gomp-20050608-branch/libjava/gnu/gcj/runtime/natFinalizerThread.cc

   1 // natFinalizerThread.cc - Implementation of FinalizerThread native methods.
   2
   3 /* Copyright (C) 2001, 2004  Free Software Foundation
   4
   5    This file is part of libgcj.
   6
   7 This software is copyrighted work licensed under the terms of the
   8 Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
   9 details.  */
  10
  11 #include <config.h>
  12
  13 #include <gcj/cni.h>
  14 #include <jvm.h>
  15
  16 #include <gnu/gcj/runtime/FinalizerThread.h>
  17
  18 #include <java-threads.h>
  19
  20 static _Jv_Mutex_t mutex;
  21 static _Jv_ConditionVariable_t condition;
  22
  23 // Initialize lock & condition variable.
  24 void
  25 gnu::gcj::runtime::FinalizerThread::init ()
  26 {
  27   _Jv_MutexInit (&mutex);
  28   _Jv_CondInit (&condition);
  29 }
  30
  31 // This is called by the GC when a finalizer is ready to be
  32 // run.  It sets a flag and wakes up the finalizer thread. Note
  33 // that this MUST NOT aquire any Java lock, as this could result in
  34 // the hash synchronization code being re-entered: the synchronization
  35 // code itself might need to allocate. See PR 16478.
  36 void
  37 gnu::gcj::runtime::FinalizerThread::finalizerReady ()
  38 {
  39 #ifdef __JV_NO_THREADS__
  40   _Jv_RunFinalizers ();
  41 #else
  42   _Jv_MutexLock (&mutex);
  43   finalizer_ready = true;
  44   _Jv_CondNotify (&condition, &mutex);
  45   _Jv_MutexUnlock (&mutex);
  46 #endif
  47 }
  48
  49 // Main loop for the finalizer thread.
  50 void
  51 gnu::gcj::runtime::FinalizerThread::run ()
  52 {
  53   while (true)
  54     {
  55       _Jv_MutexLock (&mutex);
  56       if (! finalizer_ready)
  57         _Jv_CondWait (&condition, &mutex, 0, 0);
  58       finalizer_ready = false;
  59       _Jv_MutexUnlock (&mutex);
  60       _Jv_RunFinalizers ();
  61     }
  62 }