/** * Initializes Java monitor. * * Monitor is a recursive lock with one conditional variable associated with it. * Implementation may use the knowledge of internal object layout in order to allocate lock * and conditional variable in the most efficient manner. * * @param[in] monitor object where monitor needs to be initialized. */ IDATA VMCALL jthread_monitor_init(jobject monitor) { assert(monitor); hythread_suspend_disable(); hythread_thin_monitor_t *lockword = vm_object_get_lockword_addr(monitor); IDATA status = hythread_thin_monitor_create(lockword); hythread_suspend_enable(); return status; } // jthread_monitor_init
/** * Completely releases the ownership over monitor. * * @param[in] monitor monitor */ IDATA VMCALL jthread_monitor_release(jobject monitor) { assert(monitor); hythread_suspend_disable(); hythread_thin_monitor_t *lockword = vm_object_get_lockword_addr(monitor); IDATA status = hythread_thin_monitor_release(lockword); assert(status == TM_ERROR_NONE); hythread_suspend_enable(); return TM_ERROR_NONE; } // jthread_monitor_release
/** * Attempt to gain the ownership over monitor without blocking. * * @param[in] monitor object where monitor is located */ IDATA VMCALL jthread_monitor_try_enter(jobject monitor) { assert(monitor); hythread_suspend_disable(); hythread_thin_monitor_t *lockword = vm_object_get_lockword_addr(monitor); IDATA status = hythread_thin_monitor_try_enter(lockword); hythread_suspend_enable(); if (status == TM_ERROR_NONE && ti_is_enabled()) { jthread_add_owned_monitor(monitor); } return status; } // jthread_monitor_try_enter
/** * Releases the ownership over monitor. * * @param[in] monitor monitor * @sa JNI::MonitorExit() */ IDATA VMCALL jthread_monitor_exit(jobject monitor) { assert(monitor); hythread_suspend_disable(); hythread_thin_monitor_t *lockword = vm_object_get_lockword_addr(monitor); IDATA status = hythread_thin_monitor_exit(lockword); hythread_suspend_enable(); if (status == TM_ERROR_NONE && ti_is_enabled()) { jthread_remove_owned_monitor(monitor); } if (status == TM_ERROR_ILLEGAL_STATE) { jthread_throw_exception("java/lang/IllegalMonitorStateException", "Illegal monitor state"); } return status; } // jthread_monitor_exit
/** * Returns the number of times given thread have entered given monitor; * * If the given monitor is not owned by this thread, 0 is returned. * * @param[in] monitor monitor those owner needs to be determined * @param[in] owner thread which owns the monitor */ IDATA VMCALL jthread_get_lock_recursion(jobject monitor, jthread owner) { assert(monitor); hythread_t given_thread = owner ? jthread_get_native_thread(owner) : NULL; hythread_suspend_disable(); hythread_thin_monitor_t *lockword = vm_object_get_lockword_addr(monitor); hythread_t lock_owner = hythread_thin_monitor_get_owner(lockword); IDATA recursion = 0; if (lock_owner && (!given_thread || hythread_get_id(lock_owner) == hythread_get_id(given_thread))) { recursion = hythread_thin_monitor_get_recursion(lockword); } hythread_suspend_enable(); return recursion; } // jthread_get_lock_recursion
/** * Returns the owner of the lock associated with the given monitor. * * If the given monitor is not owned by any thread, NULL is returned. * * @param[in] monitor monitor those owner needs to be determined * @param[out] lock_owner thread which owns the monitor */ IDATA VMCALL jthread_get_lock_owner(jobject monitor, jthread * lock_owner) { assert(monitor); assert(lock_owner); *lock_owner = NULL; IDATA status = TM_ERROR_NONE; hythread_suspend_disable(); hythread_thin_monitor_t *lockword = vm_object_get_lockword_addr(monitor); hythread_t native_thread = hythread_thin_monitor_get_owner(lockword); if (native_thread) { vm_thread_t vm_thread = jthread_get_vm_thread(native_thread); if (vm_thread) { *lock_owner = vm_thread->java_thread; } else { status = TM_ERROR_ILLEGAL_STATE; } } hythread_suspend_enable(); return status; } // jthread_get_lock_owner
/** * Gains the ownership over monitor. * * Current thread blocks if the specified monitor is owned by other thread. * * @param[in] monitor object where monitor is located * @sa JNI::MonitorEnter() */ IDATA VMCALL jthread_monitor_enter(jobject monitor) { IDATA state; hythread_t native_thread; apr_time_t enter_begin; assert(monitor); hythread_suspend_disable(); hythread_thin_monitor_t *lockword = vm_object_get_lockword_addr(monitor); IDATA status = hythread_thin_monitor_try_enter(lockword); if (status != TM_ERROR_EBUSY) { goto entered; } #ifdef LOCK_RESERVATION // busy unreserve lock before blocking and inflating while (TM_ERROR_NONE != hythread_unreserve_lock(lockword)) { hythread_yield(); hythread_safe_point(); hythread_exception_safe_point(); lockword = vm_object_get_lockword_addr(monitor); } status = hythread_thin_monitor_try_enter(lockword); if (status != TM_ERROR_EBUSY) { goto entered; } #endif //LOCK_RESERVATION native_thread = hythread_self(); hythread_thread_lock(native_thread); state = hythread_get_state(native_thread); state &= ~TM_THREAD_STATE_RUNNABLE; state |= TM_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER; status = hythread_set_state(native_thread, state); assert(status == TM_ERROR_NONE); hythread_thread_unlock(native_thread); // should be moved to event handler if (ti_is_enabled()) { enter_begin = apr_time_now(); int disable_count = hythread_reset_suspend_disable(); jthread_set_owned_monitor(monitor); if(jvmti_should_report_event(JVMTI_EVENT_MONITOR_CONTENDED_ENTER)) { jvmti_send_contended_enter_or_entered_monitor_event(monitor, 1); } hythread_set_suspend_disable(disable_count); } // busy wait and inflate // reload pointer after safepoints lockword = vm_object_get_lockword_addr(monitor); while ((status = hythread_thin_monitor_try_enter(lockword)) == TM_ERROR_EBUSY) { hythread_safe_point(); hythread_exception_safe_point(); lockword = vm_object_get_lockword_addr(monitor); if (hythread_is_fat_lock(*lockword)) { status = hythread_thin_monitor_enter(lockword); if (status != TM_ERROR_NONE) { hythread_suspend_enable(); assert(0); return status; } goto contended_entered; } hythread_yield(); } assert(status == TM_ERROR_NONE); if (!hythread_is_fat_lock(*lockword)) { hythread_inflate_lock(lockword); } // do all ti staff here contended_entered: if (ti_is_enabled()) { int disable_count = hythread_reset_suspend_disable(); if(jvmti_should_report_event(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED)) { jvmti_send_contended_enter_or_entered_monitor_event(monitor, 0); } hythread_set_suspend_disable(disable_count); // should be moved to event handler jvmti_thread_t jvmti_thread = jthread_get_jvmti_thread(hythread_self()); jvmti_thread->blocked_time += apr_time_now() - enter_begin; } hythread_thread_lock(native_thread); state = hythread_get_state(native_thread); state &= ~TM_THREAD_STATE_BLOCKED_ON_MONITOR_ENTER; state |= TM_THREAD_STATE_RUNNABLE; status = hythread_set_state(native_thread, state); assert(status == TM_ERROR_NONE); hythread_thread_unlock(native_thread); entered: if (ti_is_enabled()) { jthread_add_owned_monitor(monitor); } hythread_suspend_enable(); return TM_ERROR_NONE; } // jthread_monitor_enter
/** * Wait on the <code>object</code>'s monitor with the specified timeout. * * This function instructs the current thread to be scheduled off * the processor and wait on the monitor until the following occurs: * <UL> * <LI>another thread invokes <code>thread_notify(object)</code> * and VM chooses this thread to wake up; * <LI>another thread invokes <code>thread_notifyAll(object);</code> * <LI>another thread invokes <code>thread_interrupt(thread);</code> * <LI>real time elapsed from the waiting begin is * greater or equal the timeout specified. * </UL> * * @param[in] monitor object where monitor is located * @param[in] millis time to wait (in milliseconds) * @param[in] nanos time to wait (in nanoseconds) * @sa java.lang.Object.wait() */ IDATA VMCALL jthread_monitor_timed_wait(jobject monitor, jlong millis, jint nanos) { assert(monitor); hythread_suspend_disable(); hythread_t native_thread = hythread_self(); hythread_thin_monitor_t *lockword = vm_object_get_lockword_addr(monitor); if (!hythread_is_fat_lock(*lockword)) { if (!hythread_owns_thin_lock(native_thread, *lockword)) { CTRACE(("ILLEGAL_STATE wait %x\n", lockword)); hythread_suspend_enable(); return TM_ERROR_ILLEGAL_STATE; } hythread_inflate_lock(lockword); } apr_time_t wait_begin; if (ti_is_enabled()) { int disable_count = hythread_reset_suspend_disable(); jthread_set_wait_monitor(monitor); jthread_set_owned_monitor(monitor); if(jvmti_should_report_event(JVMTI_EVENT_MONITOR_WAIT)) { jvmti_send_wait_monitor_event(monitor, (jlong) millis); } if(jvmti_should_report_event(JVMTI_EVENT_MONITOR_CONTENDED_ENTER)) { jvmti_send_contended_enter_or_entered_monitor_event(monitor, 1); } hythread_set_suspend_disable(disable_count); // should be moved to event handler wait_begin = apr_time_now(); jthread_remove_owned_monitor(monitor); } hythread_thread_lock(native_thread); IDATA state = hythread_get_state(native_thread); state &= ~TM_THREAD_STATE_RUNNABLE; state |= TM_THREAD_STATE_WAITING | TM_THREAD_STATE_IN_MONITOR_WAIT; if ((millis > 0) || (nanos > 0)) { state |= TM_THREAD_STATE_WAITING_WITH_TIMEOUT; } else { state |= TM_THREAD_STATE_WAITING_INDEFINITELY; } IDATA status = hythread_set_state(native_thread, state); assert(status == TM_ERROR_NONE); hythread_thread_unlock(native_thread); status = hythread_thin_monitor_wait_interruptable(lockword, millis, nanos); hythread_thread_lock(native_thread); state = hythread_get_state(native_thread); if ((millis > 0) || (nanos > 0)) { state &= ~TM_THREAD_STATE_WAITING_WITH_TIMEOUT; } else { state &= ~TM_THREAD_STATE_WAITING_INDEFINITELY; } state &= ~(TM_THREAD_STATE_WAITING | TM_THREAD_STATE_IN_MONITOR_WAIT); state |= TM_THREAD_STATE_RUNNABLE; hythread_set_state(native_thread, state); hythread_thread_unlock(native_thread); hythread_suspend_enable(); if (ti_is_enabled()) { jthread_add_owned_monitor(monitor); int disable_count = hythread_reset_suspend_disable(); if(jvmti_should_report_event(JVMTI_EVENT_MONITOR_CONTENDED_ENTERED)) { jvmti_send_contended_enter_or_entered_monitor_event(monitor, 0); } if(jvmti_should_report_event(JVMTI_EVENT_MONITOR_WAITED)) { jvmti_send_waited_monitor_event(monitor, ((status == APR_TIMEUP) ? (jboolean) 1 : (jboolean) 0)); } hythread_set_suspend_disable(disable_count); // should be moved to event handler jvmti_thread_t jvmti_thread = jthread_get_jvmti_thread(hythread_self()); jvmti_thread->waited_time += apr_time_now() - wait_begin; } return status; } // jthread_monitor_timed_wait