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### 2.37 `omp_unset_nest_lock` – Unset nested lock

Description:

  A nested lock about to be unset must have been locked by `omp_set_nested_lock` or `omp_test_nested_lock` before. In addition, the lock must be held by the thread calling `omp_unset_nested_lock`. If the nesting count drops to zero, the lock becomes unlocked. If one ore more threads attempted to set the lock before, one of them is chosen to, again, set the lock to itself.

C/C++:

  Prototype: | `void omp_unset_nest_lock(omp_nest_lock_t *lock);`

Fortran:

  Interface: | `subroutine omp_unset_nest_lock(nvar)`
  | `integer(omp_nest_lock_kind), intent(inout) :: nvar`

See also:

  omp_set_nest_lock

Reference:

  OpenMP specification v4.0, Section 3.3.4.