我正在尝试使用Boost库1.55.0创建共享内存。我有一个example.cpp文件来创建Boost共享内存。该文件的混合成功，但是在调试“ MATLAB.exe触发了断点”时引发了以下异常。是由于boost版本与matlab版本不兼容，导致此异常吗？如何解决这个问题
`/ *文件：sfun_counter_cpp.cpp
*摘要：
*
*将C ++对象存储在
中的C ++ S函数示例
*指针向量PWork。
*
*版权所有1990-2000 The MathWorks，Inc.
*
#include "iostream"
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/containers/vector.hpp>
#include <boost/interprocess/allocators/allocator.hpp>
typedef struct
{
int outGate;
unsigned int outPin;
int inGate;
unsigned int inPin;
} wire;
typedef struct
{
unsigned int gateType;
unsigned int inPins;
unsigned int outPins;
std::vector<wire> inWires;
std::vector<wire> outWires;
} gate;
std::vector<gate> gates;
wire wiredata;
gate gatedata;
class counter {
double x;
public:
counter() {
x = 0.0;
}
double output(void) {
x = x + 1.0;
return x;
}
};
#ifdef __cplusplus
extern "C" { // use the C fcn-call standard for all functions
#endif // defined within this scope
#define S_FUNCTION_LEVEL 2
#define S_FUNCTION_NAME sfun_counter_cpp
/*
* Need to include simstruc.h for the definition of the SimStruct and
* its associated macro definitions.
*/
#include "simstruc.h"
/*====================*
* S-function methods *
*====================*/
/* Function: mdlInitializeSizes ===============================================
* Abstract:
* The sizes information is used by Simulink to determine the S-function
* block's characteristics (number of inputs, outputs, states, etc.).
*/
static void mdlInitializeSizes(SimStruct *S)
{
/* See sfuntmpl_doc.c for more details on the macros below */
ssSetNumSFcnParams(S, 1); /* Number of expected parameters */
if (ssGetNumSFcnParams(S) != ssGetSFcnParamsCount(S)) {
/* Return if number of expected != number of actual parameters */
return;
}
ssSetNumContStates(S, 0);
ssSetNumDiscStates(S, 0);
if (!ssSetNumInputPorts(S, 0)) return;
if (!ssSetNumOutputPorts(S, 1)) return;
ssSetOutputPortWidth(S, 0, 1);
ssSetNumSampleTimes(S, 1);
ssSetNumRWork(S, 0);
ssSetNumIWork(S, 0);
ssSetNumPWork(S, 1); // reserve element in the pointers vector
ssSetNumModes(S, 0); // to store a C++ object
ssSetNumNonsampledZCs(S, 0);
ssSetOptions(S, 0);
}
/* Function: mdlInitializeSampleTimes
=========================================
* Abstract:
* This function is used to specify the sample time(s) for your
* S-function. You must register the same number of sample times as
* specified in ssSetNumSampleTimes.
*/
static void mdlInitializeSampleTimes(SimStruct *S)
{
ssSetSampleTime(S, 0, mxGetScalar(ssGetSFcnParam(S, 0)));
ssSetOffsetTime(S, 0, 0.0);
}
#define MDL_START /* Change to #undef to remove function */
#if defined(MDL_START)
/* Function: mdlStart
=======================================================
* Abstract:
* This function is called once at start of model execution. If you
* have states that should be initialized once, this is the place
* to do it.
*/
static void mdlStart(SimStruct *S)
{
ssGetPWork(S)[0] = (void *) new counter; // store new C++ object in
the
} // pointers vector
#endif /* MDL_START */
/* Function: mdlOutputs =======================================================
* Abstract:
* In this function, you compute the outputs of your S-function
* block. Generally outputs are placed in the output vector, ssGetY(S).
*/
static void mdlOutputs(SimStruct *S, int_T tid)
{
using namespace boost::interprocess;
counter *c = (counter *) ssGetPWork(S)[0]; // retrieve C++ object from
shared_memory_object::remove("MySharedMemory");
//create the shared memory
managed_shared_memory segment(create_only, "MySharedMemory", 65536);
//create the allocators for the struct elements to be accessed as
vectors
typedef allocator<gate,
managed_shared_memory::segment_manager>gate_alloc;
typedef allocator<wire,
managed_shared_memory::segment_manager>inwire_alloc;
typedef allocator<wire,
managed_shared_memory::segment_manager>outwire_alloc;
//create a boost vector with an associated allocator to it
typedef vector<gate, gate_alloc>gate_vec;
typedef vector<wire, inwire_alloc>inwire_vec;
typedef vector<wire, outwire_alloc>outwire_vec;
//Initialize shared memory STL-compatible allocator
const gate_alloc alloc_inst(segment.get_segment_manager());
const inwire_alloc alloc_inst1(segment.get_segment_manager());
const outwire_alloc alloc_inst2(segment.get_segment_manager());
//construct the segment for pushing the data into it
gate_vec *gate_data = segment.construct<gate_vec>("gatedata")
(alloc_inst);
inwire_vec *inwire_data = segment.construct<inwire_vec>("inwiredata")
(alloc_inst1);
outwire_vec *outwire_data = segment.construct<outwire_vec>
("outwiredata")
(alloc_inst2);
//push the data into the vectors
wiredata.inGate = 10;
wiredata.inPin = 2;
wiredata.outGate = 1;
wiredata.outPin = 3;
inwire_data->push_back(wiredata);
outwire_data->push_back(wiredata);
gatedata.gateType = 1;
gatedata.inPins = 2;
gatedata.outPins = 3;
gate_data->push_back(gatedata);
real_T *y = ssGetOutputPortRealSignal(S,0); // the pointers vector
and use
y[0] = c->output(); // member functions of
the
} // object
/* Function: mdlTerminate
=====================================================
* Abstract:
* In this function, you should perform any actions that are necessary
* at the termination of a simulation. For example, if memory was
* allocated in mdlStart, this is the place to free it.
*/
static void mdlTerminate(SimStruct *S)
{
counter *c = (counter *) ssGetPWork(S)[0]; // retrieve and destroy C++
delete c; // object in the
termination
} // function
/*======================================================*
* See sfuntmpl_doc.c for the optional S-function methods *
*======================================================*/
/*=============================*
* Required S-function trailer *
*=============================*/
#ifdef MATLAB_MEX_FILE /* Is this file being compiled as a MEX-file?*/
#include "simulink.c" /* MEX-file interface mechanism */
#else
#include "cg_sfun.h" /* Code generation registration function */
#endif
#ifdef __cplusplus
} // end of extern "C" scope
#endif
` 这是我必须混合，调试和运行的功能。尽管上述代码片段的混合成功，但在调试时会引发异常“ MATLAB.exe触发了断点”。
答案 0 :(得分：1)
我可以举一个例子。不幸的是，我无法在Windows上对其进行测试，但已在UNIX系统上对其进行了测试。主要思想是相同的。在这种情况下，它是从外部二进制文件到Matlab mex函数的共享内存。
外部二进制文件是：
#include <cstring>
#include <string>
#include <cstdlib>
#include <iostream>
#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/mapped_region.hpp>
using namespace boost::interprocess;
const std::string payload("SHARED MEMORY CONTENT");
int main(void) {
shared_memory_object shm(open_or_create, "memory4mat" ,read_write);
shm.truncate(payload.size());
mapped_region mem(shm, read_write);
std::memcpy(mem.get_address(), payload.c_str(), mem.get_size());
do {
std::cout << '\n' << "Press a key to continue...";
} while (std::cin.get() != '\n');
shared_memory_object::remove("memory4mat");
return 0;
}
mex函数为：
#include "mex.hpp"
#include "mexAdapter.hpp"
#include "MatlabDataArray.hpp"
#include <string>
#include <cstdlib>
#include "boost/interprocess/shared_memory_object.hpp"
#include "boost/interprocess/mapped_region.hpp"
using namespace boost::interprocess;
class MexFunction : public matlab::mex::Function {
public:
void operator()(matlab::mex::ArgumentList outputs, matlab::mex::ArgumentList inputs) {
matlab::data::ArrayFactory factory;
shared_memory_object shm(open_only, "memory4mat", read_only);
mapped_region mem(shm, read_only);
std::string payload(static_cast<const char *>(mem.get_address()), mem.get_size());
outputs[0] = factory.createCharArray(payload);
outputs[1] = factory.createScalar<int16_t>(mem.get_size());
}
};
它使用C++ Interface and Data API for Matlab。要编译这两个示例，您需要添加boost include目录作为编译器选项（共享内存是boost中的仅标头功能）。
外部二进制文件create a shared memory包含字符串"SHARED MEMORY CONTENT"，并等待用户的回车以删除共享内存对象。
mex文件会打开共享内存（如果存在）（如果共享内存不存在，则在Matlab中报告并处理错误，这是我偏爱C ++ api的原因之一），然后将其内容复制到Matlab char数组中。该函数返回两个值，第一个是共享内存的内容，第二个是共享内存的长度（映射器使用所有内存，并通过truncate设置）。
这个简单的示例仅使用基本功能，并且可以在Unix和Windows系统上运行，但是我仍然无法在win上进行测试。
让我们尝试一个有关共享内存和Matlab Mex文件的更完整示例。让我们编写一个非常简单的外部二进制文件，使我们可以创建/删除/读取/写入共享内存。为了简化起见，该二进制文件中有很多东西经过了硬编码，例如存储文件的名称（"shmem"）：
// File: share_server.cpp
// g++ share_server.cpp -o share_server
#include <cstring>
#include <string>
#include <cstdlib>
#include <iostream>
#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/mapped_region.hpp>
using namespace boost::interprocess;
static const std::size_t size = 20;
static const std::size_t wsize = 15;
static const char name[6] = "shmem";
static const char input[wsize] = "write in share";
char output[size];
inline void printHelp() {
std::cout << "Options:" << std::endl;
std::cout << " n) open a new 'shmem' memory" << std::endl;
std::cout << " d) delete a 'shmem' memory" << std::endl;
std::cout << " r) read from 'shmem' memory" << std::endl;
std::cout << " w) write to 'shmem' memory" << std::endl;
std::cout << " x) Exit" << std::endl;
}
inline void cmd_createShare() {
try {
shared_memory_object sm(create_only, name, read_write);
sm.truncate(size);
std::cout << "Shared object created" << std::endl;
} catch(std::exception & e) {
std::cout << "Create Error :: " << e.what() << std::endl;
}
}
inline void cmd_deleteShare() {
try {
shared_memory_object::remove(name);
std::cout << "Shared object deletetd" << std::endl;
} catch(std::exception & e) {
std::cout << "Delete Error:: " << e.what() << std::endl;
}
}
inline void cmd_readShare() {
try {
shared_memory_object sm(open_only, name, read_only);
mapped_region sh_mem(sm, read_only);
std::string ret(static_cast<const char *>(sh_mem.get_address()), sh_mem.get_size());
std::cout << ret << std::endl;
} catch(std::exception & e) {
std::cout << "Read Error:: " << e.what() << std::endl;
}
}
inline void cmd_writeShare() {
try {
shared_memory_object sm(open_only, name, read_write);
mapped_region sh_mem(sm, read_write);
std::memcpy(sh_mem.get_address(), input, wsize);
std::cout << "Write completed" << std::endl;
} catch(std::exception & e) {
std::cout << "Read Error:: " << e.what() << std::endl;
}
}
我们可以编写3个mex文件（使用C ++ API）以便与共享内存进行交互。第一个，最简单的一个，它以字符串的形式读取共享内存的内容，并将其返回到Matlab工作区。 Matlab语法中的界面类似于：
function [value, read_size] = read_share(share_name)
...
end
，C ++实现如下：
// File: read_share.cpp
#include "mex.hpp"
#include "mexAdapter.hpp"
#include "MatlabDataArray.hpp"
#include <string>
#include <cstring>
#include <cstdlib>
#include <vector>
#include <exception>
#include "boost/interprocess/shared_memory_object.hpp"
#include "boost/interprocess/mapped_region.hpp"
using namespace boost::interprocess;
using namespace matlab::data;
class MexFunction : public matlab::mex::Function {
private:
std::shared_ptr<matlab::engine::MATLABEngine> engine;
ArrayFactory factory;
void throwError(std::string errorMessage) {
engine->feval(matlab::engine::convertUTF8StringToUTF16String("error"),
0, std::vector<Array>({ factory.createScalar(errorMessage) }));
}
uint64_t read_shared_memory(const std::string & name, std::string & ret_value) {
try {
shared_memory_object sm(open_only, name.c_str(), read_only);
mapped_region sh_mem(sm, read_only);
ret_value += std::string(static_cast<const char *>(sh_mem.get_address()), sh_mem.get_size());
return ret_value.size();
} catch(std::exception & e) {
throwError(std::string("Reading error: ") + std::string(e.what()));
}
return 0;
}
void checkArguments(matlab::mex::ArgumentList inputs, matlab::mex::ArgumentList outputs) {
if (inputs.size() != 1)
throwError("Input must be of size 1");
if (inputs[0].getType() != ArrayType::CHAR)
throwError("First element must be a matlab char array");
if (outputs.size() > 2)
throwError("Too many outputs (required 1)");
}
public:
MexFunction() {
engine = getEngine();
}
void operator()(matlab::mex::ArgumentList outputs, matlab::mex::ArgumentList inputs) {
checkArguments(inputs, outputs);
const CharArray name_array = std::move(inputs[0]);
std::string name = name_array.toAscii();
std::string ret_string("");
uint64_t ret_size = read_shared_memory(name, ret_string);
outputs[0] = factory.createScalar(ret_string);
outputs[1] = factory.createScalar<uint64_t>(ret_size);
}
};
第二个mex文件是写操作。它需要两个输入：共享内存的名称和要在内存中写入的字符串。 mex检查共享内存的最大大小，并且存储的空间不超过可用空间。该函数返回写入的字节。write函数的接口类似于：
function written_size = write_share(share_name, string)
...
end
，实现是：
// File: write_share.cpp
#include "mex.hpp"
#include "mexAdapter.hpp"
#include "MatlabDataArray.hpp"
#include <string>
#include <algorithm>
#include <cstring>
#include <cstdlib>
#include <exception>
#include "boost/interprocess/shared_memory_object.hpp"
#include "boost/interprocess/mapped_region.hpp"
using namespace boost::interprocess;
using namespace matlab::data;
class MexFunction : public matlab::mex::Function {
private:
std::shared_ptr<matlab::engine::MATLABEngine> engine;
ArrayFactory factory;
void throwError(std::string errorMessage) {
engine->feval(matlab::engine::convertUTF8StringToUTF16String("error"),
0, std::vector<Array>({ factory.createScalar(errorMessage) }));
}
uint64_t write_shared_memory(const std::string & name, const std::string & value) {
try {
shared_memory_object sm(open_only, name.c_str(), read_write);
mapped_region sh_mem(sm, read_write);
uint64_t size = std::min(value.size(), sh_mem.get_size());
std::memcpy(sh_mem.get_address(), value.c_str(), size);
return size;
} catch(std::exception & e) {
throwError(std::string("Reading error: ") + std::string(e.what()));
}
return 0;
}
void checkArguments(matlab::mex::ArgumentList inputs, matlab::mex::ArgumentList outputs) {
if (inputs.size() != 2)
throwError("Input must be of size 2");
if (inputs[0].getType() != ArrayType::CHAR)
throwError("First element must be a matlab char array");
if (inputs[1].getType() != ArrayType::CHAR)
throwError("Second element must be a matlab char array to save");
if (outputs.size() > 1)
throwError("Too many outputs (required 1)");
}
public:
MexFunction() {
engine = getEngine();
}
void operator()(matlab::mex::ArgumentList outputs, matlab::mex::ArgumentList inputs) {
checkArguments(inputs, outputs);
const CharArray name_array = std::move(inputs[0]);
std::string name = name_array.toAscii();
const CharArray value_array = std::move(inputs[1]);
std::string value = value_array.toAscii();
uint64_t written = write_shared_memory(name, value);
outputs[0] = factory.createScalar<uint64_t>(written);
}
};
最后一个mex最复杂，它处理共享内存的创建和删除。您会注意到存在析构函数，该析构函数可以在从Matlab卸载mex时处理共享内存的删除。接口采用"create"或"delete"形式的命令，该字符串包含要创建的共享名称和共享内存的大小（必须为unsigned int-{{1} }。该函数返回共享内存的大小（应该等于大小）：
uint16(...)实现如下：
function size_shmem = menage_mex(command, share_name, uint16(size))
...
end
要编译mex，可以使用以下脚本：
// File: menage_share.cpp
#include "mex.hpp"
#include "mexAdapter.hpp"
#include "MatlabDataArray.hpp"
#include <string>
#include <cstring>
#include <cstdlib>
#include <vector>
#include <exception>
#include "boost/interprocess/shared_memory_object.hpp"
#include "boost/interprocess/mapped_region.hpp"
using namespace boost::interprocess;
using namespace matlab::data;
class MexFunction : public matlab::mex::Function {
private:
std::shared_ptr<matlab::engine::MATLABEngine> engine;
ArrayFactory factory;
std::vector<std::string> pool;
void throwError(std::string errorMessage) {
engine->feval(matlab::engine::convertUTF8StringToUTF16String("error"),
0, std::vector<Array>({ factory.createScalar(errorMessage) }));
}
uint64_t run_command(const std::string & cmd, const std::string & name, uint64_t size) {
if (cmd == "create")
return create_shared_memory(name, size);
if (cmd == "delete")
return delete_shared_memory(name, size);
throwError("The command is unknown");
return 0;
}
uint64_t create_shared_memory(const std::string & name, uint64_t size) {
bool in_pool = false;
for (const auto & el : pool) {
if (el == name) {
in_pool = true;
break;
}
}
if (in_pool) {
try {
shared_memory_object sm(open_only, name.c_str(), read_only);
mapped_region sm_reg(sm, read_only);
if (sm_reg.get_size() != size)
throwError("Memory already exist and it is of different size");
return 0;
} catch (std::exception & e) {
throwError(std::string("Cannot open existing shared memory (maybe already open?) :: ") + std::string(e.what()));
}
} else {
try {
shared_memory_object sm(create_only, name.c_str(), read_write);
sm.truncate(size);
pool.push_back(name);
return size;
} catch (std::exception & e) {
throwError(std::string("Cannot create shared memory [" + name + "] (maybe already open?) :: ") + std::string(e.what()));
}
}
return 0;
}
uint64_t delete_shared_memory(const std::string & name, uint64_t size) {
std::size_t in_pool = 0;
for (const auto & el : pool) {
if (el == name)
break;
in_pool++;
}
if (in_pool < pool.size()) {
shared_memory_object::remove(name.c_str());
pool.erase(pool.begin() + in_pool);
} else {
throwError("Shared memory [" + name + "] is not handled by this mex");
}
return 0;
}
void checkArguments(matlab::mex::ArgumentList inputs, matlab::mex::ArgumentList outputs) {
if (inputs.size() != 3)
throwError("Input must be of size 3");
if (inputs[0].getType() != ArrayType::CHAR)
throwError("First element must be a matlab char array");
if (inputs[1].getType() != ArrayType::CHAR)
throwError("Second element must be amatlab char array");
if (inputs[2].getType() != ArrayType::UINT64)
throwError("Third element must be a single uint64 integer");
if (outputs.size() > 1)
throwError("Too many outputs (required 1)");
}
void inputArguments(std::string & cmd, std::string & name, uint64_t & size, matlab::mex::ArgumentList inputs) {
const CharArray cmd_array = std::move(inputs[0]);
const CharArray name_array = std::move(inputs[1]);
const TypedArray<uint64_t> size_array = std::move(inputs[2]);
cmd = cmd_array.toAscii();
name = name_array.toAscii();
size = size_array[0];
}
public:
MexFunction() {
pool.clear();
engine = getEngine();
}
~MexFunction() {
for (const auto & el : pool) {
shared_memory_object::remove(el.c_str());
}
}
void operator()(matlab::mex::ArgumentList outputs, matlab::mex::ArgumentList inputs) {
checkArguments(inputs, outputs);
std::string cmd, name;
uint64_t size;
inputArguments(cmd, name, size, inputs);
uint64_t ret = run_command(cmd, name, size);
outputs[0] = factory.createScalar<uint64_t>(ret);
}
};
，您可以对其进行如下测试：
MEX_OPT = ['-I', '/path/to/boost'];
MEX_SRC = { ...
'menage_share.cpp', ...
'read_share.cpp', ...
'write_share.cpp' ...
};
for i = 1:length(MEX_SRC)
mex(MEX_OPT, MEX_SRC{i});
end
!g++ share_server.cpp -o share_server