coregrind/m_scheduler/sched-lock.c

   1
   2 /*--------------------------------------------------------------------*/
   3 /*--- Scheduler lock support functions                sched-lock.c ---*/
   4 /*--------------------------------------------------------------------*/
   5
   6 /*
   7    This file is part of Valgrind, a dynamic binary instrumentation
   8    framework.
   9
  10    Copyright (C) 2011-2013 Bart Van Assche <bvanassche@acm.org>.
  11
  12    This program is free software; you can redistribute it and/or
  13    modify it under the terms of the GNU General Public License as
  14    published by the Free Software Foundation; either version 2 of the
  15    License, or (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful, but
  18    WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20    General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program; if not, write to the Free Software
  24    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  25    02111-1307, USA.
  26
  27    The GNU General Public License is contained in the file COPYING.
  28 */
  29
  30 #include "config.h"
  31 #include "pub_core_basics.h"
  32 #include "pub_core_libcbase.h"
  33 #include "pub_core_mallocfree.h"
  34 #include "priv_sema.h"
  35 #include "priv_sched-lock.h"
  36 #include "priv_sched-lock-impl.h"
  37
  38 static struct sched_lock_ops const *sched_lock_ops =
  39    &ML_(generic_sched_lock_ops);
  40
  41 static struct sched_lock_ops const *const sched_lock_impl[] = {
  42    [sched_lock_generic] = &ML_(generic_sched_lock_ops),
  43 #ifdef ENABLE_LINUX_TICKET_LOCK
  44    [sched_lock_ticket]  = &ML_(linux_ticket_lock_ops),
  45 #endif
  46 };
  47
  48 /**
  49  * Define which scheduler lock implementation to use.
  50  *
  51  * @param[in] t Scheduler lock type.
  52  *
  53  * @return True if and only if this function succeeded.
  54  *
  55  * @note Must be called before any other sched_lock*() function is invoked.
  56  */
  57 Bool ML_(set_sched_lock_impl)(const enum SchedLockType t)
  58 {
  59    struct sched_lock_ops const *p = NULL;
  60
  61    if ((unsigned)t < sizeof(sched_lock_impl)/sizeof(sched_lock_impl[0]))
  62       p = sched_lock_impl[t];
  63    if (p)
  64       sched_lock_ops = p;
  65    return !!p;
  66 }
  67
  68 const HChar *ML_(get_sched_lock_name)(void)
  69 {
  70    return (sched_lock_ops->get_sched_lock_name)();
  71 }
  72
  73 struct sched_lock *ML_(create_sched_lock)(void)
  74 {
  75    return (sched_lock_ops->create_sched_lock)();
  76 }
  77
  78 void ML_(destroy_sched_lock)(struct sched_lock *p)
  79 {
  80    return (sched_lock_ops->destroy_sched_lock)(p);
  81 }
  82
  83 int ML_(get_sched_lock_owner)(struct sched_lock *p)
  84 {
  85    return (sched_lock_ops->get_sched_lock_owner)(p);
  86 }
  87
  88 void ML_(acquire_sched_lock)(struct sched_lock *p)
  89 {
  90    return (sched_lock_ops->acquire_sched_lock)(p);
  91 }
  92
  93 void ML_(release_sched_lock)(struct sched_lock *p)
  94 {
  95    return (sched_lock_ops->release_sched_lock)(p);
  96 }