os_bsd.hpp revision 8575:5916110131c4 
1/*
2 * Copyright (c) 1999, 2014, 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// Information about the protection of the page at address '0' on this os.
31static bool zero_page_read_protected() { return true; }
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#ifdef __APPLE__
59  // mach_absolute_time
60  static mach_timebase_info_data_t _timebase_info;
61  static volatile uint64_t         _max_abstime;
62#else
63  static int (*_clock_gettime)(clockid_t, struct timespec *);
64#endif
65
66  static GrowableArray<int>* _cpu_to_node;
67
68 protected:
69
70  static julong _physical_memory;
71  static pthread_t _main_thread;
72  static int _page_size;
73
74  static julong available_memory();
75  static julong physical_memory() { return _physical_memory; }
76  static void initialize_system_info();
77
78  static bool supports_variable_stack_size();
79
80  static void rebuild_cpu_to_node_map();
81  static GrowableArray<int>* cpu_to_node()    { return _cpu_to_node; }
82
83  static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
84
85 public:
86
87  static void init_thread_fpu_state();
88  static pthread_t main_thread(void)                                { return _main_thread; }
89
90  static void hotspot_sigmask(Thread* thread);
91
92  static bool is_initial_thread(void);
93  static pid_t gettid();
94
95  static int page_size(void)                                        { return _page_size; }
96  static void set_page_size(int val)                                { _page_size = val; }
97
98  static address   ucontext_get_pc(ucontext_t* uc);
99  static void ucontext_set_pc(ucontext_t* uc, address pc);
100  static intptr_t* ucontext_get_sp(ucontext_t* uc);
101  static intptr_t* ucontext_get_fp(ucontext_t* uc);
102
103  // For Analyzer Forte AsyncGetCallTrace profiling support:
104  //
105  // This interface should be declared in os_bsd_i486.hpp, but
106  // that file provides extensions to the os class and not the
107  // Bsd class.
108  static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
109                                              intptr_t** ret_sp, intptr_t** ret_fp);
110
111  // This boolean allows users to forward their own non-matching signals
112  // to JVM_handle_bsd_signal, harmlessly.
113  static bool signal_handlers_are_installed;
114
115  static int get_our_sigflags(int);
116  static void set_our_sigflags(int, int);
117  static void signal_sets_init();
118  static void install_signal_handlers();
119  static void set_signal_handler(int, bool);
120  static bool is_sig_ignored(int sig);
121
122  static sigset_t* unblocked_signals();
123  static sigset_t* vm_signals();
124  static sigset_t* allowdebug_blocked_signals();
125
126  // For signal-chaining
127  static struct sigaction *get_chained_signal_action(int sig);
128  static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
129
130  // Minimum stack size a thread can be created with (allowing
131  // the VM to completely create the thread and enter user code)
132  static size_t min_stack_allowed;
133
134  // Return default stack size or guard size for the specified thread type
135  static size_t default_stack_size(os::ThreadType thr_type);
136  static size_t default_guard_size(os::ThreadType thr_type);
137
138  // Real-time clock functions
139  static void clock_init(void);
140
141  // Stack repair handling
142
143  // none present
144
145 private:
146  typedef int (*sched_getcpu_func_t)(void);
147  typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
148  typedef int (*numa_max_node_func_t)(void);
149  typedef int (*numa_available_func_t)(void);
150  typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
151  typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
152
153  static sched_getcpu_func_t _sched_getcpu;
154  static numa_node_to_cpus_func_t _numa_node_to_cpus;
155  static numa_max_node_func_t _numa_max_node;
156  static numa_available_func_t _numa_available;
157  static numa_tonode_memory_func_t _numa_tonode_memory;
158  static numa_interleave_memory_func_t _numa_interleave_memory;
159  static unsigned long* _numa_all_nodes;
160
161  static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
162  static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
163  static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
164  static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
165  static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
166  static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
167  static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
168 public:
169  static int sched_getcpu()  { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
170  static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
171    return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
172  }
173  static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
174  static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
175  static int numa_tonode_memory(void *start, size_t size, int node) {
176    return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
177  }
178  static void numa_interleave_memory(void *start, size_t size) {
179    if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
180      _numa_interleave_memory(start, size, _numa_all_nodes);
181    }
182  }
183  static int get_node_by_cpu(int cpu_id);
184};
185
186
187class PlatformEvent : public CHeapObj<mtInternal> {
188 private:
189  double CachePad[4];   // increase odds that _mutex is sole occupant of cache line
190  volatile int _Event;
191  volatile int _nParked;
192  pthread_mutex_t _mutex[1];
193  pthread_cond_t  _cond[1];
194  double PostPad[2];
195  Thread * _Assoc;
196
197 public:       // TODO-FIXME: make dtor private
198  ~PlatformEvent() { guarantee(0, "invariant"); }
199
200 public:
201  PlatformEvent() {
202    int status;
203    status = pthread_cond_init(_cond, NULL);
204    assert_status(status == 0, status, "cond_init");
205    status = pthread_mutex_init(_mutex, NULL);
206    assert_status(status == 0, status, "mutex_init");
207    _Event   = 0;
208    _nParked = 0;
209    _Assoc   = NULL;
210  }
211
212  // Use caution with reset() and fired() -- they may require MEMBARs
213  void reset() { _Event = 0; }
214  int  fired() { return _Event; }
215  void park();
216  void unpark();
217  int  park(jlong millis);
218  void SetAssociation(Thread * a) { _Assoc = a; }
219};
220
221class PlatformParker : public CHeapObj<mtInternal> {
222 protected:
223  pthread_mutex_t _mutex[1];
224  pthread_cond_t  _cond[1];
225
226 public:       // TODO-FIXME: make dtor private
227  ~PlatformParker() { guarantee(0, "invariant"); }
228
229 public:
230  PlatformParker() {
231    int status;
232    status = pthread_cond_init(_cond, NULL);
233    assert_status(status == 0, status, "cond_init");
234    status = pthread_mutex_init(_mutex, NULL);
235    assert_status(status == 0, status, "mutex_init");
236  }
237};
238
239#endif // OS_BSD_VM_OS_BSD_HPP
240