Scroll to navigation

CK_RHS_PUT_UNIQUE(3) Library Functions Manual CK_RHS_PUT_UNIQUE(3)


ck_rhs_put_uniqueunconditionally store unique key into a hash set


Concurrency Kit (libck, -lck)


#include <ck_rhs.h>

ck_rhs_put_unique(ck_rhs_t *hs, unsigned long hash, const void *key);


The (3) function will store the key specified by the key argument in the hash set pointed to by the hs argument. The key specified by key is expected to have the hash value specified by the hash argument (which was previously generated using the CK_RHS_HASH(3) macro).

If the call to (3) was successful then the key specified by key was successfully stored in the hash set pointed to by hs. The function will cause undefined behavior if a key with an equivalent value is already present in the hash set. For replacement semantics, please see the ck_rhs_set(3) function.


Upon successful completion, ck_rhs_put_unique(3) returns true and otherwise returns false on failure.


Behavior is undefined if key or hs are uninitialized. The function will also return false if the hash set could not be enlarged to accomodate key insertion. The function will result in undefined behavior if called for an already inserted key value.


ck_rhs_init(3), ck_rhs_move(3), ck_rhs_destroy(3), CK_RHS_HASH(3), ck_rhs_iterator_init(3), ck_rhs_next(3), ck_rhs_get(3), ck_rhs_put(3), ck_rhs_set(3), ck_rhs_fas(3), ck_rhs_remove(3), ck_rhs_grow(3), ck_rhs_rebuild(3), ck_rhs_gc(3), ck_rhs_count(3), ck_rhs_reset(3), ck_rhs_reset_size(3), ck_rhs_stat(3)

Additional information available at

December 7, 2013