如何修改共享内存（shmget的/的shmat）用C？ [英] How to modify shared memory (shmget/shmat) in C?

问题描述

我有一个结构：

struct sdata {
    int x;
    int y;
    time_t time;
};

我创建的结构共享内存如下：

I create shared memory for the struct as follows:

size_t shmsize = sizeof(struct sdata);
shmid = shmget(IPC_PRIVATE, shmsize, IPC_CREAT | 0666);

然后我访问共享内存是这样的：

Then I access the shared memory like this:

struct sdata *data = shmat(shared.shmid, (void *) 0, 0);
data->time = time(NULL); // function returns the current time

我的问题是pretty简单。这是访问/修改共享内存的正确方法？这是最好的办法？

My question is pretty simple. Is this the right way to access/modify shared memory? Is this the best approach?

（我使用的同步System V信号，我还没有列入该code，我只是想确认我访问/修改正确的共享内存）。

(I am using System V semaphores for synchronization and I haven't included that code. I just wanted to make sure I am accessing/modifying the shared memory correctly.)

推荐答案

这是正确的，需要注意的唯一的事情就是你正在创建一个私人共享内存段，这意味着你必须以某种方式传输的shmid任何你希望其他进程具有使用它。

This is correct, the only thing of note is that you are creating a PRIVATE shared memory segment, which means you'll have to transmit the shmid somehow to any other process that you want to have use it.

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