os_bsd.hpp revision 5399:faff125a1ead 
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_BSD_VM_OS_BSD_HPP
26#define OS_BSD_VM_OS_BSD_HPP
27
28// Bsd_OS defines the interface to Bsd operating systems
29
30/* pthread_getattr_np comes with BsdThreads-0.9-7 on RedHat 7.1 */
31typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
32
33#ifdef __APPLE__
34// Mac OS X doesn't support clock_gettime. Stub out the type, it is
35// unused
36typedef int clockid_t;
37#endif
38
39class Bsd {
40  friend class os;
41
42  // For signal-chaining
43#define MAXSIGNUM 32
44  static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
45  static unsigned int sigs;             // mask of signals that have
46                                        // preinstalled signal handlers
47  static bool libjsig_is_loaded;        // libjsig that interposes sigaction(),
48                                        // __sigaction(), signal() is loaded
49  static struct sigaction *(*get_signal_action)(int);
50  static struct sigaction *get_preinstalled_handler(int);
51  static void save_preinstalled_handler(int, struct sigaction&);
52
53  static void check_signal_handler(int sig);
54
55  // For signal flags diagnostics
56  static int sigflags[MAXSIGNUM];
57
58  static int (*_clock_gettime)(clockid_t, struct timespec *);
59
60  static GrowableArray<int>* _cpu_to_node;
61
62 protected:
63
64  static julong _physical_memory;
65  static pthread_t _main_thread;
66  static int _page_size;
67
68  static julong available_memory();
69  static julong physical_memory() { return _physical_memory; }
70  static void initialize_system_info();
71
72  static bool supports_variable_stack_size();
73
74  static void rebuild_cpu_to_node_map();
75  static GrowableArray<int>* cpu_to_node()    { return _cpu_to_node; }
76
77  static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
78
79 public:
80
81  static void init_thread_fpu_state();
82  static pthread_t main_thread(void)                                { return _main_thread; }
83
84  static void hotspot_sigmask(Thread* thread);
85
86  static bool is_initial_thread(void);
87  static pid_t gettid();
88
89  static int page_size(void)                                        { return _page_size; }
90  static void set_page_size(int val)                                { _page_size = val; }
91
92  static address   ucontext_get_pc(ucontext_t* uc);
93  static intptr_t* ucontext_get_sp(ucontext_t* uc);
94  static intptr_t* ucontext_get_fp(ucontext_t* uc);
95
96  // For Analyzer Forte AsyncGetCallTrace profiling support:
97  //
98  // This interface should be declared in os_bsd_i486.hpp, but
99  // that file provides extensions to the os class and not the
100  // Bsd class.
101  static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
102    intptr_t** ret_sp, intptr_t** ret_fp);
103
104  // This boolean allows users to forward their own non-matching signals
105  // to JVM_handle_bsd_signal, harmlessly.
106  static bool signal_handlers_are_installed;
107
108  static int get_our_sigflags(int);
109  static void set_our_sigflags(int, int);
110  static void signal_sets_init();
111  static void install_signal_handlers();
112  static void set_signal_handler(int, bool);
113  static bool is_sig_ignored(int sig);
114
115  static sigset_t* unblocked_signals();
116  static sigset_t* vm_signals();
117  static sigset_t* allowdebug_blocked_signals();
118
119  // For signal-chaining
120  static struct sigaction *get_chained_signal_action(int sig);
121  static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
122
123  // Minimum stack size a thread can be created with (allowing
124  // the VM to completely create the thread and enter user code)
125  static size_t min_stack_allowed;
126
127  // Return default stack size or guard size for the specified thread type
128  static size_t default_stack_size(os::ThreadType thr_type);
129  static size_t default_guard_size(os::ThreadType thr_type);
130
131  // Real-time clock functions
132  static void clock_init(void);
133
134  static inline bool supports_monotonic_clock() {
135    return _clock_gettime != NULL;
136  }
137
138  static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
139    return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
140  }
141
142  // Stack repair handling
143
144  // none present
145
146  // BsdThreads work-around for 6292965
147  static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
148
149private:
150  typedef int (*sched_getcpu_func_t)(void);
151  typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
152  typedef int (*numa_max_node_func_t)(void);
153  typedef int (*numa_available_func_t)(void);
154  typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
155  typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
156
157  static sched_getcpu_func_t _sched_getcpu;
158  static numa_node_to_cpus_func_t _numa_node_to_cpus;
159  static numa_max_node_func_t _numa_max_node;
160  static numa_available_func_t _numa_available;
161  static numa_tonode_memory_func_t _numa_tonode_memory;
162  static numa_interleave_memory_func_t _numa_interleave_memory;
163  static unsigned long* _numa_all_nodes;
164
165  static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
166  static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
167  static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
168  static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
169  static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
170  static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
171  static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
172public:
173  static int sched_getcpu()  { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
174  static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
175    return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
176  }
177  static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
178  static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
179  static int numa_tonode_memory(void *start, size_t size, int node) {
180    return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
181  }
182  static void numa_interleave_memory(void *start, size_t size) {
183    if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
184      _numa_interleave_memory(start, size, _numa_all_nodes);
185    }
186  }
187  static int get_node_by_cpu(int cpu_id);
188};
189
190
191class PlatformEvent : public CHeapObj<mtInternal> {
192  private:
193    double CachePad [4] ;   // increase odds that _mutex is sole occupant of cache line
194    volatile int _Event ;
195    volatile int _nParked ;
196    pthread_mutex_t _mutex  [1] ;
197    pthread_cond_t  _cond   [1] ;
198    double PostPad  [2] ;
199    Thread * _Assoc ;
200
201  public:       // TODO-FIXME: make dtor private
202    ~PlatformEvent() { guarantee (0, "invariant") ; }
203
204  public:
205    PlatformEvent() {
206      int status;
207      status = pthread_cond_init (_cond, NULL);
208      assert_status(status == 0, status, "cond_init");
209      status = pthread_mutex_init (_mutex, NULL);
210      assert_status(status == 0, status, "mutex_init");
211      _Event   = 0 ;
212      _nParked = 0 ;
213      _Assoc   = NULL ;
214    }
215
216    // Use caution with reset() and fired() -- they may require MEMBARs
217    void reset() { _Event = 0 ; }
218    int  fired() { return _Event; }
219    void park () ;
220    void unpark () ;
221    int  TryPark () ;
222    int  park (jlong millis) ;
223    void SetAssociation (Thread * a) { _Assoc = a ; }
224};
225
226class PlatformParker : public CHeapObj<mtInternal> {
227  protected:
228    pthread_mutex_t _mutex [1] ;
229    pthread_cond_t  _cond  [1] ;
230
231  public:       // TODO-FIXME: make dtor private
232    ~PlatformParker() { guarantee (0, "invariant") ; }
233
234  public:
235    PlatformParker() {
236      int status;
237      status = pthread_cond_init (_cond, NULL);
238      assert_status(status == 0, status, "cond_init");
239      status = pthread_mutex_init (_mutex, NULL);
240      assert_status(status == 0, status, "mutex_init");
241    }
242};
243
244#endif // OS_BSD_VM_OS_BSD_HPP
245