dear gurus man mutex(9) states that:
"No mutexes should be held (except for Giant) across functions which access memory in userspace, such as copyin(9), copyout(9), uiomove(9), fuword(9), etc. No locks are needed when calling these functions." can someone pls. explain why it is so? Suppose I have a kernel buffer to which kernel writes and userland processes read via a character device. In the device read method, If we unlock the mutex just before uiomove, is it guaranteed that kernel does not write to the buffer in the middle of uiomove? If yes, how? What is the solution in such a situation? rwlocks? an intermediate buffer? -- Best regards. Hooman Fazaeli _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "[email protected]"
