lock.m4 (1567B)
1 # lock.m4 serial 14 2 dnl Copyright (C) 2005-2021 Free Software Foundation, Inc. 3 dnl This file is free software; the Free Software Foundation 4 dnl gives unlimited permission to copy and/or distribute it, 5 dnl with or without modifications, as long as this notice is preserved. 6 7 dnl From Bruno Haible. 8 9 AC_DEFUN([gl_LOCK], 10 [ 11 AC_REQUIRE([gl_THREADLIB]) 12 if test "$gl_threads_api" = posix; then 13 # OSF/1 4.0 and Mac OS X 10.1 lack the pthread_rwlock_t type and the 14 # pthread_rwlock_* functions. 15 has_rwlock=false 16 AC_CHECK_TYPE([pthread_rwlock_t], 17 [has_rwlock=true 18 AC_DEFINE([HAVE_PTHREAD_RWLOCK], [1], 19 [Define if the POSIX multithreading library has read/write locks.])], 20 [], 21 [#include <pthread.h>]) 22 if $has_rwlock; then 23 gl_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER 24 fi 25 # glibc defines PTHREAD_MUTEX_RECURSIVE as enum, not as a macro. 26 AC_COMPILE_IFELSE([ 27 AC_LANG_PROGRAM( 28 [[#include <pthread.h>]], 29 [[ 30 #if __FreeBSD__ == 4 31 error "No, in FreeBSD 4.0 recursive mutexes actually don't work." 32 #elif (defined __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ \ 33 && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1070) 34 error "No, in Mac OS X < 10.7 recursive mutexes actually don't work." 35 #else 36 int x = (int)PTHREAD_MUTEX_RECURSIVE; 37 return !x; 38 #endif 39 ]])], 40 [AC_DEFINE([HAVE_PTHREAD_MUTEX_RECURSIVE], [1], 41 [Define if the <pthread.h> defines PTHREAD_MUTEX_RECURSIVE.])]) 42 fi 43 gl_PREREQ_LOCK 44 ]) 45 46 # Prerequisites of lib/glthread/lock.c. 47 AC_DEFUN([gl_PREREQ_LOCK], [:])