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Annotation of embedaddon/libiconv/srcm4/lock.m4, revision 1.1.1.3

1.1.1.3 ! misho       1: # lock.m4 serial 14
        !             2: dnl Copyright (C) 2005-2019 Free Software Foundation, Inc.
1.1       misho       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
1.1.1.3 ! misho      13:     # OSF/1 4.0 and Mac OS X 10.1 lack the pthread_rwlock_t type and the
1.1       misho      14:     # pthread_rwlock_* functions.
1.1.1.3 ! misho      15:     has_rwlock=false
1.1       misho      16:     AC_CHECK_TYPE([pthread_rwlock_t],
1.1.1.3 ! misho      17:       [has_rwlock=true
        !            18:        AC_DEFINE([HAVE_PTHREAD_RWLOCK], [1],
1.1       misho      19:          [Define if the POSIX multithreading library has read/write locks.])],
                     20:       [],
                     21:       [#include <pthread.h>])
1.1.1.3 ! misho      22:     if $has_rwlock; then
        !            23:       gl_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER
        !            24:     fi
1.1       misho      25:     # glibc defines PTHREAD_MUTEX_RECURSIVE as enum, not as a macro.
1.1.1.2   misho      26:     AC_COMPILE_IFELSE([
                     27:       AC_LANG_PROGRAM(
                     28:         [[#include <pthread.h>]],
                     29:         [[
                     30: #if __FreeBSD__ == 4
1.1       misho      31: error "No, in FreeBSD 4.0 recursive mutexes actually don't work."
1.1.1.3 ! misho      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."
1.1       misho      35: #else
                     36: int x = (int)PTHREAD_MUTEX_RECURSIVE;
                     37: return !x;
1.1.1.2   misho      38: #endif
                     39:         ]])],
1.1       misho      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: 
1.1.1.3 ! misho      46: # Prerequisites of lib/glthread/lock.c.
        !            47: AC_DEFUN([gl_PREREQ_LOCK], [:])