Tue, 22 May 2012 10:11:53 +0200
7161732: Improve handling of thread_id in OSThread
Reviewed-by: dholmes, kamg
1 /*
2 * Copyright (c) 1999, 2012, 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
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23 */
25 #ifndef OS_BSD_VM_OSTHREAD_BSD_HPP
26 #define OS_BSD_VM_OSTHREAD_BSD_HPP
28 private:
29 int _thread_type;
31 public:
33 int thread_type() const {
34 return _thread_type;
35 }
36 void set_thread_type(int type) {
37 _thread_type = type;
38 }
40 private:
42 #ifdef _ALLBSD_SOURCE
44 #ifdef __APPLE__
45 typedef thread_t thread_id_t;
46 #else
47 typedef pthread_t thread_id_t;
48 #endif
50 #else
51 typedef pid_t thread_id_t;
52 #endif
54 // _pthread_id is the pthread id, which is used by library calls
55 // (e.g. pthread_kill).
56 pthread_t _pthread_id;
58 sigset_t _caller_sigmask; // Caller's signal mask
60 public:
62 // Methods to save/restore caller's signal mask
63 sigset_t caller_sigmask() const { return _caller_sigmask; }
64 void set_caller_sigmask(sigset_t sigmask) { _caller_sigmask = sigmask; }
66 #ifndef PRODUCT
67 // Used for debugging, return a unique integer for each thread.
68 intptr_t thread_identifier() const { return (intptr_t)_pthread_id; }
69 #endif
71 #ifdef ASSERT
72 // We expect no reposition failures so kill vm if we get one.
73 //
74 bool valid_reposition_failure() {
75 return false;
76 }
77 #endif // ASSERT
79 pthread_t pthread_id() const {
80 return _pthread_id;
81 }
82 void set_pthread_id(pthread_t tid) {
83 _pthread_id = tid;
84 }
86 // ***************************************************************
87 // suspension support.
88 // ***************************************************************
90 public:
91 // flags that support signal based suspend/resume on Bsd are in a
92 // separate class to avoid confusion with many flags in OSThread that
93 // are used by VM level suspend/resume.
94 os::Bsd::SuspendResume sr;
96 // _ucontext and _siginfo are used by SR_handler() to save thread context,
97 // and they will later be used to walk the stack or reposition thread PC.
98 // If the thread is not suspended in SR_handler() (e.g. self suspend),
99 // the value in _ucontext is meaningless, so we must use the last Java
100 // frame information as the frame. This will mean that for threads
101 // that are parked on a mutex the profiler (and safepoint mechanism)
102 // will see the thread as if it were still in the Java frame. This
103 // not a problem for the profiler since the Java frame is a close
104 // enough result. For the safepoint mechanism when the give it the
105 // Java frame we are not at a point where the safepoint needs the
106 // frame to that accurate (like for a compiled safepoint) since we
107 // should be in a place where we are native and will block ourselves
108 // if we transition.
109 private:
110 void* _siginfo;
111 ucontext_t* _ucontext;
112 int _expanding_stack; /* non zero if manually expanding stack */
113 address _alt_sig_stack; /* address of base of alternate signal stack */
115 public:
116 void* siginfo() const { return _siginfo; }
117 void set_siginfo(void* ptr) { _siginfo = ptr; }
118 ucontext_t* ucontext() const { return _ucontext; }
119 void set_ucontext(ucontext_t* ptr) { _ucontext = ptr; }
120 void set_expanding_stack(void) { _expanding_stack = 1; }
121 void clear_expanding_stack(void) { _expanding_stack = 0; }
122 int expanding_stack(void) { return _expanding_stack; }
124 void set_alt_sig_stack(address val) { _alt_sig_stack = val; }
125 address alt_sig_stack(void) { return _alt_sig_stack; }
127 private:
128 Monitor* _startThread_lock; // sync parent and child in thread creation
130 public:
132 Monitor* startThread_lock() const {
133 return _startThread_lock;
134 }
136 // ***************************************************************
137 // Platform dependent initialization and cleanup
138 // ***************************************************************
140 private:
142 void pd_initialize();
143 void pd_destroy();
145 // Reconciliation History
146 // osThread_solaris.hpp 1.24 99/08/27 13:11:54
147 // End
149 #endif // OS_BSD_VM_OSTHREAD_BSD_HPP