gfx/skia/trunk/src/ports/SkPurgeableMemoryBlock_android.cpp@129ffea94266
gfx/skia/trunk/src/ports/SkPurgeableMemoryBlock_android.cpp
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
1 /*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
8 #include "SkPurgeableMemoryBlock.h"
10 #include "android/ashmem.h"
11 #include <sys/mman.h>
12 #include <unistd.h>
14 bool SkPurgeableMemoryBlock::IsSupported() {
15 return true;
16 }
18 #ifdef SK_DEBUG
19 bool SkPurgeableMemoryBlock::PlatformSupportsPurgingAllUnpinnedBlocks() {
20 return false;
21 }
23 bool SkPurgeableMemoryBlock::PurgeAllUnpinnedBlocks() {
24 return false;
25 }
27 bool SkPurgeableMemoryBlock::purge() {
28 SkASSERT(!fPinned);
29 if (-1 != fFD) {
30 ashmem_purge_all_caches(fFD);
31 return true;
32 } else {
33 return false;
34 }
35 }
36 #endif
38 // ashmem likes lengths on page boundaries.
39 static size_t round_to_page_size(size_t size) {
40 const size_t mask = getpagesize() - 1;
41 size_t newSize = (size + mask) & ~mask;
42 return newSize;
43 }
45 SkPurgeableMemoryBlock::SkPurgeableMemoryBlock(size_t size)
46 : fAddr(NULL)
47 , fSize(round_to_page_size(size))
48 , fPinned(false)
49 , fFD(-1) {
50 }
52 SkPurgeableMemoryBlock::~SkPurgeableMemoryBlock() {
53 if (-1 != fFD) {
54 munmap(fAddr, fSize);
55 close(fFD);
56 }
57 }
59 void* SkPurgeableMemoryBlock::pin(SkPurgeableMemoryBlock::PinResult* pinResult) {
60 SkASSERT(!fPinned);
61 if (-1 == fFD) {
62 int fd = ashmem_create_region(NULL, fSize);
63 if (-1 == fd) {
64 SkDebugf("ashmem_create_region failed\n");
65 return NULL;
66 }
68 int err = ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE);
69 if (err != 0) {
70 SkDebugf("ashmem_set_prot_region failed\n");
71 close(fd);
72 return NULL;
73 }
75 void* addr = mmap(NULL, fSize, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
76 if (-1 == (long) addr) {
77 SkDebugf("mmap failed\n");
78 close(fd);
79 return NULL;
80 }
81 fAddr = addr;
82 fFD = fd;
83 (void) ashmem_pin_region(fd, 0, 0);
84 *pinResult = kUninitialized_PinResult;
85 fPinned = true;
86 } else {
87 int pin = ashmem_pin_region(fFD, 0, 0);
88 if (ASHMEM_NOT_PURGED == pin) {
89 fPinned = true;
90 *pinResult = kRetained_PinResult;
91 } else if (ASHMEM_WAS_PURGED == pin) {
92 fPinned = true;
93 *pinResult = kUninitialized_PinResult;
94 } else {
95 // Failed.
96 munmap(fAddr, fSize);
97 close(fFD);
98 fFD = -1;
99 fAddr = NULL;
100 }
101 }
102 return fAddr;
103 }
105 void SkPurgeableMemoryBlock::unpin() {
106 if (-1 != fFD) {
107 ashmem_unpin_region(fFD, 0, 0);
108 fPinned = false;
109 }
110 }
