1 | // %flair:license{
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2 | // This file is part of the Flair framework distributed under the
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3 | // CECILL-C License, Version 1.0.
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4 | // %flair:license}
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5 | // created: 2016/11/16
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6 | // filename: Semaphore_impl.cpp
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7 | //
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8 | // author: Thomas Fuhrmann
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9 | // Copyright Heudiasyc UMR UTC/CNRS 7253
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10 | //
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11 | // version: $Id: $
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12 | //
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13 | // purpose: Class defining a semaphore implementation
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14 | //
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15 | //
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16 | /*********************************************************************/
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17 |
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18 | #include "Semaphore.h"
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19 | #include "Semaphore_impl.h"
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20 |
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21 | #include <string.h>
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22 | #include <time.h>
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23 |
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24 | using std::string;
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25 | using namespace flair::core;
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26 |
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27 | Semaphore_impl::Semaphore_impl(Semaphore *self, string name, uint32_t initialValue, Semaphore::Type &type):type(type) {
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28 | this->self = self;
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29 | int status;
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30 |
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31 | #ifdef __XENO__
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32 | status = rt_sem_create(&semaphore, NULL, initialValue, S_FIFO);
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33 | #else
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34 | if (type==Semaphore::Type::named) {
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35 | sem_name = "/" + name;
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36 | semaphore=sem_open(sem_name.c_str(),O_CREAT, 0666, initialValue);
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37 | if (semaphore==SEM_FAILED) status=errno; else status=0;
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38 | } else { //anonymous
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39 | semaphore=new sem_t;
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40 | status = sem_init(semaphore, 0, initialValue);
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41 | }
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42 | #endif
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43 | if (status != 0) {
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44 | char errorMsg[256];
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45 | self->Err("error creating semaphore (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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46 | }
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47 | }
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48 |
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49 | Semaphore_impl::~Semaphore_impl() {
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50 | int status;
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51 |
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52 | #ifdef __XENO__
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53 | status = rt_sem_delete(&semaphore);
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54 | #else
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55 | if (type==Semaphore::Type::named) {
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56 | status=sem_close(semaphore);
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57 | sem_unlink(sem_name.c_str());
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58 | } else { //anonymous
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59 | status = sem_destroy(semaphore);
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60 | }
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61 | #endif
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62 | if (status != 0) {
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63 | char errorMsg[256];
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64 | self->Err("error destroying semaphore (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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65 | }
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66 | }
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67 |
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68 | bool Semaphore_impl::TryGetSemaphore() {
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69 | #ifdef __XENO__
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70 | return !rt_sem_p(&semaphore, TM_NONBLOCK);
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71 | #else
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72 | return !sem_trywait(semaphore);
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73 | #endif
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74 | }
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75 |
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76 | bool Semaphore_impl::GetSemaphore(Time timeout) {
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77 | int status;
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78 | bool returnValue = true;
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79 | #ifdef __XENO__
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80 | status = rt_sem_p(&semaphore, timeout);
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81 | #else
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82 | if (timeout != 0) {
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83 | struct timespec semTimeout;
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84 | clock_gettime(CLOCK_REALTIME, &semTimeout);
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85 | semTimeout.tv_sec += timeout / 1000000000ULL;
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86 | semTimeout.tv_nsec += timeout % 1000000000ULL;
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87 | if (semTimeout.tv_nsec >= 1000000000ULL) {
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88 | semTimeout.tv_sec++;
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89 | semTimeout.tv_nsec -= 1000000000ULL;
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90 | }
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91 | status = sem_timedwait(semaphore, &semTimeout);
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92 | } else {
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93 | status = sem_wait(semaphore);
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94 | }
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95 | #endif
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96 | if (status != 0) {
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97 | if (errno == ETIMEDOUT) {
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98 | #ifdef DEBUG
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99 | self->Warn("warning : semaphore timedout\n");
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100 | #endif
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101 | } else {
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102 | char errorMsg[256];
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103 | self->Err("error getting the semaphore (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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104 | }
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105 | returnValue = false;
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106 | }
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107 | return returnValue;
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108 | }
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109 |
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110 | bool Semaphore_impl::ReleaseSemaphore(void) {
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111 | int status;
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112 | bool returnValue = true;
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113 | #ifdef __XENO__
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114 | status = rt_sem_v(&semaphore);
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115 | #else
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116 | status = sem_post(semaphore);
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117 | #endif
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118 | if (status != 0) {
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119 | char errorMsg[256];
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120 | self->Err("error releasing the semaphore (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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121 | returnValue = false;
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122 | }
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123 | return returnValue;
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124 | }
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