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- # lock.m4 serial 14
- dnl Copyright (C) 2005-2021 Free Software Foundation, Inc.
- dnl This file is free software; the Free Software Foundation
- dnl gives unlimited permission to copy and/or distribute it,
- dnl with or without modifications, as long as this notice is preserved.
- dnl From Bruno Haible.
- AC_DEFUN([gl_LOCK],
- [
- AC_REQUIRE([gl_THREADLIB])
- if test "$gl_threads_api" = posix; then
- # OSF/1 4.0 and Mac OS X 10.1 lack the pthread_rwlock_t type and the
- # pthread_rwlock_* functions.
- has_rwlock=false
- AC_CHECK_TYPE([pthread_rwlock_t],
- [has_rwlock=true
- AC_DEFINE([HAVE_PTHREAD_RWLOCK], [1],
- [Define if the POSIX multithreading library has read/write locks.])],
- [],
- [#include <pthread.h>])
- if $has_rwlock; then
- gl_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER
- fi
- # glibc defines PTHREAD_MUTEX_RECURSIVE as enum, not as a macro.
- AC_COMPILE_IFELSE([
- AC_LANG_PROGRAM(
- [[#include <pthread.h>]],
- [[
- #if __FreeBSD__ == 4
- error "No, in FreeBSD 4.0 recursive mutexes actually don't work."
- #elif (defined __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ \
- && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1070)
- error "No, in Mac OS X < 10.7 recursive mutexes actually don't work."
- #else
- int x = (int)PTHREAD_MUTEX_RECURSIVE;
- return !x;
- #endif
- ]])],
- [AC_DEFINE([HAVE_PTHREAD_MUTEX_RECURSIVE], [1],
- [Define if the <pthread.h> defines PTHREAD_MUTEX_RECURSIVE.])])
- fi
- gl_PREREQ_LOCK
- ])
- # Prerequisites of lib/glthread/lock.c.
- AC_DEFUN([gl_PREREQ_LOCK], [:])
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