1 /*
2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2013 SAP SE. 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 pthread_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 // On AIX, we use the pthread id as OSThread::thread_id and keep the kernel thread id
47 // separately for diagnostic purposes.
48 //
49 // Note: this kernel thread id is saved at thread start. Depending on the
50 // AIX scheduling mode, this may not be the current thread id (usually not
51 // a problem though as we run with AIXTHREAD_SCOPE=S).
52 tid_t _kernel_thread_id;
53
54 sigset_t _caller_sigmask; // Caller's signal mask
55
56 public:
57
58 // Methods to save/restore caller's signal mask
59 sigset_t caller_sigmask() const { return _caller_sigmask; }
60 void set_caller_sigmask(sigset_t sigmask) { _caller_sigmask = sigmask; }
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 tid_t kernel_thread_id() const {
74 return _kernel_thread_id;
75 }
76 void set_kernel_thread_id(tid_t tid) {
77 _kernel_thread_id = tid;
78 }
79
80 pthread_t pthread_id() const {
81 // Here: same as OSThread::thread_id()
82 return _thread_id;
83 }
84
85 // ***************************************************************
86 // suspension support.
87 // ***************************************************************
88
89 public:
90 // flags that support signal based suspend/resume on Aix are in a
91 // separate class to avoid confusion with many flags in OSThread that
92 // are used by VM level suspend/resume.
93 os::SuspendResume sr;
94
95 // _ucontext and _siginfo are used by SR_handler() to save thread context,
96 // and they will later be used to walk the stack or reposition thread PC.
97 // If the thread is not suspended in SR_handler() (e.g. self suspend),
98 // the value in _ucontext is meaningless, so we must use the last Java
99 // frame information as the frame. This will mean that for threads
100 // that are parked on a mutex the profiler (and safepoint mechanism)
101 // will see the thread as if it were still in the Java frame. This
102 // not a problem for the profiler since the Java frame is a close
103 // enough result. For the safepoint mechanism when the give it the
104 // Java frame we are not at a point where the safepoint needs the
105 // frame to that accurate (like for a compiled safepoint) since we
106 // should be in a place where we are native and will block ourselves
107 // if we transition.
108 private:
109 void* _siginfo;
110 ucontext_t* _ucontext;
111 int _expanding_stack; // non zero if manually expanding stack
112 address _alt_sig_stack; // address of base of alternate signal stack
113
114 public:
115 void* siginfo() const { return _siginfo; }
116 void set_siginfo(void* ptr) { _siginfo = ptr; }
117 ucontext_t* ucontext() const { return _ucontext; }
118 void set_ucontext(ucontext_t* ptr) { _ucontext = ptr; }
119 void set_expanding_stack(void) { _expanding_stack = 1; }
120 void clear_expanding_stack(void) { _expanding_stack = 0; }
121 int expanding_stack(void) { return _expanding_stack; }
122
123 void set_alt_sig_stack(address val) { _alt_sig_stack = val; }
124 address alt_sig_stack(void) { return _alt_sig_stack; }
125
126 private:
127 Monitor* _startThread_lock; // sync parent and child in thread creation
128
129 public:
130
131 Monitor* startThread_lock() const {
132 return _startThread_lock;
133 }
134
135 // ***************************************************************
136 // Platform dependent initialization and cleanup
137 // ***************************************************************
138
139 private:
140
141 void pd_initialize();
142 void pd_destroy();
143
144 public:
145
146 // The last measured values of cpu timing to prevent the "stale
147 // value return" bug in thread_cpu_time.
148 volatile struct {
149 jlong sys;
150 jlong user;
151 } _last_cpu_times;
152
153 #endif // OS_AIX_VM_OSTHREAD_AIX_HPP