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) 2011-2017 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, see <http://www.gnu.org/licenses/>.
  24
  25    The GNU General Public License is contained in the file COPYING.
  26 */
  27
  28 #include "config.h"
  29 #include "pub_core_basics.h"
  30 #include "pub_core_libcbase.h"
  31 #include "pub_core_mallocfree.h"
  32 #include "priv_sema.h"
  33 #include "priv_sched-lock.h"
  34 #include "priv_sched-lock-impl.h"
  35
  36 static struct sched_lock_ops const *sched_lock_ops =
  37    &ML_(generic_sched_lock_ops);
  38
  39 static struct sched_lock_ops const *const sched_lock_impl[] = {
  40    [sched_lock_generic] = &ML_(generic_sched_lock_ops),
  41 #ifdef ENABLE_LINUX_TICKET_LOCK
  42    [sched_lock_ticket]  = &ML_(linux_ticket_lock_ops),
  43 #endif
  44 };
  45
  46 /**
  47  * Define which scheduler lock implementation to use.
  48  *
  49  * @param[in] t Scheduler lock type.
  50  *
  51  * @return True if and only if this function succeeded.
  52  *
  53  * @note Must be called before any other sched_lock*() function is invoked.
  54  */
  55 Bool ML_(set_sched_lock_impl)(const enum SchedLockType t)
  56 {
  57    struct sched_lock_ops const *p = NULL;
  58
  59    if ((unsigned)t < sizeof(sched_lock_impl)/sizeof(sched_lock_impl[0]))
  60       p = sched_lock_impl[t];
  61    if (p)
  62       sched_lock_ops = p;
  63    return !!p;
  64 }
  65
  66 const HChar *ML_(get_sched_lock_name)(void)
  67 {
  68    return (sched_lock_ops->get_sched_lock_name)();
  69 }
  70
  71 struct sched_lock *ML_(create_sched_lock)(void)
  72 {
  73    return (sched_lock_ops->create_sched_lock)();
  74 }
  75
  76 void ML_(destroy_sched_lock)(struct sched_lock *p)
  77 {
  78    return (sched_lock_ops->destroy_sched_lock)(p);
  79 }
  80
  81 int ML_(get_sched_lock_owner)(struct sched_lock *p)
  82 {
  83    return (sched_lock_ops->get_sched_lock_owner)(p);
  84 }
  85
  86 void ML_(acquire_sched_lock)(struct sched_lock *p)
  87 {
  88    return (sched_lock_ops->acquire_sched_lock)(p);
  89 }
  90
  91 void ML_(release_sched_lock)(struct sched_lock *p)
  92 {
  93    return (sched_lock_ops->release_sched_lock)(p);
  94 }