1 /*
2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2012, 2013 SAP AG. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #ifndef OS_AIX_VM_OSTHREAD_AIX_HPP
27 #define OS_AIX_VM_OSTHREAD_AIX_HPP
28
29 public:
30 typedef pid_t thread_id_t;
31
32 private:
33 int _thread_type;
34
35 public:
36
37 int thread_type() const {
38 return _thread_type;
39 }
40 void set_thread_type(int type) {
41 _thread_type = type;
42 }
43
44 private:
45
46 // _pthread_id is the pthread id, which is used by library calls
47 // (e.g. pthread_kill).
48 pthread_t _pthread_id;
49
50 sigset_t _caller_sigmask; // Caller's signal mask
51
52 public:
53
54 // Methods to save/restore caller's signal mask
55 sigset_t caller_sigmask() const { return _caller_sigmask; }
56 void set_caller_sigmask(sigset_t sigmask) { _caller_sigmask = sigmask; }
57
58 #ifndef PRODUCT
59 // Used for debugging, return a unique integer for each thread.
60 int thread_identifier() const { return _thread_id; }
61 #endif
62 #ifdef ASSERT
63 // We expect no reposition failures so kill vm if we get one.
64 //
65 bool valid_reposition_failure() {
66 return false;
67 }
68 #endif // ASSERT
69 pthread_t pthread_id() const {
70 return _pthread_id;
71 }
72 void set_pthread_id(pthread_t tid) {
73 _pthread_id = tid;
74 }
75
76 // ***************************************************************
77 // suspension support.
78 // ***************************************************************
79
80 public:
81 // flags that support signal based suspend/resume on Linux are in a
82 // separate class to avoid confusion with many flags in OSThread that
83 // are used by VM level suspend/resume.
84 os::SuspendResume sr;
85
86 // _ucontext and _siginfo are used by SR_handler() to save thread context,
87 // and they will later be used to walk the stack or reposition thread PC.
88 // If the thread is not suspended in SR_handler() (e.g. self suspend),
89 // the value in _ucontext is meaningless, so we must use the last Java
90 // frame information as the frame. This will mean that for threads
91 // that are parked on a mutex the profiler (and safepoint mechanism)
92 // will see the thread as if it were still in the Java frame. This
93 // not a problem for the profiler since the Java frame is a close
94 // enough result. For the safepoint mechanism when the give it the
95 // Java frame we are not at a point where the safepoint needs the
96 // frame to that accurate (like for a compiled safepoint) since we
97 // should be in a place where we are native and will block ourselves
98 // if we transition.
99 private:
100 void* _siginfo;
101 ucontext_t* _ucontext;
102 int _expanding_stack; // non zero if manually expanding stack
103 address _alt_sig_stack; // address of base of alternate signal stack
104
105 public:
106 void* siginfo() const { return _siginfo; }
107 void set_siginfo(void* ptr) { _siginfo = ptr; }
108 ucontext_t* ucontext() const { return _ucontext; }
109 void set_ucontext(ucontext_t* ptr) { _ucontext = ptr; }
110 void set_expanding_stack(void) { _expanding_stack = 1; }
111 void clear_expanding_stack(void) { _expanding_stack = 0; }
112 int expanding_stack(void) { return _expanding_stack; }
113
114 void set_alt_sig_stack(address val) { _alt_sig_stack = val; }
115 address alt_sig_stack(void) { return _alt_sig_stack; }
116
117 private:
118 Monitor* _startThread_lock; // sync parent and child in thread creation
119
120 public:
121
122 Monitor* startThread_lock() const {
123 return _startThread_lock;
124 }
125
126 // ***************************************************************
127 // Platform dependent initialization and cleanup
128 // ***************************************************************
129
130 private:
131
132 void pd_initialize();
133 void pd_destroy();
134
135 public:
136
137 // The last measured values of cpu timing to prevent the "stale
138 // value return" bug in thread_cpu_time.
139 volatile struct {
140 jlong sys;
141 jlong user;
142 } _last_cpu_times;
143
144 #endif // OS_AIX_VM_OSTHREAD_AIX_HPP