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pool.h revision 1.1.1.8 
      1 /* Copyright (C) 2005-2022 Free Software Foundation, Inc.
      2    Contributed by Sebastian Huber <sebastian.huber (at) embedded-brains.de>.
      3 
      4    This file is part of the GNU Offloading and Multi Processing Library
      5    (libgomp).
      6 
      7    Libgomp is free software; you can redistribute it and/or modify it
      8    under the terms of the GNU General Public License as published by
      9    the Free Software Foundation; either version 3, or (at your option)
     10    any later version.
     11 
     12    Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
     13    WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
     14    FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
     15    more details.
     16 
     17    Under Section 7 of GPL version 3, you are granted additional
     18    permissions described in the GCC Runtime Library Exception, version
     19    3.1, as published by the Free Software Foundation.
     20 
     21    You should have received a copy of the GNU General Public License and
     22    a copy of the GCC Runtime Library Exception along with this program;
     23    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
     24    <http://www.gnu.org/licenses/>.  */
     25 
     26 /* This is the default implementation of the thread pool management
     27    for libgomp.  This type is private to the library.  */
     28 
     29 #ifndef GOMP_POOL_H
     30 #define GOMP_POOL_H 1
     31 
     32 #include "libgomp.h"
     33 
     34 /* Get the thread pool, allocate and initialize it on demand.  */
     35 
     36 static inline struct gomp_thread_pool *
     37 gomp_get_thread_pool (struct gomp_thread *thr, unsigned nthreads)
     38 {
     39   struct gomp_thread_pool *pool = thr->thread_pool;
     40   if (__builtin_expect (pool == NULL, 0))
     41     {
     42       pool = gomp_malloc (sizeof (*pool));
     43       pool->threads = NULL;
     44       pool->threads_size = 0;
     45       pool->threads_used = 0;
     46       pool->last_team = NULL;
     47       pool->threads_busy = nthreads;
     48       thr->thread_pool = pool;
     49       pthread_setspecific (gomp_thread_destructor, thr);
     50     }
     51   return pool;
     52 }
     53 
     54 static inline void
     55 gomp_release_thread_pool (struct gomp_thread_pool *pool)
     56 {
     57   /* Do nothing in the default implementation.  */
     58 }
     59 
     60 static inline pthread_attr_t *
     61 gomp_adjust_thread_attr (pthread_attr_t *attr, pthread_attr_t *mutable_attr)
     62 {
     63   /* Do nothing in the default implementation.  */
     64   return attr;
     65 }
     66 
     67 #endif /* GOMP_POOL_H */
     68