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/* libs/graphics/sgl/SkGlobals.cpp
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
#include "SkGlobals.h"
#include "SkThread.h"
SkGlobals::Rec::~Rec()
{
}
SkGlobals::Rec* SkGlobals::Find(uint32_t tag, Rec* (*create_proc)())
{
SkGlobals::BootStrap& bootstrap = SkGlobals::GetBootStrap();
Rec* rec = bootstrap.fHead;
while (rec)
{
if (rec->fTag == tag)
return rec;
rec = rec->fNext;
}
if (create_proc == NULL) // no create proc, just return not found
return NULL;
// if we get here, we may need to create one. First grab the mutex, and
// search again, creating one if its not found the 2nd time.
bootstrap.fMutex.acquire();
// search again, now that we have the mutex. Odds are it won't be there, but we check again
// just in case it was added by another thread before we grabbed the mutex
Rec*& head = bootstrap.fHead;
rec = head;
while (rec)
{
if (rec->fTag == tag)
break;
rec = rec->fNext;
}
if (rec == NULL && (rec = create_proc()) != NULL)
{
rec->fTag = tag;
rec->fNext = head;
bootstrap.fHead = rec;
}
bootstrap.fMutex.release();
return rec;
}
void SkGlobals::Init()
{
}
void SkGlobals::Term()
{
SkGlobals::BootStrap& bootstrap = SkGlobals::GetBootStrap();
bootstrap.fMutex.acquire();
Rec*& head = bootstrap.fHead;
Rec* rec = head;
while (rec)
{
Rec* next = rec->fNext;
SkDELETE(rec);
rec = next;
}
bootstrap.fHead = NULL;
bootstrap.fMutex.release();
}
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