#ifndef OS_LINUX_VM_OS_LINUX_HPP

#define OS_LINUX_VM_OS_LINUX_HPP

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 int commit_memory_impl(char* addr, size_t bytes, bool exec);

static int commit_memory_impl(char* addr, size_t bytes,

size_t alignment_hint, bool exec);

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);

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