diff --git a/c/zalloc_ext/Makefile b/c/zalloc_ext/Makefile
new file mode 100644
index 0000000..92c666d
--- /dev/null
+++ b/c/zalloc_ext/Makefile
@@ -0,0 +1,71 @@
+CC=cc
+CXX=c++
+INCLUDE=-I$(HOME)/projects/include
+KOLAN_PROJECTS=$(HOME)/projects
+KOLAN_INCLUDE=$(KOLAN_PROJECTS)/include
+
+# Compiler flags
+# if mode variable is empty, setting debug build mode
+ifeq ($(mode),)
+	mode = debug
+endif
+ifeq ($(mode),debug)
+	CFLAGS = -O0 -g -std=gnu99 -pedantic -Wextra -Wconversion
+	LDFLAGS =
+endif
+ifeq ($(mode),profile)
+	CFLAGS = -O0 -g -p -ftest-coverage -Wcoverage-mismatch
+	LDFLAGS = -g -p
+endif
+ifeq ($(mode),develop)
+	CFLAGS += -O2 -g
+	LDFLAGS += -O1
+endif
+ifeq ($(mode),release)
+	CFLAGS += -O2
+	LDFLAGS += -O1
+endif
+
+CFLAGS += -Wall
+#~ $(shell pkg-config --cflags liblist)
+LDFLAGS += -Wall
+#~ $(shell pkg-config --libs liblist)
+
+all: zalloc_ext_test
+
+ifneq ($(mode),debug)
+ifneq ($(mode),profile)
+ifneq ($(mode),develop)
+ifneq ($(mode),release)
+	@echo "Invalid build mode."
+	@echo "Please use 'make mode=release' or 'make mode=develop' or 'make mode=debug'"
+	@exit 1
+endif
+endif
+endif
+endif
+	@echo ".........................."
+	@echo "Building on "$(mode)" mode "
+	@echo "CFLAGS=$(CFLAGS)"
+	@echo "LDFLAGS=$(LDFLAGS)"
+	@echo ".........................."
+
+%.o :
+	$(CC) -c $(CFLAGS) $(LDFLAGS) $(INCLUDE) -o $@ $<
+
+zalloc_ext_test_obj = zalloc_ext.o zalloc.o xerror.o
+zalloc_ext_test: zalloc_ext_test.o $(zalloc_ext_test_obj)
+	$(CC) $(CFLAGS) $(LDFLAGS) $(INCLUDE) -o $@ zalloc_ext_test.o $(zalloc_ext_test_obj)
+
+zalloc_ext_test.o: zalloc_ext_test.c zalloc_ext.o zalloc.o
+
+zalloc_ext.o: $(KOLAN_INCLUDE)/zalloc_ext.c $(KOLAN_INCLUDE)/zalloc_ext.h
+
+zalloc.o: $(KOLAN_INCLUDE)/zalloc.c $(KOLAN_INCLUDE)/zalloc.h
+
+xerror.o: $(KOLAN_INCLUDE)/xerror.c $(KOLAN_INCLUDE)/xerror.c
+
+clean:
+	$(RM) *.o *.out callgrind.out.* *.gcno zalloc_ext_test
+
+.PHONY: all clean
diff --git a/c/zalloc_ext/zalloc_ext.geany b/c/zalloc_ext/zalloc_ext.geany
new file mode 100644
index 0000000..e06bb92
--- /dev/null
+++ b/c/zalloc_ext/zalloc_ext.geany
@@ -0,0 +1,47 @@
+
+[indentation]
+indent_width=8
+indent_type=1
+indent_hard_tab_width=8
+detect_indent=false
+indent_mode=2
+
+[project]
+name=zalloc_ext_test
+base_path=/home/kolan/dev/c/zalloc_ext/
+description=
+
+[long line marker]
+long_line_behaviour=1
+long_line_column=72
+
+[files]
+current_page=0
+FILE_NAME_0=0;C;0;16;1;1;1;/home/kolan/dev/c/zalloc_ext/zalloc_test.c;0
+FILE_NAME_1=1670;Make;0;16;1;1;1;/home/kolan/dev/c/zalloc_ext/Makefile;0
+FILE_NAME_2=0;C;0;16;1;1;1;/home/kolan/projects/include/zalloc_ext.c;0
+FILE_NAME_3=926;C;0;16;1;1;1;/home/kolan/projects/include/zalloc_ext.h;0
+
+[build-menu]
+NF_00_LB=_Сделать
+NF_00_CM=make
+NF_00_WD=%p
+NF_01_LB=Сделать заданную _цель
+NF_01_CM=make 
+NF_01_WD=%p
+NF_02_LB=Сделать _объект
+NF_02_CM=make %e.o
+NF_02_WD=%p
+EX_00_LB=_Выполнить
+EX_00_CM=./%e
+EX_00_WD=%p
+MakeFT_00_LB=
+MakeFT_00_CM=
+MakeFT_00_WD=%p
+MakeFT_01_LB=
+MakeFT_01_CM=
+MakeFT_01_WD=%p
+MakeFT_02_LB=
+MakeFT_02_CM=
+MakeFT_02_WD=%p
+filetypes=Make;
diff --git a/c/zalloc_ext/zalloc_ext_test.c b/c/zalloc_ext/zalloc_ext_test.c
new file mode 100644
index 0000000..07d82f9
--- /dev/null
+++ b/c/zalloc_ext/zalloc_ext_test.c
@@ -0,0 +1,47 @@
+//~ kolan@nickolay-842 ~/dev/c/zalloc(default) $ time ./zalloc_test 50000 100000
+//~ Success, iterations = 50000, nobj = 100000
+//~
+//~ real	0m0.246s
+//~ user	0m0.110s
+//~ sys	0m0.130s
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "zalloc.h"
+
+int main(int argc, char *argv[])
+{
+	if (argc != 3) {
+		fputs("Usage: realloc_speed_test_cpp iterations nobj\n", stderr);
+		exit(-1);
+	}
+
+	size_t iterations = (size_t)atoi(argv[1]);
+	size_t nobj = (size_t)atoi(argv[2]);
+
+	void **p = zmalloc(sizeof(void *) * nobj);
+	memset(p, 0, sizeof(void *) * nobj);
+
+	size_t i, idx, sz;
+	for (i = 0; i < iterations; i++) {
+		idx = (size_t)(rand() % (int)nobj);
+		sz = i;
+		p[idx] = zrealloc(p[idx], sz);
+
+		if (sz && !p[idx]) {
+			fprintf(stderr, "Alloc error at i = %lu\n", i);
+			exit(-1);
+		}
+	}
+
+	for (i = 0; i < nobj; i++) {
+		zfree(p[i]);
+		p[i] = NULL;
+	}
+
+	printf("Success, iterations = %lu, nobj = %lu\n", iterations, nobj);
+
+	return EXIT_SUCCESS;
+}