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Diffstat (limited to 'gcc-4.2.1-5666.3/libgomp/team.c')
| -rw-r--r-- | gcc-4.2.1-5666.3/libgomp/team.c | 341 |
1 files changed, 0 insertions, 341 deletions
diff --git a/gcc-4.2.1-5666.3/libgomp/team.c b/gcc-4.2.1-5666.3/libgomp/team.c deleted file mode 100644 index 060f4ea2c..000000000 --- a/gcc-4.2.1-5666.3/libgomp/team.c +++ /dev/null @@ -1,341 +0,0 @@ -/* Copyright (C) 2005 Free Software Foundation, Inc. - Contributed by Richard Henderson <rth@redhat.com>. - - This file is part of the GNU OpenMP Library (libgomp). - - Libgomp is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, 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 Lesser General Public License for - more details. - - You should have received a copy of the GNU Lesser General Public License - along with libgomp; see the file COPYING.LIB. If not, write to the - Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, - MA 02110-1301, USA. */ - -/* As a special exception, if you link this library with other files, some - of which are compiled with GCC, to produce an executable, this library - does not by itself cause the resulting executable to be covered by the - GNU General Public License. This exception does not however invalidate - any other reasons why the executable file might be covered by the GNU - General Public License. */ - -/* This file handles the maintainence of threads in response to team - creation and termination. */ - -#include "libgomp.h" -#include <stdlib.h> -#include <string.h> - -/* This array manages threads spawned from the top level, which will - return to the idle loop once the current PARALLEL construct ends. */ -static struct gomp_thread **gomp_threads; -static unsigned gomp_threads_size; -static unsigned gomp_threads_used; - -/* This attribute contains PTHREAD_CREATE_DETACHED. */ -pthread_attr_t gomp_thread_attr; - -/* This barrier holds and releases threads waiting in gomp_threads. */ -static gomp_barrier_t gomp_threads_dock; - -/* This is the libgomp per-thread data structure. */ -#ifdef HAVE_TLS -__thread struct gomp_thread gomp_tls_data; -#else -pthread_key_t gomp_tls_key; -#endif - - -/* This structure is used to communicate across pthread_create. */ - -struct gomp_thread_start_data -{ - struct gomp_team_state ts; - void (*fn) (void *); - void *fn_data; - bool nested; -}; - - -/* 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 (void *xdata) -{ - struct gomp_thread_start_data *data = xdata; - struct gomp_thread *thr; - void (*local_fn) (void *); - void *local_data; - -#ifdef HAVE_TLS - thr = &gomp_tls_data; -#else - struct gomp_thread local_thr; - thr = &local_thr; - pthread_setspecific (gomp_tls_key, thr); -#endif - gomp_sem_init (&thr->release, 0); - - /* Extract what we need from data. */ - local_fn = data->fn; - local_data = data->fn_data; - thr->ts = data->ts; - - thr->ts.team->ordered_release[thr->ts.team_id] = &thr->release; - - if (data->nested) - { - gomp_barrier_wait (&thr->ts.team->barrier); - local_fn (local_data); - gomp_barrier_wait (&thr->ts.team->barrier); - } - else - { - gomp_threads[thr->ts.team_id] = thr; - - gomp_barrier_wait (&gomp_threads_dock); - do - { - struct gomp_team *team; - - local_fn (local_data); - - /* Clear out the team and function data. This is a debugging - signal that we're in fact back in the dock. */ - team = thr->ts.team; - thr->fn = NULL; - thr->data = NULL; - thr->ts.team = NULL; - thr->ts.work_share = NULL; - thr->ts.team_id = 0; - thr->ts.work_share_generation = 0; - thr->ts.static_trip = 0; - - gomp_barrier_wait (&team->barrier); - gomp_barrier_wait (&gomp_threads_dock); - - local_fn = thr->fn; - local_data = thr->data; - } - while (local_fn); - } - - return NULL; -} - - -/* Create a new team data structure. */ - -static struct gomp_team * -new_team (unsigned nthreads, struct gomp_work_share *work_share) -{ - struct gomp_team *team; - size_t size; - - size = sizeof (*team) + nthreads * sizeof (team->ordered_release[0]); - team = gomp_malloc (size); - gomp_mutex_init (&team->work_share_lock); - - team->work_shares = gomp_malloc (4 * sizeof (struct gomp_work_share *)); - team->generation_mask = 3; - team->oldest_live_gen = work_share == NULL; - team->num_live_gen = work_share != NULL; - team->work_shares[0] = work_share; - - team->nthreads = nthreads; - gomp_barrier_init (&team->barrier, nthreads); - - gomp_sem_init (&team->master_release, 0); - team->ordered_release[0] = &team->master_release; - - return team; -} - - -/* Free a team data structure. */ - -static void -free_team (struct gomp_team *team) -{ - free (team->work_shares); - gomp_mutex_destroy (&team->work_share_lock); - gomp_barrier_destroy (&team->barrier); - gomp_sem_destroy (&team->master_release); - free (team); -} - - -/* Launch a team. */ - -void -gomp_team_start (void (*fn) (void *), void *data, unsigned nthreads, - struct gomp_work_share *work_share) -{ - struct gomp_thread_start_data *start_data; - struct gomp_thread *thr, *nthr; - struct gomp_team *team; - bool nested; - unsigned i, n, old_threads_used = 0; - - thr = gomp_thread (); - nested = thr->ts.team != NULL; - - team = new_team (nthreads, work_share); - - /* 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.work_share = work_share; - thr->ts.team_id = 0; - thr->ts.work_share_generation = 0; - thr->ts.static_trip = 0; - - if (nthreads == 1) - return; - - i = 1; - - /* We only allow the reuse of idle threads for non-nested PARALLEL - regions. This appears to be implied by the semantics of - threadprivate variables, but perhaps that's reading too much into - things. Certainly it does prevent any locking problems, since - only the initial program thread will modify gomp_threads. */ - if (!nested) - { - old_threads_used = gomp_threads_used; - - if (nthreads <= old_threads_used) - n = nthreads; - else if (old_threads_used == 0) - { - n = 0; - gomp_barrier_init (&gomp_threads_dock, nthreads); - } - else - { - n = old_threads_used; - - /* Increase the barrier threshold to make sure all new - threads arrive before the team is released. */ - gomp_barrier_reinit (&gomp_threads_dock, nthreads); - } - - /* Not true yet, but soon will be. We're going to release all - threads from the dock, and those that aren't part of the - team will exit. */ - gomp_threads_used = nthreads; - - /* Release existing idle threads. */ - for (; i < n; ++i) - { - nthr = gomp_threads[i]; - nthr->ts.team = team; - nthr->ts.work_share = work_share; - nthr->ts.team_id = i; - nthr->ts.work_share_generation = 0; - nthr->ts.static_trip = 0; - nthr->fn = fn; - nthr->data = data; - team->ordered_release[i] = &nthr->release; - } - - if (i == nthreads) - goto do_release; - - /* If necessary, expand the size of the gomp_threads array. It is - expected that changes in the number of threads is rare, thus we - make no effort to expand gomp_threads_size geometrically. */ - if (nthreads >= gomp_threads_size) - { - gomp_threads_size = nthreads + 1; - gomp_threads - = gomp_realloc (gomp_threads, - gomp_threads_size - * sizeof (struct gomp_thread_data *)); - } - } - - start_data = gomp_alloca (sizeof (struct gomp_thread_start_data) - * (nthreads-i)); - - /* Launch new threads. */ - for (; i < nthreads; ++i, ++start_data) - { - pthread_t pt; - int err; - - start_data->ts.team = team; - start_data->ts.work_share = work_share; - start_data->ts.team_id = i; - start_data->ts.work_share_generation = 0; - start_data->ts.static_trip = 0; - start_data->fn = fn; - start_data->fn_data = data; - start_data->nested = nested; - - err = pthread_create (&pt, &gomp_thread_attr, - gomp_thread_start, start_data); - if (err != 0) - gomp_fatal ("Thread creation failed: %s", strerror (err)); - } - - do_release: - gomp_barrier_wait (nested ? &team->barrier : &gomp_threads_dock); - - /* Decrease the barrier threshold to match the number of threads - that should arrive back at the end of this team. The extra - threads should be exiting. Note that we arrange for this test - to never be true for nested teams. */ - if (nthreads < old_threads_used) - gomp_barrier_reinit (&gomp_threads_dock, nthreads); -} - - -/* Terminate the current team. This is only to be called by the master - thread. We assume that we must wait for the other threads. */ - -void -gomp_team_end (void) -{ - struct gomp_thread *thr = gomp_thread (); - struct gomp_team *team = thr->ts.team; - - gomp_barrier_wait (&team->barrier); - - thr->ts = team->prev_ts; - - free_team (team); -} - - -/* Constructors for this file. */ - -static void __attribute__((constructor)) -initialize_team (void) -{ - struct gomp_thread *thr; - -#ifndef HAVE_TLS - static struct gomp_thread initial_thread_tls_data; - - pthread_key_create (&gomp_tls_key, NULL); - pthread_setspecific (gomp_tls_key, &initial_thread_tls_data); -#endif - -#ifdef HAVE_TLS - thr = &gomp_tls_data; -#else - thr = &initial_thread_tls_data; -#endif - gomp_sem_init (&thr->release, 0); -} |