObject *py_snmp_set_gauge(PyObject * self, PyObject * args) {
 
 	uint8_t oid_num;
 	uint32_t oid_val = 0;
@@ -3984,9 +3996,15 @@ PyObject *py_snmp_gauge(PyObject * self, PyObject * args) {
 	if (oid_num > 100 || oid_num < 1)
 		goto clear;
 
+	UWSGI_RELEASE_GIL
+	uwsgi_wlock(uwsgi.snmp_lock);
+
 	uwsgi.shared->snmp_value[oid_num - 1].type = SNMP_GAUGE;
 	uwsgi.shared->snmp_value[oid_num - 1].val = oid_val;
 
+	uwsgi_rwunlock(uwsgi.snmp_lock);
+	UWSGI_GET_GIL
+
 	Py_INCREF(Py_True);
 	return Py_True;
 
@@ -3996,7 +4014,205 @@ clear:
 	return Py_None;
 }
 
-PyObject *py_snmp_community(PyObject * self, PyObject * args) {
+PyObject *py_snmp_incr_counter32(PyObject * self, PyObject * args) {
+
+	uint8_t oid_num;
+	uint32_t oid_val = 1;
+
+	if (!PyArg_ParseTuple(args, "bI:snmp_incr_counter32", &oid_num, &oid_val)) {
+		PyErr_Clear();
+		if (!PyArg_ParseTuple(args, "b:snmp_incr_counter32", &oid_num)) {
+			return NULL;
+		}
+	}
+
+	if (oid_num > 100 || oid_num < 1)
+		goto clear;
+
+	UWSGI_RELEASE_GIL
+	uwsgi_wlock(uwsgi.snmp_lock);
+
+	uwsgi.shared->snmp_value[oid_num - 1].type = SNMP_COUNTER32;
+	uwsgi.shared->snmp_value[oid_num - 1].val = uwsgi.shared->snmp_value[oid_num - 1].val + oid_val;
+
+	uwsgi_rwunlock(uwsgi.snmp_lock);
+	UWSGI_GET_GIL
+
+	Py_INCREF(Py_True);
+	return Py_True;
+
+clear:
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+PyObject *py_snmp_incr_counter64(PyObject * self, PyObject * args) {
+
+	uint8_t oid_num;
+	uint64_t oid_val = 1;
+
+	if (!PyArg_ParseTuple(args, "bI:snmp_incr_counter64", &oid_num, &oid_val)) {
+		PyErr_Clear();
+		if (!PyArg_ParseTuple(args, "b:snmp_incr_counter64", &oid_num)) {
+			return NULL;
+		}
+	}
+
+	if (oid_num > 100 || oid_num < 1)
+		goto clear;
+
+	UWSGI_RELEASE_GIL
+	uwsgi_wlock(uwsgi.snmp_lock);
+
+	uwsgi.shared->snmp_value[oid_num - 1].type = SNMP_COUNTER64;
+	uwsgi.shared->snmp_value[oid_num - 1].val = uwsgi.shared->snmp_value[oid_num - 1].val + oid_val;
+
+	uwsgi_rwunlock(uwsgi.snmp_lock);
+	UWSGI_GET_GIL
+
+	Py_INCREF(Py_True);
+	return Py_True;
+
+clear:
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+PyObject *py_snmp_incr_gauge(PyObject * self, PyObject * args) {
+
+	uint8_t oid_num;
+	uint64_t oid_val = 1;
+
+	if (!PyArg_ParseTuple(args, "bI:snmp_incr_gauge", &oid_num, &oid_val)) {
+		PyErr_Clear();
+		if (!PyArg_ParseTuple(args, "b:snmp_incr_gauge", &oid_num)) {
+			return NULL;
+		}
+	}
+
+	if (oid_num > 100 || oid_num < 1)
+		goto clear;
+
+	UWSGI_RELEASE_GIL
+	uwsgi_wlock(uwsgi.snmp_lock);
+
+	uwsgi.shared->snmp_value[oid_num - 1].type = SNMP_GAUGE;
+	uwsgi.shared->snmp_value[oid_num - 1].val = uwsgi.shared->snmp_value[oid_num - 1].val + oid_val;
+
+	uwsgi_rwunlock(uwsgi.snmp_lock);
+	UWSGI_GET_GIL
+
+	Py_INCREF(Py_True);
+	return Py_True;
+
+clear:
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+PyObject *py_snmp_decr_counter32(PyObject * self, PyObject * args) {
+
+	uint8_t oid_num;
+	uint32_t oid_val = 1;
+
+	if (!PyArg_ParseTuple(args, "bI:snmp_incr_counter32", &oid_num, &oid_val)) {
+		PyErr_Clear();
+		if (!PyArg_ParseTuple(args, "b:snmp_incr_counter32", &oid_num)) {
+			return NULL;
+		}
+	}
+
+	if (oid_num > 100 || oid_num < 1)
+		goto clear;
+
+	UWSGI_RELEASE_GIL
+	uwsgi_wlock(uwsgi.snmp_lock);
+
+	uwsgi.shared->snmp_value[oid_num - 1].type = SNMP_COUNTER32;
+	uwsgi.shared->snmp_value[oid_num - 1].val = uwsgi.shared->snmp_value[oid_num - 1].val - oid_val;
+
+	uwsgi_rwunlock(uwsgi.snmp_lock);
+	UWSGI_GET_GIL
+
+	Py_INCREF(Py_True);
+	return Py_True;
+
+clear:
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+PyObject *py_snmp_decr_counter64(PyObject * self, PyObject * args) {
+
+	uint8_t oid_num;
+	uint64_t oid_val = 1;
+
+	if (!PyArg_ParseTuple(args, "bI:snmp_incr_counter64", &oid_num, &oid_val)) {
+		PyErr_Clear();
+		if (!PyArg_ParseTuple(args, "b:snmp_incr_counter64", &oid_num)) {
+			return NULL;
+		}
+	}
+
+	if (oid_num > 100 || oid_num < 1)
+		goto clear;
+
+	UWSGI_RELEASE_GIL
+	uwsgi_wlock(uwsgi.snmp_lock);
+
+	uwsgi.shared->snmp_value[oid_num - 1].type = SNMP_COUNTER64;
+	uwsgi.shared->snmp_value[oid_num - 1].val = uwsgi.shared->snmp_value[oid_num - 1].val - oid_val;
+
+	uwsgi_rwunlock(uwsgi.snmp_lock);
+	UWSGI_GET_GIL
+
+	Py_INCREF(Py_True);
+	return Py_True;
+
+clear:
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+PyObject *py_snmp_decr_gauge(PyObject * self, PyObject * args) {
+
+	uint8_t oid_num;
+	uint64_t oid_val = 1;
+
+	if (!PyArg_ParseTuple(args, "bI:snmp_incr_gauge", &oid_num, &oid_val)) {
+		PyErr_Clear();
+		if (!PyArg_ParseTuple(args, "b:snmp_incr_gauge", &oid_num)) {
+			return NULL;
+		}
+	}
+
+	if (oid_num > 100 || oid_num < 1)
+		goto clear;
+       
+	UWSGI_RELEASE_GIL
+	uwsgi_wlock(uwsgi.snmp_lock);
+
+	uwsgi.shared->snmp_value[oid_num - 1].type = SNMP_GAUGE;
+	uwsgi.shared->snmp_value[oid_num - 1].val = uwsgi.shared->snmp_value[oid_num - 1].val - oid_val;
+
+	uwsgi_rwunlock(uwsgi.snmp_lock);
+	UWSGI_GET_GIL
+
+	Py_INCREF(Py_True);
+	return Py_True;
+
+clear:
+
+	Py_INCREF(Py_None);
+	return Py_None;
+}
+
+PyObject *py_snmp_set_community(PyObject * self, PyObject * args) {
 
         char *snmp_community;
 
@@ -4019,10 +4235,16 @@ PyObject *py_snmp_community(PyObject * self, PyObject * args) {
 
 
 static PyMethodDef uwsgi_snmp_methods[] = {
-        {"snmp_set_counter32", py_snmp_counter32, METH_VARARGS, ""},
-        {"snmp_set_counter64", py_snmp_counter64, METH_VARARGS, ""},
-        {"snmp_set_gauge", py_snmp_gauge, METH_VARARGS, ""},
-        {"snmp_set_community", py_snmp_community, METH_VARARGS, ""},
+        {"snmp_set_counter32", py_snmp_set_counter32, METH_VARARGS, ""},
+        {"snmp_set_counter64", py_snmp_set_counter64, METH_VARARGS, ""},
+        {"snmp_set_gauge", py_snmp_set_gauge, METH_VARARGS, ""},
+        {"snmp_incr_counter32", py_snmp_incr_counter32, METH_VARARGS, ""},
+        {"snmp_incr_counter64", py_snmp_incr_counter64, METH_VARARGS, ""},
+        {"snmp_incr_gauge", py_snmp_incr_gauge, METH_VARARGS, ""},
+        {"snmp_decr_counter32", py_snmp_decr_counter32, METH_VARARGS, ""},
+        {"snmp_decr_counter64", py_snmp_decr_counter64, METH_VARARGS, ""},
+        {"snmp_decr_gauge", py_snmp_decr_gauge, METH_VARARGS, ""},
+        {"snmp_set_community", py_snmp_set_community, METH_VARARGS, ""},
         {NULL, NULL},
 };
 
diff --git a/staticfilesnmp.py b/staticfilesnmp.py
index 06dc6bf4..315e85c9 100644
--- a/staticfilesnmp.py
+++ b/staticfilesnmp.py
@@ -1,13 +1,13 @@
 import uwsgi
+from os import path
 
-counter = 0
-uwsgi.snmp_set_counter64(1, counter)
+uwsgi.snmp_set_counter64(1, 0)  # Number of requests
+uwsgi.snmp_set_counter64(2, 0)  # Number of bytes
 
 def application(environ, start_response):
-    global counter
-
-    start_response('200 OK', [('Content-Type', 'image/png')])
+    size = path.getsize('logo_uWSGI.png')
+    start_response('200 OK', [('Content-Type', 'image/png'), ('Content-Length', str(size))] )
     fd = open('logo_uWSGI.png','r')
-    counter = counter+1
-    uwsgi.snmp_set_counter64(1, counter)
+    uwsgi.snmp_incr_counter64(1)
+    uwsgi.snmp_incr_counter64(2, size)
     return environ['wsgi.file_wrapper'](fd, 4096)
diff --git a/uwsgi.h b/uwsgi.h
index c75168da..b240c449 100644
--- a/uwsgi.h
+++ b/uwsgi.h
@@ -1600,6 +1600,7 @@ struct uwsgi_server {
 	int snmp;
 	char *snmp_addr;
 	char *snmp_community;
+	struct uwsgi_lock_item *snmp_lock;
 #endif