rev 9449 : 8143125-Further Developments for AIX

   1 /*
   2  * Copyright 2012, 2015 SAP AG. 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 
  26 #ifndef OS_AIX_VM_MISC_AIX_HPP
  27 #define OS_AIX_VM_MISC_AIX_HPP
  28 
  29 // misc_aix.hpp, misc_aix.cpp: convenience functions needed for the OpenJDK AIX
  30 // port.
  31 #include "utilities/globalDefinitions.hpp"


  32 
  33 #include <pthread.h>
  34 
  35 // Trace if verbose to tty.
  36 #define trcVerbose(fmt, ...) { \
  37   if (Verbose) { \
  38     fprintf(stderr, fmt, ##__VA_ARGS__); \
  39     fputc('\n', stderr); fflush(stderr); \
  40   } \
  41 }
  42 #define ERRBYE(s) { trcVerbose(s); return -1; }
  43 #define trc(fmt, ...)
  44 
  45 #define assert0(b) assert((b), "")
  46 #define guarantee0(b) guarantee((b), "")
  47 template <class T1, class T2> bool is_aligned_to(T1 what, T2 alignment) {
  48   return (((uintx)(what)) & (((uintx)(alignment)) - 1)) == 0 ? true : false;
  49 }
  50 
  51 // CritSect: simple critical section implementation using pthread mutexes.
  52 namespace MiscUtils {
  53   typedef pthread_mutex_t critsect_t;
  54 
  55   void init_critsect(MiscUtils::critsect_t* cs);
  56   void free_critsect(MiscUtils::critsect_t* cs);
  57   void enter_critsect(MiscUtils::critsect_t* cs);
  58   void leave_critsect(MiscUtils::critsect_t* cs);
  59 
  60   // Need to wrap this in an object because we need to dynamically initialize
  61   // critical section (because of windows, where there is no way to initialize
  62   // a CRITICAL_SECTION statically. On Unix, we could use
  63   // PTHREAD_MUTEX_INITIALIZER).
  64 
  65   // Note: The critical section does NOT get cleaned up in the destructor. That is
  66   // by design: the CritSect class is only ever used as global objects whose
  67   // lifetime spans the whole VM life; in that context we don't want the lock to
  68   // be cleaned up when global C++ objects are destroyed, but to continue to work
  69   // correctly right to the very end of the process life.
  70   class CritSect {
  71     critsect_t _cs;
  72    public:
  73     CritSect()        { init_critsect(&_cs); }
  74     //~CritSect()       { free_critsect(&_cs); }
  75     void enter()      { enter_critsect(&_cs); }
  76     void leave()      { leave_critsect(&_cs); }
  77   };
  78 
  79   class AutoCritSect {
  80     CritSect* const _pcsobj;
  81    public:
  82     AutoCritSect(CritSect* pcsobj)
  83       : _pcsobj(pcsobj)
  84     {
  85       _pcsobj->enter();
  86     }
  87     ~AutoCritSect() {
  88       _pcsobj->leave();
  89     }
  90   };
  91 
  92   // Returns true if pointer can be dereferenced without triggering a segment
  93   // violation. Returns false if pointer is invalid.
  94   // Note: Depends on stub routines; prior to stub routine generation, will
  95   // always return true. Use CanUseSafeFetch32 to handle this case.
  96   bool is_readable_pointer(const void* p);




  97 
  98 }
  99 
 100 #endif // OS_AIX_VM_MISC_AIX_HPP
 101 
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