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When thinking about GOMP_teams3, I've realized that using global variables for the values returned by omp_get_num_teams()/omp_get_team_num() calls is incorrect even with our right now dumb way of implementing host teams. The problems are two, one is if host teams is used from multiple pthread_create created threads - the spec says that host teams can't be nested inside of explicit parallel or other teams constructs, but with pthread_create the standard says obviously nothing about it. Another more important thing is host fallback, right now we don't do anything for omp_get_num_teams() or omp_get_team_num() which was fine before host teams was introduced and the 5.1 requirement that num_teams clause specifies minimum of teams, but with the global vars it means inside of target teams num_teams (2) we happily return omp_get_num_teams() == 4 if the target teams is inside of host teams with num_teams(4). With target fallback being invoked from parallel regions global vars simply can't work right on the host. So, this patch moves them to struct gomp_thread and propagates those for parallel to child threads. For host fallback, the implicit zeroing of *thr results in us returning omp_get_num_teams () == 1 and omp_get_team_num () == 0 which is fine for target teams without num_teams clause, for target teams with num_teams clause something to work on and for target without teams nested in it I've asked on omp-lang what should be done. 2021-11-11 Jakub Jelinek <jakub@redhat.com> * libgomp.h (struct gomp_thread): Add num_teams and team_num members. * team.c (struct gomp_thread_start_data): Likewise. (gomp_thread_start): Initialize thr->num_teams and thr->team_num. (gomp_team_start): Initialize start_data->num_teams and start_data->team_num. Update nthr->num_teams and nthr->team_num. * teams.c (gomp_num_teams, gomp_team_num): Remove. (GOMP_teams_reg): Set and restore thr->num_teams and thr->team_num instead of gomp_num_teams and gomp_team_num. (omp_get_num_teams): Use thr->num_teams + 1 instead of gomp_num_teams. (omp_get_team_num): Use thr->team_num instead of gomp_team_num. * testsuite/libgomp.c/teams-4.c: New test.
77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/* Copyright (C) 2018-2021 Free Software Foundation, Inc.
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Contributed by Jakub Jelinek <jakub@redhat.com>.
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This file is part of the GNU Offloading and Multi Processing Library
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(libgomp).
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Libgomp is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* This file handles the host TEAMS construct. */
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#include "libgomp.h"
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#include <limits.h>
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void
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GOMP_teams_reg (void (*fn) (void *), void *data, unsigned int num_teams,
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unsigned int thread_limit, unsigned int flags)
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{
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struct gomp_thread *thr = gomp_thread ();
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(void) flags;
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unsigned old_thread_limit_var = 0;
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if (thread_limit == 0)
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thread_limit = gomp_teams_thread_limit_var;
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if (thread_limit)
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{
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struct gomp_task_icv *icv = gomp_icv (true);
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old_thread_limit_var = icv->thread_limit_var;
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icv->thread_limit_var
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= thread_limit > INT_MAX ? UINT_MAX : thread_limit;
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}
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if (num_teams == 0)
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num_teams = gomp_nteams_var ? gomp_nteams_var : 3;
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thr->num_teams = num_teams - 1;
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for (thr->team_num = 0; thr->team_num < num_teams; thr->team_num++)
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fn (data);
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thr->num_teams = 0;
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thr->team_num = 0;
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if (thread_limit)
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{
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struct gomp_task_icv *icv = gomp_icv (true);
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icv->thread_limit_var = old_thread_limit_var;
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}
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}
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int
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omp_get_num_teams (void)
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{
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struct gomp_thread *thr = gomp_thread ();
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return thr->num_teams + 1;
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}
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int
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omp_get_team_num (void)
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{
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struct gomp_thread *thr = gomp_thread ();
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return thr->team_num;
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}
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ialias (omp_get_num_teams)
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ialias (omp_get_team_num)
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