[2] | 1 | // %flair:license{
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[15] | 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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[2] | 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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[15] | 28 | SharedMem_impl::SharedMem_impl(const SharedMem *self, string name,
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[149] | 29 | size_t size, SharedMem::Type &type):type(type) {
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[15] | 30 | this->size = size;
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| 31 | this->self = self;
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[133] | 32 | char errorMsg[256];
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[2] | 33 |
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| 34 | #ifdef __XENO__
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[15] | 35 | heap_binded = false;
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| 36 | int status = rt_heap_create(&heap, name.c_str(), size,
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| 37 | H_SHARED | H_FIFO | H_NONCACHED);
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| 38 | if (status == -EEXIST) {
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| 39 | heap_binded = true;
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| 40 | status = rt_heap_bind(&heap, name.c_str(), TM_INFINITE);
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| 41 | }
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| 42 | if (status != 0) {
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[133] | 43 | self->Err("rt_heap_create error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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[15] | 44 | return;
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| 45 | }
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[2] | 46 |
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[15] | 47 | void *ptr;
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| 48 | status = rt_heap_alloc(&heap, 0, TM_NONBLOCK, &ptr);
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| 49 | if (status != 0) {
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[133] | 50 | self->Err("rt_heap_alloc error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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[15] | 51 | }
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| 52 | mem_segment = (char *)ptr;
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[2] | 53 |
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[15] | 54 | mutex_binded = false;
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| 55 | string mutex_name = "mutex_" + name;
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| 56 | status = rt_mutex_create(&mutex, mutex_name.c_str());
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| 57 | if (status == -EEXIST) {
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| 58 | mutex_binded = true;
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| 59 | status = rt_mutex_bind(&mutex, mutex_name.c_str(), TM_INFINITE);
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| 60 | }
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| 61 | if (status != 0) {
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[133] | 62 | self->Err("rt_mutex_create error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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[15] | 63 | return;
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| 64 | }
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[2] | 65 |
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| 66 | #else
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[15] | 67 | shm_name = "/" + name;
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| 68 | fd = shm_open(shm_name.c_str(), O_RDWR | O_CREAT, 0666);
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| 69 | if (fd == -1) {
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| 70 | self->Err("Error creating shared memory\n");
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| 71 | }
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| 72 | ftruncate(fd, size);
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[2] | 73 |
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[149] | 74 | if (type==SharedMem::Type::mutex) {
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| 75 | sem_name="/" + name + "_mutex";
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| 76 | sem=sem_open(sem_name.c_str(), O_CREAT, 0666, 1);
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| 77 | if (sem==SEM_FAILED) {
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| 78 | self->Err("Error creating mutex semaphore\n");
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| 79 | }
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| 80 | } else if (type==SharedMem::Type::producerConsumer) {
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| 81 | sem_name_producer="/" + name + "_producer";
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| 82 | sem_producer=sem_open(sem_name_producer.c_str(), O_CREAT, 0666, 0);
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| 83 | if (sem==SEM_FAILED) {
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| 84 | self->Err("Error creating producer semaphore\n");
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| 85 | }
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| 86 | sem_name_consumer="/" + name + "_consumer";
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| 87 | sem_consumer=sem_open(sem_name_consumer.c_str(), O_CREAT, 0666, 0);
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| 88 | if (sem==SEM_FAILED) {
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| 89 | self->Err("Error creating consumer semaphore\n");
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| 90 | }
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[15] | 91 | }
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[2] | 92 |
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[15] | 93 | mem_segment =
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| 94 | (char *)mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
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| 95 | if (mem_segment == MAP_FAILED) {
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| 96 | self->Err("Failed to map memory\n");
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| 97 | }
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[2] | 98 | #endif
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| 99 | }
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| 100 |
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[15] | 101 | SharedMem_impl::~SharedMem_impl() {
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| 102 | int status;
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[133] | 103 | char errorMsg[256];
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| 104 |
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[2] | 105 | #ifdef __XENO__
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[15] | 106 | /* unnecessary because heap is opened in H_SINGLE mode
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| 107 | status=rt_heap_free(&heap,mem_segment);
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| 108 | if(status!=0)
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| 109 | {
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[133] | 110 | self->Err("rt_heap_free error (%s)\n",strerror_r(-status, errorMsg, sizeof(errorMsg)));
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[15] | 111 | }
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| 112 | */
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[2] | 113 |
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[15] | 114 | if (heap_binded == false) {
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| 115 | status = rt_heap_delete(&heap);
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| 116 | if (status != 0) {
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[133] | 117 | self->Err("rt_heap_delete error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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[2] | 118 | }
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[15] | 119 | }
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[2] | 120 |
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[15] | 121 | if (mutex_binded == false) {
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| 122 | status = rt_mutex_delete(&mutex);
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| 123 | if (status != 0) {
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[133] | 124 | self->Err("error destroying mutex (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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[2] | 125 | }
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[15] | 126 | }
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[2] | 127 | #else
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[15] | 128 | status = munmap(mem_segment, size);
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| 129 | if (status != 0) {
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[133] | 130 | self->Err("Failed to unmap memory (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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[15] | 131 | }
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[2] | 132 |
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[15] | 133 | status = close(fd);
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| 134 | if (status != 0) {
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[133] | 135 | self->Err("Failed to close file (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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[15] | 136 | }
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[2] | 137 |
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[149] | 138 | // do not check errors as it can be done by another process
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[15] | 139 | status = shm_unlink(shm_name.c_str()); /*
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| 140 | if(status!=0)
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| 141 | {
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[133] | 142 | self->Err("Failed to unlink memory (%s)\n",strerror_r(-status, errorMsg, sizeof(errorMsg)));
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[15] | 143 | }
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[2] | 144 | */
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[149] | 145 | // do not check errors as it can be done by another process
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| 146 | if (type==SharedMem::Type::mutex) {
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| 147 | status = sem_unlink(sem_name.c_str());
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| 148 | status = sem_close(sem);
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| 149 | if (status != 0) {
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| 150 | self->Err("Failed to close mutex semaphore (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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| 151 | }
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| 152 | } else if (type==SharedMem::Type::producerConsumer) {
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| 153 | status = sem_unlink(sem_name_producer.c_str());
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| 154 | status = sem_close(sem_producer);
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| 155 | if (status != 0) {
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| 156 | self->Err("Failed to close producer semaphore (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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| 157 | }
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| 158 | status = sem_unlink(sem_name_consumer.c_str());
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| 159 | status = sem_close(sem_consumer);
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| 160 | if (status != 0) {
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| 161 | self->Err("Failed to close consumer semaphore (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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| 162 | }
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[15] | 163 | }
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[2] | 164 | #endif
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| 165 | }
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| 166 |
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[149] | 167 | void SharedMem_impl::ReaderReady() {
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| 168 | #ifdef __XENO__
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| 169 | //TODO
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| 170 | #else
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| 171 | sem_post(sem_consumer);
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| 172 | #endif
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| 173 | }
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| 174 |
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[15] | 175 | void SharedMem_impl::Write(const char *buf, size_t size) {
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[2] | 176 | #ifdef __XENO__
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[15] | 177 | int status = rt_mutex_acquire(&mutex, TM_INFINITE);
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[133] | 178 | if (status != 0) {
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| 179 | char errorMsg[256];
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| 180 | self->Err("error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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| 181 | }
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[15] | 182 | memcpy(mem_segment, buf, size);
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| 183 | status = rt_mutex_release(&mutex);
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[133] | 184 | if (status != 0) {
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| 185 | char errorMsg[256];
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| 186 | self->Err("error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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| 187 | }
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[2] | 188 | #else
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[149] | 189 | if (type==SharedMem::Type::mutex) {
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| 190 | sem_wait(sem);
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| 191 | memcpy(mem_segment, buf, size);
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| 192 | sem_post(sem);
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| 193 | } else if (type==SharedMem::Type::producerConsumer) {
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| 194 | //wait until consumer took the data away before writting a new one
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| 195 | //but should not block if nobody's there to read
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| 196 | if (sem_trywait(sem_consumer)==0) {
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| 197 | memcpy(mem_segment, buf, size);
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| 198 | sem_post(sem_producer);
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| 199 | }
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| 200 | }
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[2] | 201 | #endif
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| 202 | }
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| 203 |
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[15] | 204 | void SharedMem_impl::Read(char *buf, size_t size) {
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[2] | 205 | #ifdef __XENO__
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[15] | 206 | int status = rt_mutex_acquire(&mutex, TM_INFINITE);
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[133] | 207 | if (status != 0) {
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| 208 | char errorMsg[256];
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| 209 | self->Err("error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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| 210 | }
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[15] | 211 | memcpy(buf, mem_segment, size);
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| 212 | status = rt_mutex_release(&mutex);
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[133] | 213 | if (status != 0) {
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| 214 | char errorMsg[256];
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| 215 | self->Err("error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
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| 216 | }
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[2] | 217 | #else
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[149] | 218 | if (type==SharedMem::Type::mutex) {
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| 219 | sem_wait(sem);
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| 220 | memcpy(buf, mem_segment, size);
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| 221 | sem_post(sem);
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| 222 | } else if (type==SharedMem::Type::producerConsumer) {
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| 223 | sem_wait(sem_producer); //wait until some data is available
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| 224 | memcpy(buf, mem_segment, size);
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| 225 | sem_post(sem_consumer);
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| 226 | }
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[2] | 227 | #endif
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| 228 | }
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