| 1 | # lock.m4 serial 14
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| 2 | dnl Copyright (C) 2005-2021 Free Software Foundation, Inc.
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| 3 | dnl This file is free software; the Free Software Foundation
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| 4 | dnl gives unlimited permission to copy and/or distribute it,
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| 5 | dnl with or without modifications, as long as this notice is preserved.
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| 6 |
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| 7 | dnl From Bruno Haible.
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| 8 |
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| 9 | AC_DEFUN([gl_LOCK],
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| 10 | [
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| 11 | AC_REQUIRE([gl_THREADLIB])
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| 12 | if test "$gl_threads_api" = posix; then
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| 13 | # OSF/1 4.0 and Mac OS X 10.1 lack the pthread_rwlock_t type and the
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| 14 | # pthread_rwlock_* functions.
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| 15 | has_rwlock=false
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| 16 | AC_CHECK_TYPE([pthread_rwlock_t],
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| 17 | [has_rwlock=true
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| 18 | AC_DEFINE([HAVE_PTHREAD_RWLOCK], [1],
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| 19 | [Define if the POSIX multithreading library has read/write locks.])],
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| 20 | [],
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| 21 | [#include <pthread.h>])
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| 22 | if $has_rwlock; then
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| 23 | gl_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER
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| 24 | fi
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| 25 | # glibc defines PTHREAD_MUTEX_RECURSIVE as enum, not as a macro.
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| 26 | AC_COMPILE_IFELSE([
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| 27 | AC_LANG_PROGRAM(
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| 28 | [[#include <pthread.h>]],
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| 29 | [[
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| 30 | #if __FreeBSD__ == 4
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| 31 | error "No, in FreeBSD 4.0 recursive mutexes actually don't work."
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| 32 | #elif (defined __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ \
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| 33 | && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1070)
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| 34 | error "No, in Mac OS X < 10.7 recursive mutexes actually don't work."
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| 35 | #else
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| 36 | int x = (int)PTHREAD_MUTEX_RECURSIVE;
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| 37 | return !x;
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| 38 | #endif
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| 39 | ]])],
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| 40 | [AC_DEFINE([HAVE_PTHREAD_MUTEX_RECURSIVE], [1],
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| 41 | [Define if the <pthread.h> defines PTHREAD_MUTEX_RECURSIVE.])])
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| 42 | fi
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| 43 | gl_PREREQ_LOCK
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| 44 | ])
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| 45 |
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| 46 | # Prerequisites of lib/glthread/lock.c.
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| 47 | AC_DEFUN([gl_PREREQ_LOCK], [:])
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