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