os.hpp revision 11869:03762a0cf7e1
171088Sjasone/* 271088Sjasone * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 371088Sjasone * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 471088Sjasone * 571088Sjasone * This code is free software; you can redistribute it and/or modify it 671088Sjasone * under the terms of the GNU General Public License version 2 only, as 771088Sjasone * published by the Free Software Foundation. 871088Sjasone * 971088Sjasone * This code is distributed in the hope that it will be useful, but WITHOUT 1071088Sjasone * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1171088Sjasone * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1271088Sjasone * version 2 for more details (a copy is included in the LICENSE file that 1371088Sjasone * accompanied this code). 1471088Sjasone * 1571088Sjasone * You should have received a copy of the GNU General Public License version 1671088Sjasone * 2 along with this work; if not, write to the Free Software Foundation, 1771088Sjasone * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1871088Sjasone * 1971088Sjasone * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2071088Sjasone * or visit www.oracle.com if you need additional information or have any 2171088Sjasone * questions. 2271088Sjasone * 2371088Sjasone */ 2471088Sjasone 2571088Sjasone#ifndef SHARE_VM_RUNTIME_OS_HPP 2671088Sjasone#define SHARE_VM_RUNTIME_OS_HPP 2771088Sjasone 2871088Sjasone#include "jvmtifiles/jvmti.h" 2971088Sjasone#include "prims/jvm.h" 3071088Sjasone#include "runtime/extendedPC.hpp" 3171088Sjasone#include "runtime/handles.hpp" 3271088Sjasone#include "utilities/macros.hpp" 3376166Smarkm#ifndef _WINDOWS 3476166Smarkm# include <setjmp.h> 3571088Sjasone#endif 3671088Sjasone#ifdef __APPLE__ 3771088Sjasone# include <mach/mach_time.h> 3871088Sjasone#endif 3971088Sjasone 4071088Sjasoneclass AgentLibrary; 4171088Sjasone 4271088Sjasone// os defines the interface to operating system; this includes traditional 4371088Sjasone// OS services (time, I/O) as well as other functionality with system- 4471088Sjasone// dependent code. 4571088Sjasone 4671088Sjasonetypedef void (*dll_func)(...); 4771088Sjasone 4871088Sjasoneclass Thread; 4983366Sjulianclass JavaThread; 5083366Sjulianclass Event; 5183366Sjulianclass DLL; 5271088Sjasoneclass FileHandle; 5371088Sjasoneclass NativeCallStack; 5471088Sjasone 5571088Sjasonetemplate<class E> class GrowableArray; 5671088Sjasone 5771088Sjasone// %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose 5871088Sjasone 5971088Sjasone// Platform-independent error return values from OS functions 6071088Sjasoneenum OSReturn { 6171088Sjasone OS_OK = 0, // Operation was successful 6271088Sjasone OS_ERR = -1, // Operation failed 6371088Sjasone OS_INTRPT = -2, // Operation was interrupted 6471088Sjasone OS_TIMEOUT = -3, // Operation timed out 6571088Sjasone OS_NOMEM = -5, // Operation failed for lack of memory 6671088Sjasone OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource 6771088Sjasone}; 6871088Sjasone 6971088Sjasoneenum ThreadPriority { // JLS 20.20.1-3 7071088Sjasone NoPriority = -1, // Initial non-priority value 7171088Sjasone MinPriority = 1, // Minimum priority 7271088Sjasone NormPriority = 5, // Normal (non-daemon) priority 7371088Sjasone NearMaxPriority = 9, // High priority, used for VMThread 7471088Sjasone MaxPriority = 10, // Highest priority, used for WatcherThread 7571088Sjasone // ensures that VMThread doesn't starve profiler 7671088Sjasone CriticalPriority = 11 // Critical thread priority 7771088Sjasone}; 7871088Sjasone 7971088Sjasone// Executable parameter flag for os::commit_memory() and 8071088Sjasone// os::commit_memory_or_exit(). 8171088Sjasoneconst bool ExecMem = true; 8271088Sjasone 8371088Sjasone// Typedef for structured exception handling support 8471088Sjasonetypedef void (*java_call_t)(JavaValue* value, const methodHandle& method, JavaCallArguments* args, Thread* thread); 8571088Sjasone 8671088Sjasoneclass MallocTracker; 8771088Sjasone 8871088Sjasoneclass os: AllStatic { 8971088Sjasone friend class VMStructs; 9071088Sjasone friend class JVMCIVMStructs; 9171088Sjasone friend class MallocTracker; 9271088Sjasone public: 9371088Sjasone enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel) 9471088Sjasone 9571088Sjasone private: 9671088Sjasone static OSThread* _starting_thread; 9771088Sjasone static address _polling_page; 9871088Sjasone static volatile int32_t * _mem_serialize_page; 9971088Sjasone static uintptr_t _serialize_page_mask; 10071088Sjasone public: 10171088Sjasone static size_t _page_sizes[page_sizes_max]; 10271088Sjasone 10371088Sjasone private: 10471088Sjasone static void init_page_sizes(size_t default_page_size) { 10571088Sjasone _page_sizes[0] = default_page_size; 10671088Sjasone _page_sizes[1] = 0; // sentinel 10771088Sjasone } 10871088Sjasone 10971088Sjasone static char* pd_reserve_memory(size_t bytes, char* addr = 0, 11071088Sjasone size_t alignment_hint = 0); 11171088Sjasone static char* pd_attempt_reserve_memory_at(size_t bytes, char* addr); 11271088Sjasone static void pd_split_reserved_memory(char *base, size_t size, 11371088Sjasone size_t split, bool realloc); 11471088Sjasone static bool pd_commit_memory(char* addr, size_t bytes, bool executable); 11583366Sjulian static bool pd_commit_memory(char* addr, size_t size, size_t alignment_hint, 11671088Sjasone bool executable); 11771088Sjasone // Same as pd_commit_memory() that either succeeds or calls 11883366Sjulian // vm_exit_out_of_memory() with the specified mesg. 11983366Sjulian static void pd_commit_memory_or_exit(char* addr, size_t bytes, 12071088Sjasone bool executable, const char* mesg); 12183650Sjhb static void pd_commit_memory_or_exit(char* addr, size_t size, 12283650Sjhb size_t alignment_hint, 12371088Sjasone bool executable, const char* mesg); 12471088Sjasone static bool pd_uncommit_memory(char* addr, size_t bytes); 12571088Sjasone static bool pd_release_memory(char* addr, size_t bytes); 12671088Sjasone 12771088Sjasone static char* pd_map_memory(int fd, const char* file_name, size_t file_offset, 12871088Sjasone char *addr, size_t bytes, bool read_only = false, 12983366Sjulian bool allow_exec = false); 13071088Sjasone static char* pd_remap_memory(int fd, const char* file_name, size_t file_offset, 13183650Sjhb char *addr, size_t bytes, bool read_only, 13271088Sjasone bool allow_exec); 13371088Sjasone static bool pd_unmap_memory(char *addr, size_t bytes); 13471088Sjasone static void pd_free_memory(char *addr, size_t bytes, size_t alignment_hint); 13571088Sjasone static void pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint); 13671088Sjasone 13771088Sjasone static size_t page_size_for_region(size_t region_size, size_t min_pages, bool must_be_aligned); 13871088Sjasone 13971088Sjasone // Get summary strings for system information in buffer provided 14083366Sjulian static void get_summary_cpu_info(char* buf, size_t buflen); 14171088Sjasone static void get_summary_os_info(char* buf, size_t buflen); 14283366Sjulian 14372200Sbmilekic static void initialize_initial_active_processor_count(); 14483650Sjhb public: 14583650Sjhb static void init(void); // Called before command line parsing 14683650Sjhb static void init_before_ergo(void); // Called after command line parsing 14772200Sbmilekic // before VM ergonomics processing. 14883650Sjhb static jint init_2(void); // Called after command line parsing 14971088Sjasone // and VM ergonomics processing 15083366Sjulian static void init_globals(void) { // Called from init_globals() in init.cpp 15183366Sjulian init_globals_ext(); 15283366Sjulian } 15383366Sjulian 15483366Sjulian // File names are case-insensitive on windows only 15571088Sjasone // Override me as needed 15683366Sjulian static int file_name_strcmp(const char* s1, const char* s2); 15771088Sjasone 15871088Sjasone // unset environment variable 15971088Sjasone static bool unsetenv(const char* name); 16071088Sjasone 16171088Sjasone static bool have_special_privileges(); 16283366Sjulian 16371088Sjasone static jlong javaTimeMillis(); 16471088Sjasone static jlong javaTimeNanos(); 16583366Sjulian static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr); 16671088Sjasone static void javaTimeSystemUTC(jlong &seconds, jlong &nanos); 16771088Sjasone static void run_periodic_checks(); 16871088Sjasone static bool supports_monotonic_clock(); 16971088Sjasone 17071088Sjasone // Returns the elapsed time in seconds since the vm started. 17171088Sjasone static double elapsedTime(); 17283366Sjulian 17383366Sjulian // Returns real time in seconds since an arbitrary point 17471088Sjasone // in the past. 17583366Sjulian static bool getTimesSecs(double* process_real_time, 17683366Sjulian double* process_user_time, 17783366Sjulian double* process_system_time); 17883366Sjulian 17983366Sjulian // Interface to the performance counter 18083366Sjulian static jlong elapsed_counter(); 18183366Sjulian static jlong elapsed_frequency(); 18283650Sjhb 18383366Sjulian // The "virtual time" of a thread is the amount of time a thread has 18471088Sjasone // actually run. The first function indicates whether the OS supports 18571088Sjasone // this functionality for the current thread, and if so: 18671088Sjasone // * the second enables vtime tracking (if that is required). 18783366Sjulian // * the third tells whether vtime is enabled. 18871088Sjasone // * the fourth returns the elapsed virtual time for the current 18983366Sjulian // thread. 19071088Sjasone static bool supports_vtime(); 19171088Sjasone static bool enable_vtime(); 19271088Sjasone static bool vtime_enabled(); 19371088Sjasone static double elapsedVTime(); 19471088Sjasone 19571088Sjasone // Return current local time in a string (YYYY-MM-DD HH:MM:SS). 19683366Sjulian // It is MT safe, but not async-safe, as reading time zone 19771088Sjasone // information may require a lock on some platforms. 19871088Sjasone static char* local_time_string(char *buf, size_t buflen); 19983366Sjulian static struct tm* localtime_pd (const time_t* clock, struct tm* res); 20071088Sjasone // Fill in buffer with current local time as an ISO-8601 string. 20183366Sjulian // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz. 20283366Sjulian // Returns buffer, or NULL if it failed. 20371088Sjasone static char* iso8601_time(char* buffer, size_t buffer_length); 20483366Sjulian 20574920Sjhb // Interface for detecting multiprocessor system 20674912Sjhb static inline bool is_MP() { 20771088Sjasone // During bootstrap if _processor_count is not yet initialized 20872200Sbmilekic // we claim to be MP as that is safest. If any platform has a 20971088Sjasone // stub generator that might be triggered in this phase and for 21071088Sjasone // which being declared MP when in fact not, is a problem - then 21171088Sjasone // the bootstrap routine for the stub generator needs to check 21271088Sjasone // the processor count directly and leave the bootstrap routine 21383366Sjulian // in place until called after initialization has ocurred. 21471088Sjasone return (_processor_count != 1) || AssumeMP; 21571088Sjasone } 21672200Sbmilekic static julong available_memory(); 21771088Sjasone static julong physical_memory(); 21871088Sjasone static bool has_allocatable_memory_limit(julong* limit); 21971088Sjasone static bool is_server_class_machine(); 22071088Sjasone 22171088Sjasone // number of CPUs 22272200Sbmilekic static int processor_count() { 22371088Sjasone return _processor_count; 22483366Sjulian } 22583366Sjulian static void set_processor_count(int count) { _processor_count = count; } 22671088Sjasone 22772200Sbmilekic // Returns the number of CPUs this process is currently allowed to run on. 22871088Sjasone // Note that on some OSes this can change dynamically. 22983366Sjulian static int active_processor_count(); 23083366Sjulian 23171088Sjasone // At startup the number of active CPUs this process is allowed to run on. 23271088Sjasone // This value does not change dynamically. May be different from active_processor_count(). 23372200Sbmilekic static int initial_active_processor_count() { 23474912Sjhb assert(_initial_active_processor_count > 0, "Initial active processor count not set yet."); 23571088Sjasone return _initial_active_processor_count; 23671088Sjasone } 23771088Sjasone 23871088Sjasone // Bind processes to processors. 23983366Sjulian // This is a two step procedure: 24071088Sjasone // first you generate a distribution of processes to processors, 24171088Sjasone // then you bind processes according to that distribution. 24271088Sjasone // Compute a distribution for number of processes to processors. 24371088Sjasone // Stores the processor id's into the distribution array argument. 24471088Sjasone // Returns true if it worked, false if it didn't. 24571088Sjasone static bool distribute_processes(uint length, uint* distribution); 24683366Sjulian // Binds the current process to a processor. 24783658Speter // Returns true if it worked, false if it didn't. 24871088Sjasone static bool bind_to_processor(uint processor_id); 24971088Sjasone 25071088Sjasone // Give a name to the current thread. 25171088Sjasone static void set_native_thread_name(const char *name); 25283366Sjulian 25383650Sjhb // Interface for stack banging (predetect possible stack overflow for 25471088Sjasone // exception processing) There are guard pages, and above that shadow 25571088Sjasone // pages for stack overflow checking. 25683366Sjulian static bool uses_stack_guard_pages(); 25783366Sjulian static bool must_commit_stack_guard_pages(); 25871088Sjasone static void map_stack_shadow_pages(address sp); 25983366Sjulian static bool stack_shadow_pages_available(Thread *thread, const methodHandle& method, address sp); 26074920Sjhb 26174912Sjhb // OS interface to Virtual Memory 26271088Sjasone 26372200Sbmilekic // Return the default page size. 26471088Sjasone static int vm_page_size(); 26571088Sjasone 26671088Sjasone // Returns the page size to use for a region of memory. 26771088Sjasone // region_size / min_pages will always be greater than or equal to the 26871088Sjasone // returned value. The returned value will divide region_size. 26971088Sjasone static size_t page_size_for_region_aligned(size_t region_size, size_t min_pages); 27071088Sjasone 27172200Sbmilekic // Returns the page size to use for a region of memory. 27271088Sjasone // region_size / min_pages will always be greater than or equal to the 27371088Sjasone // returned value. The returned value might not divide region_size. 27471088Sjasone static size_t page_size_for_region_unaligned(size_t region_size, size_t min_pages); 27571088Sjasone 27671088Sjasone // Return the largest page size that can be used 27772200Sbmilekic static size_t max_page_size() { 27871088Sjasone // The _page_sizes array is sorted in descending order. 27983366Sjulian return _page_sizes[0]; 28083366Sjulian } 28171088Sjasone 28272200Sbmilekic // Methods for tracing page sizes returned by the above method. 28371088Sjasone // The region_{min,max}_size parameters should be the values 28471088Sjasone // passed to page_size_for_region() and page_size should be the result of that 28583650Sjhb // call. The (optional) base and size parameters should come from the 28671088Sjasone // ReservedSpace base() and size() methods. 28783650Sjhb static void trace_page_sizes(const char* str, const size_t* page_sizes, int count); 28871088Sjasone static void trace_page_sizes(const char* str, 28983650Sjhb const size_t region_min_size, 29071088Sjasone const size_t region_max_size, 29171088Sjasone const size_t page_size, 29271088Sjasone const char* base, 29371088Sjasone const size_t size); 29483650Sjhb static void trace_page_sizes_for_requested_size(const char* str, 29571088Sjasone const size_t requested_size, 29671088Sjasone const size_t page_size, 29778637Sjhb const size_t alignment, 29883366Sjulian const char* base, 29983366Sjulian const size_t size); 30078637Sjhb 30171088Sjasone static int vm_allocation_granularity(); 30272200Sbmilekic static char* reserve_memory(size_t bytes, char* addr = 0, 30374912Sjhb size_t alignment_hint = 0); 30471088Sjasone static char* reserve_memory(size_t bytes, char* addr, 30571088Sjasone size_t alignment_hint, MEMFLAGS flags); 30671088Sjasone static char* reserve_memory_aligned(size_t size, size_t alignment); 30771088Sjasone static char* attempt_reserve_memory_at(size_t bytes, char* addr); 30871088Sjasone static void split_reserved_memory(char *base, size_t size, 30971088Sjasone size_t split, bool realloc); 31071088Sjasone static bool commit_memory(char* addr, size_t bytes, bool executable); 31171088Sjasone static bool commit_memory(char* addr, size_t size, size_t alignment_hint, 31271088Sjasone bool executable); 31371088Sjasone // Same as commit_memory() that either succeeds or calls 31471088Sjasone // vm_exit_out_of_memory() with the specified mesg. 31571088Sjasone static void commit_memory_or_exit(char* addr, size_t bytes, 31683366Sjulian bool executable, const char* mesg); 31771088Sjasone static void commit_memory_or_exit(char* addr, size_t size, 31871088Sjasone size_t alignment_hint, 31971088Sjasone bool executable, const char* mesg); 32083366Sjulian static bool uncommit_memory(char* addr, size_t bytes); 32171088Sjasone static bool release_memory(char* addr, size_t bytes); 32271088Sjasone 32383366Sjulian // Touch memory pages that cover the memory range from start to end (exclusive) 32471088Sjasone // to make the OS back the memory range with actual memory. 32583366Sjulian // Current implementation may not touch the last page if unaligned addresses 32674920Sjhb // are passed. 32774912Sjhb static void pretouch_memory(void* start, void* end); 32871088Sjasone 32972200Sbmilekic enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX }; 33071088Sjasone static bool protect_memory(char* addr, size_t bytes, ProtType prot, 33171088Sjasone bool is_committed = true); 33271088Sjasone 33371088Sjasone static bool guard_memory(char* addr, size_t bytes); 33483366Sjulian static bool unguard_memory(char* addr, size_t bytes); 33571088Sjasone static bool create_stack_guard_pages(char* addr, size_t bytes); 33671088Sjasone static bool pd_create_stack_guard_pages(char* addr, size_t bytes); 33772200Sbmilekic static bool remove_stack_guard_pages(char* addr, size_t bytes); 33871088Sjasone 33971088Sjasone static char* map_memory(int fd, const char* file_name, size_t file_offset, 34071088Sjasone char *addr, size_t bytes, bool read_only = false, 34171088Sjasone bool allow_exec = false); 34271088Sjasone static char* remap_memory(int fd, const char* file_name, size_t file_offset, 34372200Sbmilekic char *addr, size_t bytes, bool read_only, 34471088Sjasone bool allow_exec); 34583366Sjulian static bool unmap_memory(char *addr, size_t bytes); 34683366Sjulian static void free_memory(char *addr, size_t bytes, size_t alignment_hint); 34783366Sjulian static void realign_memory(char *addr, size_t bytes, size_t alignment_hint); 34871088Sjasone 34983366Sjulian // NUMA-specific interface 35083366Sjulian static bool numa_has_static_binding(); 35171088Sjasone static bool numa_has_group_homing(); 35283366Sjulian static void numa_make_local(char *addr, size_t bytes, int lgrp_hint); 35383366Sjulian static void numa_make_global(char *addr, size_t bytes); 35483366Sjulian static size_t numa_get_groups_num(); 35582085Sjhb static size_t numa_get_leaf_groups(int *ids, size_t size); 35682085Sjhb static bool numa_topology_changed(); 35782085Sjhb static int numa_get_group_id(); 35882085Sjhb 35983366Sjulian // Page manipulation 36083366Sjulian struct page_info { 36182085Sjhb size_t size; 36282085Sjhb int lgrp_id; 36371088Sjasone }; 36472200Sbmilekic static bool get_page_info(char *start, page_info* info); 36571088Sjasone static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found); 36683366Sjulian 36783366Sjulian static char* non_memory_address_word(); 36871088Sjasone // reserve, commit and pin the entire memory region 36971088Sjasone static char* reserve_memory_special(size_t size, size_t alignment, 37072200Sbmilekic char* addr, bool executable); 37174912Sjhb static bool release_memory_special(char* addr, size_t bytes); 37271088Sjasone static void large_page_init(); 37371088Sjasone static size_t large_page_size(); 37471088Sjasone static bool can_commit_large_page_memory(); 37571088Sjasone static bool can_execute_large_page_memory(); 37671088Sjasone 37771088Sjasone // OS interface to polling page 37883366Sjulian static address get_polling_page() { return _polling_page; } 37971088Sjasone static void set_polling_page(address page) { _polling_page = page; } 38071088Sjasone static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); } 38171088Sjasone static void make_polling_page_unreadable(); 38271088Sjasone static void make_polling_page_readable(); 38371088Sjasone 38471088Sjasone // Routines used to serialize the thread state without using membars 38583366Sjulian static void serialize_thread_states(); 38683650Sjhb 38771088Sjasone // Since we write to the serialize page from every thread, we 38871088Sjasone // want stores to be on unique cache lines whenever possible 38971088Sjasone // in order to minimize CPU cross talk. We pre-compute the 39071088Sjasone // amount to shift the thread* to make this offset unique to 39183366Sjulian // each thread. 39283650Sjhb static int get_serialize_page_shift_count() { 39371088Sjasone return SerializePageShiftCount; 39471088Sjasone } 39583366Sjulian 39683366Sjulian static void set_serialize_page_mask(uintptr_t mask) { 39771088Sjasone _serialize_page_mask = mask; 39883366Sjulian } 39974920Sjhb 40074912Sjhb static unsigned int get_serialize_page_mask() { 40171088Sjasone return _serialize_page_mask; 40272200Sbmilekic } 40371088Sjasone 40471088Sjasone static void set_memory_serialize_page(address page); 40571088Sjasone 40671088Sjasone static address get_memory_serialize_page() { 40783366Sjulian return (address)_mem_serialize_page; 40871088Sjasone } 40971088Sjasone 41072200Sbmilekic static inline void write_memory_serialize_page(JavaThread *thread) { 41171088Sjasone uintptr_t page_offset = ((uintptr_t)thread >> 41271088Sjasone get_serialize_page_shift_count()) & 41371088Sjasone get_serialize_page_mask(); 41471088Sjasone *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1; 41571088Sjasone } 41672200Sbmilekic 41771088Sjasone static bool is_memory_serialize_page(JavaThread *thread, address addr) { 41883366Sjulian if (UseMembar) return false; 41983366Sjulian // Previously this function calculated the exact address of this 42083366Sjulian // thread's serialize page, and checked if the faulting address 42171088Sjasone // was equal. However, some platforms mask off faulting addresses 42283366Sjulian // to the page size, so now we just check that the address is 42383366Sjulian // within the page. This makes the thread argument unnecessary, 42471088Sjasone // but we retain the NULL check to preserve existing behavior. 42583366Sjulian if (thread == NULL) return false; 42683366Sjulian address page = (address) _mem_serialize_page; 42783366Sjulian return addr >= page && addr < (page + os::vm_page_size()); 42882085Sjhb } 42982085Sjhb 43082085Sjhb static void block_on_serialize_page_trap(); 43182085Sjhb 43283366Sjulian // threads 43383366Sjulian 43482085Sjhb enum ThreadType { 43582085Sjhb vm_thread, 43671088Sjasone cgc_thread, // Concurrent GC thread 43772200Sbmilekic pgc_thread, // Parallel GC thread 43871088Sjasone java_thread, 43971088Sjasone compiler_thread, 44083650Sjhb watcher_thread, 44171088Sjasone os_thread 44283650Sjhb }; 44371088Sjasone 44483650Sjhb static bool create_thread(Thread* thread, 44571088Sjasone ThreadType thr_type, 44671088Sjasone size_t stack_size = 0); 44771088Sjasone static bool create_main_thread(JavaThread* thread); 44871088Sjasone static bool create_attached_thread(JavaThread* thread); 44983650Sjhb static void pd_start_thread(Thread* thread); 45071088Sjasone static void start_thread(Thread* thread); 45171088Sjasone 45278637Sjhb static void initialize_thread(Thread* thr); 45383366Sjulian static void free_thread(OSThread* osthread); 45483366Sjulian 45578637Sjhb // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit 45671088Sjasone static intx current_thread_id(); 45772200Sbmilekic static int current_process_id(); 45874912Sjhb static int sleep(Thread* thread, jlong ms, bool interruptable); 45971088Sjasone // Short standalone OS sleep suitable for slow path spin loop. 46071088Sjasone // Ignores Thread.interrupt() (so keep it short). 46171088Sjasone // ms = 0, will sleep for the least amount of time allowed by the OS. 46271088Sjasone static void naked_short_sleep(jlong ms); 46371088Sjasone static void infinite_sleep(); // never returns, use with CAUTION 46471088Sjasone static void naked_yield () ; 46571088Sjasone static OSReturn set_priority(Thread* thread, ThreadPriority priority); 46671088Sjasone static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority); 46771088Sjasone 46871088Sjasone static void interrupt(Thread* thread); 46971088Sjasone static bool is_interrupted(Thread* thread, bool clear_interrupted); 47083366Sjulian 47171088Sjasone static int pd_self_suspend_thread(Thread* thread); 47271557Sjhb 47383366Sjulian static ExtendedPC fetch_frame_from_context(const void* ucVoid, intptr_t** sp, intptr_t** fp); 47483366Sjulian static frame fetch_frame_from_context(const void* ucVoid); 47583366Sjulian static frame fetch_frame_from_ucontext(Thread* thread, void* ucVoid); 47683366Sjulian 47783366Sjulian static ExtendedPC get_thread_pc(Thread *thread); 47883366Sjulian static void breakpoint(); 47983366Sjulian static bool start_debugging(char *buf, int buflen); 48083366Sjulian 48183366Sjulian static address current_stack_pointer(); 48283366Sjulian static address current_stack_base(); 48383366Sjulian static size_t current_stack_size(); 48483366Sjulian 48583366Sjulian static void verify_stack_alignment() PRODUCT_RETURN; 48683366Sjulian 48783366Sjulian static bool message_box(const char* title, const char* message); 48883366Sjulian static char* do_you_want_to_debug(const char* message); 48983366Sjulian 49083366Sjulian // run cmd in a separate process and return its exit code; or -1 on failures 49171088Sjasone static int fork_and_exec(char *cmd); 49283366Sjulian 49383366Sjulian // Call ::exit() on all platforms but Windows 49471088Sjasone static void exit(int num); 49571088Sjasone 49671088Sjasone // Terminate the VM, but don't exit the process 49771088Sjasone static void shutdown(); 49871088Sjasone 49971088Sjasone // Terminate with an error. Default is to generate a core file on platforms 50083366Sjulian // that support such things. This calls shutdown() and then aborts. 50171088Sjasone static void abort(bool dump_core, void *siginfo, const void *context); 50283366Sjulian static void abort(bool dump_core = true); 50371088Sjasone 50471088Sjasone // Die immediately, no exit hook, no abort hook, no cleanup. 50571088Sjasone static void die(); 50671088Sjasone 50771088Sjasone // File i/o operations 50871088Sjasone static const int default_file_open_flags(); 50971088Sjasone static int open(const char *path, int oflag, int mode); 51071088Sjasone static FILE* open(int fd, const char* mode); 51172200Sbmilekic static int close(int fd); 51271088Sjasone static jlong lseek(int fd, jlong offset, int whence); 51371088Sjasone static char* native_path(char *path); 51471088Sjasone static int ftruncate(int fd, jlong length); 51571088Sjasone static int fsync(int fd); 51672200Sbmilekic static int available(int fd, jlong *bytes); 51771088Sjasone static int get_fileno(FILE* fp); 51871088Sjasone static void flockfile(FILE* fp); 51971088Sjasone static void funlockfile(FILE* fp); 52083366Sjulian 52171088Sjasone static int compare_file_modified_times(const char* file1, const char* file2); 52271088Sjasone 52371088Sjasone //File i/o operations 52471088Sjasone 52571088Sjasone static size_t read(int fd, void *buf, unsigned int nBytes); 52671088Sjasone static size_t read_at(int fd, void *buf, unsigned int nBytes, jlong offset); 52771088Sjasone static size_t restartable_read(int fd, void *buf, unsigned int nBytes); 52872200Sbmilekic static size_t write(int fd, const void *buf, unsigned int nBytes); 52971088Sjasone 53071088Sjasone // Reading directories. 53171088Sjasone static DIR* opendir(const char* dirname); 53272200Sbmilekic static int readdir_buf_size(const char *path); 53371088Sjasone static struct dirent* readdir(DIR* dirp, dirent* dbuf); 53471088Sjasone static int closedir(DIR* dirp); 53571088Sjasone 53683366Sjulian // Dynamic library extension 53771088Sjasone static const char* dll_file_extension(); 53871088Sjasone 53971088Sjasone static const char* get_temp_directory(); 54083366Sjulian static const char* get_current_directory(char *buf, size_t buflen); 54171088Sjasone 54271088Sjasone // Builds a platform-specific full library path given a ld path and lib name 54371088Sjasone // Returns true if buffer contains full path to existing file, false otherwise 54472200Sbmilekic static bool dll_build_name(char* buffer, size_t size, 54583366Sjulian const char* pathname, const char* fname); 54683366Sjulian 54783366Sjulian // Symbol lookup, find nearest function name; basically it implements 54883366Sjulian // dladdr() for all platforms. Name of the nearest function is copied 54971088Sjasone // to buf. Distance from its base address is optionally returned as offset. 55072200Sbmilekic // If function name is not found, buf[0] is set to '\0' and offset is 55171088Sjasone // set to -1 (if offset is non-NULL). 55271088Sjasone static bool dll_address_to_function_name(address addr, char* buf, 55371088Sjasone int buflen, int* offset, 55483366Sjulian bool demangle = true); 55571088Sjasone 55671088Sjasone // Locate DLL/DSO. On success, full path of the library is copied to 55771088Sjasone // buf, and offset is optionally set to be the distance between addr 55871088Sjasone // and the library's base address. On failure, buf[0] is set to '\0' 55971088Sjasone // and offset is set to -1 (if offset is non-NULL). 56083366Sjulian static bool dll_address_to_library_name(address addr, char* buf, 56171088Sjasone int buflen, int* offset); 56283366Sjulian 56383366Sjulian // Find out whether the pc is in the static code for jvm.dll/libjvm.so. 56483366Sjulian static bool address_is_in_vm(address addr); 56572200Sbmilekic 56683366Sjulian // Loads .dll/.so and 56783366Sjulian // in case of error it checks if .dll/.so was built for the 56883366Sjulian // same architecture as HotSpot is running on 56983366Sjulian static void* dll_load(const char *name, char *ebuf, int ebuflen); 57083366Sjulian 57183366Sjulian // lookup symbol in a shared library 57271088Sjasone static void* dll_lookup(void* handle, const char* name); 57383366Sjulian 57483366Sjulian // Unload library 57582085Sjhb static void dll_unload(void *lib); 57683366Sjulian 57772200Sbmilekic // Callback for loaded module information 57871088Sjasone // Input parameters: 579 // char* module_file_name, 580 // address module_base_addr, 581 // address module_top_addr, 582 // void* param 583 typedef int (*LoadedModulesCallbackFunc)(const char *, address, address, void *); 584 585 static int get_loaded_modules_info(LoadedModulesCallbackFunc callback, void *param); 586 587 // Return the handle of this process 588 static void* get_default_process_handle(); 589 590 // Check for static linked agent library 591 static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[], 592 size_t syms_len); 593 594 // Find agent entry point 595 static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib, 596 const char *syms[], size_t syms_len); 597 598 // Write to stream 599 static int log_vsnprintf(char* buf, size_t len, const char* fmt, va_list args) ATTRIBUTE_PRINTF(3, 0); 600 601 // Get host name in buffer provided 602 static bool get_host_name(char* buf, size_t buflen); 603 604 // Print out system information; they are called by fatal error handler. 605 // Output format may be different on different platforms. 606 static void print_os_info(outputStream* st); 607 static void print_os_info_brief(outputStream* st); 608 static void print_cpu_info(outputStream* st, char* buf, size_t buflen); 609 static void pd_print_cpu_info(outputStream* st, char* buf, size_t buflen); 610 static void print_summary_info(outputStream* st, char* buf, size_t buflen); 611 static void print_memory_info(outputStream* st); 612 static void print_dll_info(outputStream* st); 613 static void print_environment_variables(outputStream* st, const char** env_list); 614 static void print_context(outputStream* st, const void* context); 615 static void print_register_info(outputStream* st, const void* context); 616 static void print_siginfo(outputStream* st, const void* siginfo); 617 static void print_signal_handlers(outputStream* st, char* buf, size_t buflen); 618 static void print_date_and_time(outputStream* st, char* buf, size_t buflen); 619 620 static void print_location(outputStream* st, intptr_t x, bool verbose = false); 621 static size_t lasterror(char *buf, size_t len); 622 static int get_last_error(); 623 624 // Replacement for strerror(). 625 // Will return the english description of the error (e.g. "File not found", as 626 // suggested in the POSIX standard. 627 // Will return "Unknown error" for an unknown errno value. 628 // Will not attempt to localize the returned string. 629 // Will always return a valid string which is a static constant. 630 // Will not change the value of errno. 631 static const char* strerror(int e); 632 633 // Will return the literalized version of the given errno (e.g. "EINVAL" 634 // for EINVAL). 635 // Will return "Unknown error" for an unknown errno value. 636 // Will always return a valid string which is a static constant. 637 // Will not change the value of errno. 638 static const char* errno_name(int e); 639 640 // Determines whether the calling process is being debugged by a user-mode debugger. 641 static bool is_debugger_attached(); 642 643 // wait for a key press if PauseAtExit is set 644 static void wait_for_keypress_at_exit(void); 645 646 // The following two functions are used by fatal error handler to trace 647 // native (C) frames. They are not part of frame.hpp/frame.cpp because 648 // frame.hpp/cpp assume thread is JavaThread, and also because different 649 // OS/compiler may have different convention or provide different API to 650 // walk C frames. 651 // 652 // We don't attempt to become a debugger, so we only follow frames if that 653 // does not require a lookup in the unwind table, which is part of the binary 654 // file but may be unsafe to read after a fatal error. So on x86, we can 655 // only walk stack if %ebp is used as frame pointer; on ia64, it's not 656 // possible to walk C stack without having the unwind table. 657 static bool is_first_C_frame(frame *fr); 658 static frame get_sender_for_C_frame(frame *fr); 659 660 // return current frame. pc() and sp() are set to NULL on failure. 661 static frame current_frame(); 662 663 static void print_hex_dump(outputStream* st, address start, address end, int unitsize); 664 665 // returns a string to describe the exception/signal; 666 // returns NULL if exception_code is not an OS exception/signal. 667 static const char* exception_name(int exception_code, char* buf, size_t buflen); 668 669 // Returns the signal number (e.g. 11) for a given signal name (SIGSEGV). 670 static int get_signal_number(const char* signal_name); 671 672 // Returns native Java library, loads if necessary 673 static void* native_java_library(); 674 675 // Fills in path to jvm.dll/libjvm.so (used by the Disassembler) 676 static void jvm_path(char *buf, jint buflen); 677 678 // Returns true if we are running in a headless jre. 679 static bool is_headless_jre(); 680 681 // JNI names 682 static void print_jni_name_prefix_on(outputStream* st, int args_size); 683 static void print_jni_name_suffix_on(outputStream* st, int args_size); 684 685 // Init os specific system properties values 686 static void init_system_properties_values(); 687 688 // IO operations, non-JVM_ version. 689 static int stat(const char* path, struct stat* sbuf); 690 static bool dir_is_empty(const char* path); 691 692 // IO operations on binary files 693 static int create_binary_file(const char* path, bool rewrite_existing); 694 static jlong current_file_offset(int fd); 695 static jlong seek_to_file_offset(int fd, jlong offset); 696 697 // Retrieve native stack frames. 698 // Parameter: 699 // stack: an array to storage stack pointers. 700 // frames: size of above array. 701 // toSkip: number of stack frames to skip at the beginning. 702 // Return: number of stack frames captured. 703 static int get_native_stack(address* stack, int size, int toSkip = 0); 704 705 // General allocation (must be MT-safe) 706 static void* malloc (size_t size, MEMFLAGS flags, const NativeCallStack& stack); 707 static void* malloc (size_t size, MEMFLAGS flags); 708 static void* realloc (void *memblock, size_t size, MEMFLAGS flag, const NativeCallStack& stack); 709 static void* realloc (void *memblock, size_t size, MEMFLAGS flag); 710 711 static void free (void *memblock); 712 static char* strdup(const char *, MEMFLAGS flags = mtInternal); // Like strdup 713 // Like strdup, but exit VM when strdup() returns NULL 714 static char* strdup_check_oom(const char*, MEMFLAGS flags = mtInternal); 715 716#ifndef PRODUCT 717 static julong num_mallocs; // # of calls to malloc/realloc 718 static julong alloc_bytes; // # of bytes allocated 719 static julong num_frees; // # of calls to free 720 static julong free_bytes; // # of bytes freed 721#endif 722 723 // SocketInterface (ex HPI SocketInterface ) 724 static int socket(int domain, int type, int protocol); 725 static int socket_close(int fd); 726 static int recv(int fd, char* buf, size_t nBytes, uint flags); 727 static int send(int fd, char* buf, size_t nBytes, uint flags); 728 static int raw_send(int fd, char* buf, size_t nBytes, uint flags); 729 static int connect(int fd, struct sockaddr* him, socklen_t len); 730 static struct hostent* get_host_by_name(char* name); 731 732 // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal) 733 static void signal_init(); 734 static void signal_init_pd(); 735 static void signal_notify(int signal_number); 736 static void* signal(int signal_number, void* handler); 737 static void signal_raise(int signal_number); 738 static int signal_wait(); 739 static int signal_lookup(); 740 static void* user_handler(); 741 static void terminate_signal_thread(); 742 static int sigexitnum_pd(); 743 744 // random number generation 745 static long random(); // return 32bit pseudorandom number 746 static void init_random(long initval); // initialize random sequence 747 748 // Structured OS Exception support 749 static void os_exception_wrapper(java_call_t f, JavaValue* value, const methodHandle& method, JavaCallArguments* args, Thread* thread); 750 751 // On Posix compatible OS it will simply check core dump limits while on Windows 752 // it will check if dump file can be created. Check or prepare a core dump to be 753 // taken at a later point in the same thread in os::abort(). Use the caller 754 // provided buffer as a scratch buffer. The status message which will be written 755 // into the error log either is file location or a short error message, depending 756 // on the checking result. 757 static void check_dump_limit(char* buffer, size_t bufferSize); 758 759 // Get the default path to the core file 760 // Returns the length of the string 761 static int get_core_path(char* buffer, size_t bufferSize); 762 763 // JVMTI & JVM monitoring and management support 764 // The thread_cpu_time() and current_thread_cpu_time() are only 765 // supported if is_thread_cpu_time_supported() returns true. 766 // They are not supported on Solaris T1. 767 768 // Thread CPU Time - return the fast estimate on a platform 769 // On Solaris - call gethrvtime (fast) - user time only 770 // On Linux - fast clock_gettime where available - user+sys 771 // - otherwise: very slow /proc fs - user+sys 772 // On Windows - GetThreadTimes - user+sys 773 static jlong current_thread_cpu_time(); 774 static jlong thread_cpu_time(Thread* t); 775 776 // Thread CPU Time with user_sys_cpu_time parameter. 777 // 778 // If user_sys_cpu_time is true, user+sys time is returned. 779 // Otherwise, only user time is returned 780 static jlong current_thread_cpu_time(bool user_sys_cpu_time); 781 static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time); 782 783 // Return a bunch of info about the timers. 784 // Note that the returned info for these two functions may be different 785 // on some platforms 786 static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 787 static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr); 788 789 static bool is_thread_cpu_time_supported(); 790 791 // System loadavg support. Returns -1 if load average cannot be obtained. 792 static int loadavg(double loadavg[], int nelem); 793 794 // Hook for os specific jvm options that we don't want to abort on seeing 795 static bool obsolete_option(const JavaVMOption *option); 796 797 // Amount beyond the callee frame size that we bang the stack. 798 static int extra_bang_size_in_bytes(); 799 800 static char** split_path(const char* path, int* n); 801 802 // Extensions 803#include "runtime/os_ext.hpp" 804 805 public: 806 class CrashProtectionCallback : public StackObj { 807 public: 808 virtual void call() = 0; 809 }; 810 811 // Platform dependent stuff 812#ifndef _WINDOWS 813# include "os_posix.hpp" 814#endif 815#include OS_CPU_HEADER(os) 816#include OS_HEADER(os) 817 818#ifndef OS_NATIVE_THREAD_CREATION_FAILED_MSG 819#define OS_NATIVE_THREAD_CREATION_FAILED_MSG "unable to create native thread: possibly out of memory or process/resource limits reached" 820#endif 821 822 public: 823#ifndef PLATFORM_PRINT_NATIVE_STACK 824 // No platform-specific code for printing the native stack. 825 static bool platform_print_native_stack(outputStream* st, const void* context, 826 char *buf, int buf_size) { 827 return false; 828 } 829#endif 830 831 // debugging support (mostly used by debug.cpp but also fatal error handler) 832 static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address 833 834 static bool dont_yield(); // when true, JVM_Yield() is nop 835 static void print_statistics(); 836 837 // Thread priority helpers (implemented in OS-specific part) 838 static OSReturn set_native_priority(Thread* thread, int native_prio); 839 static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr); 840 static int java_to_os_priority[CriticalPriority + 1]; 841 // Hint to the underlying OS that a task switch would not be good. 842 // Void return because it's a hint and can fail. 843 static void hint_no_preempt(); 844 static const char* native_thread_creation_failed_msg() { 845 return OS_NATIVE_THREAD_CREATION_FAILED_MSG; 846 } 847 848 // Used at creation if requested by the diagnostic flag PauseAtStartup. 849 // Causes the VM to wait until an external stimulus has been applied 850 // (for Unix, that stimulus is a signal, for Windows, an external 851 // ResumeThread call) 852 static void pause(); 853 854 // Builds a platform dependent Agent_OnLoad_<libname> function name 855 // which is used to find statically linked in agents. 856 static char* build_agent_function_name(const char *sym, const char *cname, 857 bool is_absolute_path); 858 859 class SuspendedThreadTaskContext { 860 public: 861 SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {} 862 Thread* thread() const { return _thread; } 863 void* ucontext() const { return _ucontext; } 864 private: 865 Thread* _thread; 866 void* _ucontext; 867 }; 868 869 class SuspendedThreadTask { 870 public: 871 SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {} 872 virtual ~SuspendedThreadTask() {} 873 void run(); 874 bool is_done() { return _done; } 875 virtual void do_task(const SuspendedThreadTaskContext& context) = 0; 876 protected: 877 private: 878 void internal_do_task(); 879 Thread* _thread; 880 bool _done; 881 }; 882 883#ifndef _WINDOWS 884 // Suspend/resume support 885 // Protocol: 886 // 887 // a thread starts in SR_RUNNING 888 // 889 // SR_RUNNING can go to 890 // * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it 891 // SR_SUSPEND_REQUEST can go to 892 // * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout) 893 // * SR_SUSPENDED if the stopped thread receives the signal and switches state 894 // SR_SUSPENDED can go to 895 // * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume 896 // SR_WAKEUP_REQUEST can go to 897 // * SR_RUNNING when the stopped thread receives the signal 898 // * SR_WAKEUP_REQUEST on timeout (resend the signal and try again) 899 class SuspendResume { 900 public: 901 enum State { 902 SR_RUNNING, 903 SR_SUSPEND_REQUEST, 904 SR_SUSPENDED, 905 SR_WAKEUP_REQUEST 906 }; 907 908 private: 909 volatile State _state; 910 911 private: 912 /* try to switch state from state "from" to state "to" 913 * returns the state set after the method is complete 914 */ 915 State switch_state(State from, State to); 916 917 public: 918 SuspendResume() : _state(SR_RUNNING) { } 919 920 State state() const { return _state; } 921 922 State request_suspend() { 923 return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST); 924 } 925 926 State cancel_suspend() { 927 return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING); 928 } 929 930 State suspended() { 931 return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED); 932 } 933 934 State request_wakeup() { 935 return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST); 936 } 937 938 State running() { 939 return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING); 940 } 941 942 bool is_running() const { 943 return _state == SR_RUNNING; 944 } 945 946 bool is_suspend_request() const { 947 return _state == SR_SUSPEND_REQUEST; 948 } 949 950 bool is_suspended() const { 951 return _state == SR_SUSPENDED; 952 } 953 }; 954#endif // !WINDOWS 955 956 957 protected: 958 static long _rand_seed; // seed for random number generator 959 static int _processor_count; // number of processors 960 static int _initial_active_processor_count; // number of active processors during initialization. 961 962 static char* format_boot_path(const char* format_string, 963 const char* home, 964 int home_len, 965 char fileSep, 966 char pathSep); 967 static bool set_boot_path(char fileSep, char pathSep); 968 969}; 970 971// Note that "PAUSE" is almost always used with synchronization 972// so arguably we should provide Atomic::SpinPause() instead 973// of the global SpinPause() with C linkage. 974// It'd also be eligible for inlining on many platforms. 975 976extern "C" int SpinPause(); 977 978#endif // SHARE_VM_RUNTIME_OS_HPP 979