misc_aix.hpp revision 9665:ce87b1141c12 
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#include "runtime/globals.hpp"
33#include "utilities/debug.hpp"
34
35#include <pthread.h>
36
37// Trace if verbose to tty.
38#define trcVerbose(fmt, ...) { \
39  if (Verbose) { \
40    fprintf(stderr, fmt, ##__VA_ARGS__); \
41    fputc('\n', stderr); fflush(stderr); \
42  } \
43}
44#define ERRBYE(s) { trcVerbose(s); return -1; }
45
46#define assert0(b) assert((b), "")
47#define guarantee0(b) guarantee((b), "")
48template <class T1, class T2> bool is_aligned_to(T1 what, T2 alignment) {
49  return (((uintx)(what)) & (((uintx)(alignment)) - 1)) == 0 ? true : false;
50}
51
52// CritSect: simple critical section implementation using pthread mutexes.
53namespace MiscUtils {
54  typedef pthread_mutex_t critsect_t;
55
56  void init_critsect(MiscUtils::critsect_t* cs);
57  void free_critsect(MiscUtils::critsect_t* cs);
58  void enter_critsect(MiscUtils::critsect_t* cs);
59  void leave_critsect(MiscUtils::critsect_t* cs);
60
61  // Need to wrap this in an object because we need to dynamically initialize
62  // critical section (because of windows, where there is no way to initialize
63  // a CRITICAL_SECTION statically. On Unix, we could use
64  // PTHREAD_MUTEX_INITIALIZER).
65
66  // Note: The critical section does NOT get cleaned up in the destructor. That is
67  // by design: the CritSect class is only ever used as global objects whose
68  // lifetime spans the whole VM life; in that context we don't want the lock to
69  // be cleaned up when global C++ objects are destroyed, but to continue to work
70  // correctly right to the very end of the process life.
71  class CritSect {
72    critsect_t _cs;
73   public:
74    CritSect()        { init_critsect(&_cs); }
75    //~CritSect()       { free_critsect(&_cs); }
76    void enter()      { enter_critsect(&_cs); }
77    void leave()      { leave_critsect(&_cs); }
78  };
79
80  class AutoCritSect {
81    CritSect* const _pcsobj;
82   public:
83    AutoCritSect(CritSect* pcsobj)
84      : _pcsobj(pcsobj)
85    {
86      _pcsobj->enter();
87    }
88    ~AutoCritSect() {
89      _pcsobj->leave();
90    }
91  };
92
93  // Returns true if pointer can be dereferenced without triggering a segment
94  // violation. Returns false if pointer is invalid.
95  // Note: Depends on stub routines; prior to stub routine generation, will
96  // always return true. Use CanUseSafeFetch32 to handle this case.
97  bool is_readable_pointer(const void* p);
98
99}
100
101#endif // OS_AIX_VM_MISC_AIX_HPP
102
103