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dnl
dnl Copyright (c) 2004-2006 The Trustees of Indiana University and Indiana
dnl University Research and Technology
dnl Corporation. All rights reserved.
dnl Copyright (c) 2004-2005 The University of Tennessee and The University
dnl of Tennessee Research Foundation. All rights
dnl reserved.
dnl Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
dnl University of Stuttgart. All rights reserved.
dnl Copyright (c) 2004-2005 The Regents of the University of California.
dnl All rights reserved.
dnl Copyright (c) 2008-2013 Cisco Systems, Inc. All rights reserved.
dnl Copyright (c) 2017 Intel, Inc. All rights reserved.
dnl $COPYRIGHT$
dnl
dnl Additional copyrights may follow
dnl
dnl $HEADER$
dnl
AC_DEFUN([PMIX_CHECK_PTHREAD_PIDS],[
#
# Arguments: none
#
# Dependencies: None
#
# Sets:
# PMIX_THREADS_HAVE_DIFFERENT_PIDS (variable)
#
# Test for Linux-like threads in the system. PMIX does not support
# systems with different PIDs for threads in the same process, so error
# out if we detect that case.
#
AC_MSG_CHECKING([if threads have different pids (pthreads on linux)])
PMIX_VAR_SCOPE_PUSH([tpids_CFLAGS_save tpids_CPPFLAGS_save tpids_LDFLAGS_save tpids_LIBS_save tpids_MSG])
tpids_CFLAGS_save="$CFLAGS"
CFLAGS="$CFLAGS $THREAD_CFLAGS"
tpids_CPPFLAGS_save="$CPPFLAGS"
CPPFLAGS="$CPPFLAGS $THREAD_CPPFLAGS"
tpids_LDFLAGS_save="$LDFLAGS"
LDFLAGS="$LDFLAGS $THREAD_LDFLAGS"
tpids_LIBS_save="$LIBS"
LIBS="$LIBS $THREAD_LIBS"
AC_RUN_IFELSE([AC_LANG_SOURCE([#include <pthread.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
void *checkpid(void *arg);
int main(void) {
pthread_t thr;
int pid, *retval;
pid = getpid();
pthread_create(&thr, NULL, checkpid, &pid);
pthread_join(thr, (void **) &retval);
exit(*retval);
}
static int ret;
void *checkpid(void *arg) {
int ppid = *((int *) arg);
if (ppid == getpid())
ret = 0;
else
ret = 1;
pthread_exit((void *) &ret);
}])],
[tpids_MSG=no PMIX_THREADS_HAVE_DIFFERENT_PIDS=0],
[tpids_MSG=yes PMIX_THREADS_HAVE_DIFFERENT_PIDS=1],
[
# If we're cross compiling, we can't do another AC_* function here because
# it we haven't displayed the result from the last one yet. So defer
# another test until below.
PMIX_THREADS_HAVE_DIFFERENT_PIDS=
MSG="cross compiling (need another test)"])
CFLAGS="$tpids_CFLAGS_save"
CPPFLAGS="$tpids_CPPFLAGS_save"
LDFLAGS="$tpids_LDFLAGS_save"
LIBS="$tpids_LIBS_save"
AC_MSG_RESULT([$tpids_MSG])
AS_IF([test "x$PMIX_THREADS_HAVE_DIFFERENT_PIDS" = "x"],
[ # If we are cross-compiling, look for the symbol
# __linuxthreads_create_event, which seems to only exist in the
# Linux Threads-based pthreads implementation (i.e., the one
# that has different PIDs for each thread). We *could* switch
# on $host here and only test *linux* hosts, but this test is
# pretty unique, so why bother? Note that AC_CHECK_FUNC works
# properly in cross-compiling environments in recent-enough
# versions of Autoconf (which is one of the reasons we mandate
# recent versions in autogen!).
AC_CHECK_FUNC([__linuxthreads_create_event],
[PMIX_THREADS_HAVE_DIFFERENT_PIDS=1])])
AS_IF([test "$PMIX_THREADS_HAVE_DIFFERENT_PIDS" = "1"],
[AC_MSG_WARN([This version of PMIx only supports environments where])
AC_MSG_WARN([threads have the same PID])
AC_MSG_ERROR([Cannot continue])
])
#
# if pthreads is not available, then the system does not have an insane threads
# model
#
PMIX_VAR_SCOPE_POP])dnl
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