diff --git a/include/types/shctx.h b/include/types/shctx.h
new file mode 100644
index 0000000..9c384d9
--- /dev/null
+++ b/include/types/shctx.h
@@ -0,0 +1,51 @@
+#ifndef __TYPES_SHCTX
+#define __TYPES_SHCTX
+
+#include <openssl/ssl.h> /* shared session depend of openssl */
+
+#ifndef SHSESS_BLOCK_MIN_SIZE
+#define SHSESS_BLOCK_MIN_SIZE 128
+#endif
+
+#ifndef SHSESS_MAX_DATA_LEN
+#define SHSESS_MAX_DATA_LEN 4096
+#endif
+
+#ifndef SHCTX_APPNAME
+#define SHCTX_APPNAME "haproxy"
+#endif
+
+#define SHCTX_E_ALLOC_CACHE -1
+#define SHCTX_E_INIT_LOCK   -2
+
+struct shared_session {
+	struct ebmb_node key;
+	unsigned char key_data[SSL_MAX_SSL_SESSION_ID_LENGTH];
+	unsigned char data[SHSESS_BLOCK_MIN_SIZE];
+};
+
+struct shared_block {
+	union {
+		struct shared_session session;
+		unsigned char data[sizeof(struct shared_session)];
+	} data;
+	short int data_len;
+	struct shared_block *p;
+	struct shared_block *n;
+};
+
+struct shared_context {
+#ifndef USE_PRIVATE_CACHE
+#ifdef USE_PTHREAD_PSHARED
+	pthread_mutex_t mutex;
+#else
+	unsigned int waiters;
+#endif
+#endif
+	struct shared_block active;
+	struct shared_block free;
+};
+
+extern struct shared_context *shctx;
+
+#endif