/**
* 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
