bffa5c8f7e
* Convert from AC_TRY_RUN to AC_RUN_IFELSE. * Excellent suggestion from Paul Hargrove: use AC_CHECK_FUNC to look for a Linuxthreads-specific symbol when we're cross compiling to see if threads will have different PIDs (because AC_CHECK_FUNC works properly even when in cross-compiling environments). Background: the old/Linuxthreads-based pthreads implementation used the Linux clone() call to make threads, which effectively meant that each thread had a different PID. The new NPTL pthreads implementation does things better, meaning that threads have the same PID. Open MPI no longer supports threads with different PIDs -- we ripped out the supporting code for threads with different PIDs because we don't have systems available to test this on anymore (anyone who still has such a system can still use older versions of Open MPI). Hence, configure needs to determine whether the target system will have the same PID for threads or not -- even if we're cross-compiling. The current test compiles and runs a multi-threaded app that checks PIDs of different threads, but we clearly can't do that in a cross-compiling environment. So use AC_CHECK_FUNC in cross-compiling environments. Simple, no? This commit was SVN r24537.
111 строки
3.7 KiB
Plaintext
111 строки
3.7 KiB
Plaintext
dnl
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dnl Copyright (c) 2004-2006 The Trustees of Indiana University and Indiana
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dnl University Research and Technology
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dnl Corporation. All rights reserved.
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dnl Copyright (c) 2004-2005 The University of Tennessee and The University
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dnl of Tennessee Research Foundation. All rights
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dnl reserved.
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dnl Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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dnl University of Stuttgart. All rights reserved.
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dnl Copyright (c) 2004-2005 The Regents of the University of California.
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dnl All rights reserved.
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dnl Copyright (c) 2008-2011 Cisco Systems, Inc. All rights reserved.
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dnl $COPYRIGHT$
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dnl
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dnl Additional copyrights may follow
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dnl
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dnl $HEADER$
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dnl
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AC_DEFUN([OPAL_CHECK_PTHREAD_PIDS],[
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#
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# Arguments: none
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#
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# Dependencies: None
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#
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# Sets:
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# OPAL_THREADS_HAVE_DIFFERENT_PIDS (variable)
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#
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# Test for Linux-like threads in the system. OPAL no longer supports
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# systems with different PIDs for threads in the same process, so error
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# out if we detect that case.
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#
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AC_MSG_CHECKING([if threads have different pids (pthreads on linux)])
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CFLAGS_save="$CFLAGS"
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CFLAGS="$CFLAGS $THREAD_CFLAGS"
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CPPFLAGS_save="$CPPFLAGS"
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CPPFLAGS="$CPPFLAGS $THREAD_CPPFLAGS"
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LDFLAGS_save="$LDFLAGS"
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LDFLAGS="$LDFLAGS $THREAD_LDFLAGS"
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LIBS_save="$LIBS"
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LIBS="$LIBS $THREAD_LIBS"
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AC_RUN_IFELSE([AC_LANG_SOURCE([#include <pthread.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdlib.h>
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void *checkpid(void *arg);
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int main() {
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pthread_t thr;
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int pid, *retval;
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pid = getpid();
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pthread_create(&thr, NULL, checkpid, &pid);
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pthread_join(thr, (void **) &retval);
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exit(*retval);
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}
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static int ret;
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void *checkpid(void *arg) {
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int ppid = *((int *) arg);
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if (ppid == getpid())
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ret = 0;
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else
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ret = 1;
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pthread_exit((void *) &ret);
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}])],
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[MSG=no OPAL_THREADS_HAVE_DIFFERENT_PIDS=0],
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[MSG=yes OPAL_THREADS_HAVE_DIFFERENT_PIDS=1],
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[
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# If we're cross compiling, we can't do another AC_* function here beause
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# it we haven't displayed the result from the last one yet. So defer
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# another test until below.
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OPAL_THREADS_HAVE_DIFFERENT_PIDS=
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MSG="cross compiling (need another test)"])
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CFLAGS="$CFLAGS_save"
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CPPFLAGS="$CPPFLAGS_save"
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LDFLAGS="$LDFLAGS_save"
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LIBS="$LIBS_save"
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AC_MSG_RESULT([$MSG])
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AS_IF([test "x$OPAL_THREADS_HAVE_DIFFERENT_PIDS" = "x"],
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[ # If we are cross-compiling, look for the symbol
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# __linuxthreads_create_event, which seems to only exist in the
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# Linux Threads-based pthreads implementation (i.e., the one
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# that has different PIDs for each thread). We *could* switch
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# on $host here and only test *linux* hosts, but this test is
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# pretty unique, so why bother? Note that AC_CHECK_FUNC works
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# properly in cross-compiling environments in recent-enough
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# versions of Autoconf (which is one of the reasons we mandate
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# recent versions in autogen!).
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AC_CHECK_FUNC([__linuxthreads_create_event],
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[OPAL_THREADS_HAVE_DIFFERENT_PIDS=1])])
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AS_IF([test "$OPAL_THREADS_HAVE_DIFFERENT_PIDS" = "1"],
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[AC_MSG_WARN([This version of Open MPI only supports environments where])
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AC_MSG_WARN([threads have the same PID. Please use an older version of])
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AC_MSG_WARN([Open MPI if you need support on systems with different])
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AC_MSG_WARN([PIDs for threads in the same process. Open MPI 1.4.x])
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AC_MSG_WARN([supports such systems, as does at least some versions the])
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AC_MSG_WARN([Open MPI 1.5.x series.])
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AC_MSG_ERROR([Cannot continue])
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])
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#
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# if pthreads is not available, then the system does not have an insane threads
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# model
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#
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unset MSG])dnl
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