osThread_linux.hpp revision 1879:f95d63e2154a 
1/*
2 * Copyright (c) 1999, 2010, 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_LINUX_VM_OSTHREAD_LINUX_HPP
26#define OS_LINUX_VM_OSTHREAD_LINUX_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  // _thread_id is kernel thread id (similar to LWP id on Solaris). Each
43  // thread has a unique thread_id (LinuxThreads or NPTL). It can be used
44  // to access /proc.
45  pid_t     _thread_id;
46
47  // _pthread_id is the pthread id, which is used by library calls
48  // (e.g. pthread_kill).
49  pthread_t _pthread_id;
50
51  sigset_t _caller_sigmask; // Caller's signal mask
52
53 public:
54
55  // Methods to save/restore caller's signal mask
56  sigset_t  caller_sigmask() const       { return _caller_sigmask; }
57  void    set_caller_sigmask(sigset_t sigmask)  { _caller_sigmask = sigmask; }
58
59  pid_t thread_id() const {
60    return _thread_id;
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  void set_thread_id(pid_t id) {
74    _thread_id = id;
75  }
76  pthread_t pthread_id() const {
77    return _pthread_id;
78  }
79  void set_pthread_id(pthread_t tid) {
80    _pthread_id = tid;
81  }
82
83  // ***************************************************************
84  // suspension support.
85  // ***************************************************************
86
87public:
88  // flags that support signal based suspend/resume on Linux are in a
89  // separate class to avoid confusion with many flags in OSThread that
90  // are used by VM level suspend/resume.
91  os::Linux::SuspendResume sr;
92
93  // _ucontext and _siginfo are used by SR_handler() to save thread context,
94  // and they will later be used to walk the stack or reposition thread PC.
95  // If the thread is not suspended in SR_handler() (e.g. self suspend),
96  // the value in _ucontext is meaningless, so we must use the last Java
97  // frame information as the frame. This will mean that for threads
98  // that are parked on a mutex the profiler (and safepoint mechanism)
99  // will see the thread as if it were still in the Java frame. This
100  // not a problem for the profiler since the Java frame is a close
101  // enough result. For the safepoint mechanism when the give it the
102  // Java frame we are not at a point where the safepoint needs the
103  // frame to that accurate (like for a compiled safepoint) since we
104  // should be in a place where we are native and will block ourselves
105  // if we transition.
106private:
107  void* _siginfo;
108  ucontext_t* _ucontext;
109  int _expanding_stack;                 /* non zero if manually expanding stack */
110  address _alt_sig_stack;               /* address of base of alternate signal stack */
111
112public:
113  void* siginfo() const                   { return _siginfo;  }
114  void set_siginfo(void* ptr)             { _siginfo = ptr;   }
115  ucontext_t* ucontext() const            { return _ucontext; }
116  void set_ucontext(ucontext_t* ptr)      { _ucontext = ptr;  }
117  void set_expanding_stack(void)          { _expanding_stack = 1;  }
118  void clear_expanding_stack(void)        { _expanding_stack = 0;  }
119  int  expanding_stack(void)              { return _expanding_stack;  }
120
121  void set_alt_sig_stack(address val)     { _alt_sig_stack = val; }
122  address alt_sig_stack(void)             { return _alt_sig_stack; }
123
124private:
125  Monitor* _startThread_lock;     // sync parent and child in thread creation
126
127public:
128
129  Monitor* startThread_lock() const {
130    return _startThread_lock;
131  }
132
133  // ***************************************************************
134  // Platform dependent initialization and cleanup
135  // ***************************************************************
136
137private:
138
139  void pd_initialize();
140  void pd_destroy();
141
142// Reconciliation History
143// osThread_solaris.hpp 1.24 99/08/27 13:11:54
144// End
145
146#endif // OS_LINUX_VM_OSTHREAD_LINUX_HPP
147