ovs-thread: Add xpthread_barrier_*() wrappers.

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Signed-off-by: Ben Pfaff <blp@nicira.com>
timeval: localtime_r, gmtime_r for Windows.

Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
Makefile: Remove unnecessary includes of SSL_LIBS.

SSL_LIBS are needed for libopenvswitch and we include that
in lib/automake.mk. It is not necessary to include it
for every executable.

Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
Use __linux__ instead of LINUX_DATAPATH in C code.

The LINUX_DATAPATH C preprocessor symbol was originally meant to be used as
a signal for whether the Linux datapath module could be used, but it was
used as a proxy for a lot of other stuff that is really just Linux
specific.  This commit switches all of these users to just test for
__linux__, which is more straightforward and should have the same result.

CC: Luigi Rizzo <rizzo@iet.unipi.it>
Signed-off-by: Ben Pfaff <blp@nicira.com>
Makefile: Compile Linux-specific files based on __linux__ macro.

We want to conditionally compile several files based on whether we're
building for a Linux host, so we need some Automake conditional for that.
Previously this was based on whether Netlink is available and we're not
on ESX (since ESX has Netlink but isn't Linux), but it's more
straightforward to just test for Linux directly.

CC: Luigi Rizzo <rizzo@iet.unipi.it>
Signed-off-by: Ben Pfaff <blp@nicira.com>
timeval: clock_gettime() for Windows.

QueryPerformanceCounter() retrieves the current value of the performance
counter, which is a high resolution (<1us) time stamp that can be used for
time-interval measurements. So, use it for MONOTONIC clock.

The GetSystemTimePreciseAsFileTime() function retrieves the current system date
and time with the highest possible level of precision (<1us). Use it for
real time clock. This function returns a counter representing the number of
100-nanosecond intervals since January 1, 1601. To make it compatible with
Linux CLOCK_REALTIME, we need to calculate the 100-nanoseconds counter value
till 01/01/1970.

An upcoming commit implements gettimeofday() using the same clock, so,
carve out a function.

Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
timeval: gettimeofday() for Windows.

Use GetSystemTimePreciseAsFileTime() for gettimeofday().
GetSystemTimePreciseAsFileTime() provides the result that is more
high resolution than just the microsecond that gittimeofday() in
Linux provides. So we need to remove some additional precision.

Signed-off-by: Gurucharan Shetty <gshetty@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>