Do other operating systems implement the Linux system call splice?

Question

In an application I am developing I use splice on Linux for socket-to-socket data transfer.

1. Do other operating systems (specifically at least Windows, OS X and FreeBSD) implement splice or an equivalent solution?
2. Is it possible to imitate socket-to-socket data spliceing on Windows with sendfile¹ + memmap¹?

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¹ Both exist on Windows under different names which I do not remember.

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Update

You can see the performance improvements of splice vs user space buffers on Linux.

• DF, DR, F, MF, MR are my application in its different tunneling modes, NX is NGINX web server
• -p+t uses the Linux system call splice
• +p-t uses a portable implementation with user space buffers
• +p+t uses a portable implementation with user space buffers and multiple OS threads
• bars represent throughput in gigaBYTE s per second
• a single 1 gigabyte (1048576000 bytes) file was requsted 4 times by 4 concurrent clients

Answer 1

OpenBSD has sosplice and somove: http://www.openbsd.org/cgi-bin/man.cgi?query=sosplice