[Bug libgomp/92881] [OpenACC] In async context, need to use 'gomp_remove_var_async' instead of 'gomp_remove_var'

[jules at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92881

--- Comment #1 from jules at gcc dot gnu.org ---
Author: jules
Date: Fri Dec 13 23:14:15 2019
New Revision: 279388

URL: https://gcc.gnu.org/viewcvs?rev=279388&root=gcc&view=rev
Log:
Fix potential race condition in OpenACC "exit data" operations

        PR libgomp/92881

        libgomp/
        * libgomp.h (gomp_remove_var_async): Add prototype.
        * oacc-mem.c (delete_copyout): Call gomp_remove_var_async instead of
        gomp_remove_var.
        * target.c (gomp_unref_tgt): Change return type to bool, indicating
        whether target_mem_desc was unmapped.
        (gomp_unref_tgt_void): New.
        (gomp_remove_var): Reimplement in terms of...
        (gomp_remove_var_internal): ...this new helper function.
        (gomp_remove_var_async): New, implemented using above helper function.
        (gomp_unmap_vars_internal): Use gomp_unref_tgt_void instead of
        gomp_unref_tgt.

Reviewed-by: Thomas Schwinge <thomas@codesourcery.com>

Modified:
    trunk/libgomp/ChangeLog
    trunk/libgomp/libgomp.h
    trunk/libgomp/oacc-mem.c
    trunk/libgomp/target.c