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: 2014/02/10
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6 | // filename: SharedMem_impl.cpp
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7 | //
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8 | // author: Guillaume Sanahuja
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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 shared memory
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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 "SharedMem_impl.h"
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19 | #include "SharedMem.h"
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20 | #include <fcntl.h>
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21 | #include <unistd.h>
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22 | #include <sys/mman.h>
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23 | #include <string.h>
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24 |
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25 | using std::string;
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26 | using namespace flair::core;
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27 |
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28 | SharedMem_impl::SharedMem_impl(const SharedMem *self, string name,
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29 | size_t size) {
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30 | this->size = size;
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31 | this->self = self;
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32 |
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33 | #ifdef __XENO__
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34 | heap_binded = false;
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35 | int status = rt_heap_create(&heap, name.c_str(), size,
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36 | H_SHARED | H_FIFO | H_NONCACHED);
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37 | if (status == -EEXIST) {
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38 | heap_binded = true;
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39 | status = rt_heap_bind(&heap, name.c_str(), TM_INFINITE);
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40 | }
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41 | if (status != 0) {
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42 | self->Err("rt_heap_create error (%s)\n", strerror(-status));
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43 | return;
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44 | }
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45 |
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46 | void *ptr;
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47 | status = rt_heap_alloc(&heap, 0, TM_NONBLOCK, &ptr);
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48 | if (status != 0) {
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49 | self->Err("rt_heap_alloc error (%s)\n", strerror(-status));
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50 | }
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51 | mem_segment = (char *)ptr;
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52 |
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53 | mutex_binded = false;
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54 | string mutex_name = "mutex_" + name;
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55 | status = rt_mutex_create(&mutex, mutex_name.c_str());
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56 | if (status == -EEXIST) {
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57 | mutex_binded = true;
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58 | status = rt_mutex_bind(&mutex, mutex_name.c_str(), TM_INFINITE);
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59 | }
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60 | if (status != 0) {
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61 | self->Err("rt_mutex_create error (%s)\n", strerror(-status));
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62 | return;
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63 | }
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64 |
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65 | #else
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66 | shm_name = "/" + name;
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67 | fd = shm_open(shm_name.c_str(), O_RDWR | O_CREAT, 0666);
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68 | if (fd == -1) {
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69 | self->Err("Error creating shared memory\n");
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70 | }
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71 | ftruncate(fd, size);
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72 |
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73 | sem_name = "/" + name;
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74 | sem = sem_open(sem_name.c_str(), O_CREAT, 0666, 1);
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75 | if (sem == SEM_FAILED) {
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76 | self->Err("Error creating semaphore\n");
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77 | }
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78 |
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79 | mem_segment =
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80 | (char *)mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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81 | if (mem_segment == MAP_FAILED) {
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82 | self->Err("Failed to map memory\n");
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83 | }
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84 | #endif
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85 | }
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86 |
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87 | SharedMem_impl::~SharedMem_impl() {
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88 | int status;
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89 | #ifdef __XENO__
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90 | /* unnecessary because heap is opened in H_SINGLE mode
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91 | status=rt_heap_free(&heap,mem_segment);
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92 | if(status!=0)
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93 | {
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94 | self->Err("rt_heap_free error (%s)\n",strerror(-status));
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95 | }
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96 | */
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97 |
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98 | if (heap_binded == false) {
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99 | status = rt_heap_delete(&heap);
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100 | if (status != 0) {
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101 | self->Err("rt_heap_delete error (%s)\n", strerror(-status));
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102 | }
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103 | }
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104 |
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105 | if (mutex_binded == false) {
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106 | status = rt_mutex_delete(&mutex);
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107 | if (status != 0) {
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108 | self->Err("error destroying mutex (%s)\n", strerror(-status));
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109 | }
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110 | }
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111 | #else
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112 | status = munmap(mem_segment, size);
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113 | if (status != 0) {
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114 | self->Err("Failed to unmap memory (%s)\n", strerror(-status));
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115 | }
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116 |
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117 | status = close(fd);
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118 | if (status != 0) {
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119 | self->Err("Failed to close file (%s)\n", strerror(-status));
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120 | }
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121 |
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122 | // do not check erros as it can be done by another process
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123 | status = shm_unlink(shm_name.c_str()); /*
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124 | if(status!=0)
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125 | {
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126 | self->Err("Failed to unlink memory (%s)\n",strerror(-status));
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127 | }
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128 | */
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129 | // do not check erros as it can be done by another process
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130 | status = sem_unlink(sem_name.c_str()); /*
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131 | if(status!=0)
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132 | {
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133 | self->Err("Failed to unlink semaphore (%s)\n",strerror(-status));
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134 | }*/
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135 |
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136 | status = sem_close(sem);
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137 | if (status != 0) {
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138 | self->Err("Failed to close semaphore (%s)\n", strerror(-status));
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139 | }
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140 | #endif
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141 | }
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142 |
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143 | void SharedMem_impl::Write(const char *buf, size_t size) {
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144 | #ifdef __XENO__
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145 | int status = rt_mutex_acquire(&mutex, TM_INFINITE);
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146 | if (status != 0)
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147 | self->Err("error (%s)\n", strerror(-status));
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148 | memcpy(mem_segment, buf, size);
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149 | status = rt_mutex_release(&mutex);
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150 | if (status != 0)
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151 | self->Err("error (%s)\n", strerror(-status));
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152 | #else
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153 | sem_wait(sem);
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154 | memcpy(mem_segment, buf, size);
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155 | sem_post(sem);
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156 | #endif
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157 | }
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158 |
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159 | void SharedMem_impl::Read(char *buf, size_t size) {
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160 | #ifdef __XENO__
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161 | int status = rt_mutex_acquire(&mutex, TM_INFINITE);
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162 | if (status != 0)
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163 | self->Err("error (%s)\n", strerror(-status));
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164 | memcpy(buf, mem_segment, size);
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165 | status = rt_mutex_release(&mutex);
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166 | if (status != 0)
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167 | self->Err("error (%s)\n", strerror(-status));
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168 | #else
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169 | sem_wait(sem);
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170 | memcpy(buf, mem_segment, size);
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171 | sem_post(sem);
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172 | #endif
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173 | }
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