CreateFileMapping用于在win32中创建共享内存
CreateFileMapping用于在win32中创建共享内存。是否需要同步共享内存读/写或者它是自动完成的？
CreateFileMapping is used to create shared memory in win32. Do need to synchronized shared memory read/write or it is done automatically ?
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您的问题不清楚是否将其用于线程或进程之间的共享内存，因此请确定：对于不需要文件映射的线程，单个进程中的所有内存对所有线程都是可见的（并且需要同步） 。
要将其用于进程之间的共享内存：是的，您必须显式同步对其的访问，因为系统无法知道对其进行的连续写入是否应分组为单个事务。提示：要同步它们，您不能使用临界区（它们仅适用于进程内的线程），您可以使用：
http://msdn.microsoft.com/en-us/library/aa904937%28v=VS.85%29.aspx
Your question was not clear about whether you use this for shared memory between threads or processes, so just to be sure: for threads you dont need a file-mapping, all memory in a single process is visible to all threads (and needs sync).
To use it for shared memory between processes: yes you have to sync accesses to it explicitly because the system can not know whether consecutive writes to it are meant to be grouped as a single transaction or not. Tip to do this: To sync them you can not use criticalsections (they only work for threads within a process), you could use:
http://msdn.microsoft.com/en-us/library/aa904937%28v=VS.85%29.aspx