| /* Copyright (C) 2005-2020 Free Software Foundation, Inc. |
| Contributed by Richard Henderson <rth@redhat.com>. |
| |
| This file is part of the GNU Offloading and Multi Processing Library |
| (libgomp). |
| |
| Libgomp is free software; you can redistribute it and/or modify it |
| under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3, or (at your option) |
| any later version. |
| |
| Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY |
| WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
| FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| more details. |
| |
| Under Section 7 of GPL version 3, you are granted additional |
| permissions described in the GCC Runtime Library Exception, version |
| 3.1, as published by the Free Software Foundation. |
| |
| You should have received a copy of the GNU General Public License and |
| a copy of the GCC Runtime Library Exception along with this program; |
| see the files COPYING3 and COPYING.RUNTIME respectively. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* This file handles the SINGLE construct. */ |
| |
| #include "libgomp.h" |
| |
| |
| /* This routine is called when first encountering a SINGLE construct that |
| doesn't have a COPYPRIVATE clause. Returns true if this is the thread |
| that should execute the clause. */ |
| |
| bool |
| GOMP_single_start (void) |
| { |
| #ifdef HAVE_SYNC_BUILTINS |
| struct gomp_thread *thr = gomp_thread (); |
| struct gomp_team *team = thr->ts.team; |
| unsigned long single_count; |
| |
| if (__builtin_expect (team == NULL, 0)) |
| return true; |
| |
| single_count = thr->ts.single_count++; |
| return __sync_bool_compare_and_swap (&team->single_count, single_count, |
| single_count + 1L); |
| #else |
| bool ret = gomp_work_share_start (0); |
| if (ret) |
| gomp_work_share_init_done (); |
| gomp_work_share_end_nowait (); |
| return ret; |
| #endif |
| } |
| |
| /* This routine is called when first encountering a SINGLE construct that |
| does have a COPYPRIVATE clause. Returns NULL if this is the thread |
| that should execute the clause; otherwise the return value is pointer |
| given to GOMP_single_copy_end by the thread that did execute the clause. */ |
| |
| void * |
| GOMP_single_copy_start (void) |
| { |
| struct gomp_thread *thr = gomp_thread (); |
| |
| bool first; |
| void *ret; |
| |
| first = gomp_work_share_start (0); |
| |
| if (first) |
| { |
| gomp_work_share_init_done (); |
| ret = NULL; |
| } |
| else |
| { |
| gomp_team_barrier_wait (&thr->ts.team->barrier); |
| |
| ret = thr->ts.work_share->copyprivate; |
| gomp_work_share_end_nowait (); |
| } |
| |
| return ret; |
| } |
| |
| /* This routine is called when the thread that entered a SINGLE construct |
| with a COPYPRIVATE clause gets to the end of the construct. */ |
| |
| void |
| GOMP_single_copy_end (void *data) |
| { |
| struct gomp_thread *thr = gomp_thread (); |
| struct gomp_team *team = thr->ts.team; |
| |
| if (team != NULL) |
| { |
| thr->ts.work_share->copyprivate = data; |
| gomp_team_barrier_wait (&team->barrier); |
| } |
| |
| gomp_work_share_end_nowait (); |
| } |