RefCountedObject.cc

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00001 /*
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00005  * install, copy or use the software.
00006  * 
00007  * Intel Open Source License 
00008  * 
00009  * Copyright (c) 2006 Intel Corporation. All rights reserved. 
00010  * 
00011  * Redistribution and use in source and binary forms, with or without
00012  * modification, are permitted provided that the following conditions are
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00014  * 
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00018  *   Redistributions in binary form must reproduce the above copyright
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00024  *   this software without specific prior written permission.
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00038 
00039 #include "RefCountedObject.h"
00040 
00041 namespace oasys {
00042 
00043 //----------------------------------------------------------------------
00044 RefCountedObject::RefCountedObject(const char* logpath)
00045     : refcount_(0),
00046       logger_("RefCountedObject", logpath)
00047 {
00048 }
00049 
00050 //----------------------------------------------------------------------
00051 RefCountedObject::~RefCountedObject()
00052 {
00053 }
00054 
00055 //----------------------------------------------------------------------
00056 void
00057 RefCountedObject::add_ref(const char* what1, const char* what2) const
00058 {
00059     atomic_incr(&refcount_);
00060     
00061     logger_.logf(LOG_DEBUG,
00062                  "refcount *%p %u -> %u add %s %s",
00063                  this, refcount_.value - 1, refcount_.value, what1, what2);
00064     
00065     ASSERT(refcount_.value > 0);
00066 }
00067 
00068 //----------------------------------------------------------------------
00069 void
00070 RefCountedObject::del_ref(const char* what1, const char* what2) const
00071 {
00072     ASSERT(refcount_.value > 0);
00073 
00074     logger_.logf(LOG_DEBUG,
00075                  "refcount *%p %d -> %d del %s %s",
00076                  this, refcount_.value, refcount_.value - 1, what1, what2);
00077     
00078     // atomic_decr_test will only return true if the currently
00079     // executing thread is the one that sent the refcount to zero.
00080     // hence we are safe in knowing that there are no other references
00081     // on the object, and that only one thread will call
00082     // no_more_refs()
00083     
00084     if (atomic_decr_test(&refcount_)) {
00085         ASSERT(refcount_.value == 0);
00086         no_more_refs();
00087     }
00088 }
00089 
00090 //----------------------------------------------------------------------
00091 void
00092 RefCountedObject::no_more_refs() const
00093 {
00094     logger_.logf(LOG_DEBUG, "no_more_refs *%p... deleting object", this);
00095     delete this;
00096 }
00097 
00098 //----------------------------------------------------------------------
00099 int
00100 RefCountedObject::format(char* buf, size_t sz) const
00101 {
00102     return snprintf(buf, sz, "RefCountedObject %p", this);
00103 }
00104 
00105 } // namespace oasys

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