As the example above, region writes the number 99 to the beginning of the shared memory. region2 the reads the same location in shared memory and writes the number to the standard ouptu stream. Even though regio
#include <cstdlib> // 定义共享内存的名称和大小 const char* SharedMemoryName = "SharedMemoryExample"; const std::size_t SharedMemorySize = 1024; int main(int argc, char* argv[]) { using namespace boost::interprocess; // 创建或打开共享内存对象 shared_memory_object shm(argc > ...
You can just allocate a portion of a shared memory segment, copy the message to that buffer, send the offset of that portion of shared memory to another process, and you are done. Let's see the example: (在共享内存中分配一部分buffer,并将消息复制到这块buffer中,然后将这部分共享内存的offset...
1.shared_ptr 解析:shared_ptr是一种计数指针,当引用计数变为0时,shared_ptr所指向的对象将会被删除。如下所示: voidtest() { shared_ptr p1(new int); // 计数为1 { shared_ptr p2(p1); // 计数为2 { shared_ptr p2(p1); // 计数为3 } // 计数为2 } // 计数为1 } // 计数为0,同时i...
1.shared_ptr解析:shared_ptr是一种计数指针,当引用计数变为0时,shared_ptr所指向的对象将会被删除。如下所示: void test() { shared_ptr p1(new int); // 计数为1 { shared_ptr p2(p1); // 计数为2 { shared_ptr p2(p1); // 计数为3 } // 计数为2 } // 计数为1 } // 计数为0,同时...
问“managed_shared_memory”应该分配多少内存？(boost)EN你不能计算它，因为在运行时会根据你的分配/...
#include<boost/iostreams/device/mapped_file.hpp>#include<iostream>intmain(){// 创建一个内存映射文件对象,并指定文件路径和打开模式boost::iostreams::mapped_filefile("example.txt",boost::iostreams::mapped_file::readwrite);// 获取文件的大小std::size_t file_size=file.size();// 将文件内容映射到...
The class that allows this complex structures in shared memory is calledboost::interprocess::managed_shared_memoryand it's easy to use. Just execute this example without arguments: 允许在共享内存创建复杂结构的类是boost::interprocess::managed_shared_memory, 它很容易使用,只需不带参数执行这个例子: ...
编译:[root@localhostboost_1_46_0]#c++ -I /usr/local/boost_1_46_0 example.cpp -o example 运行:[root@localhostboost_1_46_0]#echo 1 2 3 | ./example 显示结果; 3 6 9 4、Separately-Compiled的编译,需要用到bjam(boost jam),这是专门为boost开发的编译工具。
The second conveyed that there was significant COVID-19 transmission in the patient’s county, and if infection rates in the patient’s county were in the top 50% of US counties, these reminders also conveyed the exact infection decile (for example, ‘infection rates are in the top 20% ...