duke@435: /*
hseigel@4465:  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #ifndef SHARE_VM_RUNTIME_OS_HPP
stefank@2314: #define SHARE_VM_RUNTIME_OS_HPP
stefank@2314: 
stefank@2314: #include "jvmtifiles/jvmti.h"
stefank@2314: #include "runtime/atomic.hpp"
stefank@2314: #include "runtime/extendedPC.hpp"
stefank@2314: #include "runtime/handles.hpp"
stefank@2314: #include "utilities/top.hpp"
stefank@2314: #ifdef TARGET_OS_FAMILY_linux
stefank@2314: # include "jvm_linux.h"
rbackman@5424: # include <setjmp.h>
stefank@2314: #endif
stefank@2314: #ifdef TARGET_OS_FAMILY_solaris
stefank@2314: # include "jvm_solaris.h"
rbackman@5424: # include <setjmp.h>
stefank@2314: #endif
stefank@2314: #ifdef TARGET_OS_FAMILY_windows
stefank@2314: # include "jvm_windows.h"
stefank@2314: #endif
goetz@6461: #ifdef TARGET_OS_FAMILY_aix
goetz@6461: # include "jvm_aix.h"
goetz@6461: # include <setjmp.h>
goetz@6461: #endif
never@3156: #ifdef TARGET_OS_FAMILY_bsd
never@3156: # include "jvm_bsd.h"
rbackman@5424: # include <setjmp.h>
never@3156: #endif
stefank@2314: 
bpittore@5585: class AgentLibrary;
bpittore@5585: 
duke@435: // os defines the interface to operating system; this includes traditional
duke@435: // OS services (time, I/O) as well as other functionality with system-
duke@435: // dependent code.
duke@435: 
duke@435: typedef void (*dll_func)(...);
duke@435: 
duke@435: class Thread;
duke@435: class JavaThread;
duke@435: class Event;
duke@435: class DLL;
duke@435: class FileHandle;
iveresov@576: template<class E> class GrowableArray;
duke@435: 
duke@435: // %%%%% Moved ThreadState, START_FN, OSThread to new osThread.hpp. -- Rose
duke@435: 
duke@435: // Platform-independent error return values from OS functions
duke@435: enum OSReturn {
duke@435:   OS_OK         =  0,        // Operation was successful
duke@435:   OS_ERR        = -1,        // Operation failed
duke@435:   OS_INTRPT     = -2,        // Operation was interrupted
duke@435:   OS_TIMEOUT    = -3,        // Operation timed out
duke@435:   OS_NOMEM      = -5,        // Operation failed for lack of memory
duke@435:   OS_NORESOURCE = -6         // Operation failed for lack of nonmemory resource
duke@435: };
duke@435: 
duke@435: enum ThreadPriority {        // JLS 20.20.1-3
duke@435:   NoPriority       = -1,     // Initial non-priority value
duke@435:   MinPriority      =  1,     // Minimum priority
duke@435:   NormPriority     =  5,     // Normal (non-daemon) priority
duke@435:   NearMaxPriority  =  9,     // High priority, used for VMThread
phh@3481:   MaxPriority      = 10,     // Highest priority, used for WatcherThread
duke@435:                              // ensures that VMThread doesn't starve profiler
phh@3481:   CriticalPriority = 11      // Critical thread priority
duke@435: };
duke@435: 
dcubed@5255: // Executable parameter flag for os::commit_memory() and
dcubed@5255: // os::commit_memory_or_exit().
dcubed@5255: const bool ExecMem = true;
dcubed@5255: 
duke@435: // Typedef for structured exception handling support
duke@435: typedef void (*java_call_t)(JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
duke@435: 
duke@435: class os: AllStatic {
twisti@5726:   friend class VMStructs;
twisti@5726: 
phh@1558:  public:
duke@435:   enum { page_sizes_max = 9 }; // Size of _page_sizes array (8 plus a sentinel)
duke@435: 
phh@1558:  private:
duke@435:   static OSThread*          _starting_thread;
duke@435:   static address            _polling_page;
duke@435:   static volatile int32_t * _mem_serialize_page;
duke@435:   static uintptr_t          _serialize_page_mask;
phh@1558:  public:
duke@435:   static size_t             _page_sizes[page_sizes_max];
duke@435: 
phh@1558:  private:
duke@435:   static void init_page_sizes(size_t default_page_size) {
duke@435:     _page_sizes[0] = default_page_size;
duke@435:     _page_sizes[1] = 0; // sentinel
duke@435:   }
duke@435: 
zgu@3900:   static char*  pd_reserve_memory(size_t bytes, char* addr = 0,
zgu@3900:                                size_t alignment_hint = 0);
zgu@3900:   static char*  pd_attempt_reserve_memory_at(size_t bytes, char* addr);
zgu@3900:   static void   pd_split_reserved_memory(char *base, size_t size,
zgu@3900:                                       size_t split, bool realloc);
dcubed@5255:   static bool   pd_commit_memory(char* addr, size_t bytes, bool executable);
zgu@3900:   static bool   pd_commit_memory(char* addr, size_t size, size_t alignment_hint,
dcubed@5255:                                  bool executable);
dcubed@5255:   // Same as pd_commit_memory() that either succeeds or calls
dcubed@5255:   // vm_exit_out_of_memory() with the specified mesg.
dcubed@5255:   static void   pd_commit_memory_or_exit(char* addr, size_t bytes,
dcubed@5255:                                          bool executable, const char* mesg);
dcubed@5255:   static void   pd_commit_memory_or_exit(char* addr, size_t size,
dcubed@5255:                                          size_t alignment_hint,
dcubed@5255:                                          bool executable, const char* mesg);
zgu@3900:   static bool   pd_uncommit_memory(char* addr, size_t bytes);
zgu@3900:   static bool   pd_release_memory(char* addr, size_t bytes);
zgu@3900: 
zgu@3900:   static char*  pd_map_memory(int fd, const char* file_name, size_t file_offset,
zgu@3900:                            char *addr, size_t bytes, bool read_only = false,
zgu@3900:                            bool allow_exec = false);
zgu@3900:   static char*  pd_remap_memory(int fd, const char* file_name, size_t file_offset,
zgu@3900:                              char *addr, size_t bytes, bool read_only,
zgu@3900:                              bool allow_exec);
zgu@3900:   static bool   pd_unmap_memory(char *addr, size_t bytes);
zgu@3900:   static void   pd_free_memory(char *addr, size_t bytes, size_t alignment_hint);
zgu@3900:   static void   pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint);
zgu@3900: 
zgu@3900: 
duke@435:  public:
bobv@2036:   static void init(void);                      // Called before command line parsing
tschatzl@5701:   static void init_before_ergo(void);          // Called after command line parsing
tschatzl@5701:                                                // before VM ergonomics processing.
bobv@2036:   static jint init_2(void);                    // Called after command line parsing
tschatzl@5701:                                                // and VM ergonomics processing
phh@3378:   static void init_globals(void) {             // Called from init_globals() in init.cpp
phh@3378:     init_globals_ext();
phh@3378:   }
bobv@2036:   static void init_3(void);                    // Called at the end of vm init
duke@435: 
duke@435:   // File names are case-insensitive on windows only
duke@435:   // Override me as needed
duke@435:   static int    file_name_strcmp(const char* s1, const char* s2);
duke@435: 
duke@435:   static bool getenv(const char* name, char* buffer, int len);
duke@435:   static bool have_special_privileges();
duke@435: 
duke@435:   static jlong  javaTimeMillis();
duke@435:   static jlong  javaTimeNanos();
duke@435:   static void   javaTimeNanos_info(jvmtiTimerInfo *info_ptr);
duke@435:   static void   run_periodic_checks();
duke@435: 
duke@435: 
duke@435:   // Returns the elapsed time in seconds since the vm started.
duke@435:   static double elapsedTime();
duke@435: 
duke@435:   // Returns real time in seconds since an arbitrary point
duke@435:   // in the past.
duke@435:   static bool getTimesSecs(double* process_real_time,
duke@435:                            double* process_user_time,
duke@435:                            double* process_system_time);
duke@435: 
duke@435:   // Interface to the performance counter
duke@435:   static jlong elapsed_counter();
duke@435:   static jlong elapsed_frequency();
duke@435: 
ysr@777:   // The "virtual time" of a thread is the amount of time a thread has
ysr@777:   // actually run.  The first function indicates whether the OS supports
ysr@777:   // this functionality for the current thread, and if so:
ysr@777:   //   * the second enables vtime tracking (if that is required).
ysr@777:   //   * the third tells whether vtime is enabled.
ysr@777:   //   * the fourth returns the elapsed virtual time for the current
ysr@777:   //     thread.
ysr@777:   static bool supports_vtime();
ysr@777:   static bool enable_vtime();
ysr@777:   static bool vtime_enabled();
ysr@777:   static double elapsedVTime();
ysr@777: 
duke@435:   // Return current local time in a string (YYYY-MM-DD HH:MM:SS).
duke@435:   // It is MT safe, but not async-safe, as reading time zone
duke@435:   // information may require a lock on some platforms.
ysr@983:   static char*      local_time_string(char *buf, size_t buflen);
ysr@983:   static struct tm* localtime_pd     (const time_t* clock, struct tm*  res);
duke@435:   // Fill in buffer with current local time as an ISO-8601 string.
duke@435:   // E.g., YYYY-MM-DDThh:mm:ss.mmm+zzzz.
duke@435:   // Returns buffer, or NULL if it failed.
duke@435:   static char* iso8601_time(char* buffer, size_t buffer_length);
duke@435: 
duke@435:   // Interface for detecting multiprocessor system
duke@435:   static inline bool is_MP() {
duke@435:     assert(_processor_count > 0, "invalid processor count");
minqi@4845:     return _processor_count > 1 || AssumeMP;
duke@435:   }
duke@435:   static julong available_memory();
duke@435:   static julong physical_memory();
tschatzl@4854:   static bool has_allocatable_memory_limit(julong* limit);
duke@435:   static bool is_server_class_machine();
duke@435: 
duke@435:   // number of CPUs
duke@435:   static int processor_count() {
duke@435:     return _processor_count;
duke@435:   }
phh@1558:   static void set_processor_count(int count) { _processor_count = count; }
duke@435: 
duke@435:   // Returns the number of CPUs this process is currently allowed to run on.
duke@435:   // Note that on some OSes this can change dynamically.
duke@435:   static int active_processor_count();
duke@435: 
duke@435:   // Bind processes to processors.
duke@435:   //     This is a two step procedure:
duke@435:   //     first you generate a distribution of processes to processors,
duke@435:   //     then you bind processes according to that distribution.
duke@435:   // Compute a distribution for number of processes to processors.
duke@435:   //    Stores the processor id's into the distribution array argument.
duke@435:   //    Returns true if it worked, false if it didn't.
duke@435:   static bool distribute_processes(uint length, uint* distribution);
duke@435:   // Binds the current process to a processor.
duke@435:   //    Returns true if it worked, false if it didn't.
duke@435:   static bool bind_to_processor(uint processor_id);
duke@435: 
dcubed@3202:   // Give a name to the current thread.
dcubed@3202:   static void set_native_thread_name(const char *name);
dcubed@3202: 
duke@435:   // Interface for stack banging (predetect possible stack overflow for
duke@435:   // exception processing)  There are guard pages, and above that shadow
duke@435:   // pages for stack overflow checking.
duke@435:   static bool uses_stack_guard_pages();
duke@435:   static bool allocate_stack_guard_pages();
duke@435:   static void bang_stack_shadow_pages();
duke@435:   static bool stack_shadow_pages_available(Thread *thread, methodHandle method);
duke@435: 
duke@435:   // OS interface to Virtual Memory
duke@435: 
duke@435:   // Return the default page size.
duke@435:   static int    vm_page_size();
duke@435: 
duke@435:   // Return the page size to use for a region of memory.  The min_pages argument
duke@435:   // is a hint intended to limit fragmentation; it says the returned page size
duke@435:   // should be <= region_max_size / min_pages.  Because min_pages is a hint,
duke@435:   // this routine may return a size larger than region_max_size / min_pages.
duke@435:   //
duke@435:   // The current implementation ignores min_pages if a larger page size is an
duke@435:   // exact multiple of both region_min_size and region_max_size.  This allows
duke@435:   // larger pages to be used when doing so would not cause fragmentation; in
duke@435:   // particular, a single page can be used when region_min_size ==
duke@435:   // region_max_size == a supported page size.
duke@435:   static size_t page_size_for_region(size_t region_min_size,
duke@435:                                      size_t region_max_size,
duke@435:                                      uint min_pages);
tschatzl@5701:   // Return the largest page size that can be used
tschatzl@5701:   static size_t max_page_size() {
tschatzl@5701:     // The _page_sizes array is sorted in descending order.
tschatzl@5701:     return _page_sizes[0];
tschatzl@5701:   }
duke@435: 
jcoomes@3057:   // Methods for tracing page sizes returned by the above method; enabled by
duke@435:   // TracePageSizes.  The region_{min,max}_size parameters should be the values
duke@435:   // passed to page_size_for_region() and page_size should be the result of that
duke@435:   // call.  The (optional) base and size parameters should come from the
duke@435:   // ReservedSpace base() and size() methods.
jcoomes@3057:   static void trace_page_sizes(const char* str, const size_t* page_sizes,
jcoomes@3057:                                int count) PRODUCT_RETURN;
duke@435:   static void trace_page_sizes(const char* str, const size_t region_min_size,
duke@435:                                const size_t region_max_size,
duke@435:                                const size_t page_size,
duke@435:                                const char* base = NULL,
duke@435:                                const size_t size = 0) PRODUCT_RETURN;
duke@435: 
duke@435:   static int    vm_allocation_granularity();
duke@435:   static char*  reserve_memory(size_t bytes, char* addr = 0,
duke@435:                                size_t alignment_hint = 0);
zgu@5053:   static char*  reserve_memory(size_t bytes, char* addr,
zgu@5053:                                size_t alignment_hint, MEMFLAGS flags);
brutisso@4369:   static char*  reserve_memory_aligned(size_t size, size_t alignment);
duke@435:   static char*  attempt_reserve_memory_at(size_t bytes, char* addr);
duke@435:   static void   split_reserved_memory(char *base, size_t size,
duke@435:                                       size_t split, bool realloc);
dcubed@5255:   static bool   commit_memory(char* addr, size_t bytes, bool executable);
coleenp@1091:   static bool   commit_memory(char* addr, size_t size, size_t alignment_hint,
dcubed@5255:                               bool executable);
dcubed@5255:   // Same as commit_memory() that either succeeds or calls
dcubed@5255:   // vm_exit_out_of_memory() with the specified mesg.
dcubed@5255:   static void   commit_memory_or_exit(char* addr, size_t bytes,
dcubed@5255:                                       bool executable, const char* mesg);
dcubed@5255:   static void   commit_memory_or_exit(char* addr, size_t size,
dcubed@5255:                                       size_t alignment_hint,
dcubed@5255:                                       bool executable, const char* mesg);
duke@435:   static bool   uncommit_memory(char* addr, size_t bytes);
duke@435:   static bool   release_memory(char* addr, size_t bytes);
coleenp@672: 
coleenp@672:   enum ProtType { MEM_PROT_NONE, MEM_PROT_READ, MEM_PROT_RW, MEM_PROT_RWX };
coleenp@672:   static bool   protect_memory(char* addr, size_t bytes, ProtType prot,
coleenp@912:                                bool is_committed = true);
coleenp@672: 
duke@435:   static bool   guard_memory(char* addr, size_t bytes);
duke@435:   static bool   unguard_memory(char* addr, size_t bytes);
coleenp@1755:   static bool   create_stack_guard_pages(char* addr, size_t bytes);
zgu@3900:   static bool   pd_create_stack_guard_pages(char* addr, size_t bytes);
coleenp@1755:   static bool   remove_stack_guard_pages(char* addr, size_t bytes);
coleenp@1755: 
duke@435:   static char*  map_memory(int fd, const char* file_name, size_t file_offset,
duke@435:                            char *addr, size_t bytes, bool read_only = false,
duke@435:                            bool allow_exec = false);
duke@435:   static char*  remap_memory(int fd, const char* file_name, size_t file_offset,
duke@435:                              char *addr, size_t bytes, bool read_only,
duke@435:                              bool allow_exec);
duke@435:   static bool   unmap_memory(char *addr, size_t bytes);
iveresov@3363:   static void   free_memory(char *addr, size_t bytes, size_t alignment_hint);
duke@435:   static void   realign_memory(char *addr, size_t bytes, size_t alignment_hint);
duke@435: 
duke@435:   // NUMA-specific interface
iveresov@576:   static bool   numa_has_static_binding();
iveresov@576:   static bool   numa_has_group_homing();
iveresov@576:   static void   numa_make_local(char *addr, size_t bytes, int lgrp_hint);
duke@435:   static void   numa_make_global(char *addr, size_t bytes);
duke@435:   static size_t numa_get_groups_num();
duke@435:   static size_t numa_get_leaf_groups(int *ids, size_t size);
duke@435:   static bool   numa_topology_changed();
duke@435:   static int    numa_get_group_id();
duke@435: 
duke@435:   // Page manipulation
duke@435:   struct page_info {
duke@435:     size_t size;
duke@435:     int lgrp_id;
duke@435:   };
duke@435:   static bool   get_page_info(char *start, page_info* info);
duke@435:   static char*  scan_pages(char *start, char* end, page_info* page_expected, page_info* page_found);
duke@435: 
duke@435:   static char*  non_memory_address_word();
duke@435:   // reserve, commit and pin the entire memory region
stefank@5578:   static char*  reserve_memory_special(size_t size, size_t alignment,
stefank@5578:                                        char* addr, bool executable);
duke@435:   static bool   release_memory_special(char* addr, size_t bytes);
iveresov@2850:   static void   large_page_init();
duke@435:   static size_t large_page_size();
duke@435:   static bool   can_commit_large_page_memory();
jcoomes@514:   static bool   can_execute_large_page_memory();
duke@435: 
duke@435:   // OS interface to polling page
duke@435:   static address get_polling_page()             { return _polling_page; }
duke@435:   static void    set_polling_page(address page) { _polling_page = page; }
duke@435:   static bool    is_poll_address(address addr)  { return addr >= _polling_page && addr < (_polling_page + os::vm_page_size()); }
duke@435:   static void    make_polling_page_unreadable();
duke@435:   static void    make_polling_page_readable();
duke@435: 
duke@435:   // Routines used to serialize the thread state without using membars
duke@435:   static void    serialize_thread_states();
duke@435: 
duke@435:   // Since we write to the serialize page from every thread, we
duke@435:   // want stores to be on unique cache lines whenever possible
duke@435:   // in order to minimize CPU cross talk.  We pre-compute the
duke@435:   // amount to shift the thread* to make this offset unique to
duke@435:   // each thread.
duke@435:   static int     get_serialize_page_shift_count() {
duke@435:     return SerializePageShiftCount;
duke@435:   }
duke@435: 
duke@435:   static void     set_serialize_page_mask(uintptr_t mask) {
duke@435:     _serialize_page_mask = mask;
duke@435:   }
duke@435: 
duke@435:   static unsigned int  get_serialize_page_mask() {
duke@435:     return _serialize_page_mask;
duke@435:   }
duke@435: 
duke@435:   static void    set_memory_serialize_page(address page);
duke@435: 
duke@435:   static address get_memory_serialize_page() {
duke@435:     return (address)_mem_serialize_page;
duke@435:   }
duke@435: 
duke@435:   static inline void write_memory_serialize_page(JavaThread *thread) {
duke@435:     uintptr_t page_offset = ((uintptr_t)thread >>
duke@435:                             get_serialize_page_shift_count()) &
duke@435:                             get_serialize_page_mask();
duke@435:     *(volatile int32_t *)((uintptr_t)_mem_serialize_page+page_offset) = 1;
duke@435:   }
duke@435: 
duke@435:   static bool    is_memory_serialize_page(JavaThread *thread, address addr) {
duke@435:     if (UseMembar) return false;
twisti@1513:     // Previously this function calculated the exact address of this
twisti@1513:     // thread's serialize page, and checked if the faulting address
twisti@1513:     // was equal.  However, some platforms mask off faulting addresses
twisti@1513:     // to the page size, so now we just check that the address is
twisti@1513:     // within the page.  This makes the thread argument unnecessary,
twisti@1513:     // but we retain the NULL check to preserve existing behaviour.
duke@435:     if (thread == NULL) return false;
twisti@1513:     address page = (address) _mem_serialize_page;
twisti@1513:     return addr >= page && addr < (page + os::vm_page_size());
duke@435:   }
duke@435: 
duke@435:   static void block_on_serialize_page_trap();
duke@435: 
duke@435:   // threads
duke@435: 
duke@435:   enum ThreadType {
duke@435:     vm_thread,
duke@435:     cgc_thread,        // Concurrent GC thread
duke@435:     pgc_thread,        // Parallel GC thread
duke@435:     java_thread,
duke@435:     compiler_thread,
bobv@2036:     watcher_thread,
bobv@2036:     os_thread
duke@435:   };
duke@435: 
duke@435:   static bool create_thread(Thread* thread,
duke@435:                             ThreadType thr_type,
duke@435:                             size_t stack_size = 0);
duke@435:   static bool create_main_thread(JavaThread* thread);
duke@435:   static bool create_attached_thread(JavaThread* thread);
duke@435:   static void pd_start_thread(Thread* thread);
duke@435:   static void start_thread(Thread* thread);
duke@435: 
zgu@4079:   static void initialize_thread(Thread* thr);
duke@435:   static void free_thread(OSThread* osthread);
duke@435: 
duke@435:   // thread id on Linux/64bit is 64bit, on Windows and Solaris, it's 32bit
duke@435:   static intx current_thread_id();
duke@435:   static int current_process_id();
duke@435:   static int sleep(Thread* thread, jlong ms, bool interruptable);
dsimms@6348:   // Short standalone OS sleep suitable for slow path spin loop.
dsimms@6348:   // Ignores Thread.interrupt() (so keep it short).
dsimms@6348:   // ms = 0, will sleep for the least amount of time allowed by the OS.
dsimms@6348:   static void naked_short_sleep(jlong ms);
duke@435:   static void infinite_sleep(); // never returns, use with CAUTION
duke@435:   static void yield();        // Yields to all threads with same priority
duke@435:   enum YieldResult {
duke@435:     YIELD_SWITCHED = 1,         // caller descheduled, other ready threads exist & ran
duke@435:     YIELD_NONEREADY = 0,        // No other runnable/ready threads.
duke@435:                                 // platform-specific yield return immediately
duke@435:     YIELD_UNKNOWN = -1          // Unknown: platform doesn't support _SWITCHED or _NONEREADY
duke@435:     // YIELD_SWITCHED and YIELD_NONREADY imply the platform supports a "strong"
duke@435:     // yield that can be used in lieu of blocking.
duke@435:   } ;
duke@435:   static YieldResult NakedYield () ;
duke@435:   static void yield_all(int attempts = 0); // Yields to all other threads including lower priority
duke@435:   static void loop_breaker(int attempts);  // called from within tight loops to possibly influence time-sharing
duke@435:   static OSReturn set_priority(Thread* thread, ThreadPriority priority);
duke@435:   static OSReturn get_priority(const Thread* const thread, ThreadPriority& priority);
duke@435: 
duke@435:   static void interrupt(Thread* thread);
duke@435:   static bool is_interrupted(Thread* thread, bool clear_interrupted);
duke@435: 
duke@435:   static int pd_self_suspend_thread(Thread* thread);
duke@435: 
duke@435:   static ExtendedPC fetch_frame_from_context(void* ucVoid, intptr_t** sp, intptr_t** fp);
duke@435:   static frame      fetch_frame_from_context(void* ucVoid);
duke@435: 
duke@435:   static ExtendedPC get_thread_pc(Thread *thread);
duke@435:   static void breakpoint();
duke@435: 
duke@435:   static address current_stack_pointer();
duke@435:   static address current_stack_base();
duke@435:   static size_t current_stack_size();
duke@435: 
roland@3606:   static void verify_stack_alignment() PRODUCT_RETURN;
roland@3606: 
duke@435:   static int message_box(const char* title, const char* message);
duke@435:   static char* do_you_want_to_debug(const char* message);
duke@435: 
duke@435:   // run cmd in a separate process and return its exit code; or -1 on failures
duke@435:   static int fork_and_exec(char *cmd);
duke@435: 
duke@435:   // Set file to send error reports.
duke@435:   static void set_error_file(const char *logfile);
duke@435: 
duke@435:   // os::exit() is merged with vm_exit()
duke@435:   // static void exit(int num);
duke@435: 
duke@435:   // Terminate the VM, but don't exit the process
duke@435:   static void shutdown();
duke@435: 
duke@435:   // Terminate with an error.  Default is to generate a core file on platforms
duke@435:   // that support such things.  This calls shutdown() and then aborts.
duke@435:   static void abort(bool dump_core = true);
duke@435: 
duke@435:   // Die immediately, no exit hook, no abort hook, no cleanup.
duke@435:   static void die();
duke@435: 
ikrylov@2322:   // File i/o operations
ikrylov@2322:   static const int default_file_open_flags();
ikrylov@2322:   static int open(const char *path, int oflag, int mode);
vlivanov@5027:   static FILE* open(int fd, const char* mode);
ikrylov@2322:   static int close(int fd);
ikrylov@2322:   static jlong lseek(int fd, jlong offset, int whence);
ikrylov@2322:   static char* native_path(char *path);
ikrylov@2322:   static int ftruncate(int fd, jlong length);
ikrylov@2322:   static int fsync(int fd);
ikrylov@2322:   static int available(int fd, jlong *bytes);
ikrylov@2322: 
ikrylov@2322:   //File i/o operations
ikrylov@2322: 
ikrylov@2322:   static size_t read(int fd, void *buf, unsigned int nBytes);
ikrylov@2322:   static size_t restartable_read(int fd, void *buf, unsigned int nBytes);
ikrylov@2322:   static size_t write(int fd, const void *buf, unsigned int nBytes);
ikrylov@2322: 
duke@435:   // Reading directories.
duke@435:   static DIR*           opendir(const char* dirname);
duke@435:   static int            readdir_buf_size(const char *path);
duke@435:   static struct dirent* readdir(DIR* dirp, dirent* dbuf);
duke@435:   static int            closedir(DIR* dirp);
duke@435: 
duke@435:   // Dynamic library extension
duke@435:   static const char*    dll_file_extension();
duke@435: 
duke@435:   static const char*    get_temp_directory();
vlivanov@5027:   static const char*    get_current_directory(char *buf, size_t buflen);
duke@435: 
kamg@677:   // Builds a platform-specific full library path given a ld path and lib name
bpittore@4261:   // Returns true if buffer contains full path to existing file, false otherwise
bpittore@4261:   static bool           dll_build_name(char* buffer, size_t size,
kamg@677:                                        const char* pathname, const char* fname);
kamg@677: 
duke@435:   // Symbol lookup, find nearest function name; basically it implements
duke@435:   // dladdr() for all platforms. Name of the nearest function is copied
dcubed@5365:   // to buf. Distance from its base address is optionally returned as offset.
duke@435:   // If function name is not found, buf[0] is set to '\0' and offset is
dcubed@5365:   // set to -1 (if offset is non-NULL).
duke@435:   static bool dll_address_to_function_name(address addr, char* buf,
duke@435:                                            int buflen, int* offset);
duke@435: 
duke@435:   // Locate DLL/DSO. On success, full path of the library is copied to
dcubed@5365:   // buf, and offset is optionally set to be the distance between addr
dcubed@5365:   // and the library's base address. On failure, buf[0] is set to '\0'
dcubed@5365:   // and offset is set to -1 (if offset is non-NULL).
duke@435:   static bool dll_address_to_library_name(address addr, char* buf,
duke@435:                                           int buflen, int* offset);
duke@435: 
duke@435:   // Find out whether the pc is in the static code for jvm.dll/libjvm.so.
duke@435:   static bool address_is_in_vm(address addr);
duke@435: 
duke@435:   // Loads .dll/.so and
duke@435:   // in case of error it checks if .dll/.so was built for the
duke@435:   // same architecture as Hotspot is running on
duke@435:   static void* dll_load(const char *name, char *ebuf, int ebuflen);
duke@435: 
kamg@677:   // lookup symbol in a shared library
kamg@677:   static void* dll_lookup(void* handle, const char* name);
kamg@677: 
ikrylov@2322:   // Unload library
ikrylov@2322:   static void  dll_unload(void *lib);
ikrylov@2322: 
bpittore@5585:   // Return the handle of this process
bpittore@5585:   static void* get_default_process_handle();
bpittore@5585: 
bpittore@5585:   // Check for static linked agent library
bpittore@5585:   static bool find_builtin_agent(AgentLibrary *agent_lib, const char *syms[],
bpittore@5585:                                  size_t syms_len);
bpittore@5585: 
bpittore@5585:   // Find agent entry point
bpittore@5585:   static void *find_agent_function(AgentLibrary *agent_lib, bool check_lib,
bpittore@5585:                                    const char *syms[], size_t syms_len);
bpittore@5585: 
duke@435:   // Print out system information; they are called by fatal error handler.
duke@435:   // Output format may be different on different platforms.
duke@435:   static void print_os_info(outputStream* st);
nloodin@3783:   static void print_os_info_brief(outputStream* st);
duke@435:   static void print_cpu_info(outputStream* st);
jcoomes@2997:   static void pd_print_cpu_info(outputStream* st);
duke@435:   static void print_memory_info(outputStream* st);
duke@435:   static void print_dll_info(outputStream* st);
duke@435:   static void print_environment_variables(outputStream* st, const char** env_list, char* buffer, int len);
duke@435:   static void print_context(outputStream* st, void* context);
never@2262:   static void print_register_info(outputStream* st, void* context);
duke@435:   static void print_siginfo(outputStream* st, void* siginfo);
duke@435:   static void print_signal_handlers(outputStream* st, char* buf, size_t buflen);
duke@435:   static void print_date_and_time(outputStream* st);
duke@435: 
never@2262:   static void print_location(outputStream* st, intptr_t x, bool verbose = false);
ikrylov@2322:   static size_t lasterror(char *buf, size_t len);
phh@3379:   static int get_last_error();
bobv@2036: 
sla@2584:   // Determines whether the calling process is being debugged by a user-mode debugger.
sla@2584:   static bool is_debugger_attached();
sla@2584: 
sla@2584:   // wait for a key press if PauseAtExit is set
sla@2584:   static void wait_for_keypress_at_exit(void);
sla@2584: 
duke@435:   // The following two functions are used by fatal error handler to trace
duke@435:   // native (C) frames. They are not part of frame.hpp/frame.cpp because
duke@435:   // frame.hpp/cpp assume thread is JavaThread, and also because different
duke@435:   // OS/compiler may have different convention or provide different API to
duke@435:   // walk C frames.
duke@435:   //
duke@435:   // We don't attempt to become a debugger, so we only follow frames if that
duke@435:   // does not require a lookup in the unwind table, which is part of the binary
duke@435:   // file but may be unsafe to read after a fatal error. So on x86, we can
duke@435:   // only walk stack if %ebp is used as frame pointer; on ia64, it's not
duke@435:   // possible to walk C stack without having the unwind table.
duke@435:   static bool is_first_C_frame(frame *fr);
duke@435:   static frame get_sender_for_C_frame(frame *fr);
duke@435: 
duke@435:   // return current frame. pc() and sp() are set to NULL on failure.
duke@435:   static frame      current_frame();
duke@435: 
duke@435:   static void print_hex_dump(outputStream* st, address start, address end, int unitsize);
duke@435: 
duke@435:   // returns a string to describe the exception/signal;
duke@435:   // returns NULL if exception_code is not an OS exception/signal.
duke@435:   static const char* exception_name(int exception_code, char* buf, size_t buflen);
duke@435: 
duke@435:   // Returns native Java library, loads if necessary
duke@435:   static void*    native_java_library();
duke@435: 
ikrylov@2322:   // Fills in path to jvm.dll/libjvm.so (used by the Disassembler)
duke@435:   static void     jvm_path(char *buf, jint buflen);
duke@435: 
bobv@2036:   // Returns true if we are running in a headless jre.
bobv@2036:   static bool     is_headless_jre();
bobv@2036: 
duke@435:   // JNI names
duke@435:   static void     print_jni_name_prefix_on(outputStream* st, int args_size);
duke@435:   static void     print_jni_name_suffix_on(outputStream* st, int args_size);
duke@435: 
duke@435:   // File conventions
duke@435:   static const char* file_separator();
duke@435:   static const char* line_separator();
duke@435:   static const char* path_separator();
duke@435: 
duke@435:   // Init os specific system properties values
duke@435:   static void init_system_properties_values();
duke@435: 
duke@435:   // IO operations, non-JVM_ version.
duke@435:   static int stat(const char* path, struct stat* sbuf);
duke@435:   static bool dir_is_empty(const char* path);
duke@435: 
duke@435:   // IO operations on binary files
duke@435:   static int create_binary_file(const char* path, bool rewrite_existing);
duke@435:   static jlong current_file_offset(int fd);
duke@435:   static jlong seek_to_file_offset(int fd, jlong offset);
duke@435: 
duke@435:   // Thread Local Storage
duke@435:   static int   allocate_thread_local_storage();
duke@435:   static void  thread_local_storage_at_put(int index, void* value);
duke@435:   static void* thread_local_storage_at(int index);
duke@435:   static void  free_thread_local_storage(int index);
duke@435: 
zgu@3900:   // Stack walk
zgu@3900:   static address get_caller_pc(int n = 0);
zgu@3900: 
duke@435:   // General allocation (must be MT-safe)
zgu@3900:   static void* malloc  (size_t size, MEMFLAGS flags, address caller_pc = 0);
zgu@3900:   static void* realloc (void *memblock, size_t size, MEMFLAGS flags, address caller_pc = 0);
zgu@3900:   static void  free    (void *memblock, MEMFLAGS flags = mtNone);
duke@435:   static bool  check_heap(bool force = false);      // verify C heap integrity
zgu@3900:   static char* strdup(const char *, MEMFLAGS flags = mtInternal);  // Like strdup
duke@435: 
duke@435: #ifndef PRODUCT
kvn@2557:   static julong num_mallocs;         // # of calls to malloc/realloc
kvn@2557:   static julong alloc_bytes;         // # of bytes allocated
kvn@2557:   static julong num_frees;           // # of calls to free
kvn@2557:   static julong free_bytes;          // # of bytes freed
duke@435: #endif
duke@435: 
ikrylov@2322:   // SocketInterface (ex HPI SocketInterface )
ikrylov@2322:   static int socket(int domain, int type, int protocol);
ikrylov@2322:   static int socket_close(int fd);
ikrylov@2322:   static int socket_shutdown(int fd, int howto);
phh@3344:   static int recv(int fd, char* buf, size_t nBytes, uint flags);
phh@3344:   static int send(int fd, char* buf, size_t nBytes, uint flags);
phh@3344:   static int raw_send(int fd, char* buf, size_t nBytes, uint flags);
ikrylov@2322:   static int timeout(int fd, long timeout);
ikrylov@2322:   static int listen(int fd, int count);
phh@3344:   static int connect(int fd, struct sockaddr* him, socklen_t len);
phh@3344:   static int bind(int fd, struct sockaddr* him, socklen_t len);
phh@3344:   static int accept(int fd, struct sockaddr* him, socklen_t* len);
phh@3344:   static int recvfrom(int fd, char* buf, size_t nbytes, uint flags,
phh@3344:                       struct sockaddr* from, socklen_t* fromlen);
phh@3344:   static int get_sock_name(int fd, struct sockaddr* him, socklen_t* len);
phh@3344:   static int sendto(int fd, char* buf, size_t len, uint flags,
phh@3344:                     struct sockaddr* to, socklen_t tolen);
phh@3344:   static int socket_available(int fd, jint* pbytes);
ikrylov@2322: 
ikrylov@2322:   static int get_sock_opt(int fd, int level, int optname,
phh@3344:                           char* optval, socklen_t* optlen);
ikrylov@2322:   static int set_sock_opt(int fd, int level, int optname,
phh@3344:                           const char* optval, socklen_t optlen);
ikrylov@2322:   static int get_host_name(char* name, int namelen);
ikrylov@2322: 
phh@3344:   static struct hostent* get_host_by_name(char* name);
ikrylov@2322: 
duke@435:   // Support for signals (see JVM_RaiseSignal, JVM_RegisterSignal)
duke@435:   static void  signal_init();
duke@435:   static void  signal_init_pd();
duke@435:   static void  signal_notify(int signal_number);
duke@435:   static void* signal(int signal_number, void* handler);
duke@435:   static void  signal_raise(int signal_number);
duke@435:   static int   signal_wait();
duke@435:   static int   signal_lookup();
duke@435:   static void* user_handler();
duke@435:   static void  terminate_signal_thread();
duke@435:   static int   sigexitnum_pd();
duke@435: 
duke@435:   // random number generation
duke@435:   static long random();                    // return 32bit pseudorandom number
duke@435:   static void init_random(long initval);   // initialize random sequence
duke@435: 
duke@435:   // Structured OS Exception support
duke@435:   static void os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* method, JavaCallArguments* args, Thread* thread);
duke@435: 
ctornqvi@2520:   // On Windows this will create an actual minidump, on Linux/Solaris it will simply check core dump limits
ctornqvi@2520:   static void check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize);
ctornqvi@2520: 
mikael@3903:   // Get the default path to the core file
mikael@3903:   // Returns the length of the string
mikael@3903:   static int get_core_path(char* buffer, size_t bufferSize);
mikael@3903: 
duke@435:   // JVMTI & JVM monitoring and management support
duke@435:   // The thread_cpu_time() and current_thread_cpu_time() are only
duke@435:   // supported if is_thread_cpu_time_supported() returns true.
duke@435:   // They are not supported on Solaris T1.
duke@435: 
duke@435:   // Thread CPU Time - return the fast estimate on a platform
duke@435:   // On Solaris - call gethrvtime (fast) - user time only
duke@435:   // On Linux   - fast clock_gettime where available - user+sys
duke@435:   //            - otherwise: very slow /proc fs - user+sys
duke@435:   // On Windows - GetThreadTimes - user+sys
duke@435:   static jlong current_thread_cpu_time();
duke@435:   static jlong thread_cpu_time(Thread* t);
duke@435: 
duke@435:   // Thread CPU Time with user_sys_cpu_time parameter.
duke@435:   //
duke@435:   // If user_sys_cpu_time is true, user+sys time is returned.
duke@435:   // Otherwise, only user time is returned
duke@435:   static jlong current_thread_cpu_time(bool user_sys_cpu_time);
duke@435:   static jlong thread_cpu_time(Thread* t, bool user_sys_cpu_time);
duke@435: 
duke@435:   // Return a bunch of info about the timers.
duke@435:   // Note that the returned info for these two functions may be different
duke@435:   // on some platforms
duke@435:   static void current_thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
duke@435:   static void thread_cpu_time_info(jvmtiTimerInfo *info_ptr);
duke@435: 
duke@435:   static bool is_thread_cpu_time_supported();
duke@435: 
duke@435:   // System loadavg support.  Returns -1 if load average cannot be obtained.
duke@435:   static int loadavg(double loadavg[], int nelem);
duke@435: 
duke@435:   // Hook for os specific jvm options that we don't want to abort on seeing
duke@435:   static bool obsolete_option(const JavaVMOption *option);
duke@435: 
phh@3378:   // Extensions
phh@3378: #include "runtime/os_ext.hpp"
phh@3378: 
phh@3378:  public:
rbackman@5424:   class CrashProtectionCallback : public StackObj {
rbackman@5424:   public:
rbackman@5424:     virtual void call() = 0;
rbackman@5424:   };
phh@3378: 
duke@435:   // Platform dependent stuff
stefank@2314: #ifdef TARGET_OS_FAMILY_linux
stefank@2314: # include "os_linux.hpp"
nloodin@3783: # include "os_posix.hpp"
stefank@2314: #endif
stefank@2314: #ifdef TARGET_OS_FAMILY_solaris
stefank@2314: # include "os_solaris.hpp"
nloodin@3783: # include "os_posix.hpp"
stefank@2314: #endif
stefank@2314: #ifdef TARGET_OS_FAMILY_windows
stefank@2314: # include "os_windows.hpp"
stefank@2314: #endif
goetz@6461: #ifdef TARGET_OS_FAMILY_aix
goetz@6461: # include "os_aix.hpp"
goetz@6461: # include "os_posix.hpp"
goetz@6461: #endif
never@3156: #ifdef TARGET_OS_FAMILY_bsd
nloodin@3783: # include "os_posix.hpp"
never@3156: # include "os_bsd.hpp"
never@3156: #endif
stefank@2314: #ifdef TARGET_OS_ARCH_linux_x86
stefank@2314: # include "os_linux_x86.hpp"
stefank@2314: #endif
stefank@2314: #ifdef TARGET_OS_ARCH_linux_sparc
stefank@2314: # include "os_linux_sparc.hpp"
stefank@2314: #endif
stefank@2314: #ifdef TARGET_OS_ARCH_linux_zero
stefank@2314: # include "os_linux_zero.hpp"
stefank@2314: #endif
stefank@2314: #ifdef TARGET_OS_ARCH_solaris_x86
stefank@2314: # include "os_solaris_x86.hpp"
stefank@2314: #endif
stefank@2314: #ifdef TARGET_OS_ARCH_solaris_sparc
stefank@2314: # include "os_solaris_sparc.hpp"
stefank@2314: #endif
stefank@2314: #ifdef TARGET_OS_ARCH_windows_x86
stefank@2314: # include "os_windows_x86.hpp"
stefank@2314: #endif
bobv@2508: #ifdef TARGET_OS_ARCH_linux_arm
bobv@2508: # include "os_linux_arm.hpp"
bobv@2508: #endif
bobv@2508: #ifdef TARGET_OS_ARCH_linux_ppc
bobv@2508: # include "os_linux_ppc.hpp"
bobv@2508: #endif
goetz@6461: #ifdef TARGET_OS_ARCH_aix_ppc
goetz@6461: # include "os_aix_ppc.hpp"
goetz@6461: #endif
never@3156: #ifdef TARGET_OS_ARCH_bsd_x86
never@3156: # include "os_bsd_x86.hpp"
never@3156: #endif
never@3156: #ifdef TARGET_OS_ARCH_bsd_zero
never@3156: # include "os_bsd_zero.hpp"
never@3156: #endif
stefank@2314: 
phh@3378:  public:
iklam@5667: #ifndef PLATFORM_PRINT_NATIVE_STACK
iklam@5667:   // No platform-specific code for printing the native stack.
iklam@5667:   static bool platform_print_native_stack(outputStream* st, void* context,
iklam@5667:                                           char *buf, int buf_size) {
iklam@5667:     return false;
iklam@5667:   }
iklam@5667: #endif
iklam@5667: 
bobv@2036:   // debugging support (mostly used by debug.cpp but also fatal error handler)
bobv@2036:   static bool find(address pc, outputStream* st = tty); // OS specific function to make sense out of an address
duke@435: 
duke@435:   static bool dont_yield();                     // when true, JVM_Yield() is nop
duke@435:   static void print_statistics();
duke@435: 
duke@435:   // Thread priority helpers (implemented in OS-specific part)
duke@435:   static OSReturn set_native_priority(Thread* thread, int native_prio);
duke@435:   static OSReturn get_native_priority(const Thread* const thread, int* priority_ptr);
phh@3481:   static int java_to_os_priority[CriticalPriority + 1];
duke@435:   // Hint to the underlying OS that a task switch would not be good.
duke@435:   // Void return because it's a hint and can fail.
duke@435:   static void hint_no_preempt();
duke@435: 
duke@435:   // Used at creation if requested by the diagnostic flag PauseAtStartup.
duke@435:   // Causes the VM to wait until an external stimulus has been applied
duke@435:   // (for Unix, that stimulus is a signal, for Windows, an external
duke@435:   // ResumeThread call)
duke@435:   static void pause();
duke@435: 
bpittore@5585:   // Builds a platform dependent Agent_OnLoad_<libname> function name
bpittore@5585:   // which is used to find statically linked in agents.
bpittore@5585:   static char*  build_agent_function_name(const char *sym, const char *cname,
bpittore@5585:                                           bool is_absolute_path);
bpittore@5585: 
sla@5237:   class SuspendedThreadTaskContext {
sla@5237:   public:
sla@5237:     SuspendedThreadTaskContext(Thread* thread, void *ucontext) : _thread(thread), _ucontext(ucontext) {}
sla@5237:     Thread* thread() const { return _thread; }
sla@5237:     void* ucontext() const { return _ucontext; }
sla@5237:   private:
sla@5237:     Thread* _thread;
sla@5237:     void* _ucontext;
sla@5237:   };
sla@5237: 
sla@5237:   class SuspendedThreadTask {
sla@5237:   public:
sla@5237:     SuspendedThreadTask(Thread* thread) : _thread(thread), _done(false) {}
sla@5237:     virtual ~SuspendedThreadTask() {}
sla@5237:     void run();
sla@5237:     bool is_done() { return _done; }
sla@5237:     virtual void do_task(const SuspendedThreadTaskContext& context) = 0;
sla@5237:   protected:
sla@5237:   private:
sla@5237:     void internal_do_task();
sla@5237:     Thread* _thread;
sla@5237:     bool _done;
sla@5237:   };
sla@5237: 
sla@5237: #ifndef TARGET_OS_FAMILY_windows
sla@5237:   // Suspend/resume support
sla@5237:   // Protocol:
sla@5237:   //
sla@5237:   // a thread starts in SR_RUNNING
sla@5237:   //
sla@5237:   // SR_RUNNING can go to
sla@5237:   //   * SR_SUSPEND_REQUEST when the WatcherThread wants to suspend it
sla@5237:   // SR_SUSPEND_REQUEST can go to
sla@5237:   //   * SR_RUNNING if WatcherThread decides it waited for SR_SUSPENDED too long (timeout)
sla@5237:   //   * SR_SUSPENDED if the stopped thread receives the signal and switches state
sla@5237:   // SR_SUSPENDED can go to
sla@5237:   //   * SR_WAKEUP_REQUEST when the WatcherThread has done the work and wants to resume
sla@5237:   // SR_WAKEUP_REQUEST can go to
sla@5237:   //   * SR_RUNNING when the stopped thread receives the signal
sla@5237:   //   * SR_WAKEUP_REQUEST on timeout (resend the signal and try again)
sla@5237:   class SuspendResume {
sla@5237:    public:
sla@5237:     enum State {
sla@5237:       SR_RUNNING,
sla@5237:       SR_SUSPEND_REQUEST,
sla@5237:       SR_SUSPENDED,
sla@5237:       SR_WAKEUP_REQUEST
sla@5237:     };
sla@5237: 
sla@5237:   private:
sla@5237:     volatile State _state;
sla@5237: 
sla@5237:   private:
sla@5237:     /* try to switch state from state "from" to state "to"
sla@5237:      * returns the state set after the method is complete
sla@5237:      */
sla@5237:     State switch_state(State from, State to);
sla@5237: 
sla@5237:   public:
sla@5237:     SuspendResume() : _state(SR_RUNNING) { }
sla@5237: 
sla@5237:     State state() const { return _state; }
sla@5237: 
sla@5237:     State request_suspend() {
sla@5237:       return switch_state(SR_RUNNING, SR_SUSPEND_REQUEST);
sla@5237:     }
sla@5237: 
sla@5237:     State cancel_suspend() {
sla@5237:       return switch_state(SR_SUSPEND_REQUEST, SR_RUNNING);
sla@5237:     }
sla@5237: 
sla@5237:     State suspended() {
sla@5237:       return switch_state(SR_SUSPEND_REQUEST, SR_SUSPENDED);
sla@5237:     }
sla@5237: 
sla@5237:     State request_wakeup() {
sla@5237:       return switch_state(SR_SUSPENDED, SR_WAKEUP_REQUEST);
sla@5237:     }
sla@5237: 
sla@5237:     State running() {
sla@5237:       return switch_state(SR_WAKEUP_REQUEST, SR_RUNNING);
sla@5237:     }
sla@5237: 
sla@5237:     bool is_running() const {
sla@5237:       return _state == SR_RUNNING;
sla@5237:     }
sla@5237: 
sla@5237:     bool is_suspend_request() const {
sla@5237:       return _state == SR_SUSPEND_REQUEST;
sla@5237:     }
sla@5237: 
sla@5237:     bool is_suspended() const {
sla@5237:       return _state == SR_SUSPENDED;
sla@5237:     }
sla@5237:   };
sla@5237: #endif
sla@5237: 
sla@5237: 
duke@435:  protected:
duke@435:   static long _rand_seed;                   // seed for random number generator
duke@435:   static int _processor_count;              // number of processors
duke@435: 
duke@435:   static char* format_boot_path(const char* format_string,
duke@435:                                 const char* home,
duke@435:                                 int home_len,
duke@435:                                 char fileSep,
duke@435:                                 char pathSep);
duke@435:   static bool set_boot_path(char fileSep, char pathSep);
phh@1126:   static char** split_path(const char* path, int* n);
rbackman@5424: 
duke@435: };
duke@435: 
duke@435: // Note that "PAUSE" is almost always used with synchronization
duke@435: // so arguably we should provide Atomic::SpinPause() instead
duke@435: // of the global SpinPause() with C linkage.
duke@435: // It'd also be eligible for inlining on many platforms.
duke@435: 
goetz@5400: extern "C" int SpinPause();
stefank@2314: 
stefank@2314: #endif // SHARE_VM_RUNTIME_OS_HPP