// boosttest.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <boost/lexical_cast.hpp>
#include <iostream>
#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/mapped_region.hpp>
using
namespace
std;
using
namespace boost::interprocess;
int main(int argc,char *argv[])
{
cout <<
"argc" << argc<<argv[
0];
if (argc ==
1) {
//父进程
//1 删除共享内存
struct shm_remove
{
shm_remove() { shared_memory_object::remove(
"SharedMemory"); }
~shm_remove() { shared_memory_object::remove(
"SharedMemory"); }
}remover;
//2 创建共享内存段
shared_memory_object shm(create_only, "SharedMemory", read_write);
//3 设置共享内存大小
shm.truncate(
100);
//4 映射共享内存片段
mapped_region region(shm, read_write);
//5 初始化为1
std::
memset(region.get_address(),
1, region.get_size());
//运行子进程
std::string s(argv[0]);
s +=
" child ";
if (
0 !=
std::system(s.c_str()))
return
1;
}
else
{
//1 创建共享内存
shared_memory_object shm(open_only,
"SharedMemory", read_only);
//2 映射共享内存
mapped_region region(shm, read_only);
//3 检查共享内存是否被初始化为1
char* mem =
static_cast<
char*>(region.get_address());
for (
std::
size_t i =
0; i < region.get_size(); ++i) {
if (*mem++ !=
1)
return
1;
else
{
printf(
"mem:%d ", *mem);
}
}
}
system(
"pause");
return
0;
}
// boosttest.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <boost/lexical_cast.hpp>
#include <iostream>
#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/mapped_region.hpp>
#include <boost/interprocess/ipc/message_queue.hpp>
#include <vector>
using
namespace
std;
using
namespace boost::interprocess;
int main(int argc,char *argv[])
{
cout <<
"argc" << argc<<argv[
0];
if (argc ==
1) {
//父进程
//1 删除消息队列
message_queue::remove(
"message_queue");
//2 创建消息队列
message_queue mq(create_only, "message_queue", 100, sizeof(int));
//3 发送100个数字
for (
int i =
0; i <
100; ++i) {
mq.send(&i,
sizeof(i),
0);
}
//运行子进程
std::string s(argv[0]);
s +=
" child ";
if (
0 !=
std::system(s.c_str()))
return
1;
}
else
{
//1 打开消息队列
message_queue mq(open_only,
"message_queue");
unsigned
int priority;
message_queue::size_type recvd_size;
for (
int i =
0; i <
100; i++)
{
int number;
mq.receive(&number,
sizeof(number),recvd_size,priority);
if (number != i || recvd_size !=
sizeof(number))
return
1;
else
printf(
"number:%d ", number);
}
message_queue::remove(
"message_queue");
}
system(
"pause");
return
0;
}
// boosttest.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
// boosttest.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <boost/lexical_cast.hpp>
#include <iostream>
#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/mapped_region.hpp>
#include <boost/interprocess/sync/interprocess_semaphore.hpp>
using
namespace
std;
using
namespace boost::interprocess;
struct shared_memory_buffer
{
enum { NumItems =
100};
//数组大小
shared_memory_buffer():mutex(
1),nempty(NumItems),nstored(
0){}
interprocess_semaphore mutex, nempty, nstored;
//匿名信号量
int items[NumItems];
//共享数组
};
int main(int argc, char *argv[])
{
//cout << "argc" << argc << argv[0];
if (argc ==
1) {
//父进程
//1 删除共享内存
struct shm_remove
{
shm_remove() { shared_memory_object::remove(
"SharedMemory"); }
}remover;
//2 创建共享内存段
shared_memory_object shm(create_only, "SharedMemory", read_write);
//3 设置共享内存大小
shm.truncate(
sizeof(shared_memory_buffer));
//4 映射共享内存片段
mapped_region region(shm, read_write);
//5 写数据,数据满了会阻塞
void *addr = region.get_address();
shared_memory_buffer *data =
new(addr)shared_memory_buffer;
const
int NumMsg =
100;
for (
int i =
0; i < NumMsg; ++i) {
data->nempty.wait();
data->mutex.wait();
data->items[i%shared_memory_buffer::NumItems] = i;
data->mutex.post();
data->nstored.post();
}
}
else
{
struct shm_remove
{
~shm_remove() { shared_memory_object::remove(
"MySharedMemory"); }
} remover;
//1 创建共享内存
shared_memory_object shm(open_only, "SharedMemory", read_write);
//2 映射共享内存
mapped_region region(shm, read_write);
//3 共享数据复制到自己的缓冲
void * addr = region.get_address();
shared_memory_buffer* data =
static_cast<shared_memory_buffer*>(addr);
const
int NumMsg =
100;
int extracted_data[NumMsg];
for (
int i =
0; i < NumMsg; ++i) {
data->nstored.wait();
data->mutex.wait();
extracted_data[i] = data->items[i%shared_memory_buffer::NumItems];
printf(
"data:%d ", data->items[i%shared_memory_buffer::NumItems]);
data->mutex.post();
data->nempty.post();
}
}
system(
"pause");
return
0;
}
信号量与互斥锁的区别: 1,作用域 信号量: 进程间或线程间(linux仅线程间) 互斥锁: 线程间 2,上锁时 信号量: 只要信号量的value大于0,其他线程就可以wait成功,成功后信号量的value减一。若value值不大于0,则wait阻塞,直到post释放后value值加一 互斥锁: 只要被锁住,其他任何线程都不可以访问被保护的资源