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/* Copyright (C) 2015 Free Software Foundation, Inc.
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 maintainence of threads on NVPTX. */
#include "libgomp.h"
#include <stdlib.h>
struct gomp_thread *nvptx_thrs;
static void gomp_thread_start (struct gomp_thread_pool *);
void
gomp_nvptx_main (void (*fn) (void *), void *fn_data)
{
int ntids, tid, laneid;
asm ("mov.u32 %0, %%laneid;" : "=r" (laneid));
if (laneid)
return;
asm ("mov.u32 %0, %%tid.y;" : "=r" (tid));
asm ("mov.u32 %0, %%ntid.y;" : "=r"(ntids));
if (tid == 0)
{
gomp_global_icv.nthreads_var = ntids;
/* Starting additional threads is not supported. */
gomp_global_icv.dyn_var = true;
nvptx_thrs = gomp_malloc_cleared (ntids * sizeof (*nvptx_thrs));
struct gomp_thread_pool *pool = gomp_malloc (sizeof (*pool));
pool->threads = gomp_malloc (ntids * sizeof (*pool->threads));
for (tid = 0; tid < ntids; tid++)
pool->threads[tid] = nvptx_thrs + tid;
pool->threads_size = ntids;
pool->threads_used = ntids;
pool->threads_busy = 1;
pool->last_team = NULL;
gomp_simple_barrier_init (&pool->threads_dock, ntids);
nvptx_thrs[0].thread_pool = pool;
asm ("bar.sync 0;");
fn (fn_data);
gomp_free_thread (nvptx_thrs);
free (nvptx_thrs);
}
else
{
asm ("bar.sync 0;");
gomp_thread_start (nvptx_thrs[0].thread_pool);
}
}
/* This function is a pthread_create entry point. This contains the idle
loop in which a thread waits to be called up to become part of a team. */
static void
gomp_thread_start (struct gomp_thread_pool *pool)
{
struct gomp_thread *thr = gomp_thread ();
gomp_sem_init (&thr->release, 0);
thr->thread_pool = pool;
for (;;)
{
gomp_simple_barrier_wait (&pool->threads_dock);
if (!thr->fn)
continue;
thr->fn (thr->data);
thr->fn = NULL;
struct gomp_task *task = thr->task;
gomp_team_barrier_wait_final (&thr->ts.team->barrier);
gomp_finish_task (task);
}
}
/* Launch a team. */
void
gomp_team_start (void (*fn) (void *), void *data, unsigned nthreads,
unsigned flags, struct gomp_team *team)
{
struct gomp_thread *thr, *nthr;
struct gomp_task *task;
struct gomp_task_icv *icv;
struct gomp_thread_pool *pool;
unsigned long nthreads_var;
thr = gomp_thread ();
pool = thr->thread_pool;
task = thr->task;
icv = task ? &task->icv : &gomp_global_icv;
/* Always save the previous state, even if this isn't a nested team.
In particular, we should save any work share state from an outer
orphaned work share construct. */
team->prev_ts = thr->ts;
thr->ts.team = team;
thr->ts.team_id = 0;
++thr->ts.level;
if (nthreads > 1)
++thr->ts.active_level;
thr->ts.work_share = &team->work_shares[0];
thr->ts.last_work_share = NULL;
thr->ts.single_count = 0;
thr->ts.static_trip = 0;
thr->task = &team->implicit_task[0];
nthreads_var = icv->nthreads_var;
gomp_init_task (thr->task, task, icv);
team->implicit_task[0].icv.nthreads_var = nthreads_var;
if (nthreads == 1)
return;
/* Release existing idle threads. */
for (unsigned i = 1; i < nthreads; ++i)
{
nthr = pool->threads[i];
nthr->ts.team = team;
nthr->ts.work_share = &team->work_shares[0];
nthr->ts.last_work_share = NULL;
nthr->ts.team_id = i;
nthr->ts.level = team->prev_ts.level + 1;
nthr->ts.active_level = thr->ts.active_level;
nthr->ts.single_count = 0;
nthr->ts.static_trip = 0;
nthr->task = &team->implicit_task[i];
gomp_init_task (nthr->task, task, icv);
team->implicit_task[i].icv.nthreads_var = nthreads_var;
nthr->fn = fn;
nthr->data = data;
team->ordered_release[i] = &nthr->release;
}
gomp_simple_barrier_wait (&pool->threads_dock);
}
#include "../../team.c"
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