properly handle releasing memory

Makefile

@@ -1,6 +1,6 @@
 default: bfilter.c bfilter.h
-	$(CC) -g -Wall -Wextra -std=gnu99 -Wpointer-arith -Wmissing-prototypes -lfnv -lm -L. -O0 ./bfilter.c -o test -Wl,-rpath,/home/wes/bfilter;
+	$(CC) -g -Wall -Wextra -std=gnu99 -Wpointer-arith -Wmissing-prototypes -lfnv -lm -L. -O3 ./bfilter.c -o test -Wl,-rpath,/home/wes/bfilter;
 
 lib: bfilter.c bfilter.h
-	$(CC) -g -DLIB -c -fpic -Wall -Wextra -pedantic -Wpointer-arith -Werror -std=c99 -lfnv -lm -L. -O0 ./bfilter.c -Wl,-rpath,/home/wes/bfilter;
+	$(CC) -g -DLIB -c -fpic -Wall -Wextra -pedantic -Wpointer-arith -Werror -std=c99 -lfnv -lm -L. -O3 ./bfilter.c -Wl,-rpath,/home/wes/bfilter;
 	$(CC) -shared -o bfilter.so bfilter.o;

bfilter.c

@@ -186,6 +186,7 @@ bfilter_get(bit_array_t *filter,
 
 int
 release_bfilter(bit_array_t *filter) {
+  printf("Releasing bloom filter\n");
   free(filter->arr);
   free(filter);
   return 0;

bfilter.py

@@ -44,6 +44,8 @@ int bfilter_set(bit_array_t *, const char*, int);
 int  bfilter_get(bit_array_t *, const char*, int);
 
 int getbit(bit_array_t *, int);
+
+int release_bfilter(bit_array_t *);
 """)
 
 class BloomFilter:
@@ -51,7 +53,7 @@ class BloomFilter:
         self.m = m
         self.k = k
 
-        self.bitset = lib.empty_bfilter(m)
+        self.bitset = ffi.gc(lib.empty_bfilter(m), lib.release_bfilter)
 
     def add(self, key):
         lib.bfilter_set(self.bitset, key.encode("UTF-8"), self.k)