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 /*

  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #ifndef OS_LINUX_VM_OS_LINUX_HPP

 #define OS_LINUX_VM_OS_LINUX_HPP

 // Linux_OS defines the interface to Linux operating systems

 /* pthread_getattr_np comes with LinuxThreads-0.9-7 on RedHat 7.1 */

 typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);

 class Linux {

   friend class os;

   // For signal-chaining

 #define MAXSIGNUM 32

   static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions

   static unsigned int sigs;             // mask of signals that have

                                         // preinstalled signal handlers

   static bool libjsig_is_loaded;        // libjsig that interposes sigaction(),

                                         // __sigaction(), signal() is loaded

   static struct sigaction *(*get_signal_action)(int);

   static struct sigaction *get_preinstalled_handler(int);

   static void save_preinstalled_handler(int, struct sigaction&);

   static void check_signal_handler(int sig);

   // For signal flags diagnostics

   static int sigflags[MAXSIGNUM];

   static int (*_clock_gettime)(clockid_t, struct timespec *);

   static int (*_pthread_getcpuclockid)(pthread_t, clockid_t *);

   static address   _initial_thread_stack_bottom;

   static uintptr_t _initial_thread_stack_size;

   static const char *_glibc_version;

   static const char *_libpthread_version;

   static bool _is_floating_stack;

   static bool _is_NPTL;

   static bool _supports_fast_thread_cpu_time;

   static GrowableArray<int>* _cpu_to_node;

  protected:

   static julong _physical_memory;

   static pthread_t _main_thread;

   static Mutex* _createThread_lock;

   static int _page_size;

   static const int _vm_default_page_size;

   static julong available_memory();

   static julong physical_memory() { return _physical_memory; }

   static void initialize_system_info();

   static void set_glibc_version(const char *s)      { _glibc_version = s; }

   static void set_libpthread_version(const char *s) { _libpthread_version = s; }

   static bool supports_variable_stack_size();

   static void set_is_NPTL()                   { _is_NPTL = true;  }

   static void set_is_LinuxThreads()           { _is_NPTL = false; }

   static void set_is_floating_stack()         { _is_floating_stack = true; }

   static void rebuild_cpu_to_node_map();

   static GrowableArray<int>* cpu_to_node()    { return _cpu_to_node; }

   static bool hugetlbfs_sanity_check(bool warn, size_t page_size);

   static void print_full_memory_info(outputStream* st);

   static void print_distro_info(outputStream* st);

   static void print_libversion_info(outputStream* st);

  public:

   static bool _stack_is_executable;

   static void *dlopen_helper(const char *name, char *ebuf, int ebuflen);

   static void *dll_load_in_vmthread(const char *name, char *ebuf, int ebuflen);

   static void init_thread_fpu_state();

   static int  get_fpu_control_word();

   static void set_fpu_control_word(int fpu_control);

   static pthread_t main_thread(void)                                { return _main_thread; }

   // returns kernel thread id (similar to LWP id on Solaris), which can be

   // used to access /proc

   static pid_t gettid();

   static void set_createThread_lock(Mutex* lk)                      { _createThread_lock = lk; }

   static Mutex* createThread_lock(void)                             { return _createThread_lock; }

   static void hotspot_sigmask(Thread* thread);

   static address   initial_thread_stack_bottom(void)                { return _initial_thread_stack_bottom; }

   static uintptr_t initial_thread_stack_size(void)                  { return _initial_thread_stack_size; }

   static bool is_initial_thread(void);

   static int page_size(void)                                        { return _page_size; }

   static void set_page_size(int val)                                { _page_size = val; }

   static int vm_default_page_size(void)                             { return _vm_default_page_size; }

   static address   ucontext_get_pc(ucontext_t* uc);

   static intptr_t* ucontext_get_sp(ucontext_t* uc);

   static intptr_t* ucontext_get_fp(ucontext_t* uc);

   // For Analyzer Forte AsyncGetCallTrace profiling support:

   //

   // This interface should be declared in os_linux_i486.hpp, but

   // that file provides extensions to the os class and not the

   // Linux class.

   static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,

     intptr_t** ret_sp, intptr_t** ret_fp);

   // This boolean allows users to forward their own non-matching signals

   // to JVM_handle_linux_signal, harmlessly.

   static bool signal_handlers_are_installed;

   static int get_our_sigflags(int);

   static void set_our_sigflags(int, int);

   static void signal_sets_init();

   static void install_signal_handlers();

   static void set_signal_handler(int, bool);

   static bool is_sig_ignored(int sig);

   static sigset_t* unblocked_signals();

   static sigset_t* vm_signals();

   static sigset_t* allowdebug_blocked_signals();

   // For signal-chaining

   static struct sigaction *get_chained_signal_action(int sig);

   static bool chained_handler(int sig, siginfo_t* siginfo, void* context);

   // GNU libc and libpthread version strings

   static const char *glibc_version()          { return _glibc_version; }

   static const char *libpthread_version()     { return _libpthread_version; }

   // NPTL or LinuxThreads?

   static bool is_LinuxThreads()               { return !_is_NPTL; }

   static bool is_NPTL()                       { return _is_NPTL;  }

   // NPTL is always floating stack. LinuxThreads could be using floating

   // stack or fixed stack.

   static bool is_floating_stack()             { return _is_floating_stack; }

   static void libpthread_init();

   static bool libnuma_init();

   static void* libnuma_dlsym(void* handle, const char* name);

   // Minimum stack size a thread can be created with (allowing

   // the VM to completely create the thread and enter user code)

   static size_t min_stack_allowed;

   // Return default stack size or guard size for the specified thread type

   static size_t default_stack_size(os::ThreadType thr_type);

   static size_t default_guard_size(os::ThreadType thr_type);

   static void capture_initial_stack(size_t max_size);

   // Stack overflow handling

   static bool manually_expand_stack(JavaThread * t, address addr);

   static int max_register_window_saves_before_flushing();

   // Real-time clock functions

   static void clock_init(void);

   // fast POSIX clocks support

   static void fast_thread_clock_init(void);

   static inline bool supports_monotonic_clock() {

     return _clock_gettime != NULL;

   }

   static int clock_gettime(clockid_t clock_id, struct timespec *tp) {

     return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;

   }

   static int pthread_getcpuclockid(pthread_t tid, clockid_t *clock_id) {

     return _pthread_getcpuclockid ? _pthread_getcpuclockid(tid, clock_id) : -1;

   }

   static bool supports_fast_thread_cpu_time() {

     return _supports_fast_thread_cpu_time;

   }

   static jlong fast_thread_cpu_time(clockid_t clockid);

   // Stack repair handling

   // none present

   // LinuxThreads work-around for 6292965

   static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);

   // Linux suspend/resume support - this helper is a shadow of its former

   // self now that low-level suspension is barely used, and old workarounds

   // for LinuxThreads are no longer needed.

   class SuspendResume {

   private:

     volatile int  _suspend_action;

     volatile jint _state;

   public:

     // values for suspend_action:

     enum {

       SR_NONE              = 0x00,

       SR_SUSPEND           = 0x01,  // suspend request

       SR_CONTINUE          = 0x02,  // resume request

       SR_SUSPENDED         = 0x20   // values for _state: + SR_NONE

     };

     SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; }

     int suspend_action() const     { return _suspend_action; }

     void set_suspend_action(int x) { _suspend_action = x;    }

     // atomic updates for _state

     inline void set_suspended();

     inline void clear_suspended();

     bool is_suspended()            { return _state & SR_SUSPENDED;       }

   };

 private:

   typedef int (*sched_getcpu_func_t)(void);

   typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);

   typedef int (*numa_max_node_func_t)(void);

   typedef int (*numa_available_func_t)(void);

   typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);

   typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);

   static sched_getcpu_func_t _sched_getcpu;

   static numa_node_to_cpus_func_t _numa_node_to_cpus;

   static numa_max_node_func_t _numa_max_node;

   static numa_available_func_t _numa_available;

   static numa_tonode_memory_func_t _numa_tonode_memory;

   static numa_interleave_memory_func_t _numa_interleave_memory;

   static unsigned long* _numa_all_nodes;

   static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }

   static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }

   static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }

   static void set_numa_available(numa_available_func_t func) { _numa_available = func; }

   static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }

   static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }

   static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }

   static int sched_getcpu_syscall(void);

 public:

   static int sched_getcpu()  { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }

   static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {

     return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;

   }

   static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }

   static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }

   static int numa_tonode_memory(void *start, size_t size, int node) {

     return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;

   }

   static void numa_interleave_memory(void *start, size_t size) {

     if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {

       _numa_interleave_memory(start, size, _numa_all_nodes);

     }

   }

   static int get_node_by_cpu(int cpu_id);

 };

 class PlatformEvent : public CHeapObj<mtInternal> {

   private:

     double CachePad [4] ;   // increase odds that _mutex is sole occupant of cache line

     volatile int _Event ;

     volatile int _nParked ;

     pthread_mutex_t _mutex  [1] ;

     pthread_cond_t  _cond   [1] ;

     double PostPad  [2] ;

     Thread * _Assoc ;

   public:       // TODO-FIXME: make dtor private

     ~PlatformEvent() { guarantee (0, "invariant") ; }

   public:

     PlatformEvent() {

       int status;

       status = pthread_cond_init (_cond, NULL);

       assert_status(status == 0, status, "cond_init");

       status = pthread_mutex_init (_mutex, NULL);

       assert_status(status == 0, status, "mutex_init");

       _Event   = 0 ;

       _nParked = 0 ;

       _Assoc   = NULL ;

     }

     // Use caution with reset() and fired() -- they may require MEMBARs

     void reset() { _Event = 0 ; }

     int  fired() { return _Event; }

     void park () ;

     void unpark () ;

     int  TryPark () ;

     int  park (jlong millis) ;

     void SetAssociation (Thread * a) { _Assoc = a ; }

 } ;

 class PlatformParker : public CHeapObj<mtInternal> {

   protected:

     pthread_mutex_t _mutex [1] ;

     pthread_cond_t  _cond  [1] ;

   public:       // TODO-FIXME: make dtor private

     ~PlatformParker() { guarantee (0, "invariant") ; }

   public:

     PlatformParker() {

       int status;

       status = pthread_cond_init (_cond, NULL);

       assert_status(status == 0, status, "cond_init");

       status = pthread_mutex_init (_mutex, NULL);

       assert_status(status == 0, status, "mutex_init");

     }

 } ;

 #endif // OS_LINUX_VM_OS_LINUX_HPP