| 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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