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405 lines
9.6 KiB
C++
405 lines
9.6 KiB
C++
// natThread.cc - Native part of Thread class.
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/* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#include <config.h>
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#include <stdlib.h>
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#include <gcj/cni.h>
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#include <jvm.h>
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#include <java-threads.h>
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#include <java/lang/Thread.h>
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#include <java/lang/ThreadGroup.h>
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#include <java/lang/IllegalArgumentException.h>
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#include <java/lang/UnsupportedOperationException.h>
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#include <java/lang/IllegalThreadStateException.h>
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#include <java/lang/InterruptedException.h>
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#include <java/lang/NullPointerException.h>
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#include <jni.h>
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#ifdef ENABLE_JVMPI
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#include <jvmpi.h>
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#endif
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// This structure is used to represent all the data the native side
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// needs. An object of this type is assigned to the `data' member of
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// the Thread class.
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struct natThread
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{
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// These are used to interrupt sleep and join calls. We can share a
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// condition variable here since it only ever gets notified when the thread
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// exits.
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_Jv_Mutex_t join_mutex;
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_Jv_ConditionVariable_t join_cond;
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// This is private data for the thread system layer.
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_Jv_Thread_t *thread;
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// Each thread has its own JNI object.
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JNIEnv *jni_env;
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};
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static void finalize_native (jobject ptr);
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// This is called from the constructor to initialize the native side
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// of the Thread.
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void
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java::lang::Thread::initialize_native (void)
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{
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natThread *nt = (natThread *) _Jv_AllocBytes (sizeof (natThread));
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// The native thread data is kept in a Object field, not a RawData, so that
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// the GC allocator can be used and a finalizer run after the thread becomes
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// unreachable. Note that this relies on the GC's ability to finalize
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// non-Java objects. FIXME?
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data = reinterpret_cast<jobject> (nt);
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// Register a finalizer to clean up the native thread resources.
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_Jv_RegisterFinalizer (data, finalize_native);
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_Jv_MutexInit (&nt->join_mutex);
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_Jv_CondInit (&nt->join_cond);
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nt->thread = _Jv_ThreadInitData (this);
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// FIXME: if JNI_ENV is set we will want to free it. It is
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// malloc()d.
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nt->jni_env = NULL;
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}
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static void
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finalize_native (jobject ptr)
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{
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natThread *nt = (natThread *) ptr;
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_Jv_ThreadDestroyData (nt->thread);
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}
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jint
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java::lang::Thread::countStackFrames (void)
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{
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// NOTE: This is deprecated in JDK 1.2.
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JvFail ("java::lang::Thread::countStackFrames unimplemented");
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return 0;
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}
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java::lang::Thread *
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java::lang::Thread::currentThread (void)
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{
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return _Jv_ThreadCurrent ();
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}
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void
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java::lang::Thread::destroy (void)
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{
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// NOTE: This is marked as unimplemented in the JDK 1.2
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// documentation.
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JvFail ("java::lang::Thread::destroy unimplemented");
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}
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void
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java::lang::Thread::interrupt (void)
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{
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natThread *nt = (natThread *) data;
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_Jv_ThreadInterrupt (nt->thread);
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}
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void
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java::lang::Thread::join (jlong millis, jint nanos)
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{
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if (millis < 0 || nanos < 0 || nanos > 999999)
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throw new IllegalArgumentException;
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Thread *current = currentThread ();
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// Here `NT' is the native structure for the thread we are trying to join.
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natThread *nt = (natThread *) data;
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// Now wait for: (1) an interrupt, (2) the thread to exit, or (3)
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// the timeout to occur.
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_Jv_MutexLock (&nt->join_mutex);
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if (! isAlive ())
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{
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_Jv_MutexUnlock (&nt->join_mutex);
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return;
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}
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_Jv_CondWait (&nt->join_cond, &nt->join_mutex, millis, nanos);
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_Jv_MutexUnlock (&nt->join_mutex);
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if (current->isInterrupted (true))
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throw new InterruptedException;
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}
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void
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java::lang::Thread::resume (void)
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{
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checkAccess ();
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JvFail ("java::lang::Thread::resume unimplemented");
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}
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void
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java::lang::Thread::setPriority (jint newPriority)
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{
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checkAccess ();
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if (newPriority < MIN_PRIORITY || newPriority > MAX_PRIORITY)
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throw new IllegalArgumentException;
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jint gmax = group->getMaxPriority();
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if (newPriority > gmax)
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newPriority = gmax;
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priority = newPriority;
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natThread *nt = (natThread *) data;
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_Jv_ThreadSetPriority (nt->thread, priority);
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}
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void
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java::lang::Thread::sleep (jlong millis, jint nanos)
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{
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if (millis < 0 || nanos < 0 || nanos > 999999)
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throw new IllegalArgumentException;
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if (millis == 0 && nanos == 0)
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++nanos;
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Thread *current = currentThread ();
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// We use a condition variable to implement sleeping so that an
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// interrupt can wake us up.
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natThread *nt = (natThread *) current->data;
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_Jv_MutexLock (&nt->join_mutex);
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_Jv_CondWait (&nt->join_cond, &nt->join_mutex, millis, nanos);
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_Jv_MutexUnlock (&nt->join_mutex);
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if (current->isInterrupted (true))
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throw new InterruptedException;
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}
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void
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java::lang::Thread::finish_ ()
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{
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natThread *nt = (natThread *) data;
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group->removeThread (this);
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#ifdef ENABLE_JVMPI
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if (_Jv_JVMPI_Notify_THREAD_END)
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{
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JVMPI_Event event;
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event.event_type = JVMPI_EVENT_THREAD_END;
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event.env_id = _Jv_GetCurrentJNIEnv ();
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_Jv_DisableGC ();
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(*_Jv_JVMPI_Notify_THREAD_END) (&event);
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_Jv_EnableGC ();
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}
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#endif
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group = NULL;
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// Signal any threads that are waiting to join() us.
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_Jv_MutexLock (&nt->join_mutex);
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alive_flag = false;
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_Jv_CondNotifyAll (&nt->join_cond, &nt->join_mutex);
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_Jv_MutexUnlock (&nt->join_mutex);
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}
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void
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java::lang::Thread::run_ (jobject obj)
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{
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java::lang::Thread *thread = (java::lang::Thread *) obj;
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try
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{
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#ifdef ENABLE_JVMPI
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if (_Jv_JVMPI_Notify_THREAD_START)
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{
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JVMPI_Event event;
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jstring thread_name = thread->getName ();
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jstring group_name = NULL, parent_name = NULL;
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java::lang::ThreadGroup *group = thread->getThreadGroup ();
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if (group)
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{
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group_name = group->getName ();
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group = group->getParent ();
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if (group)
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parent_name = group->getName ();
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}
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int thread_len = thread_name ? JvGetStringUTFLength (thread_name) : 0;
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int group_len = group_name ? JvGetStringUTFLength (group_name) : 0;
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int parent_len = parent_name ? JvGetStringUTFLength (parent_name) : 0;
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char thread_chars[thread_len + 1];
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char group_chars[group_len + 1];
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char parent_chars[parent_len + 1];
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if (thread_name)
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JvGetStringUTFRegion (thread_name, 0,
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thread_name->length(), thread_chars);
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if (group_name)
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JvGetStringUTFRegion (group_name, 0,
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group_name->length(), group_chars);
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if (parent_name)
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JvGetStringUTFRegion (parent_name, 0,
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parent_name->length(), parent_chars);
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thread_chars[thread_len] = '\0';
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group_chars[group_len] = '\0';
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parent_chars[parent_len] = '\0';
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event.event_type = JVMPI_EVENT_THREAD_START;
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event.env_id = NULL;
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event.u.thread_start.thread_name = thread_chars;
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event.u.thread_start.group_name = group_chars;
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event.u.thread_start.parent_name = parent_chars;
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event.u.thread_start.thread_id = (jobjectID) thread;
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event.u.thread_start.thread_env_id = _Jv_GetCurrentJNIEnv ();
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_Jv_DisableGC ();
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(*_Jv_JVMPI_Notify_THREAD_START) (&event);
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_Jv_EnableGC ();
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}
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#endif
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thread->run ();
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}
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catch (java::lang::Throwable *t)
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{
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// Uncaught exceptions are forwarded to the ThreadGroup. If
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// this results in an uncaught exception, that is ignored.
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try
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{
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thread->group->uncaughtException (thread, t);
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}
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catch (java::lang::Throwable *f)
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{
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// Nothing.
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}
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}
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thread->finish_ ();
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}
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void
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java::lang::Thread::start (void)
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{
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JvSynchronize sync (this);
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// Its illegal to re-start() a thread, even if its dead.
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if (!startable_flag)
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throw new IllegalThreadStateException;
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alive_flag = true;
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startable_flag = false;
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natThread *nt = (natThread *) data;
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_Jv_ThreadStart (this, nt->thread, (_Jv_ThreadStartFunc *) &run_);
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}
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void
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java::lang::Thread::stop (java::lang::Throwable *)
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{
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throw new UnsupportedOperationException
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(JvNewStringLatin1 ("java::lang::Thread::stop unimplemented"));
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}
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void
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java::lang::Thread::suspend (void)
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{
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checkAccess ();
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throw new UnsupportedOperationException
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(JvNewStringLatin1 ("java::lang::Thread::suspend unimplemented"));
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}
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static int nextThreadNumber = 0;
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jstring
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java::lang::Thread::gen_name (void)
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{
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jint i;
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jclass sync = &java::lang::Thread::class$;
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{
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JvSynchronize dummy(sync);
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i = ++nextThreadNumber;
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}
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// Use an array large enough for "-2147483648"; i.e. 11 chars, + "Thread-".
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jchar buffer[7+11];
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jchar *bufend = (jchar *) ((char *) buffer + sizeof(buffer));
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i = _Jv_FormatInt (bufend, i);
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jchar *ptr = bufend - i;
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// Prepend "Thread-".
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*--ptr = '-';
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*--ptr = 'd';
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*--ptr = 'a';
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*--ptr = 'e';
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*--ptr = 'r';
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*--ptr = 'h';
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*--ptr = 'T';
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return JvNewString (ptr, bufend - ptr);
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}
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void
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java::lang::Thread::yield (void)
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{
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_Jv_ThreadYield ();
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}
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JNIEnv *
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_Jv_GetCurrentJNIEnv ()
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{
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java::lang::Thread *t = _Jv_ThreadCurrent ();
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if (t == NULL)
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return NULL;
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return ((natThread *) t->data)->jni_env;
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}
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void
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_Jv_SetCurrentJNIEnv (JNIEnv *env)
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{
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java::lang::Thread *t = _Jv_ThreadCurrent ();
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JvAssert (t != NULL);
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((natThread *) t->data)->jni_env = env;
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}
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java::lang::Thread*
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_Jv_AttachCurrentThread(jstring name, java::lang::ThreadGroup* group)
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{
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java::lang::Thread *thread = _Jv_ThreadCurrent ();
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if (thread != NULL)
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return thread;
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if (name == NULL)
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name = java::lang::Thread::gen_name ();
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thread = new java::lang::Thread (NULL, group, NULL, name);
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thread->startable_flag = false;
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thread->alive_flag = true;
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natThread *nt = (natThread *) thread->data;
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_Jv_ThreadRegister (nt->thread);
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return thread;
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}
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jint
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_Jv_DetachCurrentThread (void)
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{
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java::lang::Thread *t = _Jv_ThreadCurrent ();
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if (t == NULL)
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return -1;
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_Jv_ThreadUnRegister ();
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// Release the monitors.
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t->finish_ ();
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return 0;
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}
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