1 /* Copyright (C) 2015 Free Software Foundation, Inc.
2 Contributed by Sebastian Huber <sebastian.huber@embedded-brains.de>.
4 This file is part of the GNU Offloading and Multi Processing Library
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)
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
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.
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/>. */
26 /* This is the RTEMS implementation of the thread pool management
27 for libgomp. This type is private to the library. */
36 /* For each scheduler instance there may be a thread pool reservoir
37 to limit the number of thread pools used by the OpenMP master threads of this
38 scheduler instance. The reservoirs are configured via the
39 GOMP_RTEMS_THREAD_POOLS environment variable. */
40 struct gomp_thread_pool_reservoir
{
44 struct gomp_thread_pool
*pools
[];
47 struct gomp_tls_rtems_data
{
48 struct gomp_thread_pool_reservoir
*thread_pool_reservoir
;
51 extern struct gomp_thread_pool_reservoir
**gomp_thread_pool_reservoirs
;
53 extern __thread
struct gomp_tls_rtems_data gomp_tls_rtems_data
;
55 static inline struct gomp_thread_pool_reservoir
*
56 gomp_get_thread_pool_reservoir (void)
58 struct gomp_thread_pool_reservoir
*res
=
59 gomp_tls_rtems_data
.thread_pool_reservoir
;
61 if (res
== NULL
&& gomp_thread_pool_reservoirs
!= NULL
)
63 struct gomp_thread
*thr
= gomp_thread ();
64 thr
->thread_pool
= gomp_malloc_cleared (sizeof (*thr
->thread_pool
));
65 res
= gomp_thread_pool_reservoirs
[_Sched_Index ()];
66 gomp_tls_rtems_data
.thread_pool_reservoir
= res
;
72 static inline struct gomp_thread_pool
*
73 gomp_get_own_thread_pool (struct gomp_thread
*thr
, unsigned nthreads
)
75 struct gomp_thread_pool
*pool
= thr
->thread_pool
;
76 if (__builtin_expect (pool
== NULL
, 0))
78 pool
= gomp_malloc_cleared (sizeof (*pool
));
79 pool
->threads_busy
= nthreads
;
80 thr
->thread_pool
= pool
;
85 static inline struct gomp_thread_pool
*
86 gomp_get_thread_pool (struct gomp_thread
*thr
, unsigned nthreads
)
88 struct gomp_thread_pool
*pool
;
90 if (__builtin_expect (thr
->thread_pool
== NULL
, 0))
91 pthread_setspecific (gomp_thread_destructor
, thr
);
95 struct gomp_thread_pool_reservoir
*res
=
96 gomp_get_thread_pool_reservoir ();
99 gomp_sem_wait (&res
->available
);
100 gomp_mutex_lock (&res
->lock
);
101 pool
= res
->pools
[--res
->index
];
102 gomp_mutex_unlock (&res
->lock
);
103 pool
->threads_busy
= nthreads
;
104 thr
->thread_pool
= pool
;
107 pool
= gomp_get_own_thread_pool (thr
, nthreads
);
115 gomp_release_thread_pool (struct gomp_thread_pool
*pool
)
117 struct gomp_thread_pool_reservoir
*res
=
118 gomp_tls_rtems_data
.thread_pool_reservoir
;
121 gomp_mutex_lock (&res
->lock
);
122 res
->pools
[res
->index
++] = pool
;
123 gomp_mutex_unlock (&res
->lock
);
124 gomp_sem_post (&res
->available
);
128 #endif /* GOMP_POOL_H */