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annotate src/os/bsd/vm/osThread_bsd.hpp @ 21406:b4aca5ec3f10
Truffle/Instrumentation: Javadoc commentary
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
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date | Sun, 17 May 2015 18:30:43 -0700 |
parents | faff125a1ead |
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rev | line source |
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3960 | 1 /* |
10405 | 2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved. |
3960 | 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_BSD_VM_OSTHREAD_BSD_HPP | |
26 #define OS_BSD_VM_OSTHREAD_BSD_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 | |
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42 #ifdef __APPLE__ |
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43 typedef thread_t thread_id_t; |
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44 #else |
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45 typedef pid_t thread_id_t; |
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46 #endif |
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47 |
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48 // _pthread_id is the pthread id, which is used by library calls |
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49 // (e.g. pthread_kill). |
3960 | 50 pthread_t _pthread_id; |
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51 |
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52 // This is the "thread_id" from struct thread_identifier_info. According to a |
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53 // comment in thread_info.h, this is a "system-wide unique 64-bit thread id". |
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54 // The value is used by SA to correlate threads. |
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55 uint64_t _unique_thread_id; |
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56 |
3960 | 57 sigset_t _caller_sigmask; // Caller's signal mask |
58 | |
59 public: | |
60 | |
61 // Methods to save/restore caller's signal mask | |
62 sigset_t caller_sigmask() const { return _caller_sigmask; } | |
63 void set_caller_sigmask(sigset_t sigmask) { _caller_sigmask = sigmask; } | |
64 | |
65 #ifndef PRODUCT | |
66 // Used for debugging, return a unique integer for each thread. | |
67 intptr_t thread_identifier() const { return (intptr_t)_pthread_id; } | |
68 #endif | |
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69 |
3960 | 70 #ifdef ASSERT |
71 // We expect no reposition failures so kill vm if we get one. | |
72 // | |
73 bool valid_reposition_failure() { | |
74 return false; | |
75 } | |
76 #endif // ASSERT | |
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77 |
3960 | 78 pthread_t pthread_id() const { |
79 return _pthread_id; | |
80 } | |
81 void set_pthread_id(pthread_t tid) { | |
82 _pthread_id = tid; | |
83 } | |
84 | |
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85 void set_unique_thread_id(uint64_t id) { |
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86 _unique_thread_id = id; |
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87 } |
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88 |
3960 | 89 // *************************************************************** |
90 // suspension support. | |
91 // *************************************************************** | |
92 | |
93 public: | |
94 // flags that support signal based suspend/resume on Bsd are in a | |
95 // separate class to avoid confusion with many flags in OSThread that | |
96 // are used by VM level suspend/resume. | |
10405 | 97 os::SuspendResume sr; |
3960 | 98 |
99 // _ucontext and _siginfo are used by SR_handler() to save thread context, | |
100 // and they will later be used to walk the stack or reposition thread PC. | |
101 // If the thread is not suspended in SR_handler() (e.g. self suspend), | |
102 // the value in _ucontext is meaningless, so we must use the last Java | |
103 // frame information as the frame. This will mean that for threads | |
104 // that are parked on a mutex the profiler (and safepoint mechanism) | |
105 // will see the thread as if it were still in the Java frame. This | |
106 // not a problem for the profiler since the Java frame is a close | |
107 // enough result. For the safepoint mechanism when the give it the | |
108 // Java frame we are not at a point where the safepoint needs the | |
109 // frame to that accurate (like for a compiled safepoint) since we | |
110 // should be in a place where we are native and will block ourselves | |
111 // if we transition. | |
112 private: | |
113 void* _siginfo; | |
114 ucontext_t* _ucontext; | |
115 int _expanding_stack; /* non zero if manually expanding stack */ | |
116 address _alt_sig_stack; /* address of base of alternate signal stack */ | |
117 | |
118 public: | |
119 void* siginfo() const { return _siginfo; } | |
120 void set_siginfo(void* ptr) { _siginfo = ptr; } | |
121 ucontext_t* ucontext() const { return _ucontext; } | |
122 void set_ucontext(ucontext_t* ptr) { _ucontext = ptr; } | |
123 void set_expanding_stack(void) { _expanding_stack = 1; } | |
124 void clear_expanding_stack(void) { _expanding_stack = 0; } | |
125 int expanding_stack(void) { return _expanding_stack; } | |
126 | |
127 void set_alt_sig_stack(address val) { _alt_sig_stack = val; } | |
128 address alt_sig_stack(void) { return _alt_sig_stack; } | |
129 | |
130 private: | |
131 Monitor* _startThread_lock; // sync parent and child in thread creation | |
132 | |
133 public: | |
134 | |
135 Monitor* startThread_lock() const { | |
136 return _startThread_lock; | |
137 } | |
138 | |
139 // *************************************************************** | |
140 // Platform dependent initialization and cleanup | |
141 // *************************************************************** | |
142 | |
143 private: | |
144 | |
145 void pd_initialize(); | |
146 void pd_destroy(); | |
147 | |
148 // Reconciliation History | |
149 // osThread_solaris.hpp 1.24 99/08/27 13:11:54 | |
150 // End | |
151 | |
152 #endif // OS_BSD_VM_OSTHREAD_BSD_HPP |