source: trunk/m4/pthread_condattr.m4 @ 704

# Copyright (c) 2005-2008 David Carter <dcarter@arm4.org> and others.
# All rights reserved.   This program and the accompanying materials
# are made available under the terms of the Eclipse Public License v1.0
# which accompanies this distribution, and is available at
# http://www.eclipse.org/legal/epl-v10.html

# Macros to check wether pthread mutexes can be used across processes

AC_DEFUN([ARM4_PTHREAD_CONDATTR_PROCESS],
[
  pthread_mutex_ok="no"
  no_pthread=""
  AC_MSG_CHECKING(for POSIX mutex condattr setpshared support)
  ac_save_LIBS="$LIBS"
  LIBS="$LIBS -lpthread"
  AC_RUN_IFELSE([
#include <stdio.h>
#include <pthread.h>

int main (void)
{
  pthread_condattr_t mattr;
  int shared;
        
  /* Sequence semaphore */
  pthread_condattr_init (&mattr);
  if (pthread_condattr_setpshared (&mattr, PTHREAD_PROCESS_SHARED) != 0)
  {
    /* Function is not supported */
    exit (1);
  }

  /* Get the shared setting to ensure it's correct */
  if (pthread_condattr_getpshared (&mattr, &shared) != 0)
  {
    /* Function is not supported */
    exit (1);
  }

  if (shared == PTHREAD_PROCESS_SHARED)
  {
    /* Supported! */
    exit (0);
  }

  /* Not supported */
  exit (1);
}
],, no_pthread=yes,[echo $ac_n "cross compiling; assumed OK... $ac_c"])
  LIBS="$ac_save_libs"
  if test "x$no_pthread" = x ; then
    pthread_mutex_ok="yes"
    AC_DEFINE(HAVE_PTHREAD_CONDATTR_SETPSHARED, 1,
      [Define wether the pthread_condattr_setpshared is implemented on this platform])
  fi
  AC_MSG_RESULT($pthread_mutex_ok)
])