1 /* libs/graphics/sgl/SkGlobals.cpp
2 **
3 ** Copyright 2006, The Android Open Source Project
4 **
5 ** Licensed under the Apache License, Version 2.0 (the "License");
6 ** you may not use this file except in compliance with the License.
7 ** You may obtain a copy of the License at
8 **
9 ** http://www.apache.org/licenses/LICENSE-2.0
10 **
11 ** Unless required by applicable law or agreed to in writing, software
12 ** distributed under the License is distributed on an "AS IS" BASIS,
13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 ** See the License for the specific language governing permissions and
15 ** limitations under the License.
16 */
17
18 #include "SkGlobals.h"
19 #include "SkThread.h"
20
~Rec()21 SkGlobals::Rec::~Rec()
22 {
23 }
24
Find(uint32_t tag,Rec * (* create_proc)())25 SkGlobals::Rec* SkGlobals::Find(uint32_t tag, Rec* (*create_proc)())
26 {
27 SkGlobals::BootStrap& bootstrap = SkGlobals::GetBootStrap();
28
29 Rec* rec = bootstrap.fHead;
30 while (rec)
31 {
32 if (rec->fTag == tag)
33 return rec;
34 rec = rec->fNext;
35 }
36
37 if (create_proc == NULL) // no create proc, just return not found
38 return NULL;
39
40 // if we get here, we may need to create one. First grab the mutex, and
41 // search again, creating one if its not found the 2nd time.
42
43 bootstrap.fMutex.acquire();
44
45 // search again, now that we have the mutex. Odds are it won't be there, but we check again
46 // just in case it was added by another thread before we grabbed the mutex
47
48 Rec*& head = bootstrap.fHead;
49 rec = head;
50 while (rec)
51 {
52 if (rec->fTag == tag)
53 break;
54 rec = rec->fNext;
55 }
56
57 if (rec == NULL && (rec = create_proc()) != NULL)
58 {
59 rec->fTag = tag;
60 rec->fNext = head;
61 bootstrap.fHead = rec;
62 }
63
64 bootstrap.fMutex.release();
65 return rec;
66 }
67
Init()68 void SkGlobals::Init()
69 {
70 }
71
Term()72 void SkGlobals::Term()
73 {
74 SkGlobals::BootStrap& bootstrap = SkGlobals::GetBootStrap();
75
76 bootstrap.fMutex.acquire();
77
78 Rec*& head = bootstrap.fHead;
79 Rec* rec = head;
80
81 while (rec)
82 {
83 Rec* next = rec->fNext;
84 SkDELETE(rec);
85 rec = next;
86 }
87
88 bootstrap.fHead = NULL;
89 bootstrap.fMutex.release();
90 }
91
92
93