msync is not supposed to have anything to do with whether the changes are committed to the logical state of the file, or whether other processes using mmap or read to access the file see …

2013年4月6日 · On at least one system, man msync says: The msync() system call writes modified whole pages back to the filesystem and updates the file modification time. Only those …

2017年10月19日 · On Linux msync(MS_ASYNC) is a no-op (see the VERSIONS section of the msync() man page). On other OSes it may do something and of course you can call msync() …

2023年1月13日 · It does the same stuff basicly, while msync ensures that any changes made to the memory-mapped region are written to the storage device. fsync ensures that any changes …

2020年2月12日 · Linux version: 4.19 Platform: Xilinx Ultrascale+ Zynq In the programmable logic I've created a memory mapped device located at physical address 0xA0001000. I'm using …

Actually, msync is largely a no-op on Linux or any system with a proper virtual memory and page cache system; read will immediately see anything written to the mmapped pages, even without …

2009年3月6日 · When I read the man page for msync, I would not assume that it is actually flushing the disk cache (the cache in the disk unit, as opposed to the system cache in main …

2011年6月9日 · The msync man page states: ENOMEM The indicated memory (or part of it) was not mapped. That's the errno value perror() prints for you. So you're somehow trying to …

I'm currently using OpenLDAP Symas MDB as a persistent key/value storage and without MDB_MAPASYNC - which results in using msync(MS_ASYNC) (I looked through the source …

2015年7月21日 · Changes are not dropped if msync() was not called before close()/munmap(). MS_ASYNC is a no-op. MS_SYNC is just like fsync(). In Linux, msync() is just another …