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1 /* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc.
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2 Contributed by Richard Henderson <rth@redhat.com>.
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3
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4 This file is part of the GNU OpenMP Library (libgomp).
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5
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6 Libgomp is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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14 more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 /* This is the default implementation of a barrier synchronization mechanism
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26 for libgomp. This type is private to the library. Note that we rely on
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27 being able to adjust the barrier count while threads are blocked, so the
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28 POSIX pthread_barrier_t won't work. */
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29
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30 #ifndef GOMP_BARRIER_H
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31 #define GOMP_BARRIER_H 1
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32
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33 #include <pthread.h>
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34
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35 typedef struct
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36 {
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37 gomp_mutex_t mutex1;
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38 #ifndef HAVE_SYNC_BUILTINS
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39 gomp_mutex_t mutex2;
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40 #endif
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41 gomp_sem_t sem1;
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42 gomp_sem_t sem2;
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43 unsigned total;
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44 unsigned arrived;
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45 unsigned generation;
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46 } gomp_barrier_t;
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47 typedef unsigned int gomp_barrier_state_t;
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48
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49 extern void gomp_barrier_init (gomp_barrier_t *, unsigned);
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50 extern void gomp_barrier_reinit (gomp_barrier_t *, unsigned);
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51 extern void gomp_barrier_destroy (gomp_barrier_t *);
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52
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53 extern void gomp_barrier_wait (gomp_barrier_t *);
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54 extern void gomp_barrier_wait_end (gomp_barrier_t *, gomp_barrier_state_t);
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55 extern void gomp_team_barrier_wait (gomp_barrier_t *);
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56 extern void gomp_team_barrier_wait_end (gomp_barrier_t *,
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57 gomp_barrier_state_t);
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58 extern void gomp_team_barrier_wake (gomp_barrier_t *, int);
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59
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60 static inline gomp_barrier_state_t
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61 gomp_barrier_wait_start (gomp_barrier_t *bar)
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62 {
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63 unsigned int ret;
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64 gomp_mutex_lock (&bar->mutex1);
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65 ret = bar->generation & ~3;
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66 ret += ++bar->arrived == bar->total;
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67 return ret;
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68 }
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69
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70 static inline bool
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71 gomp_barrier_last_thread (gomp_barrier_state_t state)
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72 {
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73 return state & 1;
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74 }
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75
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76 static inline void
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77 gomp_barrier_wait_last (gomp_barrier_t *bar)
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78 {
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79 gomp_barrier_wait (bar);
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80 }
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81
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82 /* All the inlines below must be called with team->task_lock
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83 held. */
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84
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85 static inline void
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86 gomp_team_barrier_set_task_pending (gomp_barrier_t *bar)
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87 {
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88 bar->generation |= 1;
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89 }
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90
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91 static inline void
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92 gomp_team_barrier_clear_task_pending (gomp_barrier_t *bar)
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93 {
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94 bar->generation &= ~1;
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95 }
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96
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97 static inline void
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98 gomp_team_barrier_set_waiting_for_tasks (gomp_barrier_t *bar)
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99 {
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100 bar->generation |= 2;
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101 }
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102
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103 static inline bool
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104 gomp_team_barrier_waiting_for_tasks (gomp_barrier_t *bar)
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105 {
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106 return (bar->generation & 2) != 0;
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107 }
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108
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109 static inline void
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110 gomp_team_barrier_done (gomp_barrier_t *bar, gomp_barrier_state_t state)
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111 {
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112 bar->generation = (state & ~3) + 4;
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113 }
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114
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115 #endif /* GOMP_BARRIER_H */
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