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GNU Mach is an implementation of theMach microkernel. It is the defaultmicrokernel in theGNU Hurd. GNU Mach runs onIA-32 andx86-64 machines. GNU Mach is maintained by developers on the GNU project. It is distributed under the terms of theGNU General Public License (GPL).
Early versions of the Hurd were developed on top ofCMU's Mach 3.0.[2]
In 1994, CMU stopped working on Mach, and the GNU Project switched to theUniversity of Utah's Mach 4. The kernel known as "GNU Mach" was derived from Mach 4 once Utah stopped development. The first ChangeLog entry byThomas Bushnell (rather than by a Utah researcher) is from 16 December 1996.[3][4][5]
In 2002, Roland McGrath branched the OSKit-Mach branch from GNU Mach 1.2, intending to replace all the device drivers and some of the hardware support with code from OSKit. After the release of GNU Mach 1.3, this branch was intended to become the GNU Mach 2.0 main line; however, as of 2006, OSKit-Mach is not being developed due to lack of activity in OSKit itself.[6][7][8] Around 2006, an attempt to replaceGNU Hurd's kernel with theCoyotos kernel also ended in failure.[9]
GNU Mach 1.4 was released on 27 September 2013, eleven years after 1.3.[10]
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