1/*
2 * Copyright (c) 1999, 2013, 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 public:
28  typedef pid_t thread_id_t;
29
30 private:
31  int _thread_type;
32
33 public:
34
35  int thread_type() const {
36    return _thread_type;
37  }
38  void set_thread_type(int type) {
39    _thread_type = type;
40  }
41
42  // _pthread_id is the pthread id, which is used by library calls
43  // (e.g. pthread_kill).
44  pthread_t _pthread_id;
45
46  sigset_t _caller_sigmask; // Caller's signal mask
47
48 public:
49
50  // Methods to save/restore caller's signal mask
51  sigset_t  caller_sigmask() const       { return _caller_sigmask; }
52  void    set_caller_sigmask(sigset_t sigmask)  { _caller_sigmask = sigmask; }
53
54#ifndef PRODUCT
55  // Used for debugging, return a unique integer for each thread.
56  int thread_identifier() const   { return _thread_id; }
57#endif
58#ifdef ASSERT
59  // We expect no reposition failures so kill vm if we get one.
60  //
61  bool valid_reposition_failure() {
62    return false;
63  }
64#endif // ASSERT
65  pthread_t pthread_id() const {
66    return _pthread_id;
67  }
68  void set_pthread_id(pthread_t tid) {
69    _pthread_id = tid;
70  }
71
72  // ***************************************************************
73  // suspension support.
74  // ***************************************************************
75
76public:
77  // flags that support signal based suspend/resume on Linux are in a
78  // separate class to avoid confusion with many flags in OSThread that
79  // are used by VM level suspend/resume.
80  os::SuspendResume sr;
81
82  // _ucontext and _siginfo are used by SR_handler() to save thread context,
83  // and they will later be used to walk the stack or reposition thread PC.
84  // If the thread is not suspended in SR_handler() (e.g. self suspend),
85  // the value in _ucontext is meaningless, so we must use the last Java
86  // frame information as the frame. This will mean that for threads
87  // that are parked on a mutex the profiler (and safepoint mechanism)
88  // will see the thread as if it were still in the Java frame. This
89  // not a problem for the profiler since the Java frame is a close
90  // enough result. For the safepoint mechanism when the give it the
91  // Java frame we are not at a point where the safepoint needs the
92  // frame to that accurate (like for a compiled safepoint) since we
93  // should be in a place where we are native and will block ourselves
94  // if we transition.
95private:
96  void* _siginfo;
97  ucontext_t* _ucontext;
98  int _expanding_stack;                 /* non zero if manually expanding stack */
99  address _alt_sig_stack;               /* address of base of alternate signal stack */
100
101public:
102  void* siginfo() const                   { return _siginfo;  }
103  void set_siginfo(void* ptr)             { _siginfo = ptr;   }
104  ucontext_t* ucontext() const            { return _ucontext; }
105  void set_ucontext(ucontext_t* ptr)      { _ucontext = ptr;  }
106  void set_expanding_stack(void)          { _expanding_stack = 1;  }
107  void clear_expanding_stack(void)        { _expanding_stack = 0;  }
108  int  expanding_stack(void)              { return _expanding_stack;  }
109
110  void set_alt_sig_stack(address val)     { _alt_sig_stack = val; }
111  address alt_sig_stack(void)             { return _alt_sig_stack; }
112
113private:
114  Monitor* _startThread_lock;     // sync parent and child in thread creation
115
116public:
117
118  Monitor* startThread_lock() const {
119    return _startThread_lock;
120  }
121
122  // ***************************************************************
123  // Platform dependent initialization and cleanup
124  // ***************************************************************
125
126private:
127
128  void pd_initialize();
129  void pd_destroy();
130
131// Reconciliation History
132// osThread_solaris.hpp 1.24 99/08/27 13:11:54
133// End
134
135#endif // OS_LINUX_VM_OSTHREAD_LINUX_HPP
136