diff options
Diffstat (limited to 'mcon/U/d_msem_lck.U')
| -rw-r--r-- | mcon/U/d_msem_lck.U | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/mcon/U/d_msem_lck.U b/mcon/U/d_msem_lck.U new file mode 100644 index 0000000..f35de33 --- /dev/null +++ b/mcon/U/d_msem_lck.U @@ -0,0 +1,42 @@ +?RCS: $Id$ +?RCS: +?RCS: Copyright (c) 1991-1997, 2004-2006, Raphael Manfredi +?RCS: +?RCS: You may redistribute only under the terms of the Artistic License, +?RCS: as specified in the README file that comes with the distribution. +?RCS: You may reuse parts of this distribution only within the terms of +?RCS: that same Artistic License; a copy of which may be found at the root +?RCS: of the source tree for dist 4.0. +?RCS: +?RCS: $Log: d_msem_lck.U,v $ +?MAKE:d_msem_lck: Trylink cat i_sysmman +?MAKE: -pick add $@ %< +?S:d_msem_lck: +?S: This variable conditionally defines HAS_MSEM_LOCK if msem_lock() is +?S: available, thereby indicating kernel support for memory semaphores. +?S:. +?C:HAS_MSEM_LOCK: +?C: This symbol, if defined, indicates that memory semaphores are +?C: available to protect mmap()'ed regions. +?C:. +?H:#$d_msem_lck HAS_MSEM_LOCK /**/ +?H:. +?LINT:set d_msem_lck +: see if msem_lock exists +$cat >try.c <<EOC +#$i_sysmman I_SYS_MMAN +#ifdef I_SYS_MMAN +#include <sys/mman.h> +#endif +int main(void) +{ + static int ret; + static msemaphore *sem; + ret |= msem_lock(sem, MSEM_IF_NOWAIT); + return ret ? 0 : 1; +} +EOC +cyn=msem_lock +set d_msem_lck +eval $trylink + |