1*820c1a8dSHiroo HAYASHI# lock.m4 serial 14 2*820c1a8dSHiroo HAYASHIdnl Copyright (C) 2005-2021 Free Software Foundation, Inc. 3*820c1a8dSHiroo HAYASHIdnl This file is free software; the Free Software Foundation 4*820c1a8dSHiroo HAYASHIdnl gives unlimited permission to copy and/or distribute it, 5*820c1a8dSHiroo HAYASHIdnl with or without modifications, as long as this notice is preserved. 6*820c1a8dSHiroo HAYASHI 7*820c1a8dSHiroo HAYASHIdnl From Bruno Haible. 8*820c1a8dSHiroo HAYASHI 9*820c1a8dSHiroo HAYASHIAC_DEFUN([gl_LOCK], 10*820c1a8dSHiroo HAYASHI[ 11*820c1a8dSHiroo HAYASHI AC_REQUIRE([gl_THREADLIB]) 12*820c1a8dSHiroo HAYASHI if test "$gl_threads_api" = posix; then 13*820c1a8dSHiroo HAYASHI # OSF/1 4.0 and Mac OS X 10.1 lack the pthread_rwlock_t type and the 14*820c1a8dSHiroo HAYASHI # pthread_rwlock_* functions. 15*820c1a8dSHiroo HAYASHI has_rwlock=false 16*820c1a8dSHiroo HAYASHI AC_CHECK_TYPE([pthread_rwlock_t], 17*820c1a8dSHiroo HAYASHI [has_rwlock=true 18*820c1a8dSHiroo HAYASHI AC_DEFINE([HAVE_PTHREAD_RWLOCK], [1], 19*820c1a8dSHiroo HAYASHI [Define if the POSIX multithreading library has read/write locks.])], 20*820c1a8dSHiroo HAYASHI [], 21*820c1a8dSHiroo HAYASHI [#include <pthread.h>]) 22*820c1a8dSHiroo HAYASHI if $has_rwlock; then 23*820c1a8dSHiroo HAYASHI gl_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER 24*820c1a8dSHiroo HAYASHI fi 25*820c1a8dSHiroo HAYASHI # glibc defines PTHREAD_MUTEX_RECURSIVE as enum, not as a macro. 26*820c1a8dSHiroo HAYASHI AC_COMPILE_IFELSE([ 27*820c1a8dSHiroo HAYASHI AC_LANG_PROGRAM( 28*820c1a8dSHiroo HAYASHI [[#include <pthread.h>]], 29*820c1a8dSHiroo HAYASHI [[ 30*820c1a8dSHiroo HAYASHI#if __FreeBSD__ == 4 31*820c1a8dSHiroo HAYASHIerror "No, in FreeBSD 4.0 recursive mutexes actually don't work." 32*820c1a8dSHiroo HAYASHI#elif (defined __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ \ 33*820c1a8dSHiroo HAYASHI && __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 1070) 34*820c1a8dSHiroo HAYASHIerror "No, in Mac OS X < 10.7 recursive mutexes actually don't work." 35*820c1a8dSHiroo HAYASHI#else 36*820c1a8dSHiroo HAYASHIint x = (int)PTHREAD_MUTEX_RECURSIVE; 37*820c1a8dSHiroo HAYASHIreturn !x; 38*820c1a8dSHiroo HAYASHI#endif 39*820c1a8dSHiroo HAYASHI ]])], 40*820c1a8dSHiroo HAYASHI [AC_DEFINE([HAVE_PTHREAD_MUTEX_RECURSIVE], [1], 41*820c1a8dSHiroo HAYASHI [Define if the <pthread.h> defines PTHREAD_MUTEX_RECURSIVE.])]) 42*820c1a8dSHiroo HAYASHI fi 43*820c1a8dSHiroo HAYASHI gl_PREREQ_LOCK 44*820c1a8dSHiroo HAYASHI]) 45*820c1a8dSHiroo HAYASHI 46*820c1a8dSHiroo HAYASHI# Prerequisites of lib/glthread/lock.c. 47*820c1a8dSHiroo HAYASHIAC_DEFUN([gl_PREREQ_LOCK], [:]) 48