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Paper Details

  title = "{B}locking {S}ystem {C}alls in {KR}o{C}/{L}inux",
  author= "Barnes, Frederick R. M.",
  editor= "Welch, Peter H. and Bakkers, Andr\`{e} W. P.",
  pages = "155--178",
  booktitle= "{C}ommunicating {P}rocess {A}rchitectures 2000",
  isbn= "1 58603 077 9",
  year= "2000",
  month= "sep",
  abstract= "This paper describes an extension to Kent Retargetable occam
     Compiler (KRoC), which enables the execution of a blocking
     call, without blocking the occam-kernel. This allows a
     process to make a blocking system call (eg, read, write),
     without blocking processes running in parallel with it.
     Blocking calls are implemented using Linux clones which
     communicate using shared memory, and synchronise using
     kernel level semaphores. The usefulness of this is apparent
     in server applications with a need to handle multiple
     clients simultaneously. An implementation of an occam
     web-server is described, which uses standard TCP sockets via
     an occam socket library. The web-server comes with the
     ability to execute CGI scripts as well as dispensing static
     pages, which demonstrates some level of OS process
     management from within occam. However, this mechanism is not
     limited to blocking in the Linux kernel. On multi-processor
     machines, the clones are quite free to be scheduled on
     different processors, allowing computationally heavy
     processing to be performed aside the occam world, but still
     with a reasonable level of interaction with it. Using them
     in this way provides a coarse-grained level of parallelism
     from within the fine-grained occam world."

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