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