[SCM] make branch, master, updated. 4.1-40-gfd1dd7c

[Paul D. Smith]

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- Log -----------------------------------------------------------------
commit fd1dd7c398974b05950735a724838c09eb72ad1e
Author: Paul Smith <address@hidden>
Date:   Sun Mar 13 01:12:07 2016 -0500

    [SV 44555] Use vfork() instead of fork() where available.
    
    Testing has shown that vfork() is actually significantly
    more efficient on systems where it's supported, even for
    copy-on-write implementations.  If make is big enough,
    duplicating the page tables is significant overhead.
    
    * configure.ac: Check for fork/vfork.
    * makeint.h: Include vfork.h and set up #define for it.
    * os.h, posixos.c (get_bad_stdin): For children who can't use
    the normal stdin file descriptor, get a broken one.
    * job.c (start_job_command): Avoid so many ifdefs and simplify
    the invocation of child_execute_job()
    (child_execute_job): move the fork operation here so it can
    return early for the parent process.  Switch to use vfork().
    * function.c (func_shell_base): Use new child_execute_job() and
    simplify ifdefs.
    * job.h, main.c, remote-cstms.c, vmsjobs.c, w32os.c: Update
    declarations and calls.

-----------------------------------------------------------------------

Summary of changes:
 configure.ac   |    2 +
 function.c     |  174 +++++++++++++++++++++----------------------
 job.c          |  230 ++++++++++++++++++++++----------------------------------
 job.h          |   14 +--
 main.c         |    3 +-
 makeint.h      |    7 ++
 os.h           |   11 ++-
 posixos.c      |   66 ++++++++++++----
 remote-cstms.c |    2 +-
 vmsjobs.c      |    2 +-
 w32/w32os.c    |    4 +-
 11 files changed, 254 insertions(+), 261 deletions(-)


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