Mercurial > hg > truffle
diff src/os/linux/vm/os_linux.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | fcbfc50865ab |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/os/linux/vm/os_linux.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,286 @@ +/* + * Copyright 1999-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, + * CA 95054 USA or visit www.sun.com if you need additional information or + * have any questions. + * + */ + +// 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 char *_glibc_version; + static char *_libpthread_version; + + static bool _is_floating_stack; + static bool _is_NPTL; + static bool _supports_fast_thread_cpu_time; + + protected: + + static julong _physical_memory; + static pthread_t _main_thread; + static Mutex* _createThread_lock; + static int _page_size; + + static julong available_memory(); + static julong physical_memory() { return _physical_memory; } + static void initialize_system_info(); + + static void set_glibc_version(char *s) { _glibc_version = s; } + static void set_libpthread_version(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; } + + public: + + 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 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 char *glibc_version() { return _glibc_version; } + static 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(); + + // 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 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; + // values for suspend_action: + #define SR_NONE (0x00) + #define SR_SUSPEND (0x01) // suspend request + #define SR_CONTINUE (0x02) // resume request + + volatile jint _state; + // values for _state: + SR_NONE + #define SR_SUSPENDED (0x20) + public: + 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 + void set_suspended() { + jint temp, temp2; + do { + temp = _state; + temp2 = Atomic::cmpxchg(temp | SR_SUSPENDED, &_state, temp); + } while (temp2 != temp); + } + void clear_suspended() { + jint temp, temp2; + do { + temp = _state; + temp2 = Atomic::cmpxchg(temp & ~SR_SUSPENDED, &_state, temp); + } while (temp2 != temp); + } + bool is_suspended() { return _state & SR_SUSPENDED; } + + #undef SR_SUSPENDED + }; +}; + + +class PlatformEvent : public CHeapObj { + 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 { + 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"); + } +} ;