
   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

