1 | /* SPDX-License-Identifier: BSD-2-Clause */ |
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2 | |
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3 | /** |
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4 | * @file |
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5 | * |
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6 | * @ingroup POSIXAPI |
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7 | * |
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8 | * @brief Suspends Execution of calling thread until Time elapses |
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9 | */ |
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10 | |
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11 | /* |
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12 | * COPYRIGHT (c) 1989-2015. |
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13 | * On-Line Applications Research Corporation (OAR). |
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14 | * |
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15 | * Copyright (c) 2016. Gedare Bloom. |
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16 | * |
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17 | * Redistribution and use in source and binary forms, with or without |
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18 | * modification, are permitted provided that the following conditions |
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19 | * are met: |
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20 | * 1. Redistributions of source code must retain the above copyright |
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21 | * notice, this list of conditions and the following disclaimer. |
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22 | * 2. Redistributions in binary form must reproduce the above copyright |
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23 | * notice, this list of conditions and the following disclaimer in the |
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24 | * documentation and/or other materials provided with the distribution. |
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25 | * |
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26 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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27 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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28 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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29 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
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30 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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31 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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32 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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33 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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34 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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35 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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36 | * POSSIBILITY OF SUCH DAMAGE. |
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37 | */ |
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38 | |
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39 | #ifdef HAVE_CONFIG_H |
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40 | #include "config.h" |
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41 | #endif |
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42 | |
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43 | #include <time.h> |
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44 | |
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45 | #include <rtems/score/threadimpl.h> |
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46 | #include <rtems/score/threadqimpl.h> |
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47 | #include <rtems/score/timespec.h> |
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48 | #include <rtems/score/timecounter.h> |
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49 | #include <rtems/score/watchdogimpl.h> |
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50 | #include <rtems/posix/posixapi.h> |
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51 | |
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52 | static Thread_queue_Control _Nanosleep_Pseudo_queue = |
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53 | THREAD_QUEUE_INITIALIZER( "Nanosleep" ); |
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54 | |
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55 | /* |
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56 | * High Resolution Sleep with Specifiable Clock, IEEE Std 1003.1, 2001 |
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57 | */ |
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58 | int clock_nanosleep( |
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59 | clockid_t clock_id, |
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60 | int flags, |
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61 | const struct timespec *rqtp, |
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62 | struct timespec *rmtp |
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63 | ) |
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64 | { |
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65 | Thread_queue_Context queue_context; |
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66 | bool absolute; |
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67 | Thread_Control *executing; |
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68 | int eno; |
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69 | |
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70 | if ( clock_id != CLOCK_REALTIME && clock_id != CLOCK_MONOTONIC ) { |
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71 | return ENOTSUP; |
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72 | } |
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73 | |
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74 | _Thread_queue_Context_initialize( &queue_context ); |
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75 | _Thread_queue_Context_set_thread_state( |
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76 | &queue_context, |
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77 | STATES_WAITING_FOR_TIME | STATES_INTERRUPTIBLE_BY_SIGNAL |
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78 | ); |
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79 | |
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80 | if ( ( flags & TIMER_ABSTIME ) != 0 ) { |
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81 | absolute = true; |
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82 | rmtp = NULL; |
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83 | } else { |
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84 | absolute = false; |
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85 | } |
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86 | |
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87 | if ( clock_id == CLOCK_REALTIME ) { |
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88 | _Thread_queue_Context_set_enqueue_timeout_realtime_timespec( |
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89 | &queue_context, |
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90 | rqtp, |
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91 | absolute |
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92 | ); |
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93 | } else { |
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94 | _Thread_queue_Context_set_enqueue_timeout_monotonic_timespec( |
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95 | &queue_context, |
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96 | rqtp, |
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97 | absolute |
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98 | ); |
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99 | } |
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100 | |
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101 | _Thread_queue_Acquire( &_Nanosleep_Pseudo_queue, &queue_context ); |
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102 | executing = _Thread_Executing; |
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103 | _Thread_queue_Enqueue( |
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104 | &_Nanosleep_Pseudo_queue.Queue, |
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105 | &_Thread_queue_Operations_FIFO, |
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106 | executing, |
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107 | &queue_context |
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108 | ); |
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109 | eno = _POSIX_Get_error_after_wait( executing ); |
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110 | |
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111 | if ( eno == ETIMEDOUT ) { |
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112 | eno = 0; |
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113 | } |
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114 | |
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115 | if ( rmtp != NULL ) { |
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116 | #if defined( RTEMS_POSIX_API ) |
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117 | if ( eno == EINTR ) { |
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118 | struct timespec actual_end; |
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119 | struct timespec planned_end; |
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120 | |
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121 | if ( clock_id == CLOCK_REALTIME ) { |
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122 | _Timecounter_Nanotime( &actual_end ); |
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123 | } else { |
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124 | _Timecounter_Nanouptime( &actual_end ); |
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125 | } |
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126 | |
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127 | _Watchdog_Ticks_to_timespec( |
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128 | executing->Timer.Watchdog.expire, |
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129 | &planned_end |
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130 | ); |
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131 | |
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132 | if ( _Timespec_Less_than( &actual_end, &planned_end ) ) { |
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133 | _Timespec_Subtract( &actual_end, &planned_end, rmtp ); |
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134 | } else { |
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135 | _Timespec_Set_to_zero( rmtp ); |
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136 | } |
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137 | } else { |
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138 | _Timespec_Set_to_zero( rmtp ); |
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139 | } |
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140 | #else |
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141 | _Assert( eno != EINTR ); |
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142 | _Timespec_Set_to_zero( rmtp ); |
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143 | #endif |
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144 | } |
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145 | |
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146 | return eno; |
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147 | } |
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