gfx/skia/trunk/src/ports/SkDiscardableMemory_ashmem.cpp@129ffea94266
gfx/skia/trunk/src/ports/SkDiscardableMemory_ashmem.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 <unistd.h>
9 #include <sys/mman.h>
10 #include "SkDiscardableMemory.h"
11 #include "SkTypes.h"
12 #include "android/ashmem.h"
14 ////////////////////////////////////////////////////////////////////////////////
15 namespace {
16 /**
17 * DiscardableMemory implementation that uses the Android kernel's
18 * ashmem (Android shared memory).
19 */
20 class SkAshmemDiscardableMemory : public SkDiscardableMemory {
21 public:
22 SkAshmemDiscardableMemory(int fd, void* address, size_t size);
23 virtual ~SkAshmemDiscardableMemory();
24 virtual bool lock() SK_OVERRIDE;
25 virtual void* data() SK_OVERRIDE;
26 virtual void unlock() SK_OVERRIDE;
27 private:
28 bool fLocked;
29 int fFd;
30 void* fMemory;
31 const size_t fSize;
32 };
34 SkAshmemDiscardableMemory::SkAshmemDiscardableMemory(int fd,
35 void* address,
36 size_t size)
37 : fLocked(true) // Ashmem pages are pinned by default.
38 , fFd(fd)
39 , fMemory(address)
40 , fSize(size) {
41 SkASSERT(fFd >= 0);
42 SkASSERT(fMemory != NULL);
43 SkASSERT(fSize > 0);
44 }
46 SkAshmemDiscardableMemory::~SkAshmemDiscardableMemory() {
47 SkASSERT(!fLocked);
48 if (NULL != fMemory) {
49 munmap(fMemory, fSize);
50 }
51 if (fFd != -1) {
52 close(fFd);
53 }
54 }
56 bool SkAshmemDiscardableMemory::lock() {
57 SkASSERT(!fLocked);
58 if (-1 == fFd) {
59 fLocked = false;
60 return false;
61 }
62 SkASSERT(fMemory != NULL);
63 if (fLocked || (ASHMEM_NOT_PURGED == ashmem_pin_region(fFd, 0, 0))) {
64 fLocked = true;
65 return true;
66 } else {
67 munmap(fMemory, fSize);
68 fMemory = NULL;
70 close(fFd);
71 fFd = -1;
72 fLocked = false;
73 return false;
74 }
75 }
77 void* SkAshmemDiscardableMemory::data() {
78 SkASSERT(fLocked);
79 return fLocked ? fMemory : NULL;
80 }
82 void SkAshmemDiscardableMemory::unlock() {
83 SkASSERT(fLocked);
84 if (fLocked && (fFd != -1)) {
85 ashmem_unpin_region(fFd, 0, 0);
86 }
87 fLocked = false;
88 }
89 } // namespace
90 ////////////////////////////////////////////////////////////////////////////////
92 SkDiscardableMemory* SkDiscardableMemory::Create(size_t bytes) {
93 // ashmem likes lengths on page boundaries.
94 const size_t mask = getpagesize() - 1;
95 size_t size = (bytes + mask) & ~mask;
97 static const char name[] = "Skia_Ashmem_Discardable_Memory";
98 int fd = ashmem_create_region(name, size);
99 if (fd < 0) {
100 return NULL;
101 }
102 if (0 != ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE)) {
103 close(fd);
104 return NULL;
105 }
106 void* addr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
107 if ((MAP_FAILED == addr) || (NULL == addr)) {
108 close(fd);
109 return NULL;
110 }
112 return SkNEW_ARGS(SkAshmemDiscardableMemory, (fd, addr, size));
113 }
