source: flair-src/trunk/lib/FlairCore/src/SharedMem_impl.cpp@ 15

Last change on this file since 15 was 15, checked in by Bayard Gildas, 6 years ago

sources reformatted with flair-format-dir script

File size: 4.3 KB
Line 
1// %flair:license{
2// This file is part of the Flair framework distributed under the
3// CECILL-C License, Version 1.0.
4// %flair:license}
5// created: 2014/02/10
6// filename: SharedMem_impl.cpp
7//
8// author: Guillaume Sanahuja
9// Copyright Heudiasyc UMR UTC/CNRS 7253
10//
11// version: $Id: $
12//
13// purpose: Class defining a shared memory
14//
15//
16/*********************************************************************/
17
18#include "SharedMem_impl.h"
19#include "SharedMem.h"
20#include <fcntl.h>
21#include <unistd.h>
22#include <sys/mman.h>
23#include <string.h>
24
25using std::string;
26using namespace flair::core;
27
28SharedMem_impl::SharedMem_impl(const SharedMem *self, string name,
29 size_t size) {
30 this->size = size;
31 this->self = self;
32
33#ifdef __XENO__
34 heap_binded = false;
35 int status = rt_heap_create(&heap, name.c_str(), size,
36 H_SHARED | H_FIFO | H_NONCACHED);
37 if (status == -EEXIST) {
38 heap_binded = true;
39 status = rt_heap_bind(&heap, name.c_str(), TM_INFINITE);
40 }
41 if (status != 0) {
42 self->Err("rt_heap_create error (%s)\n", strerror(-status));
43 return;
44 }
45
46 void *ptr;
47 status = rt_heap_alloc(&heap, 0, TM_NONBLOCK, &ptr);
48 if (status != 0) {
49 self->Err("rt_heap_alloc error (%s)\n", strerror(-status));
50 }
51 mem_segment = (char *)ptr;
52
53 mutex_binded = false;
54 string mutex_name = "mutex_" + name;
55 status = rt_mutex_create(&mutex, mutex_name.c_str());
56 if (status == -EEXIST) {
57 mutex_binded = true;
58 status = rt_mutex_bind(&mutex, mutex_name.c_str(), TM_INFINITE);
59 }
60 if (status != 0) {
61 self->Err("rt_mutex_create error (%s)\n", strerror(-status));
62 return;
63 }
64
65#else
66 shm_name = "/" + name;
67 fd = shm_open(shm_name.c_str(), O_RDWR | O_CREAT, 0666);
68 if (fd == -1) {
69 self->Err("Error creating shared memory\n");
70 }
71 ftruncate(fd, size);
72
73 sem_name = "/" + name;
74 sem = sem_open(sem_name.c_str(), O_CREAT, 0666, 1);
75 if (sem == SEM_FAILED) {
76 self->Err("Error creating semaphore\n");
77 }
78
79 mem_segment =
80 (char *)mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
81 if (mem_segment == MAP_FAILED) {
82 self->Err("Failed to map memory\n");
83 }
84#endif
85}
86
87SharedMem_impl::~SharedMem_impl() {
88 int status;
89#ifdef __XENO__
90 /* unnecessary because heap is opened in H_SINGLE mode
91 status=rt_heap_free(&heap,mem_segment);
92 if(status!=0)
93 {
94 self->Err("rt_heap_free error (%s)\n",strerror(-status));
95 }
96 */
97
98 if (heap_binded == false) {
99 status = rt_heap_delete(&heap);
100 if (status != 0) {
101 self->Err("rt_heap_delete error (%s)\n", strerror(-status));
102 }
103 }
104
105 if (mutex_binded == false) {
106 status = rt_mutex_delete(&mutex);
107 if (status != 0) {
108 self->Err("error destroying mutex (%s)\n", strerror(-status));
109 }
110 }
111#else
112 status = munmap(mem_segment, size);
113 if (status != 0) {
114 self->Err("Failed to unmap memory (%s)\n", strerror(-status));
115 }
116
117 status = close(fd);
118 if (status != 0) {
119 self->Err("Failed to close file (%s)\n", strerror(-status));
120 }
121
122 // do not check erros as it can be done by another process
123 status = shm_unlink(shm_name.c_str()); /*
124 if(status!=0)
125 {
126 self->Err("Failed to unlink memory (%s)\n",strerror(-status));
127 }
128*/
129 // do not check erros as it can be done by another process
130 status = sem_unlink(sem_name.c_str()); /*
131 if(status!=0)
132 {
133 self->Err("Failed to unlink semaphore (%s)\n",strerror(-status));
134 }*/
135
136 status = sem_close(sem);
137 if (status != 0) {
138 self->Err("Failed to close semaphore (%s)\n", strerror(-status));
139 }
140#endif
141}
142
143void SharedMem_impl::Write(const char *buf, size_t size) {
144#ifdef __XENO__
145 int status = rt_mutex_acquire(&mutex, TM_INFINITE);
146 if (status != 0)
147 self->Err("error (%s)\n", strerror(-status));
148 memcpy(mem_segment, buf, size);
149 status = rt_mutex_release(&mutex);
150 if (status != 0)
151 self->Err("error (%s)\n", strerror(-status));
152#else
153 sem_wait(sem);
154 memcpy(mem_segment, buf, size);
155 sem_post(sem);
156#endif
157}
158
159void SharedMem_impl::Read(char *buf, size_t size) {
160#ifdef __XENO__
161 int status = rt_mutex_acquire(&mutex, TM_INFINITE);
162 if (status != 0)
163 self->Err("error (%s)\n", strerror(-status));
164 memcpy(buf, mem_segment, size);
165 status = rt_mutex_release(&mutex);
166 if (status != 0)
167 self->Err("error (%s)\n", strerror(-status));
168#else
169 sem_wait(sem);
170 memcpy(buf, mem_segment, size);
171 sem_post(sem);
172#endif
173}
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