# PTHREAD_SET_NAME();
# Check which variant (if any) of pthread_set_name_np we have.
# -----------------------------------------------------------------------------
AC_DEFUN([PTHREAD_SET_NAME],
[
  stored_LIBS="$LIBS"
  LIBS="-lpthread"
  # pthread setname (4 non-portable variants...)
  AC_CHECK_HEADERS([pthread_np.h], [], [], [#include <pthread.h>])
  define(pthread_np_preamble,[
    #include <pthread.h>
    #if HAVE_PTHREAD_NP_H
    #  include <pthread_np.h>
    #endif
  ])
  # 2-arg setname (e.g. Linux/glibc, QNX, IBM)
  AC_MSG_CHECKING([for 2-arg pthread_setname_np])
  AC_LINK_IFELSE([AC_LANG_PROGRAM(pthread_np_preamble, [
      pthread_setname_np(pthread_self(), "foo")
  ])], [
    AC_DEFINE(HAVE_PTHREAD_SETNAME_NP_2, 1, [2-arg pthread_setname_np])
    AC_MSG_RESULT([yes])
  ], [
    AC_MSG_RESULT([no])

    # 2-arg set_name (e.g. FreeBSD, OpenBSD)
    AC_MSG_CHECKING([for 2-arg pthread_set_name_np])
    AC_LINK_IFELSE([AC_LANG_PROGRAM(pthread_np_preamble, [
        return pthread_set_name_np(pthread_self(), "foo");
    ])], [
      AC_DEFINE(HAVE_PTHREAD_SET_NAME_NP_2, 1, [2-arg pthread_set_name_np])
      AC_MSG_RESULT([yes])
    ], [
      AC_MSG_RESULT([no])

      # 2-arg void set_name (e.g. FreeBSD, OpenBSD)
      AC_MSG_CHECKING([for 2-arg void pthread_set_name_np])
      AC_LINK_IFELSE([AC_LANG_PROGRAM(pthread_np_preamble, [
          pthread_set_name_np(pthread_self(), "foo");
      ])], [
        AC_DEFINE(HAVE_PTHREAD_SET_NAME_NP_2_VOID, 1, [2-arg void pthread_set_name_np])
        AC_MSG_RESULT([yes])
      ], [
        AC_MSG_RESULT([no])

        # 1-arg setname (e.g. Darwin)
        AC_MSG_CHECKING([for 1-arg pthread_setname_np])
        AC_LINK_IFELSE([AC_LANG_PROGRAM(pthread_np_preamble, [
            return pthread_setname_np("foo");
        ])], [
          AC_DEFINE(HAVE_PTHREAD_SETNAME_NP_1, 1, [1-arg pthread_setname_np])
          AC_MSG_RESULT([yes])
        ], [
          AC_MSG_RESULT([no])

          # 3-arg setname (e.g. NetBSD)
          AC_MSG_CHECKING([for 3-arg pthread_setname_np])
          AC_LINK_IFELSE([AC_LANG_PROGRAM(pthread_np_preamble, [
              return pthread_setname_np(pthread_self(), "foo", NULL);
          ])], [
            AC_DEFINE(HAVE_PTHREAD_SETNAME_NP_3, 1, [3-arg pthread_setname_np])
            AC_MSG_RESULT([yes])
          ], [
            AC_MSG_RESULT([no])
          ])
        ])
      ])
    ])
  ])
  LIBS=$stored_LIBS
])