1/*
2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2013 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
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24 */
25
26#ifndef OS_AIX_VM_OSTHREAD_AIX_HPP
27#define OS_AIX_VM_OSTHREAD_AIX_HPP
28
29 public:
30  typedef pthread_t thread_id_t;
31
32 private:
33  int _thread_type;
34
35 public:
36
37  int thread_type() const {
38    return _thread_type;
39  }
40  void set_thread_type(int type) {
41    _thread_type = type;
42  }
43
44 private:
45
46  // On AIX, we use the pthread id as OSThread::thread_id and keep the kernel thread id
47  // separately for diagnostic purposes.
48  //
49  // Note: this kernel thread id is saved at thread start. Depending on the
50  // AIX scheduling mode, this may not be the current thread id (usually not
51  // a problem though as we run with AIXTHREAD_SCOPE=S).
52  tid_t _kernel_thread_id;
53
54  sigset_t _caller_sigmask; // Caller's signal mask
55
56 public:
57
58  // Methods to save/restore caller's signal mask
59  sigset_t  caller_sigmask() const       { return _caller_sigmask; }
60  void    set_caller_sigmask(sigset_t sigmask)  { _caller_sigmask = sigmask; }
61
62#ifndef PRODUCT
63  // Used for debugging, return a unique integer for each thread.
64  int thread_identifier() const   { return _thread_id; }
65#endif
66#ifdef ASSERT
67  // We expect no reposition failures so kill vm if we get one.
68  //
69  bool valid_reposition_failure() {
70    return false;
71  }
72#endif // ASSERT
73  tid_t kernel_thread_id() const {
74    return _kernel_thread_id;
75  }
76  void set_kernel_thread_id(tid_t tid) {
77    _kernel_thread_id = tid;
78  }
79
80  pthread_t pthread_id() const {
81    // Here: same as OSThread::thread_id()
82    return _thread_id;
83  }
84
85  // ***************************************************************
86  // suspension support.
87  // ***************************************************************
88
89 public:
90  // flags that support signal based suspend/resume on Aix are in a
91  // separate class to avoid confusion with many flags in OSThread that
92  // are used by VM level suspend/resume.
93  os::SuspendResume sr;
94
95  // _ucontext and _siginfo are used by SR_handler() to save thread context,
96  // and they will later be used to walk the stack or reposition thread PC.
97  // If the thread is not suspended in SR_handler() (e.g. self suspend),
98  // the value in _ucontext is meaningless, so we must use the last Java
99  // frame information as the frame. This will mean that for threads
100  // that are parked on a mutex the profiler (and safepoint mechanism)
101  // will see the thread as if it were still in the Java frame. This
102  // not a problem for the profiler since the Java frame is a close
103  // enough result. For the safepoint mechanism when the give it the
104  // Java frame we are not at a point where the safepoint needs the
105  // frame to that accurate (like for a compiled safepoint) since we
106  // should be in a place where we are native and will block ourselves
107  // if we transition.
108 private:
109  void* _siginfo;
110  ucontext_t* _ucontext;
111  int _expanding_stack;                 // non zero if manually expanding stack
112  address _alt_sig_stack;               // address of base of alternate signal stack
113
114 public:
115  void* siginfo() const                   { return _siginfo;  }
116  void set_siginfo(void* ptr)             { _siginfo = ptr;   }
117  ucontext_t* ucontext() const            { return _ucontext; }
118  void set_ucontext(ucontext_t* ptr)      { _ucontext = ptr;  }
119  void set_expanding_stack(void)          { _expanding_stack = 1;  }
120  void clear_expanding_stack(void)        { _expanding_stack = 0;  }
121  int  expanding_stack(void)              { return _expanding_stack;  }
122
123  void set_alt_sig_stack(address val)     { _alt_sig_stack = val; }
124  address alt_sig_stack(void)             { return _alt_sig_stack; }
125
126 private:
127  Monitor* _startThread_lock;     // sync parent and child in thread creation
128
129 public:
130
131  Monitor* startThread_lock() const {
132    return _startThread_lock;
133  }
134
135  // ***************************************************************
136  // Platform dependent initialization and cleanup
137  // ***************************************************************
138
139 private:
140
141  void pd_initialize();
142  void pd_destroy();
143
144 public:
145
146  // The last measured values of cpu timing to prevent the "stale
147  // value return" bug in thread_cpu_time.
148  volatile struct {
149    jlong sys;
150    jlong user;
151  } _last_cpu_times;
152
153#endif // OS_AIX_VM_OSTHREAD_AIX_HPP
154