osThread_linux.hpp revision 0:a61af66fc99e 
1/*
2 * Copyright 1999-2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 private:
26  int _thread_type;
27
28 public:
29
30  int thread_type() const {
31    return _thread_type;
32  }
33  void set_thread_type(int type) {
34    _thread_type = type;
35  }
36
37 private:
38
39  // _thread_id is kernel thread id (similar to LWP id on Solaris). Each
40  // thread has a unique thread_id (LinuxThreads or NPTL). It can be used
41  // to access /proc.
42  pid_t     _thread_id;
43
44  // _pthread_id is the pthread id, which is used by library calls
45  // (e.g. pthread_kill).
46  pthread_t _pthread_id;
47
48  sigset_t _caller_sigmask; // Caller's signal mask
49
50 public:
51
52  // Methods to save/restore caller's signal mask
53  sigset_t  caller_sigmask() const       { return _caller_sigmask; }
54  void    set_caller_sigmask(sigset_t sigmask)  { _caller_sigmask = sigmask; }
55
56  pid_t thread_id() const {
57    return _thread_id;
58  }
59#ifndef PRODUCT
60  // Used for debugging, return a unique integer for each thread.
61  int thread_identifier() const   { return _thread_id; }
62#endif
63#ifdef ASSERT
64  // We expect no reposition failures so kill vm if we get one.
65  //
66  bool valid_reposition_failure() {
67    return false;
68  }
69#endif // ASSERT
70  void set_thread_id(pid_t id) {
71    _thread_id = id;
72  }
73  pthread_t pthread_id() const {
74    return _pthread_id;
75  }
76  void set_pthread_id(pthread_t tid) {
77    _pthread_id = tid;
78  }
79
80  // ***************************************************************
81  // suspension support.
82  // ***************************************************************
83
84public:
85  // flags that support signal based suspend/resume on Linux are in a
86  // separate class to avoid confusion with many flags in OSThread that
87  // are used by VM level suspend/resume.
88  os::Linux::SuspendResume sr;
89
90  // _ucontext and _siginfo are used by SR_handler() to save thread context,
91  // and they will later be used to walk the stack or reposition thread PC.
92  // If the thread is not suspended in SR_handler() (e.g. self suspend),
93  // the value in _ucontext is meaningless, so we must use the last Java
94  // frame information as the frame. This will mean that for threads
95  // that are parked on a mutex the profiler (and safepoint mechanism)
96  // will see the thread as if it were still in the Java frame. This
97  // not a problem for the profiler since the Java frame is a close
98  // enough result. For the safepoint mechanism when the give it the
99  // Java frame we are not at a point where the safepoint needs the
100  // frame to that accurate (like for a compiled safepoint) since we
101  // should be in a place where we are native and will block ourselves
102  // if we transition.
103private:
104  void* _siginfo;
105  ucontext_t* _ucontext;
106  int _expanding_stack;                 /* non zero if manually expanding stack */
107  address _alt_sig_stack;               /* address of base of alternate signal stack */
108
109public:
110  void* siginfo() const                   { return _siginfo;  }
111  void set_siginfo(void* ptr)             { _siginfo = ptr;   }
112  ucontext_t* ucontext() const            { return _ucontext; }
113  void set_ucontext(ucontext_t* ptr)      { _ucontext = ptr;  }
114  void set_expanding_stack(void)          { _expanding_stack = 1;  }
115  void clear_expanding_stack(void)        { _expanding_stack = 0;  }
116  int  expanding_stack(void)              { return _expanding_stack;  }
117
118  void set_alt_sig_stack(address val)     { _alt_sig_stack = val; }
119  address alt_sig_stack(void)             { return _alt_sig_stack; }
120
121private:
122  Monitor* _startThread_lock;     // sync parent and child in thread creation
123
124public:
125
126  Monitor* startThread_lock() const {
127    return _startThread_lock;
128  }
129
130  // ***************************************************************
131  // Platform dependent initialization and cleanup
132  // ***************************************************************
133
134private:
135
136  void pd_initialize();
137  void pd_destroy();
138
139// Reconciliation History
140// osThread_solaris.hpp 1.24 99/08/27 13:11:54
141// End
142