   __  __ __  __ 
  |  \/  |  \/  |
  | |\/| | |\/| |
  | |  | | |  | |
  |_|  |_|_|  |_|
                 
  MM - Shared Memory Library
  Copyright (c) 1999 Ralf S. Engelschall, All Rights Reserved. 

  Apache Knowledge:

                 MMAP     SHMGET
  -------------- -------- -------
  FreeBSD        x        x
  NetBSD         x        x
  OpenBSD        x        x
  Linux          x        x
  SunOS 4.1      x        -
  Solaris 2.x    x        -
  IRIX           x        x
  HPUX 9/10      x        -
  HPUX 11        x        -
  OSF1           x        -
  UnixWare       x        x
  SCO 5          x        -
  HIUX           -        x
  AIX            x        -
  Rhapsody       x        -
  Apollo         x        -
  Paragon        x        -
  QNX            x        -
  LynxOS         x        -
  Convex OS 11   x        -
  AUX 3          -        x
  ISC            -        x
  NewsOS         -        x
  SVR4           -        x
  MPE            -        x

  Ranking:

  1. MMANON
  2. MMPOSX 
  3. IPCSHM  disadvantage: only SysV
  4. MMZERO  disadvantage: /dev/zero and conflicts
  5. MMFILE  disadvantage: needs to create a file

  1. FCNTL  
  2. IPCSEM  disadvantage: only SysV and cleanup
  3. FLOCK   disadvantage: private filedescriptors

