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8.2.11 _gfortran_caf_lock — Unlocking a lock variable

Release a lock on the given image on a scalar locking variable or for the given array element for an array-valued variable. Unlocking a lock variable which is unlocked or has been locked by a different image is an error.
void _gfortran_caf_unlock (caf_token_t token, size_t index, int image_index, int *stat, char *errmsg, int errmsg_len)

token intent(in) An opaque pointer identifying the coarray.
index Array index; first array index is 0. For scalars, it is always 0.
image_index The ID of the remote image; must be a positive number.
stat intent(out) For allocatable coarrays, stores the STAT=; may be NULL
errmsg intent(out) When an error occurs, this will be set to an error message; may be NULL
errmsg_len the buffer size of errmsg.

This function is also called for critical block; for those, the array index is always zero and the image index is one. Libraries are permitted to use other images for critical-block locking variables.