osThread_bsd.hpp revision 3152:0368109684cb 
1/*
2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. 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#ifndef OS_BSD_VM_OSTHREAD_BSD_HPP
26#define OS_BSD_VM_OSTHREAD_BSD_HPP
27
28 private:
29  int _thread_type;
30
31 public:
32
33  int thread_type() const {
34    return _thread_type;
35  }
36  void set_thread_type(int type) {
37    _thread_type = type;
38  }
39
40 private:
41
42#ifdef _ALLBSD_SOURCE
43
44#ifdef __APPLE__
45  thread_t  _thread_id;
46#else
47  pthread_t _thread_id;
48#endif
49
50  // _pthread_id is the pthread id, which is used by library calls
51  // (e.g. pthread_kill).
52  pthread_t _pthread_id;
53
54#else
55  // _thread_id is kernel thread id (similar to LWP id on Solaris). Each
56  // thread has a unique thread_id (BsdThreads or NPTL). It can be used
57  // to access /proc.
58  pid_t     _thread_id;
59
60  // _pthread_id is the pthread id, which is used by library calls
61  // (e.g. pthread_kill).
62  pthread_t _pthread_id;
63#endif
64
65  sigset_t _caller_sigmask; // Caller's signal mask
66
67 public:
68
69  // Methods to save/restore caller's signal mask
70  sigset_t  caller_sigmask() const       { return _caller_sigmask; }
71  void    set_caller_sigmask(sigset_t sigmask)  { _caller_sigmask = sigmask; }
72
73#ifdef _ALLBSD_SOURCE
74#ifdef __APPLE__
75  thread_t thread_id() const {
76    return _thread_id;
77  }
78#else
79  pthread_t thread_id() const {
80    return _thread_id;
81  }
82#endif
83#else
84  pid_t thread_id() const {
85    return _thread_id;
86  }
87#endif
88#ifndef PRODUCT
89  // Used for debugging, return a unique integer for each thread.
90  intptr_t thread_identifier() const   { return (intptr_t)_pthread_id; }
91#endif
92#ifdef ASSERT
93  // We expect no reposition failures so kill vm if we get one.
94  //
95  bool valid_reposition_failure() {
96    return false;
97  }
98#endif // ASSERT
99#ifdef _ALLBSD_SOURCE
100#ifdef __APPLE__
101  void set_thread_id(thread_t id) {
102    _thread_id = id;
103  }
104#else
105  void set_thread_id(pthread_t id) {
106    _thread_id = id;
107  }
108#endif
109#else
110  void set_thread_id(pid_t id) {
111    _thread_id = id;
112  }
113#endif
114  pthread_t pthread_id() const {
115    return _pthread_id;
116  }
117  void set_pthread_id(pthread_t tid) {
118    _pthread_id = tid;
119  }
120
121  // ***************************************************************
122  // suspension support.
123  // ***************************************************************
124
125public:
126  // flags that support signal based suspend/resume on Bsd are in a
127  // separate class to avoid confusion with many flags in OSThread that
128  // are used by VM level suspend/resume.
129  os::Bsd::SuspendResume sr;
130
131  // _ucontext and _siginfo are used by SR_handler() to save thread context,
132  // and they will later be used to walk the stack or reposition thread PC.
133  // If the thread is not suspended in SR_handler() (e.g. self suspend),
134  // the value in _ucontext is meaningless, so we must use the last Java
135  // frame information as the frame. This will mean that for threads
136  // that are parked on a mutex the profiler (and safepoint mechanism)
137  // will see the thread as if it were still in the Java frame. This
138  // not a problem for the profiler since the Java frame is a close
139  // enough result. For the safepoint mechanism when the give it the
140  // Java frame we are not at a point where the safepoint needs the
141  // frame to that accurate (like for a compiled safepoint) since we
142  // should be in a place where we are native and will block ourselves
143  // if we transition.
144private:
145  void* _siginfo;
146  ucontext_t* _ucontext;
147  int _expanding_stack;                 /* non zero if manually expanding stack */
148  address _alt_sig_stack;               /* address of base of alternate signal stack */
149
150public:
151  void* siginfo() const                   { return _siginfo;  }
152  void set_siginfo(void* ptr)             { _siginfo = ptr;   }
153  ucontext_t* ucontext() const            { return _ucontext; }
154  void set_ucontext(ucontext_t* ptr)      { _ucontext = ptr;  }
155  void set_expanding_stack(void)          { _expanding_stack = 1;  }
156  void clear_expanding_stack(void)        { _expanding_stack = 0;  }
157  int  expanding_stack(void)              { return _expanding_stack;  }
158
159  void set_alt_sig_stack(address val)     { _alt_sig_stack = val; }
160  address alt_sig_stack(void)             { return _alt_sig_stack; }
161
162private:
163  Monitor* _startThread_lock;     // sync parent and child in thread creation
164
165public:
166
167  Monitor* startThread_lock() const {
168    return _startThread_lock;
169  }
170
171  // ***************************************************************
172  // Platform dependent initialization and cleanup
173  // ***************************************************************
174
175private:
176
177  void pd_initialize();
178  void pd_destroy();
179
180// Reconciliation History
181// osThread_solaris.hpp 1.24 99/08/27 13:11:54
182// End
183
184#endif // OS_BSD_VM_OSTHREAD_BSD_HPP
185