test: handle zero-length udp datagram (#4344)

Under rare but benign circumstances (on XNU), incoming datagrams appear
to be dropped by the operating system after libuv has been notified

test: handle zero-length udp datagram (#4344)

Under rare but benign circumstances (on XNU), incoming datagrams appear
to be dropped by the operating system after libuv has been notified of
their arrival but before libuv has had a chance to receive them.

Fixes: https://github.com/libuv/libuv/issues/4219

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test: switch to new-style ASSERT_EQ macros (#4159)

Switch from old-style ASSERT macro to new-style ASSERT_EQ,... macros.

Using new-style macros makes it easier to debug test failure

test: switch to new-style ASSERT_EQ macros (#4159)

Switch from old-style ASSERT macro to new-style ASSERT_EQ,... macros.

Using new-style macros makes it easier to debug test failures

Fixes: https://github.com/libuv/libuv/issues/2974

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test: silence more valgrind warnings (#3917)

Pass the loop to MAKE_VALGRIND_HAPPY() so it's explicit on which loop
needs to be cleaned up. Since it asserts on uv_loop_close(), need to

test: silence more valgrind warnings (#3917)

Pass the loop to MAKE_VALGRIND_HAPPY() so it's explicit on which loop
needs to be cleaned up. Since it asserts on uv_loop_close(), need to
remove a couple of those that were being done before the call.

Cleanup where loop was assigned, so the entire test either uses loop or
uv_default_loop(). Not both.

Also take care of any reqs that may have been left uncleaned.

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win: optimize udp receive performance (#3807)

Do at most 32 nonblocking udp receive in a row.

Fixes: https://github.com/libuv/libuv/issues/3704