1 /*
2 * Copyright (c) 1999, 2010, 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 */
31 typedef 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
36 typedef int clockid_t;
37 #endif
38
39 class 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 #ifndef _ALLBSD_SOURCE
60 static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *);
61
62 static address _initial_thread_stack_bottom;
63 static uintptr_t _initial_thread_stack_size;
64
65 static const char *_glibc_version;
66 static const char *_libpthread_version;
67
68 static bool _is_floating_stack;
69 static bool _is_NPTL;
70 static bool _supports_fast_thread_cpu_time;
71 #endif
72
73 static GrowableArray<int>* _cpu_to_node;
74
75 protected:
76
77 static julong _physical_memory;
78 static pthread_t _main_thread;
79 #ifndef _ALLBSD_SOURCE
80 static Mutex* _createThread_lock;
81 #endif
82 static int _page_size;
83
84 static julong available_memory();
85 static julong physical_memory() { return _physical_memory; }
86 static void initialize_system_info();
87
88 #ifndef _ALLBSD_SOURCE
89 static void set_glibc_version(const char *s) { _glibc_version = s; }
90 static void set_libpthread_version(const char *s) { _libpthread_version = s; }
91 #endif
92
93 static bool supports_variable_stack_size();
94
95 #ifndef _ALLBSD_SOURCE
96 static void set_is_NPTL() { _is_NPTL = true; }
97 static void set_is_BsdThreads() { _is_NPTL = false; }
98 static void set_is_floating_stack() { _is_floating_stack = true; }
99 #endif
100
101 static void rebuild_cpu_to_node_map();
102 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; }
103
104 static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
105
106 public:
107
108 static void init_thread_fpu_state();
109 #ifndef _ALLBSD_SOURCE
110 static int get_fpu_control_word();
111 static void set_fpu_control_word(int fpu_control);
112 #endif
113 static pthread_t main_thread(void) { return _main_thread; }
114
115 #ifndef _ALLBSD_SOURCE
116 // returns kernel thread id (similar to LWP id on Solaris), which can be
117 // used to access /proc
118 static pid_t gettid();
119 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; }
120 static Mutex* createThread_lock(void) { return _createThread_lock; }
121 #endif
122 static void hotspot_sigmask(Thread* thread);
123
124 #ifndef _ALLBSD_SOURCE
125 static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; }
126 static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; }
127 #endif
128 static bool is_initial_thread(void);
129
130 static int page_size(void) { return _page_size; }
131 static void set_page_size(int val) { _page_size = val; }
132
133 static address ucontext_get_pc(ucontext_t* uc);
134 static intptr_t* ucontext_get_sp(ucontext_t* uc);
135 static intptr_t* ucontext_get_fp(ucontext_t* uc);
136
137 // For Analyzer Forte AsyncGetCallTrace profiling support:
138 //
139 // This interface should be declared in os_bsd_i486.hpp, but
140 // that file provides extensions to the os class and not the
141 // Bsd class.
142 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
143 intptr_t** ret_sp, intptr_t** ret_fp);
144
145 // This boolean allows users to forward their own non-matching signals
146 // to JVM_handle_bsd_signal, harmlessly.
147 static bool signal_handlers_are_installed;
148
149 static int get_our_sigflags(int);
150 static void set_our_sigflags(int, int);
151 static void signal_sets_init();
152 static void install_signal_handlers();
153 static void set_signal_handler(int, bool);
154 static bool is_sig_ignored(int sig);
155
156 static sigset_t* unblocked_signals();
157 static sigset_t* vm_signals();
158 static sigset_t* allowdebug_blocked_signals();
159
160 // For signal-chaining
161 static struct sigaction *get_chained_signal_action(int sig);
162 static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
163
164 #ifndef _ALLBSD_SOURCE
165 // GNU libc and libpthread version strings
166 static const char *glibc_version() { return _glibc_version; }
167 static const char *libpthread_version() { return _libpthread_version; }
168
169 // NPTL or BsdThreads?
170 static bool is_BsdThreads() { return !_is_NPTL; }
171 static bool is_NPTL() { return _is_NPTL; }
172
173 // NPTL is always floating stack. BsdThreads could be using floating
174 // stack or fixed stack.
175 static bool is_floating_stack() { return _is_floating_stack; }
176
177 static void libpthread_init();
178 static bool libnuma_init();
179 static void* libnuma_dlsym(void* handle, const char* name);
180 #endif
181 // Minimum stack size a thread can be created with (allowing
182 // the VM to completely create the thread and enter user code)
183 static size_t min_stack_allowed;
184
185 // Return default stack size or guard size for the specified thread type
186 static size_t default_stack_size(os::ThreadType thr_type);
187 static size_t default_guard_size(os::ThreadType thr_type);
188
189 #ifndef _ALLBSD_SOURCE
190 static void capture_initial_stack(size_t max_size);
191
192 // Stack overflow handling
193 static bool manually_expand_stack(JavaThread * t, address addr);
194 static int max_register_window_saves_before_flushing();
195 #endif
196
197 // Real-time clock functions
198 static void clock_init(void);
199
200 #ifndef _ALLBSD_SOURCE
201 // fast POSIX clocks support
202 static void fast_thread_clock_init(void);
203 #endif
204
205 static bool supports_monotonic_clock() {
206 return _clock_gettime != NULL;
207 }
208
209 static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
210 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
211 }
212
213 #ifndef _ALLBSD_SOURCE
214 static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) {
215 return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1;
216 }
217
218 static bool supports_fast_thread_cpu_time() {
219 return _supports_fast_thread_cpu_time;
220 }
221
222 static jlong fast_thread_cpu_time(clockid_t clockid);
223 #endif
224
225 // Stack repair handling
226
227 // none present
228
229 // BsdThreads work-around for 6292965
230 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
231
232
233 // Bsd suspend/resume support - this helper is a shadow of its former
234 // self now that low-level suspension is barely used, and old workarounds
235 // for BsdThreads are no longer needed.
236 class SuspendResume {
237 private:
238 volatile int _suspend_action;
239 // values for suspend_action:
240 #define SR_NONE (0x00)
241 #define SR_SUSPEND (0x01) // suspend request
242 #define SR_CONTINUE (0x02) // resume request
243
244 volatile jint _state;
245 // values for _state: + SR_NONE
246 #define SR_SUSPENDED (0x20)
247 public:
248 SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; }
249
250 int suspend_action() const { return _suspend_action; }
251 void set_suspend_action(int x) { _suspend_action = x; }
252
253 // atomic updates for _state
254 void set_suspended() {
255 jint temp, temp2;
256 do {
257 temp = _state;
258 temp2 = Atomic::cmpxchg(temp | SR_SUSPENDED, &_state, temp);
259 } while (temp2 != temp);
260 }
261 void clear_suspended() {
262 jint temp, temp2;
263 do {
264 temp = _state;
265 temp2 = Atomic::cmpxchg(temp & ~SR_SUSPENDED, &_state, temp);
266 } while (temp2 != temp);
267 }
268 bool is_suspended() { return _state & SR_SUSPENDED; }
269
270 #undef SR_SUSPENDED
271 };
272
273 private:
274 typedef int (*sched_getcpu_func_t)(void);
275 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
276 typedef int (*numa_max_node_func_t)(void);
277 typedef int (*numa_available_func_t)(void);
278 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
279 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
280
281 static sched_getcpu_func_t _sched_getcpu;
282 static numa_node_to_cpus_func_t _numa_node_to_cpus;
283 static numa_max_node_func_t _numa_max_node;
284 static numa_available_func_t _numa_available;
285 static numa_tonode_memory_func_t _numa_tonode_memory;
286 static numa_interleave_memory_func_t _numa_interleave_memory;
287 static unsigned long* _numa_all_nodes;
288
289 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
290 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
291 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
292 static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
293 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
294 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
295 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
296 public:
297 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
298 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
299 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
300 }
301 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
302 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
303 static int numa_tonode_memory(void *start, size_t size, int node) {
304 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
305 }
306 static void numa_interleave_memory(void *start, size_t size) {
307 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
308 _numa_interleave_memory(start, size, _numa_all_nodes);
309 }
310 }
311 static int get_node_by_cpu(int cpu_id);
312 };
313
314
315 class PlatformEvent : public CHeapObj<mtInternal> {
316 private:
317 double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line
318 volatile int _Event ;
319 volatile int _nParked ;
320 pthread_mutex_t _mutex [1] ;
321 pthread_cond_t _cond [1] ;
322 double PostPad [2] ;
323 Thread * _Assoc ;
324
325 public: // TODO-FIXME: make dtor private
326 ~PlatformEvent() { guarantee (0, "invariant") ; }
327
328 public:
329 PlatformEvent() {
330 int status;
331 status = pthread_cond_init (_cond, NULL);
332 assert_status(status == 0, status, "cond_init");
333 status = pthread_mutex_init (_mutex, NULL);
334 assert_status(status == 0, status, "mutex_init");
335 _Event = 0 ;
336 _nParked = 0 ;
337 _Assoc = NULL ;
338 }
339
340 // Use caution with reset() and fired() -- they may require MEMBARs
341 void reset() { _Event = 0 ; }
342 int fired() { return _Event; }
343 void park () ;
344 void unpark () ;
345 int TryPark () ;
346 int park (jlong millis) ;
347 void SetAssociation (Thread * a) { _Assoc = a ; }
348 } ;
349
350 class PlatformParker : public CHeapObj<mtInternal> {
351 protected:
352 pthread_mutex_t _mutex [1] ;
353 pthread_cond_t _cond [1] ;
354
355 public: // TODO-FIXME: make dtor private
356 ~PlatformParker() { guarantee (0, "invariant") ; }
357
358 public:
359 PlatformParker() {
360 int status;
361 status = pthread_cond_init (_cond, NULL);
362 assert_status(status == 0, status, "cond_init");
363 status = pthread_mutex_init (_mutex, NULL);
364 assert_status(status == 0, status, "mutex_init");
365 }
366 } ;
367
368 #endif // OS_BSD_VM_OS_BSD_HPP