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/*
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* Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// os defines the interface to operating system; this includes traditional
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// OS services (time, I/O) as well as other functionality with system-
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// dependent code.
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typedef void (*dll_func)(...);
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class Thread;
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class JavaThread;
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class Event;
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class DLL;
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class FileHandle;
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// %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
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// Platform-independent error return values from OS functions
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enum OSReturn {
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OS_OK = 0, // Operation was successful
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OS_ERR = -1, // Operation failed
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OS_INTRPT = -2, // Operation was interrupted
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OS_TIMEOUT = -3, // Operation timed out
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OS_NOMEM = -5, // Operation failed for lack of memory
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OS_NORESOURCE = -6 // Operation failed for lack of nonmemory resource
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};
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enum ThreadPriority { // JLS 20.20.1-3
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NoPriority = -1, // Initial non-priority value
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MinPriority = 1, // Minimum priority
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NormPriority = 5, // Normal (non-daemon) priority
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NearMaxPriority = 9, // High priority, used for VMThread
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MaxPriority = 10 // Highest priority, used for WatcherThread
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// ensures that VMThread doesn't starve profiler
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};
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// Typedef for structured exception handling support
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typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
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class os: AllStatic {
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private:
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enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
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static OSThread* _starting_thread;
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static address _polling_page;
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static volatile int32_t * _mem_serialize_page;
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static uintptr_t _serialize_page_mask;
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static volatile jlong _global_time;
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static volatile int _global_time_lock;
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static bool _use_global_time;
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static size_t _page_sizes[page_sizes_max];
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static void init_page_sizes(size_t default_page_size) {
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_page_sizes[0] = default_page_size;
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_page_sizes[1] = 0; // sentinel
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}
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public:
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static void init(void); // Called before command line parsing
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static jint init_2(void); // Called after command line parsing
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// File names are case-insensitive on windows only
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// Override me as needed
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static int file_name_strcmp(const char* s1, const char* s2);
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static bool getenv(const char* name, char* buffer, int len);
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static bool have_special_privileges();
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static jlong timeofday();
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static void enable_global_time() { _use_global_time = true; }
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static void disable_global_time() { _use_global_time = false; }
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static jlong read_global_time();
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static void update_global_time();
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static jlong javaTimeMillis();
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static jlong javaTimeNanos();
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static void javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
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static void run_periodic_checks();
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// Returns the elapsed time in seconds since the vm started.
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static double elapsedTime();
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// Returns real time in seconds since an arbitrary point
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// in the past.
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static bool getTimesSecs(double* process_real_time,
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double* process_user_time,
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double* process_system_time);
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// Interface to the performance counter
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static jlong elapsed_counter();
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static jlong elapsed_frequency();
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// Return current local time in a string (YYYY-MM-DD HH:MM:SS).
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// It is MT safe, but not async-safe, as reading time zone
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// information may require a lock on some platforms.
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static char* local_time_string(char *buf, size_t buflen);
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// Fill in buffer with current local time as an ISO-8601 string.
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// E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
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// Returns buffer, or NULL if it failed.
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static char* iso8601_time(char* buffer, size_t buffer_length);
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// Interface for detecting multiprocessor system
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static inline bool is_MP() {
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assert(_processor_count > 0, "invalid processor count");
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return _processor_count > 1;
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}
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static julong available_memory();
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static julong physical_memory();
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static julong allocatable_physical_memory(julong size);
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static bool is_server_class_machine();
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// number of CPUs
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static int processor_count() {
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return _processor_count;
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}
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// Returns the number of CPUs this process is currently allowed to run on.
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// Note that on some OSes this can change dynamically.
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static int active_processor_count();
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// Bind processes to processors.
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// This is a two step procedure:
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// first you generate a distribution of processes to processors,
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// then you bind processes according to that distribution.
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// Compute a distribution for number of processes to processors.
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// Stores the processor id's into the distribution array argument.
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// Returns true if it worked, false if it didn't.
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static bool distribute_processes(uint length, uint* distribution);
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// Binds the current process to a processor.
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// Returns true if it worked, false if it didn't.
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static bool bind_to_processor(uint processor_id);
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// Interface for stack banging (predetect possible stack overflow for
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// exception processing) There are guard pages, and above that shadow
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// pages for stack overflow checking.
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static bool uses_stack_guard_pages();
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static bool allocate_stack_guard_pages();
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static void bang_stack_shadow_pages();
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static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
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// OS interface to Virtual Memory
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// Return the default page size.
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static int vm_page_size();
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// Return the page size to use for a region of memory. The min_pages argument
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// is a hint intended to limit fragmentation; it says the returned page size
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// should be <= region_max_size / min_pages. Because min_pages is a hint,
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// this routine may return a size larger than region_max_size / min_pages.
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//
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// The current implementation ignores min_pages if a larger page size is an
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// exact multiple of both region_min_size and region_max_size. This allows
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// larger pages to be used when doing so would not cause fragmentation; in
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// particular, a single page can be used when region_min_size ==
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// region_max_size == a supported page size.
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static size_t page_size_for_region(size_t region_min_size,
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size_t region_max_size,
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uint min_pages);
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// Method for tracing page sizes returned by the above method; enabled by
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// TracePageSizes. The region_{min,max}_size parameters should be the values
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// passed to page_size_for_region() and page_size should be the result of that
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// call. The (optional) base and size parameters should come from the
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// ReservedSpace base() and size() methods.
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static void trace_page_sizes(const char* str, const size_t region_min_size,
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const size_t region_max_size,
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const size_t page_size,
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const char* base = NULL,
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const size_t size = 0) PRODUCT_RETURN;
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static int vm_allocation_granularity();
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static char* reserve_memory(size_t bytes, char* addr = 0,
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size_t alignment_hint = 0);
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static char* attempt_reserve_memory_at(size_t bytes, char* addr);
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static void split_reserved_memory(char *base, size_t size,
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size_t split, bool realloc);
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static bool commit_memory(char* addr, size_t bytes);
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static bool commit_memory(char* addr, size_t size, size_t alignment_hint);
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static bool uncommit_memory(char* addr, size_t bytes);
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static bool release_memory(char* addr, size_t bytes);
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static bool protect_memory(char* addr, size_t bytes);
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static bool guard_memory(char* addr, size_t bytes);
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static bool unguard_memory(char* addr, size_t bytes);
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static char* map_memory(int fd, const char* file_name, size_t file_offset,
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char *addr, size_t bytes, bool read_only = false,
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bool allow_exec = false);
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static char* remap_memory(int fd, const char* file_name, size_t file_offset,
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char *addr, size_t bytes, bool read_only,
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bool allow_exec);
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static bool unmap_memory(char *addr, size_t bytes);
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static void free_memory(char *addr, size_t bytes);
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static void realign_memory(char *addr, size_t bytes, size_t alignment_hint);
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// NUMA-specific interface
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static void numa_make_local(char *addr, size_t bytes);
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static void numa_make_global(char *addr, size_t bytes);
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static size_t numa_get_groups_num();
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static size_t numa_get_leaf_groups(int *ids, size_t size);
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static bool numa_topology_changed();
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static int numa_get_group_id();
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// Page manipulation
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struct page_info {
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size_t size;
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int lgrp_id;
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};
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static bool get_page_info(char *start, page_info* info);
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static char* scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
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static char* non_memory_address_word();
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// reserve, commit and pin the entire memory region
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static char* reserve_memory_special(size_t size);
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static bool release_memory_special(char* addr, size_t bytes);
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static bool large_page_init();
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static size_t large_page_size();
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static bool can_commit_large_page_memory();
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// OS interface to polling page
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static address get_polling_page() { return _polling_page; }
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static void set_polling_page(address page) { _polling_page = page; }
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static bool is_poll_address(address addr) { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
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static void make_polling_page_unreadable();
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static void make_polling_page_readable();
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// Routines used to serialize the thread state without using membars
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static void serialize_thread_states();
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// Since we write to the serialize page from every thread, we
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// want stores to be on unique cache lines whenever possible
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// in order to minimize CPU cross talk. We pre-compute the
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// amount to shift the thread* to make this offset unique to
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// each thread.
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static int get_serialize_page_shift_count() {
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return SerializePageShiftCount;
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}
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static void set_serialize_page_mask(uintptr_t mask) {
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_serialize_page_mask = mask;
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}
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static unsigned int get_serialize_page_mask() {
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return _serialize_page_mask;
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}
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static void set_memory_serialize_page(address page);
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static address get_memory_serialize_page() {
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return (address)_mem_serialize_page;
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}
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static inline void write_memory_serialize_page(JavaThread *thread) {
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uintptr_t page_offset = ((uintptr_t)thread >>
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get_serialize_page_shift_count()) &
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get_serialize_page_mask();
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*(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
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}
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static bool is_memory_serialize_page(JavaThread *thread, address addr) {
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address thr_addr;
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if (UseMembar) return false;
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// Calculate thread specific address
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if (thread == NULL) return false;
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// TODO-FIXME: some platforms mask off faulting addresses to the base pagesize.
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// Instead of using a test for equality we should probably use something
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// of the form:
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// return ((_mem_serialize_page ^ addr) & -pagesize) == 0
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//
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thr_addr = (address)(((uintptr_t)thread >>
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get_serialize_page_shift_count()) &
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get_serialize_page_mask()) + (uintptr_t)_mem_serialize_page;
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return (thr_addr == addr);
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}
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static void block_on_serialize_page_trap();
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// threads
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enum ThreadType {
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vm_thread,
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cgc_thread, // Concurrent GC thread
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pgc_thread, // Parallel GC thread
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java_thread,
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compiler_thread,
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watcher_thread
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};
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static bool create_thread(Thread* thread,
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ThreadType thr_type,
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size_t stack_size = 0);
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static bool create_main_thread(JavaThread* thread);
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static bool create_attached_thread(JavaThread* thread);
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static void pd_start_thread(Thread* thread);
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static void start_thread(Thread* thread);
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static void initialize_thread();
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static void free_thread(OSThread* osthread);
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// thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
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static intx current_thread_id();
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static int current_process_id();
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// hpi::read for calls from non native state
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// For performance, hpi::read is only callable from _thread_in_native
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static size_t read(int fd, void *buf, unsigned int nBytes);
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static int sleep(Thread* thread, jlong ms, bool interruptable);
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static int naked_sleep();
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static void infinite_sleep(); // never returns, use with CAUTION
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static void yield(); // Yields to all threads with same priority
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enum YieldResult {
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YIELD_SWITCHED = 1, // caller descheduled, other ready threads exist & ran
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YIELD_NONEREADY = 0, // No other runnable/ready threads.
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// platform-specific yield return immediately
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YIELD_UNKNOWN = -1 // Unknown: platform doesn't support _SWITCHED or _NONEREADY
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// YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
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// yield that can be used in lieu of blocking.
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} ;
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static YieldResult NakedYield () ;
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static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
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static void loop_breaker(int attempts); // called from within tight loops to possibly influence time-sharing
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static OSReturn set_priority(Thread* thread, ThreadPriority priority);
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static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
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static void interrupt(Thread* thread);
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static bool is_interrupted(Thread* thread, bool clear_interrupted);
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static int pd_self_suspend_thread(Thread* thread);
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static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
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static frame fetch_frame_from_context(void* ucVoid);
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static ExtendedPC get_thread_pc(Thread *thread);
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static void breakpoint();
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static address current_stack_pointer();
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static address current_stack_base();
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static size_t current_stack_size();
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static int message_box(const char* title, const char* message);
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static char* do_you_want_to_debug(const char* message);
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// run cmd in a separate process and return its exit code; or -1 on failures
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static int fork_and_exec(char *cmd);
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// Set file to send error reports.
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static void set_error_file(const char *logfile);
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// os::exit() is merged with vm_exit()
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// static void exit(int num);
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// Terminate the VM, but don't exit the process
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static void shutdown();
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// Terminate with an error. Default is to generate a core file on platforms
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// that support such things. This calls shutdown() and then aborts.
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static void abort(bool dump_core = true);
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// Die immediately, no exit hook, no abort hook, no cleanup.
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static void die();
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381 |
// Reading directories.
|
|
382 |
static DIR* opendir(const char* dirname);
|
|
383 |
static int readdir_buf_size(const char *path);
|
|
384 |
static struct dirent* readdir(DIR* dirp, dirent* dbuf);
|
|
385 |
static int closedir(DIR* dirp);
|
|
386 |
|
|
387 |
// Dynamic library extension
|
|
388 |
static const char* dll_file_extension();
|
|
389 |
|
|
390 |
static const char* get_temp_directory();
|
|
391 |
static const char* get_current_directory(char *buf, int buflen);
|
|
392 |
|
|
393 |
// Symbol lookup, find nearest function name; basically it implements
|
|
394 |
// dladdr() for all platforms. Name of the nearest function is copied
|
|
395 |
// to buf. Distance from its base address is returned as offset.
|
|
396 |
// If function name is not found, buf[0] is set to '\0' and offset is
|
|
397 |
// set to -1.
|
|
398 |
static bool dll_address_to_function_name(address addr, char* buf,
|
|
399 |
int buflen, int* offset);
|
|
400 |
|
|
401 |
// Locate DLL/DSO. On success, full path of the library is copied to
|
|
402 |
// buf, and offset is set to be the distance between addr and the
|
|
403 |
// library's base address. On failure, buf[0] is set to '\0' and
|
|
404 |
// offset is set to -1.
|
|
405 |
static bool dll_address_to_library_name(address addr, char* buf,
|
|
406 |
int buflen, int* offset);
|
|
407 |
|
|
408 |
// Find out whether the pc is in the static code for jvm.dll/libjvm.so.
|
|
409 |
static bool address_is_in_vm(address addr);
|
|
410 |
|
|
411 |
// Loads .dll/.so and
|
|
412 |
// in case of error it checks if .dll/.so was built for the
|
|
413 |
// same architecture as Hotspot is running on
|
|
414 |
static void* dll_load(const char *name, char *ebuf, int ebuflen);
|
|
415 |
|
|
416 |
// Print out system information; they are called by fatal error handler.
|
|
417 |
// Output format may be different on different platforms.
|
|
418 |
static void print_os_info(outputStream* st);
|
|
419 |
static void print_cpu_info(outputStream* st);
|
|
420 |
static void print_memory_info(outputStream* st);
|
|
421 |
static void print_dll_info(outputStream* st);
|
|
422 |
static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
|
|
423 |
static void print_context(outputStream* st, void* context);
|
|
424 |
static void print_siginfo(outputStream* st, void* siginfo);
|
|
425 |
static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
|
|
426 |
static void print_date_and_time(outputStream* st);
|
|
427 |
|
|
428 |
// The following two functions are used by fatal error handler to trace
|
|
429 |
// native (C) frames. They are not part of frame.hpp/frame.cpp because
|
|
430 |
// frame.hpp/cpp assume thread is JavaThread, and also because different
|
|
431 |
// OS/compiler may have different convention or provide different API to
|
|
432 |
// walk C frames.
|
|
433 |
//
|
|
434 |
// We don't attempt to become a debugger, so we only follow frames if that
|
|
435 |
// does not require a lookup in the unwind table, which is part of the binary
|
|
436 |
// file but may be unsafe to read after a fatal error. So on x86, we can
|
|
437 |
// only walk stack if %ebp is used as frame pointer; on ia64, it's not
|
|
438 |
// possible to walk C stack without having the unwind table.
|
|
439 |
static bool is_first_C_frame(frame *fr);
|
|
440 |
static frame get_sender_for_C_frame(frame *fr);
|
|
441 |
|
|
442 |
// return current frame. pc() and sp() are set to NULL on failure.
|
|
443 |
static frame current_frame();
|
|
444 |
|
|
445 |
static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
|
|
446 |
|
|
447 |
// returns a string to describe the exception/signal;
|
|
448 |
// returns NULL if exception_code is not an OS exception/signal.
|
|
449 |
static const char* exception_name(int exception_code, char* buf, size_t buflen);
|
|
450 |
|
|
451 |
// Returns native Java library, loads if necessary
|
|
452 |
static void* native_java_library();
|
|
453 |
|
|
454 |
// Fills in path to jvm.dll/libjvm.so (this info used to find hpi).
|
|
455 |
static void jvm_path(char *buf, jint buflen);
|
|
456 |
|
|
457 |
// JNI names
|
|
458 |
static void print_jni_name_prefix_on(outputStream* st, int args_size);
|
|
459 |
static void print_jni_name_suffix_on(outputStream* st, int args_size);
|
|
460 |
|
|
461 |
// File conventions
|
|
462 |
static const char* file_separator();
|
|
463 |
static const char* line_separator();
|
|
464 |
static const char* path_separator();
|
|
465 |
|
|
466 |
// Init os specific system properties values
|
|
467 |
static void init_system_properties_values();
|
|
468 |
|
|
469 |
// IO operations, non-JVM_ version.
|
|
470 |
static int stat(const char* path, struct stat* sbuf);
|
|
471 |
static bool dir_is_empty(const char* path);
|
|
472 |
|
|
473 |
// IO operations on binary files
|
|
474 |
static int create_binary_file(const char* path, bool rewrite_existing);
|
|
475 |
static jlong current_file_offset(int fd);
|
|
476 |
static jlong seek_to_file_offset(int fd, jlong offset);
|
|
477 |
|
|
478 |
// Thread Local Storage
|
|
479 |
static int allocate_thread_local_storage();
|
|
480 |
static void thread_local_storage_at_put(int index, void* value);
|
|
481 |
static void* thread_local_storage_at(int index);
|
|
482 |
static void free_thread_local_storage(int index);
|
|
483 |
|
|
484 |
// General allocation (must be MT-safe)
|
|
485 |
static void* malloc (size_t size);
|
|
486 |
static void* realloc (void *memblock, size_t size);
|
|
487 |
static void free (void *memblock);
|
|
488 |
static bool check_heap(bool force = false); // verify C heap integrity
|
|
489 |
static char* strdup(const char *); // Like strdup
|
|
490 |
|
|
491 |
#ifndef PRODUCT
|
|
492 |
static int num_mallocs; // # of calls to malloc/realloc
|
|
493 |
static size_t alloc_bytes; // # of bytes allocated
|
|
494 |
static int num_frees; // # of calls to free
|
|
495 |
#endif
|
|
496 |
|
|
497 |
// Printing 64 bit integers
|
|
498 |
static const char* jlong_format_specifier();
|
|
499 |
static const char* julong_format_specifier();
|
|
500 |
|
|
501 |
// Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
|
|
502 |
static void signal_init();
|
|
503 |
static void signal_init_pd();
|
|
504 |
static void signal_notify(int signal_number);
|
|
505 |
static void* signal(int signal_number, void* handler);
|
|
506 |
static void signal_raise(int signal_number);
|
|
507 |
static int signal_wait();
|
|
508 |
static int signal_lookup();
|
|
509 |
static void* user_handler();
|
|
510 |
static void terminate_signal_thread();
|
|
511 |
static int sigexitnum_pd();
|
|
512 |
|
|
513 |
// random number generation
|
|
514 |
static long random(); // return 32bit pseudorandom number
|
|
515 |
static void init_random(long initval); // initialize random sequence
|
|
516 |
|
|
517 |
// Structured OS Exception support
|
|
518 |
static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
|
|
519 |
|
|
520 |
// JVMTI & JVM monitoring and management support
|
|
521 |
// The thread_cpu_time() and current_thread_cpu_time() are only
|
|
522 |
// supported if is_thread_cpu_time_supported() returns true.
|
|
523 |
// They are not supported on Solaris T1.
|
|
524 |
|
|
525 |
// Thread CPU Time - return the fast estimate on a platform
|
|
526 |
// On Solaris - call gethrvtime (fast) - user time only
|
|
527 |
// On Linux - fast clock_gettime where available - user+sys
|
|
528 |
// - otherwise: very slow /proc fs - user+sys
|
|
529 |
// On Windows - GetThreadTimes - user+sys
|
|
530 |
static jlong current_thread_cpu_time();
|
|
531 |
static jlong thread_cpu_time(Thread* t);
|
|
532 |
|
|
533 |
// Thread CPU Time with user_sys_cpu_time parameter.
|
|
534 |
//
|
|
535 |
// If user_sys_cpu_time is true, user+sys time is returned.
|
|
536 |
// Otherwise, only user time is returned
|
|
537 |
static jlong current_thread_cpu_time(bool user_sys_cpu_time);
|
|
538 |
static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
|
|
539 |
|
|
540 |
// Return a bunch of info about the timers.
|
|
541 |
// Note that the returned info for these two functions may be different
|
|
542 |
// on some platforms
|
|
543 |
static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
|
|
544 |
static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
|
|
545 |
|
|
546 |
static bool is_thread_cpu_time_supported();
|
|
547 |
|
|
548 |
// System loadavg support. Returns -1 if load average cannot be obtained.
|
|
549 |
static int loadavg(double loadavg[], int nelem);
|
|
550 |
|
|
551 |
// Hook for os specific jvm options that we don't want to abort on seeing
|
|
552 |
static bool obsolete_option(const JavaVMOption *option);
|
|
553 |
|
|
554 |
// Platform dependent stuff
|
|
555 |
#include "incls/_os_pd.hpp.incl"
|
|
556 |
|
|
557 |
// debugging support (mostly used by debug.cpp)
|
|
558 |
static bool find(address pc) PRODUCT_RETURN0; // OS specific function to make sense out of an address
|
|
559 |
|
|
560 |
static bool dont_yield(); // when true, JVM_Yield() is nop
|
|
561 |
static void print_statistics();
|
|
562 |
|
|
563 |
// Thread priority helpers (implemented in OS-specific part)
|
|
564 |
static OSReturn set_native_priority(Thread* thread, int native_prio);
|
|
565 |
static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
|
|
566 |
static int java_to_os_priority[MaxPriority + 1];
|
|
567 |
// Hint to the underlying OS that a task switch would not be good.
|
|
568 |
// Void return because it's a hint and can fail.
|
|
569 |
static void hint_no_preempt();
|
|
570 |
|
|
571 |
// Used at creation if requested by the diagnostic flag PauseAtStartup.
|
|
572 |
// Causes the VM to wait until an external stimulus has been applied
|
|
573 |
// (for Unix, that stimulus is a signal, for Windows, an external
|
|
574 |
// ResumeThread call)
|
|
575 |
static void pause();
|
|
576 |
|
|
577 |
protected:
|
|
578 |
static long _rand_seed; // seed for random number generator
|
|
579 |
static int _processor_count; // number of processors
|
|
580 |
|
|
581 |
static char* format_boot_path(const char* format_string,
|
|
582 |
const char* home,
|
|
583 |
int home_len,
|
|
584 |
char fileSep,
|
|
585 |
char pathSep);
|
|
586 |
static bool set_boot_path(char fileSep, char pathSep);
|
|
587 |
};
|
|
588 |
|
|
589 |
// Note that "PAUSE" is almost always used with synchronization
|
|
590 |
// so arguably we should provide Atomic::SpinPause() instead
|
|
591 |
// of the global SpinPause() with C linkage.
|
|
592 |
// It'd also be eligible for inlining on many platforms.
|
|
593 |
|
|
594 |
extern "C" int SpinPause () ;
|
|
595 |
extern "C" int SafeFetch32 (int * adr, int errValue) ;
|
|
596 |
extern "C" intptr_t SafeFetchN (intptr_t * adr, intptr_t errValue) ;
|