never@3156: /*
simonis@4675:  * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
never@3156:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
never@3156:  *
never@3156:  * This code is free software; you can redistribute it and/or modify it
never@3156:  * under the terms of the GNU General Public License version 2 only, as
never@3156:  * published by the Free Software Foundation.
never@3156:  *
never@3156:  * This code is distributed in the hope that it will be useful, but WITHOUT
never@3156:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
never@3156:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
never@3156:  * version 2 for more details (a copy is included in the LICENSE file that
never@3156:  * accompanied this code).
never@3156:  *
never@3156:  * You should have received a copy of the GNU General Public License version
never@3156:  * 2 along with this work; if not, write to the Free Software Foundation,
never@3156:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
never@3156:  *
never@3156:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
never@3156:  * or visit www.oracle.com if you need additional information or have any
never@3156:  * questions.
never@3156:  *
never@3156:  */
never@3156: 
never@3156: #ifndef OS_BSD_VM_OS_BSD_HPP
never@3156: #define OS_BSD_VM_OS_BSD_HPP
never@3156: 
never@3156: // Bsd_OS defines the interface to Bsd operating systems
never@3156: 
never@3156: /* pthread_getattr_np comes with BsdThreads-0.9-7 on RedHat 7.1 */
never@3156: typedef int (*pthread_getattr_func_type) (pthread_t, pthread_attr_t *);
never@3156: 
never@3156: #ifdef __APPLE__
never@3156: // Mac OS X doesn't support clock_gettime. Stub out the type, it is
never@3156: // unused
never@3156: typedef int clockid_t;
never@3156: #endif
never@3156: 
never@3156: class Bsd {
never@3156:   friend class os;
never@3156: 
never@3156:   // For signal-chaining
never@3156: #define MAXSIGNUM 32
never@3156:   static struct sigaction sigact[MAXSIGNUM]; // saved preinstalled sigactions
never@3156:   static unsigned int sigs;             // mask of signals that have
never@3156:                                         // preinstalled signal handlers
never@3156:   static bool libjsig_is_loaded;        // libjsig that interposes sigaction(),
never@3156:                                         // __sigaction(), signal() is loaded
never@3156:   static struct sigaction *(*get_signal_action)(int);
never@3156:   static struct sigaction *get_preinstalled_handler(int);
never@3156:   static void save_preinstalled_handler(int, struct sigaction&);
never@3156: 
never@3156:   static void check_signal_handler(int sig);
never@3156: 
never@3156:   // For signal flags diagnostics
never@3156:   static int sigflags[MAXSIGNUM];
never@3156: 
never@3156:   static int (*_clock_gettime)(clockid_t, struct timespec *);
never@3156: 
never@3156:   static GrowableArray<int>* _cpu_to_node;
never@3156: 
never@3156:  protected:
never@3156: 
never@3156:   static julong _physical_memory;
never@3156:   static pthread_t _main_thread;
never@3156:   static int _page_size;
never@3156: 
never@3156:   static julong available_memory();
never@3156:   static julong physical_memory() { return _physical_memory; }
never@3156:   static void initialize_system_info();
never@3156: 
never@3156:   static bool supports_variable_stack_size();
never@3156: 
never@3156:   static void rebuild_cpu_to_node_map();
never@3156:   static GrowableArray<int>* cpu_to_node()    { return _cpu_to_node; }
never@3156: 
never@3156:   static bool hugetlbfs_sanity_check(bool warn, size_t page_size);
never@3156: 
never@3156:  public:
never@3156: 
never@3156:   static void init_thread_fpu_state();
never@3156:   static pthread_t main_thread(void)                                { return _main_thread; }
never@3156: 
never@3156:   static void hotspot_sigmask(Thread* thread);
never@3156: 
never@3156:   static bool is_initial_thread(void);
never@3156: 
never@3156:   static int page_size(void)                                        { return _page_size; }
never@3156:   static void set_page_size(int val)                                { _page_size = val; }
never@3156: 
never@3156:   static address   ucontext_get_pc(ucontext_t* uc);
never@3156:   static intptr_t* ucontext_get_sp(ucontext_t* uc);
never@3156:   static intptr_t* ucontext_get_fp(ucontext_t* uc);
never@3156: 
never@3156:   // For Analyzer Forte AsyncGetCallTrace profiling support:
never@3156:   //
never@3156:   // This interface should be declared in os_bsd_i486.hpp, but
never@3156:   // that file provides extensions to the os class and not the
never@3156:   // Bsd class.
never@3156:   static ExtendedPC fetch_frame_from_ucontext(Thread* thread, ucontext_t* uc,
never@3156:     intptr_t** ret_sp, intptr_t** ret_fp);
never@3156: 
never@3156:   // This boolean allows users to forward their own non-matching signals
never@3156:   // to JVM_handle_bsd_signal, harmlessly.
never@3156:   static bool signal_handlers_are_installed;
never@3156: 
never@3156:   static int get_our_sigflags(int);
never@3156:   static void set_our_sigflags(int, int);
never@3156:   static void signal_sets_init();
never@3156:   static void install_signal_handlers();
never@3156:   static void set_signal_handler(int, bool);
never@3156:   static bool is_sig_ignored(int sig);
never@3156: 
never@3156:   static sigset_t* unblocked_signals();
never@3156:   static sigset_t* vm_signals();
never@3156:   static sigset_t* allowdebug_blocked_signals();
never@3156: 
never@3156:   // For signal-chaining
never@3156:   static struct sigaction *get_chained_signal_action(int sig);
never@3156:   static bool chained_handler(int sig, siginfo_t* siginfo, void* context);
never@3156: 
never@3156:   // Minimum stack size a thread can be created with (allowing
never@3156:   // the VM to completely create the thread and enter user code)
never@3156:   static size_t min_stack_allowed;
never@3156: 
never@3156:   // Return default stack size or guard size for the specified thread type
never@3156:   static size_t default_stack_size(os::ThreadType thr_type);
never@3156:   static size_t default_guard_size(os::ThreadType thr_type);
never@3156: 
never@3156:   // Real-time clock functions
never@3156:   static void clock_init(void);
never@3156: 
johnc@4017:   static inline bool supports_monotonic_clock() {
never@3156:     return _clock_gettime != NULL;
never@3156:   }
never@3156: 
never@3156:   static int clock_gettime(clockid_t clock_id, struct timespec *tp) {
never@3156:     return _clock_gettime ? _clock_gettime(clock_id, tp) : -1;
never@3156:   }
never@3156: 
never@3156:   // Stack repair handling
never@3156: 
never@3156:   // none present
never@3156: 
never@3156:   // BsdThreads work-around for 6292965
never@3156:   static int safe_cond_timedwait(pthread_cond_t *_cond, pthread_mutex_t *_mutex, const struct timespec *_abstime);
never@3156: 
never@3156: 
never@3156:   // Bsd suspend/resume support - this helper is a shadow of its former
never@3156:   // self now that low-level suspension is barely used, and old workarounds
never@3156:   // for BsdThreads are no longer needed.
never@3156:   class SuspendResume {
never@3156:   private:
simonis@4675:     volatile int  _suspend_action;
simonis@4675:     volatile jint _state;
simonis@4675:   public:
never@3156:     // values for suspend_action:
simonis@4675:     enum {
simonis@4675:       SR_NONE              = 0x00,
simonis@4675:       SR_SUSPEND           = 0x01,  // suspend request
simonis@4675:       SR_CONTINUE          = 0x02,  // resume request
simonis@4675:       SR_SUSPENDED         = 0x20   // values for _state: + SR_NONE
simonis@4675:     };
never@3156: 
never@3156:     SuspendResume() { _suspend_action = SR_NONE; _state = SR_NONE; }
never@3156: 
never@3156:     int suspend_action() const     { return _suspend_action; }
never@3156:     void set_suspend_action(int x) { _suspend_action = x;    }
never@3156: 
never@3156:     // atomic updates for _state
simonis@4675:     inline void set_suspended();
simonis@4675:     inline void clear_suspended();
never@3156:     bool is_suspended()            { return _state & SR_SUSPENDED;       }
never@3156: 
never@3156:     #undef SR_SUSPENDED
never@3156:   };
never@3156: 
never@3156: private:
never@3156:   typedef int (*sched_getcpu_func_t)(void);
never@3156:   typedef int (*numa_node_to_cpus_func_t)(int node, unsigned long *buffer, int bufferlen);
never@3156:   typedef int (*numa_max_node_func_t)(void);
never@3156:   typedef int (*numa_available_func_t)(void);
never@3156:   typedef int (*numa_tonode_memory_func_t)(void *start, size_t size, int node);
never@3156:   typedef void (*numa_interleave_memory_func_t)(void *start, size_t size, unsigned long *nodemask);
never@3156: 
never@3156:   static sched_getcpu_func_t _sched_getcpu;
never@3156:   static numa_node_to_cpus_func_t _numa_node_to_cpus;
never@3156:   static numa_max_node_func_t _numa_max_node;
never@3156:   static numa_available_func_t _numa_available;
never@3156:   static numa_tonode_memory_func_t _numa_tonode_memory;
never@3156:   static numa_interleave_memory_func_t _numa_interleave_memory;
never@3156:   static unsigned long* _numa_all_nodes;
never@3156: 
never@3156:   static void set_sched_getcpu(sched_getcpu_func_t func) { _sched_getcpu = func; }
never@3156:   static void set_numa_node_to_cpus(numa_node_to_cpus_func_t func) { _numa_node_to_cpus = func; }
never@3156:   static void set_numa_max_node(numa_max_node_func_t func) { _numa_max_node = func; }
never@3156:   static void set_numa_available(numa_available_func_t func) { _numa_available = func; }
never@3156:   static void set_numa_tonode_memory(numa_tonode_memory_func_t func) { _numa_tonode_memory = func; }
never@3156:   static void set_numa_interleave_memory(numa_interleave_memory_func_t func) { _numa_interleave_memory = func; }
never@3156:   static void set_numa_all_nodes(unsigned long* ptr) { _numa_all_nodes = ptr; }
never@3156: public:
never@3156:   static int sched_getcpu()  { return _sched_getcpu != NULL ? _sched_getcpu() : -1; }
never@3156:   static int numa_node_to_cpus(int node, unsigned long *buffer, int bufferlen) {
never@3156:     return _numa_node_to_cpus != NULL ? _numa_node_to_cpus(node, buffer, bufferlen) : -1;
never@3156:   }
never@3156:   static int numa_max_node() { return _numa_max_node != NULL ? _numa_max_node() : -1; }
never@3156:   static int numa_available() { return _numa_available != NULL ? _numa_available() : -1; }
never@3156:   static int numa_tonode_memory(void *start, size_t size, int node) {
never@3156:     return _numa_tonode_memory != NULL ? _numa_tonode_memory(start, size, node) : -1;
never@3156:   }
never@3156:   static void numa_interleave_memory(void *start, size_t size) {
never@3156:     if (_numa_interleave_memory != NULL && _numa_all_nodes != NULL) {
never@3156:       _numa_interleave_memory(start, size, _numa_all_nodes);
never@3156:     }
never@3156:   }
never@3156:   static int get_node_by_cpu(int cpu_id);
never@3156: };
never@3156: 
never@3156: 
zgu@3900: class PlatformEvent : public CHeapObj<mtInternal> {
never@3156:   private:
never@3156:     double CachePad [4] ;   // increase odds that _mutex is sole occupant of cache line
never@3156:     volatile int _Event ;
never@3156:     volatile int _nParked ;
never@3156:     pthread_mutex_t _mutex  [1] ;
never@3156:     pthread_cond_t  _cond   [1] ;
never@3156:     double PostPad  [2] ;
never@3156:     Thread * _Assoc ;
never@3156: 
never@3156:   public:       // TODO-FIXME: make dtor private
never@3156:     ~PlatformEvent() { guarantee (0, "invariant") ; }
never@3156: 
never@3156:   public:
never@3156:     PlatformEvent() {
never@3156:       int status;
never@3156:       status = pthread_cond_init (_cond, NULL);
never@3156:       assert_status(status == 0, status, "cond_init");
never@3156:       status = pthread_mutex_init (_mutex, NULL);
never@3156:       assert_status(status == 0, status, "mutex_init");
never@3156:       _Event   = 0 ;
never@3156:       _nParked = 0 ;
never@3156:       _Assoc   = NULL ;
never@3156:     }
never@3156: 
never@3156:     // Use caution with reset() and fired() -- they may require MEMBARs
never@3156:     void reset() { _Event = 0 ; }
never@3156:     int  fired() { return _Event; }
never@3156:     void park () ;
never@3156:     void unpark () ;
never@3156:     int  TryPark () ;
never@3156:     int  park (jlong millis) ;
never@3156:     void SetAssociation (Thread * a) { _Assoc = a ; }
never@3156: } ;
never@3156: 
zgu@3900: class PlatformParker : public CHeapObj<mtInternal> {
never@3156:   protected:
never@3156:     pthread_mutex_t _mutex [1] ;
never@3156:     pthread_cond_t  _cond  [1] ;
never@3156: 
never@3156:   public:       // TODO-FIXME: make dtor private
never@3156:     ~PlatformParker() { guarantee (0, "invariant") ; }
never@3156: 
never@3156:   public:
never@3156:     PlatformParker() {
never@3156:       int status;
never@3156:       status = pthread_cond_init (_cond, NULL);
never@3156:       assert_status(status == 0, status, "cond_init");
never@3156:       status = pthread_mutex_init (_mutex, NULL);
never@3156:       assert_status(status == 0, status, "mutex_init");
never@3156:     }
never@3156: } ;
never@3156: 
never@3156: #endif // OS_BSD_VM_OS_BSD_HPP