| /* 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(); |
| } |
| |
| |