| |
| /*--------------------------------------------------------------------*/ |
| /*--- Generic scheduler lock implementation sched-lock-generic.c ---*/ |
| /*--- ---*/ |
| /*--- This implementation does not guarantee fair scheduling on ---*/ |
| /*--- multicore systems but is sufficient to make the Valgrind ---*/ |
| /*--- scheduler work reasonably. ---*/ |
| /*--------------------------------------------------------------------*/ |
| |
| /* |
| This file is part of Valgrind, a dynamic binary instrumentation |
| framework. |
| |
| Copyright (C) 2011 Bart Van Assche <bvanassche@acm.org>. |
| |
| This program is free software; you can redistribute it and/or |
| modify it under the terms of the GNU General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307, USA. |
| |
| The GNU General Public License is contained in the file COPYING. |
| */ |
| |
| #include "pub_core_basics.h" |
| #include "pub_tool_mallocfree.h" |
| #include "priv_sema.h" |
| #include "priv_sched-lock.h" |
| #include "priv_sched-lock-impl.h" |
| |
| struct sched_lock { |
| vg_sema_t sema; |
| }; |
| |
| static const Char *get_sched_lock_name(void) |
| { |
| return "generic"; |
| } |
| |
| static struct sched_lock *create_sched_lock(void) |
| { |
| struct sched_lock *p; |
| |
| p = VG_(malloc)("sched_lock", sizeof(*p)); |
| if (p) |
| ML_(sema_init)(&p->sema); |
| return p; |
| } |
| |
| static void destroy_sched_lock(struct sched_lock *p) |
| { |
| ML_(sema_deinit)(&p->sema); |
| VG_(free)(p); |
| } |
| |
| static int get_sched_lock_owner(struct sched_lock *p) |
| { |
| return p->sema.owner_lwpid; |
| } |
| |
| static void acquire_sched_lock(struct sched_lock *p) |
| { |
| ML_(sema_down)(&p->sema, False); |
| } |
| |
| static void release_sched_lock(struct sched_lock *p) |
| { |
| ML_(sema_up)(&p->sema, False); |
| } |
| |
| const struct sched_lock_ops ML_(generic_sched_lock_ops) = { |
| .get_sched_lock_name = get_sched_lock_name, |
| .create_sched_lock = create_sched_lock, |
| .destroy_sched_lock = destroy_sched_lock, |
| .get_sched_lock_owner = get_sched_lock_owner, |
| .acquire_sched_lock = acquire_sched_lock, |
| .release_sched_lock = release_sched_lock, |
| }; |