10Sstevel@tonic-gate# lock.m4 serial 14
20Sstevel@tonic-gatednl Copyright (C) 2005-2022 Free Software Foundation, Inc.
30Sstevel@tonic-gatednl This file is free software; the Free Software Foundation
40Sstevel@tonic-gatednl gives unlimited permission to copy and/or distribute it,
53066Sjgdnl with or without modifications, as long as this notice is preserved.
63066Sjg
70Sstevel@tonic-gatednl From Bruno Haible.
80Sstevel@tonic-gate
90Sstevel@tonic-gateAC_DEFUN([gl_LOCK],
100Sstevel@tonic-gate[
110Sstevel@tonic-gate  AC_REQUIRE([gl_THREADLIB])
120Sstevel@tonic-gate  if test "$gl_threads_api" = posix; then
130Sstevel@tonic-gate    # OSF/1 4.0 and Mac OS X 10.1 lack the pthread_rwlock_t type and the
140Sstevel@tonic-gate    # pthread_rwlock_* functions.
150Sstevel@tonic-gate    has_rwlock=false
160Sstevel@tonic-gate    AC_CHECK_TYPE([pthread_rwlock_t],
170Sstevel@tonic-gate      [has_rwlock=true
180Sstevel@tonic-gate       AC_DEFINE([HAVE_PTHREAD_RWLOCK], [1],
190Sstevel@tonic-gate         [Define if the POSIX multithreading library has read/write locks.])],
200Sstevel@tonic-gate      [],
210Sstevel@tonic-gate      [#include <pthread.h>])
220Sstevel@tonic-gate    if $has_rwlock; then
230Sstevel@tonic-gate      gl_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER
243066Sjg    fi
250Sstevel@tonic-gate    # glibc defines PTHREAD_MUTEX_RECURSIVE as enum, not as a macro.
260Sstevel@tonic-gate    AC_COMPILE_IFELSE([
273066Sjg      AC_LANG_PROGRAM(
280Sstevel@tonic-gate        [[#include <pthread.h>]],
290Sstevel@tonic-gate        [[
300Sstevel@tonic-gate#if __FreeBSD__ == 4
310Sstevel@tonic-gateerror "No, in FreeBSD 4.0 recursive mutexes actually don't work."
320Sstevel@tonic-gate#elif (defined __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ \
330Sstevel@tonic-gate       && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1070)
340Sstevel@tonic-gateerror "No, in Mac OS X < 10.7 recursive mutexes actually don't work."
350Sstevel@tonic-gate#else
360Sstevel@tonic-gateint x = (int)PTHREAD_MUTEX_RECURSIVE;
370Sstevel@tonic-gatereturn !x;
380Sstevel@tonic-gate#endif
390Sstevel@tonic-gate        ]])],
400Sstevel@tonic-gate      [AC_DEFINE([HAVE_PTHREAD_MUTEX_RECURSIVE], [1],
410Sstevel@tonic-gate         [Define if the <pthread.h> defines PTHREAD_MUTEX_RECURSIVE.])])
420Sstevel@tonic-gate  fi
430Sstevel@tonic-gate  gl_PREREQ_LOCK
440Sstevel@tonic-gate])
450Sstevel@tonic-gate
460Sstevel@tonic-gate# Prerequisites of lib/glthread/lock.c.
470Sstevel@tonic-gateAC_DEFUN([gl_PREREQ_LOCK], [:])
480Sstevel@tonic-gate