48 lines
1.5 KiB
Plaintext
48 lines
1.5 KiB
Plaintext
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# lock.m4 serial 14
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dnl Copyright (C) 2005-2023 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl From Bruno Haible.
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AC_DEFUN([gl_LOCK],
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[
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AC_REQUIRE([gl_THREADLIB])
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if test "$gl_threads_api" = posix; then
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# OSF/1 4.0 and Mac OS X 10.1 lack the pthread_rwlock_t type and the
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# pthread_rwlock_* functions.
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has_rwlock=false
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AC_CHECK_TYPE([pthread_rwlock_t],
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[has_rwlock=true
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AC_DEFINE([HAVE_PTHREAD_RWLOCK], [1],
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[Define if the POSIX multithreading library has read/write locks.])],
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[],
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[#include <pthread.h>])
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if $has_rwlock; then
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gl_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER
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fi
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# glibc defines PTHREAD_MUTEX_RECURSIVE as enum, not as a macro.
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AC_COMPILE_IFELSE([
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AC_LANG_PROGRAM(
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[[#include <pthread.h>]],
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[[
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#if __FreeBSD__ == 4
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error "No, in FreeBSD 4.0 recursive mutexes actually don't work."
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#elif (defined __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ \
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&& __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1070)
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error "No, in Mac OS X < 10.7 recursive mutexes actually don't work."
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#else
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int x = (int)PTHREAD_MUTEX_RECURSIVE;
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return !x;
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#endif
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]])],
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[AC_DEFINE([HAVE_PTHREAD_MUTEX_RECURSIVE], [1],
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[Define if the <pthread.h> defines PTHREAD_MUTEX_RECURSIVE.])])
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fi
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gl_PREREQ_LOCK
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])
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# Prerequisites of lib/glthread/lock.c.
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AC_DEFUN([gl_PREREQ_LOCK], [:])
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