diff options
Diffstat (limited to 'm4/threadlib.m4')
| -rw-r--r-- | m4/threadlib.m4 | 73 |
1 files changed, 57 insertions, 16 deletions
diff --git a/m4/threadlib.m4 b/m4/threadlib.m4 index 045d9dad29..7972cfaebc 100644 --- a/m4/threadlib.m4 +++ b/m4/threadlib.m4 @@ -1,4 +1,4 @@ -# threadlib.m4 serial 20 +# threadlib.m4 serial 21 dnl Copyright (C) 2005-2019 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, @@ -16,7 +16,13 @@ dnl (it must be placed before the invocation of gl_THREADLIB_EARLY!), then the dnl default is 'no', otherwise it is system dependent. In both cases, the user dnl can change the choice through the options --enable-threads=choice or dnl --disable-threads. -dnl Defines at most one of the macros USE_POSIX_THREADS, USE_WINDOWS_THREADS. +dnl Defines at most one of the macros USE_ISOC_THREADS, USE_POSIX_THREADS, +dnl USE_ISOC_AND_POSIX_THREADS, USE_WINDOWS_THREADS. +dnl The choice --enable-threads=isoc+posix is available only on platforms that +dnl have both the ISO C and the POSIX threads APIs. It has the effect of using +dnl the ISO C API for most things and the POSIX API only for creating and +dnl controlling threads (because there is no equivalent to pthread_atfork in +dnl the ISO C API). dnl Sets the variables LIBTHREAD and LTLIBTHREAD to the linker options for use dnl in a Makefile (LIBTHREAD for use without libtool, LTLIBTHREAD for use with dnl libtool). @@ -54,7 +60,7 @@ AC_DEFUN([gl_THREADLIB_EARLY_BODY], [m4_divert_text([DEFAULTS], [gl_use_threads_default=])]) m4_divert_text([DEFAULTS], [gl_use_winpthreads_default=]) AC_ARG_ENABLE([threads], -AC_HELP_STRING([--enable-threads={posix|windows}], [specify multithreading API])m4_ifdef([gl_THREADLIB_DEFAULT_NO], [], [ +AC_HELP_STRING([--enable-threads={isoc|posix|isoc+posix|windows}], [specify multithreading API])m4_ifdef([gl_THREADLIB_DEFAULT_NO], [], [ AC_HELP_STRING([--disable-threads], [build without multithread safety])]), [gl_use_threads=$enableval], [if test -n "$gl_use_threads_default"; then @@ -88,8 +94,11 @@ changequote(,)dnl changequote([,])dnl fi ]) - if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then - # For using <pthread.h>: + if test "$gl_use_threads" = yes \ + || test "$gl_use_threads" = isoc \ + || test "$gl_use_threads" = posix \ + || test "$gl_use_threads" = isoc+posix; then + # For using <threads.h> or <pthread.h>: case "$host_os" in osf*) # On OSF/1, the compiler needs the flag -D_REENTRANT so that it @@ -169,7 +178,26 @@ int main () AC_CHECK_HEADERS_ONCE([threads.h]) : fi - if test "$gl_use_threads" = yes || test "$gl_use_threads" = posix; then + if test "$gl_use_threads" = isoc || test "$gl_use_threads" = isoc+posix; then + AC_CHECK_HEADERS_ONCE([threads.h]) + if test $ac_cv_header_threads_h = yes; then + gl_have_isoc_threads= + # Test whether both mtx_lock and cnd_timedwait exist in libc. + AC_LINK_IFELSE( + [AC_LANG_PROGRAM( + [[#include <threads.h> + #include <stddef.h> + mtx_t m; + cnd_t c; + ]], + [[mtx_lock (&m); + cnd_timedwait (&c, &m, NULL);]])], + [gl_have_isoc_threads=yes]) + fi + fi + if test "$gl_use_threads" = yes \ + || test "$gl_use_threads" = posix \ + || test "$gl_use_threads" = isoc+posix; then # On OSF/1, the compiler needs the flag -pthread or -D_REENTRANT so that # it groks <pthread.h>. It's added above, in gl_THREADLIB_EARLY_BODY. AC_CHECK_HEADER([pthread.h], @@ -238,21 +266,34 @@ int main () fi fi if test -n "$gl_have_pthread"; then - gl_threads_api=posix - AC_DEFINE([USE_POSIX_THREADS], [1], - [Define if the POSIX multithreading library can be used.]) - if test -n "$LIBMULTITHREAD" || test -n "$LTLIBMULTITHREAD"; then - if case "$gl_cv_have_weak" in *yes) true;; *) false;; esac; then - AC_DEFINE([USE_POSIX_THREADS_WEAK], [1], - [Define if references to the POSIX multithreading library should be made weak.]) - LIBTHREAD= - LTLIBTHREAD= + if test "$gl_use_threads" = isoc+posix && test "$gl_have_isoc_threads" = yes; then + gl_threads_api='isoc+posix' + AC_DEFINE([USE_ISOC_AND_POSIX_THREADS], [1], + [Define if the combination of the ISO C and POSIX multithreading APIs can be used.]) + LIBTHREAD= LTLIBTHREAD= + else + gl_threads_api=posix + AC_DEFINE([USE_POSIX_THREADS], [1], + [Define if the POSIX multithreading library can be used.]) + if test -n "$LIBMULTITHREAD" || test -n "$LTLIBMULTITHREAD"; then + if case "$gl_cv_have_weak" in *yes) true;; *) false;; esac; then + AC_DEFINE([USE_POSIX_THREADS_WEAK], [1], + [Define if references to the POSIX multithreading library should be made weak.]) + LIBTHREAD= LTLIBTHREAD= + fi fi fi fi fi fi - if test -z "$gl_have_pthread"; then + if test $gl_threads_api = none; then + if test "$gl_use_threads" = isoc && test "$gl_have_isoc_threads" = yes; then + gl_threads_api=isoc + AC_DEFINE([USE_ISOC_THREADS], [1], + [Define if the ISO C multithreading library can be used.]) + fi + fi + if test $gl_threads_api = none; then case "$gl_use_threads" in yes | windows | win32) # The 'win32' is for backward compatibility. if { case "$host_os" in |