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dnl
dnl Definitions for using shared memory
dnl
dnl/*D
dnl PAC_ARG_SHARED_MEMORY - add --with-shared-memory=kind to configure
dnl
dnl Synopsis:
dnl PAC_ARG_SHARED_MEMORY
dnl
dnl Output effects:
dnl Adds '--with-shared-memory' to the command line. Checks for available
dnl shared memory functionality.
dnl
dnl Supported values of 'kind' include \:
dnl+ auto - default
dnl. mmap - use mmap and munmap
dnl- sysv - use sysv shared memory functions
dnl D*/
AC_DEFUN([PAC_ARG_SHARED_MEMORY],[
# check how to allocate shared memory
AC_ARG_WITH(shared-memory,
AS_HELP_STRING([--with-shared-memory[=auto|sysv|mmap]],[create shared memory using sysv or mmap (default is auto)]),,
with_shared_memory=auto)
if test "$with_shared_memory" = auto -o "$with_shared_memory" = mmap; then
found_mmap_funcs=yes
AC_CHECK_FUNCS(mmap munmap, , found_mmap_funcs=no)
if test "$found_mmap_funcs" = yes ; then
with_shared_memory=mmap
AC_DEFINE(USE_MMAP_SHM,1,[Define if we have sysv shared memory])
AC_MSG_NOTICE([Using a memory-mapped file for shared memory])
elif test "$with_shared_memory" = mmap ; then
AC_MSG_ERROR([cannot support shared memory: mmap() or munmap() not found])
fi
fi
if test "$with_shared_memory" = auto -o "$with_shared_memory" = sysv; then
found_sysv_shm_funcs=yes
AC_CHECK_FUNCS(shmget shmat shmctl shmdt, , found_sysv_shm_funcs=no)
if test "$found_sysv_shm_funcs" = yes ; then
with_shared_memory=sysv
AC_DEFINE(USE_SYSV_SHM,1,[Define if we have sysv shared memory])
AC_MSG_NOTICE([Using SYSV shared memory])
elif test "$with_shared_memory" = sysv ; then
AC_MSG_ERROR([cannot support shared memory: sysv shared memory functions functions not found])
fi
fi
if test "$with_shared_memory" = nt ; then
AC_DEFINE(USE_NT_SHM,1,[Define if use Windows shared memory])
fi
if test "$with_shared_memory" = "auto" ; then
AC_MSG_ERROR([cannot support shared memory: need either sysv shared memory functions or mmap in order to support shared memory])
fi
])
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