1 /*
   2  * Copyright (c) 2015 SAP SE. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "misc_aix.hpp"
  26 #include "runtime/stubRoutines.hpp"
  27 
  28 #include <pthread.h>
  29 #include <unistd.h>
  30 #include <errno.h>
  31 
  32 void MiscUtils::init_critsect(MiscUtils::critsect_t* cs) {
  33   const int rc = pthread_mutex_init(cs, NULL);
  34   assert0(rc == 0);
  35 }
  36 
  37 void MiscUtils::free_critsect(MiscUtils::critsect_t* cs) {
  38   const int rc = pthread_mutex_destroy(cs);
  39   assert0(rc == 0);
  40 }
  41 
  42 void MiscUtils::enter_critsect(MiscUtils::critsect_t* cs) {
  43   const int rc = pthread_mutex_lock(cs);
  44   assert0(rc == 0);
  45 }
  46 
  47 void MiscUtils::leave_critsect(MiscUtils::critsect_t* cs) {
  48   const int rc = pthread_mutex_unlock(cs);
  49   assert0(rc == 0);
  50 }
  51 
  52 bool MiscUtils::is_readable_pointer(const void* p) {
  53   if (!CanUseSafeFetch32()) {
  54     return true;
  55   }
  56   int* const aligned = (int*) align_ptr_down(p, 4);
  57   int cafebabe = 0xcafebabe;
  58   int deadbeef = 0xdeadbeef;
  59   return (SafeFetch32(aligned, cafebabe) != cafebabe) ||
  60          (SafeFetch32(aligned, deadbeef) != deadbeef);
  61 }
  62 
  63