ibv_fork_init()
initializes libibverbs's data structures to handle
fork()
function calls correctly and avoid data corruption, whether
fork()
is called explicitly or implicitly (such as in
system()).
It is not necessary to use this function if all parent process threads
are always blocked until all child processes end or change address
spaces via an
exec()
operation.
RETURN VALUE
ibv_fork_init()
returns 0 on success, or the value of errno on failure (which indicates the failure reason).
NOTES
ibv_fork_init()
works on Linux kernels supporting the
MADV_DONTFORK
flag for
madvise()
(2.6.17 and higher).
Setting the environment variable
RDMAV_FORK_SAFE
or
IBV_FORK_SAFE
has the same effect as calling
ibv_fork_init().
Calling
ibv_fork_init()
will reduce performance due to an extra system call for every memory
registration, and the additional memory allocated to track memory
regions. The precise performance impact depends on the workload and
usually will not be significant.