lwp/preempt.h

   1 /* $Header$ */
   2 /* $Source$ */
   3
   4 #if !defined(lint) && !defined(LOCORE) && defined(RCS_HDRS)
   5 static char *rcsidpreempt = "$Header$";
   6 #endif
   7
   8 /*
   9 ****************************************************************************
  10 *        Copyright IBM Corporation 1988, 1989 - All Rights Reserved        *
  11 *                                                                          *
  12 * Permission to use, copy, modify, and distribute this software and its    *
  13 * documentation for any purpose and without fee is hereby granted,         *
  14 * provided that the above copyright notice appear in all copies and        *
  15 * that both that copyright notice and this permission notice appear in     *
  16 * supporting documentation, and that the name of IBM not be used in        *
  17 * advertising or publicity pertaining to distribution of the software      *
  18 * without specific, written prior permission.                              *
  19 *                                                                          *
  20 * IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL *
  21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL IBM *
  22 * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY      *
  23 * DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER  *
  24 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING   *
  25 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.    *
  26 ****************************************************************************
  27 */
  28
  29 /*******************************************************************\
  30 *                                                                   *
  31 *       Information Technology Center                               *
  32 *       Carnegie-Mellon University                                  *
  33 *                                                                   *
  34 *       Bradley White and M. Satyanarayanan                         *
  35 \*******************************************************************/
  36
  37
  38 #define PRE_PreemptMe()         lwp_cpptr->level = 0
  39 #define PRE_BeginCritical()     lwp_cpptr->level++
  40 #define PRE_EndCritical()       lwp_cpptr->level--
  41
  42 #define DEFAULTSLICE    10
  43
  44 int PRE_InitPreempt(struct timeval *);
  45 int PRE_EndPreempt(void);
  46
  47 extern sig_atomic_t PRE_Block;
  48