Correclty check for Windows 8 version (6.2), in case this code
path gets re-enabled again.
Note that Windows 10 has version number 10.0, so it would finally
take the code path originally intended for Windows 8 and higher.
VirtualProtect is failing with ERROR_INVALID_PARAMETER.
It's possible that this code path never worked because it is
checking for Windows version 8.0. Windows 8's version number is 6.2,
not 8.0.
Conflicts:
src/Win32_Interop/Win32_QFork.cpp
Fix for https://github.com/MSOpenTech/redis/issues/167
RejoinCOWPages used to call QueryWorkingSetEx to figure out
which pages had been dirtied since the memory map was protected
with PAGE_WRITECOPY. But dirty pages that had been swapped out to
the system page file would be reported as not valid
(VirtualAttributes.Valid == 0) and so we wouldn't restore them into
the file map.
QueryWorkingSetEx only gives information about pages that are in the
working set at the time it is called. Pages can be forced into the
working set using VirtualLock, but that seems like a potentially
risky / expensive solution.
I implemented a solution that uses VirtualQuery to find out which
regions have changed protection from PAGE_WRITECOPY.
The quasi-fork child was waiting for an explicit signal from the parent
before terminating. This synchronization step is unnecessary, and
it makes the child hang if the parent terminates for any reason
while the fork operation is in progress.
In that scenario, and consistently with the Posix version, the child
now completes the fork operation and terminates freely when done.
This fixes https://github.com/MSOpenTech/redis/issues/228
getpeername() is returning invalid addresses on ipv6 sockets accepted
with AcceptEx, filling only 16 bytes of the address structure.
Providing a workaround by saving the remote address returned by
GetAcceptExSockaddrs, which is valid.
The debug version of isprint() raises an assert when the input value
is not EOF or in the range 0 through 0xFF, inclusive.
The trick is that the char value needs to be passed as unsigned,
before being converted to int.
During diskless replication the master forks a child, which on posix
simply inherits the socket file descriptors for the connections to
the slaves.
A unix pipe is also used for the child to report the results back
to the master.
The bulk of the porting work is in making sure that the socket
file descriptors and pipe file descriptor are propagated correctly
from the master to its child.
Refactor BeginForkOperation in preparation for diskless replication:
- Separate copying of operation data and child process creation
- Provide specific entry points for each operation type
Alexis Campailla