CK_COHORT_TRYLOCK man page
CK_COHORT_TRYLOCK — try to acquire cohort lock
Concurrency Kit (libck, -lck)
CK_COHORT_TRYLOCK(COHORT_NAME cohort_name, COHORT *cohort, void *global_trylock_context, void *local_trylock_context, void *lock_unlock_context);
This call attempts to acquire both the local and global (if necessary) locks from cohort. It can only be used with cohort types that were defined using the CK_COHORT_TRYLOCK_PROTOTYPE(3) macro. The call will not block and will return a bool that will evaluate to true iff the cohort was successfully acquired. global_trylock_context will be passed as the second argument to the function that was provided as the global_trylock_method argument to CK_COHORT_TRYLOCK_PROTOTYPE if that method is called, and local_trylock_context will be passed to the function specified by local_trylock_method. If the global lock acquisition fails, then the cohort will immediately release its local lock as well, and local_unlock_context will be passed to the function specified by local_unlock_method when this call is made.
ck_cohort(3), CK_COHORT_PROTOTYPE(3), CK_COHORT_TRYLOCK_PROTOTYPE(3), CK_COHORT_INSTANCE(3), CK_COHORT_INITIALIZER(3), CK_COHORT_INIT(3), CK_COHORT_LOCK(3), CK_COHORT_UNLOCK(3), CK_COHORT_LOCKED(3),
Additional information available at http://concurrencykit.org/
ck_cohort(3), CK_COHORT_INIT(3), CK_COHORT_INSTANCE(3), CK_COHORT_LOCK(3), CK_COHORT_PROTOTYPE(3), CK_COHORT_TRYLOCK_PROTOTYPE(3), CK_COHORT_UNLOCK(3), ck_rwcohort(3).