os_linux.hpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 1999, 2009, 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// Linux_OS defines the interface to Linux operating systems 26 27/* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */ 28typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *); 29 30class Linux { 31 friend class os; 32 33 // For signal-chaining 34#define MAXSIGNUM 32 35 static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions 36 static unsigned int sigs; // mask of signals that have 37 // preinstalled signal handlers 38 static bool libjsig_is_loaded; // libjsig that interposes sigaction(), 39 // __sigaction(), signal() is loaded 40 static struct sigaction *(*get_signal_action)(int); 41 static struct sigaction *get_preinstalled_handler(int); 42 static void save_preinstalled_handler(int, struct sigaction&); 43 44 static void check_signal_handler(int sig); 45 46 // For signal flags diagnostics 47 static int sigflags[MAXSIGNUM]; 48 49 static int (*_clock_gettime)(clockid_t, struct timespec *); 50 static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *); 51 52 static address _initial_thread_stack_bottom; 53 static uintptr_t _initial_thread_stack_size; 54 55 static const char *_glibc_version; 56 static const char *_libpthread_version; 57 58 static bool _is_floating_stack; 59 static bool _is_NPTL; 60 static bool _supports_fast_thread_cpu_time; 61 62 static GrowableArray<int>* _cpu_to_node; 63 64 protected: 65 66 static julong _physical_memory; 67 static pthread_t _main_thread; 68 static Mutex* _createThread_lock; 69 static int _page_size; 70 71 static julong available_memory(); 72 static julong physical_memory() { return _physical_memory; } 73 static void initialize_system_info(); 74 75 static void set_glibc_version(const char *s) { _glibc_version = s; } 76 static void set_libpthread_version(const char *s) { _libpthread_version = s; } 77 78 static bool supports_variable_stack_size(); 79 80 static void set_is_NPTL() { _is_NPTL = true; } 81 static void set_is_LinuxThreads() { _is_NPTL = false; } 82 static void set_is_floating_stack() { _is_floating_stack = true; } 83 84 static void rebuild_cpu_to_node_map(); 85 static GrowableArray<int>* cpu_to_node() { return _cpu_to_node; } 86 public: 87 static void init_thread_fpu_state(); 88 static int get_fpu_control_word(); 89 static void set_fpu_control_word(int fpu_control); 90 static pthread_t main_thread(void) { return _main_thread; } 91 // returns kernel thread id (similar to LWP id on Solaris), which can be 92 // used to access /proc 93 static pid_t gettid(); 94 static void set_createThread_lock(Mutex* lk) { _createThread_lock = lk; } 95 static Mutex* createThread_lock(void) { return _createThread_lock; } 96 static void hotspot_sigmask(Thread* thread); 97 98 static address initial_thread_stack_bottom(void) { return _initial_thread_stack_bottom; } 99 static uintptr_t initial_thread_stack_size(void) { return _initial_thread_stack_size; } 100 static bool is_initial_thread(void); 101 102 static int page_size(void) { return _page_size; } 103 static void set_page_size(int val) { _page_size = val; } 104 105 static address ucontext_get_pc(ucontext_t* uc); 106 static intptr_t* ucontext_get_sp(ucontext_t* uc); 107 static intptr_t* ucontext_get_fp(ucontext_t* uc); 108 109 // For Analyzer Forte AsyncGetCallTrace profiling support: 110 // 111 // This interface should be declared in os_linux_i486.hpp, but 112 // that file provides extensions to the os class and not the 113 // Linux class. 114 static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc, 115 intptr_t** ret_sp, intptr_t** ret_fp); 116 117 // This boolean allows users to forward their own non-matching signals 118 // to JVM_handle_linux_signal, harmlessly. 119 static bool signal_handlers_are_installed; 120 121 static int get_our_sigflags(int); 122 static void set_our_sigflags(int, int); 123 static void signal_sets_init(); 124 static void install_signal_handlers(); 125 static void set_signal_handler(int, bool); 126 static bool is_sig_ignored(int sig); 127 128 static sigset_t* unblocked_signals(); 129 static sigset_t* vm_signals(); 130 static sigset_t* allowdebug_blocked_signals(); 131 132 // For signal-chaining 133 static struct sigaction *get_chained_signal_action(int sig); 134 static bool chained_handler(int sig, siginfo_t* siginfo, void* context); 135 136 // GNU libc and libpthread version strings 137 static const char *glibc_version() { return _glibc_version; } 138 static const char *libpthread_version() { return _libpthread_version; } 139 140 // NPTL or LinuxThreads? 141 static bool is_LinuxThreads() { return !_is_NPTL; } 142 static bool is_NPTL() { return _is_NPTL; } 143 144 // NPTL is always floating stack. LinuxThreads could be using floating 145 // stack or fixed stack. 146 static bool is_floating_stack() { return _is_floating_stack; } 147 148 static void libpthread_init(); 149 static bool libnuma_init(); 150 static void* libnuma_dlsym(void* handle, const char* name); 151 // Minimum stack size a thread can be created with (allowing 152 // the VM to completely create the thread and enter user code) 153 static size_t min_stack_allowed; 154 155 // Return default stack size or guard size for the specified thread type 156 static size_t default_stack_size(os::ThreadType thr_type); 157 static size_t default_guard_size(os::ThreadType thr_type); 158 159 static void capture_initial_stack(size_t max_size); 160 161 // Stack overflow handling 162 static bool manually_expand_stack(JavaThread * t, address addr); 163 static int max_register_window_saves_before_flushing(); 164 165 // Real-time clock functions 166 static void clock_init(void); 167 168 // fast POSIX clocks support 169 static void fast_thread_clock_init(void); 170 171 static bool supports_monotonic_clock() { 172 return _clock_gettime != NULL; 173 } 174 175 static int clock_gettime(clockid_t clock_id, struct timespec *tp) { 176 return _clock_gettime ? _clock_gettime(clock_id, tp) : -1; 177 } 178 179 static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) { 180 return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1; 181 } 182 183 static bool supports_fast_thread_cpu_time() { 184 return _supports_fast_thread_cpu_time; 185 } 186 187 static jlong fast_thread_cpu_time(clockid_t clockid); 188 189 // Stack repair handling 190 191 // none present 192 193 // LinuxThreads work-around for 6292965 194 static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime); 195 196 197 // Linux suspend/resume support - this helper is a shadow of its former 198 // self now that low-level suspension is barely used, and old workarounds 199 // for LinuxThreads are no longer needed. 200 class SuspendResume { 201 private: 202 volatile int _suspend_action; 203 // values for suspend_action: 204 #define SR_NONE (0x00) 205 #define SR_SUSPEND (0x01) // suspend request 206 #define SR_CONTINUE (0x02) // resume request 207 208 volatile jint _state; 209 // values for _state: + SR_NONE 210 #define SR_SUSPENDED (0x20) 211 public: 212 SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; } 213 214 int suspend_action() const { return _suspend_action; } 215 void set_suspend_action(int x) { _suspend_action = x; } 216 217 // atomic updates for _state 218 void set_suspended() { 219 jint temp, temp2; 220 do { 221 temp = _state; 222 temp2 = Atomic::cmpxchg(temp | SR_SUSPENDED, &_state, temp); 223 } while (temp2 != temp); 224 } 225 void clear_suspended() { 226 jint temp, temp2; 227 do { 228 temp = _state; 229 temp2 = Atomic::cmpxchg(temp & ~SR_SUSPENDED, &_state, temp); 230 } while (temp2 != temp); 231 } 232 bool is_suspended() { return _state & SR_SUSPENDED; } 233 234 #undef SR_SUSPENDED 235 }; 236 237private: 238 typedef int (*sched_getcpu_func_t)(void); 239 typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen); 240 typedef int (*numa_max_node_func_t)(void); 241 typedef int (*numa_available_func_t)(void); 242 typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node); 243 typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask); 244 245 static sched_getcpu_func_t _sched_getcpu; 246 static numa_node_to_cpus_func_t _numa_node_to_cpus; 247 static numa_max_node_func_t _numa_max_node; 248 static numa_available_func_t _numa_available; 249 static numa_tonode_memory_func_t _numa_tonode_memory; 250 static numa_interleave_memory_func_t _numa_interleave_memory; 251 static unsigned long* _numa_all_nodes; 252 253 static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; } 254 static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; } 255 static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; } 256 static void set_numa_available(numa_available_func_t func) { _numa_available = func; } 257 static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; } 258 static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; } 259 static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; } 260public: 261 static int sched_getcpu() { return _sched_getcpu != NULL ? _sched_getcpu() : -1; } 262 static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) { 263 return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1; 264 } 265 static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; } 266 static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; } 267 static int numa_tonode_memory(void *start, size_t size, int node) { 268 return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1; 269 } 270 static void numa_interleave_memory(void *start, size_t size) { 271 if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) { 272 _numa_interleave_memory(start, size, _numa_all_nodes); 273 } 274 } 275 static int get_node_by_cpu(int cpu_id); 276}; 277 278 279class PlatformEvent : public CHeapObj { 280 private: 281 double CachePad [4] ; // increase odds that _mutex is sole occupant of cache line 282 volatile int _Event ; 283 volatile int _nParked ; 284 pthread_mutex_t _mutex [1] ; 285 pthread_cond_t _cond [1] ; 286 double PostPad [2] ; 287 Thread * _Assoc ; 288 289 public: // TODO-FIXME: make dtor private 290 ~PlatformEvent() { guarantee (0, "invariant") ; } 291 292 public: 293 PlatformEvent() { 294 int status; 295 status = pthread_cond_init (_cond, NULL); 296 assert_status(status == 0, status, "cond_init"); 297 status = pthread_mutex_init (_mutex, NULL); 298 assert_status(status == 0, status, "mutex_init"); 299 _Event = 0 ; 300 _nParked = 0 ; 301 _Assoc = NULL ; 302 } 303 304 // Use caution with reset() and fired() -- they may require MEMBARs 305 void reset() { _Event = 0 ; } 306 int fired() { return _Event; } 307 void park () ; 308 void unpark () ; 309 int TryPark () ; 310 int park (jlong millis) ; 311 void SetAssociation (Thread * a) { _Assoc = a ; } 312} ; 313 314class PlatformParker : public CHeapObj { 315 protected: 316 pthread_mutex_t _mutex [1] ; 317 pthread_cond_t _cond [1] ; 318 319 public: // TODO-FIXME: make dtor private 320 ~PlatformParker() { guarantee (0, "invariant") ; } 321 322 public: 323 PlatformParker() { 324 int status; 325 status = pthread_cond_init (_cond, NULL); 326 assert_status(status == 0, status, "cond_init"); 327 status = pthread_mutex_init (_mutex, NULL); 328 assert_status(status == 0, status, "mutex_init"); 329 } 330} ; 331