coregrind/m_scheduler/priv_sema.h

   1
   2 /*--------------------------------------------------------------------*/
   3 /*--- Private scheduler header.                        priv_sema.h ---*/
   4 /*--------------------------------------------------------------------*/
   5
   6 /*
   7    This file is part of Valgrind, a dynamic binary instrumentation
   8    framework.
   9
  10    Copyright (C) 2000-2017 Julian Seward
  11       jseward@acm.org
  12
  13    This program is free software; you can redistribute it and/or
  14    modify it under the terms of the GNU General Public License as
  15    published by the Free Software Foundation; either version 2 of the
  16    License, or (at your option) any later version.
  17
  18    This program is distributed in the hope that it will be useful, but
  19    WITHOUT ANY WARRANTY; without even the implied warranty of
  20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21    General Public License for more details.
  22
  23    You should have received a copy of the GNU General Public License
  24    along with this program; if not, see <http://www.gnu.org/licenses/>.
  25
  26    The GNU General Public License is contained in the file COPYING.
  27 */
  28
  29 #ifndef __PRIV_SEMA_H
  30 #define __PRIV_SEMA_H
  31
  32 #include "pub_core_basics.h"   // Bool
  33
  34 /* Not really a semaphore, but use a pipe for a token-passing scheme */
  35 typedef struct {
  36    Int  pipe[2];
  37    Int  owner_lwpid;  /* who currently has it */
  38    Bool held_as_LL;   /* if held, True == held by a _LL call */
  39 } vg_sema_t;
  40
  41 // Nb: this may be OS-specific, but let's not factor it out until we
  42 // implement an OS port for which this isn't ok.
  43 void ML_(sema_init)   ( vg_sema_t *sema );
  44 void ML_(sema_deinit) ( vg_sema_t *sema );
  45 void ML_(sema_down)   ( vg_sema_t *sema, Bool as_LL );
  46 void ML_(sema_up)     ( vg_sema_t *sema, Bool as_LL );
  47
  48 #endif   // __PRIV_SEMA_H
  49
  50 /*--------------------------------------------------------------------*/
  51 /*--- end                                                          ---*/
  52 /*--------------------------------------------------------------------*/
  53