/*

 * Copyright (c) 1999, 2014, 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_BSD_VM_OS_BSD_HPP

#define OS_BSD_VM_OS_BSD_HPP

// Bsd_OS defines the interface to Bsd operating systems

// Information about the protection of the page at address '0' on this os.

static bool zero_page_read_protected() { return true; }

// pthread_getattr_np comes with BsdThreads-0.9-7 on RedHat 7.1

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

#ifdef __APPLE__

// Mac OS X doesn't support clock_gettime. Stub out the type, it is

// unused

typedef int clockid_t;

#endif

class Bsd {

  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];

#ifdef __APPLE__

  // mach_absolute_time

  static mach_timebase_info_data_t _timebase_info;

  static volatile uint64_t         _max_abstime;

#else

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

#endif

  static GrowableArray<int>* _cpu_to_node;

 protected:

  static julong _physical_memory;

  static pthread_t _main_thread;

  static int _page_size;

  static julong available_memory();

  static julong physical_memory() { return _physical_memory; }

  static void initialize_system_info();

  static bool supports_variable_stack_size();

  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);

 public:

  static void init_thread_fpu_state();

  static pthread_t main_thread(void)                                { return _main_thread; }

  static void hotspot_sigmask(Thread* thread);

  static bool is_initial_thread(void);

  static pid_t gettid();

  static int page_size(void)                                        { return _page_size; }

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

  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_bsd_i486.hpp, but

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

  // Bsd 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_bsd_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);

  // 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);

  // Real-time clock functions

  static void clock_init(void);

  // Stack repair handling

  // none present

  // BsdThreads work-around for 6292965

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

 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; }

 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  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_BSD_VM_OS_BSD_HPP