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1 /* Copyright (C) 2005-2020 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 Offloading and Multi Processing Library
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5 (libgomp).
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6
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7 Libgomp is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by
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9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
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11
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12 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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14 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 Under Section 7 of GPL version 3, you are granted additional
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18 permissions described in the GCC Runtime Library Exception, version
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19 3.1, as published by the Free Software Foundation.
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20
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21 You should have received a copy of the GNU General Public License and
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22 a copy of the GCC Runtime Library Exception along with this program;
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23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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24 <http://www.gnu.org/licenses/>. */
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25
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26 /* This is a generic implementation of the public OpenMP locking primitives in
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27 terms of internal gomp_mutex_t. It is not meant to be compiled on its own.
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28 It is #include'd from config/{linux,nvptx}/lock.c. */
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29
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30 #include <string.h>
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31 #include "libgomp.h"
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32
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33 /* The internal gomp_mutex_t and the external non-recursive omp_lock_t
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34 have the same form. Re-use it. */
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35
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36 void
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37 gomp_init_lock_30 (omp_lock_t *lock)
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38 {
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39 gomp_mutex_init (lock);
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40 }
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41
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42 void
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43 gomp_destroy_lock_30 (omp_lock_t *lock)
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44 {
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45 gomp_mutex_destroy (lock);
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46 }
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47
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48 void
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49 gomp_set_lock_30 (omp_lock_t *lock)
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50 {
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51 gomp_mutex_lock (lock);
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52 }
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53
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54 void
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55 gomp_unset_lock_30 (omp_lock_t *lock)
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56 {
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57 gomp_mutex_unlock (lock);
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58 }
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59
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60 int
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61 gomp_test_lock_30 (omp_lock_t *lock)
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62 {
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63 int oldval = 0;
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64
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65 return __atomic_compare_exchange_n (lock, &oldval, 1, false,
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66 MEMMODEL_ACQUIRE, MEMMODEL_RELAXED);
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67 }
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68
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69 void
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70 gomp_init_nest_lock_30 (omp_nest_lock_t *lock)
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71 {
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72 memset (lock, '\0', sizeof (*lock));
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73 }
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74
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75 void
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76 gomp_destroy_nest_lock_30 (omp_nest_lock_t *lock)
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77 {
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78 }
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79
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80 void
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81 gomp_set_nest_lock_30 (omp_nest_lock_t *lock)
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82 {
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83 void *me = gomp_icv (true);
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84
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85 if (lock->owner != me)
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86 {
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87 gomp_mutex_lock (&lock->lock);
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88 lock->owner = me;
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89 }
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90
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91 lock->count++;
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92 }
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93
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94 void
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95 gomp_unset_nest_lock_30 (omp_nest_lock_t *lock)
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96 {
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97 if (--lock->count == 0)
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98 {
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99 lock->owner = NULL;
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100 gomp_mutex_unlock (&lock->lock);
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101 }
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102 }
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103
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104 int
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105 gomp_test_nest_lock_30 (omp_nest_lock_t *lock)
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106 {
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107 void *me = gomp_icv (true);
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108 int oldval;
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109
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110 if (lock->owner == me)
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111 return ++lock->count;
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112
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113 oldval = 0;
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114 if (__atomic_compare_exchange_n (&lock->lock, &oldval, 1, false,
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115 MEMMODEL_ACQUIRE, MEMMODEL_RELAXED))
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116 {
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117 lock->owner = me;
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118 lock->count = 1;
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119 return 1;
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120 }
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121
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122 return 0;
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123 }
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