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
87 public:
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.
106 private:
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
112 public:
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
124 private:
125 Monitor* _startThread_lock; // sync parent and child in thread creation
126
127 public:
128
129 Monitor* startThread_lock() const {
130 return _startThread_lock;
131 }
132
133 // ***************************************************************
134 // Platform dependent initialization and cleanup
135 // ***************************************************************
136
137 private:
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