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 |
|
---|
25 | using std::string;
|
---|
26 | using namespace flair::core;
|
---|
27 |
|
---|
28 | SharedMem_impl::SharedMem_impl(const SharedMem *self, string name,
|
---|
29 | size_t size, SharedMem::Type &type):type(type) {
|
---|
30 | this->size = size;
|
---|
31 | this->self = self;
|
---|
32 | char errorMsg[256];
|
---|
33 |
|
---|
34 | #ifdef __XENO__
|
---|
35 | heap_binded = false;
|
---|
36 | int status = rt_heap_create(&heap, name.c_str(), size,
|
---|
37 | H_SHARED | H_FIFO | H_NONCACHED);
|
---|
38 | if (status == -EEXIST) {
|
---|
39 | heap_binded = true;
|
---|
40 | status = rt_heap_bind(&heap, name.c_str(), TM_INFINITE);
|
---|
41 | }
|
---|
42 | if (status != 0) {
|
---|
43 | self->Err("rt_heap_create error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
44 | return;
|
---|
45 | }
|
---|
46 |
|
---|
47 | void *ptr;
|
---|
48 | status = rt_heap_alloc(&heap, 0, TM_NONBLOCK, &ptr);
|
---|
49 | if (status != 0) {
|
---|
50 | self->Err("rt_heap_alloc error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
51 | }
|
---|
52 | mem_segment = (char *)ptr;
|
---|
53 |
|
---|
54 | mutex_binded = false;
|
---|
55 | string mutex_name = "mutex_" + name;
|
---|
56 | status = rt_mutex_create(&mutex, mutex_name.c_str());
|
---|
57 | if (status == -EEXIST) {
|
---|
58 | mutex_binded = true;
|
---|
59 | status = rt_mutex_bind(&mutex, mutex_name.c_str(), TM_INFINITE);
|
---|
60 | }
|
---|
61 | if (status != 0) {
|
---|
62 | self->Err("rt_mutex_create error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
63 | return;
|
---|
64 | }
|
---|
65 |
|
---|
66 | #else
|
---|
67 | shm_name = "/" + name;
|
---|
68 | fd = shm_open(shm_name.c_str(), O_RDWR | O_CREAT, 0666);
|
---|
69 | if (fd == -1) {
|
---|
70 | self->Err("Error creating shared memory\n");
|
---|
71 | }
|
---|
72 | ftruncate(fd, size);
|
---|
73 |
|
---|
74 | if (type==SharedMem::Type::mutex) {
|
---|
75 | sem_name="/" + name + "_mutex";
|
---|
76 | sem=sem_open(sem_name.c_str(), O_CREAT, 0666, 1);
|
---|
77 | if (sem==SEM_FAILED) {
|
---|
78 | self->Err("Error creating mutex semaphore\n");
|
---|
79 | }
|
---|
80 | } else if (type==SharedMem::Type::producerConsumer) {
|
---|
81 | sem_name_producer="/" + name + "_producer";
|
---|
82 | sem_producer=sem_open(sem_name_producer.c_str(), O_CREAT, 0666, 0);
|
---|
83 | if (sem==SEM_FAILED) {
|
---|
84 | self->Err("Error creating producer semaphore\n");
|
---|
85 | }
|
---|
86 | sem_name_consumer="/" + name + "_consumer";
|
---|
87 | sem_consumer=sem_open(sem_name_consumer.c_str(), O_CREAT, 0666, 0);
|
---|
88 | if (sem==SEM_FAILED) {
|
---|
89 | self->Err("Error creating consumer semaphore\n");
|
---|
90 | }
|
---|
91 | }
|
---|
92 |
|
---|
93 | mem_segment =
|
---|
94 | (char *)mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
|
---|
95 | if (mem_segment == MAP_FAILED) {
|
---|
96 | self->Err("Failed to map memory\n");
|
---|
97 | }
|
---|
98 | #endif
|
---|
99 | }
|
---|
100 |
|
---|
101 | SharedMem_impl::~SharedMem_impl() {
|
---|
102 | int status;
|
---|
103 | char errorMsg[256];
|
---|
104 |
|
---|
105 | #ifdef __XENO__
|
---|
106 | /* unnecessary because heap is opened in H_SINGLE mode
|
---|
107 | status=rt_heap_free(&heap,mem_segment);
|
---|
108 | if(status!=0)
|
---|
109 | {
|
---|
110 | self->Err("rt_heap_free error (%s)\n",strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
111 | }
|
---|
112 | */
|
---|
113 |
|
---|
114 | if (heap_binded == false) {
|
---|
115 | status = rt_heap_delete(&heap);
|
---|
116 | if (status != 0) {
|
---|
117 | self->Err("rt_heap_delete error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
118 | }
|
---|
119 | }
|
---|
120 |
|
---|
121 | if (mutex_binded == false) {
|
---|
122 | status = rt_mutex_delete(&mutex);
|
---|
123 | if (status != 0) {
|
---|
124 | self->Err("error destroying mutex (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
125 | }
|
---|
126 | }
|
---|
127 | #else
|
---|
128 | status = munmap(mem_segment, size);
|
---|
129 | if (status != 0) {
|
---|
130 | self->Err("Failed to unmap memory (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
131 | }
|
---|
132 |
|
---|
133 | status = close(fd);
|
---|
134 | if (status != 0) {
|
---|
135 | self->Err("Failed to close file (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
136 | }
|
---|
137 |
|
---|
138 | // do not check errors as it can be done by another process
|
---|
139 | status = shm_unlink(shm_name.c_str()); /*
|
---|
140 | if(status!=0)
|
---|
141 | {
|
---|
142 | self->Err("Failed to unlink memory (%s)\n",strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
143 | }
|
---|
144 | */
|
---|
145 | // do not check errors as it can be done by another process
|
---|
146 | if (type==SharedMem::Type::mutex) {
|
---|
147 | status = sem_unlink(sem_name.c_str());
|
---|
148 | status = sem_close(sem);
|
---|
149 | if (status != 0) {
|
---|
150 | self->Err("Failed to close mutex semaphore (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
151 | }
|
---|
152 | } else if (type==SharedMem::Type::producerConsumer) {
|
---|
153 | status = sem_unlink(sem_name_producer.c_str());
|
---|
154 | status = sem_close(sem_producer);
|
---|
155 | if (status != 0) {
|
---|
156 | self->Err("Failed to close producer semaphore (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
157 | }
|
---|
158 | status = sem_unlink(sem_name_consumer.c_str());
|
---|
159 | status = sem_close(sem_consumer);
|
---|
160 | if (status != 0) {
|
---|
161 | self->Err("Failed to close consumer semaphore (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
162 | }
|
---|
163 | }
|
---|
164 | #endif
|
---|
165 | }
|
---|
166 |
|
---|
167 | void SharedMem_impl::ReaderReady() {
|
---|
168 | #ifdef __XENO__
|
---|
169 | //TODO
|
---|
170 | #else
|
---|
171 | sem_post(sem_consumer);
|
---|
172 | #endif
|
---|
173 | }
|
---|
174 |
|
---|
175 | void SharedMem_impl::Write(const char *buf, size_t size) {
|
---|
176 | #ifdef __XENO__
|
---|
177 | int status = rt_mutex_acquire(&mutex, TM_INFINITE);
|
---|
178 | if (status != 0) {
|
---|
179 | char errorMsg[256];
|
---|
180 | self->Err("error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
181 | }
|
---|
182 | memcpy(mem_segment, buf, size);
|
---|
183 | status = rt_mutex_release(&mutex);
|
---|
184 | if (status != 0) {
|
---|
185 | char errorMsg[256];
|
---|
186 | self->Err("error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
187 | }
|
---|
188 | #else
|
---|
189 | if (type==SharedMem::Type::mutex) {
|
---|
190 | sem_wait(sem);
|
---|
191 | memcpy(mem_segment, buf, size);
|
---|
192 | sem_post(sem);
|
---|
193 | } else if (type==SharedMem::Type::producerConsumer) {
|
---|
194 | //wait until consumer took the data away before writting a new one
|
---|
195 | //but should not block if nobody's there to read
|
---|
196 | if (sem_trywait(sem_consumer)==0) {
|
---|
197 | memcpy(mem_segment, buf, size);
|
---|
198 | sem_post(sem_producer);
|
---|
199 | }
|
---|
200 | }
|
---|
201 | #endif
|
---|
202 | }
|
---|
203 |
|
---|
204 | void SharedMem_impl::Read(char *buf, size_t size) {
|
---|
205 | #ifdef __XENO__
|
---|
206 | int status = rt_mutex_acquire(&mutex, TM_INFINITE);
|
---|
207 | if (status != 0) {
|
---|
208 | char errorMsg[256];
|
---|
209 | self->Err("error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
210 | }
|
---|
211 | memcpy(buf, mem_segment, size);
|
---|
212 | status = rt_mutex_release(&mutex);
|
---|
213 | if (status != 0) {
|
---|
214 | char errorMsg[256];
|
---|
215 | self->Err("error (%s)\n", strerror_r(-status, errorMsg, sizeof(errorMsg)));
|
---|
216 | }
|
---|
217 | #else
|
---|
218 | if (type==SharedMem::Type::mutex) {
|
---|
219 | sem_wait(sem);
|
---|
220 | memcpy(buf, mem_segment, size);
|
---|
221 | sem_post(sem);
|
---|
222 | } else if (type==SharedMem::Type::producerConsumer) {
|
---|
223 | sem_wait(sem_producer); //wait until some data is available
|
---|
224 | memcpy(buf, mem_segment, size);
|
---|
225 | sem_post(sem_consumer);
|
---|
226 | }
|
---|
227 | #endif
|
---|
228 | }
|
---|