gfx/skia/trunk/src/ports/SkDiscardableMemory_ashmem.cpp@129ffea94266 (annotated)
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.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright 2013 Google Inc. |
| michael@0 | 3 | * |
| michael@0 | 4 | * Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 5 | * found in the LICENSE file. |
| michael@0 | 6 | */ |
| michael@0 | 7 | |
| michael@0 | 8 | #include <unistd.h> |
| michael@0 | 9 | #include <sys/mman.h> |
| michael@0 | 10 | #include "SkDiscardableMemory.h" |
| michael@0 | 11 | #include "SkTypes.h" |
| michael@0 | 12 | #include "android/ashmem.h" |
| michael@0 | 13 | |
| michael@0 | 14 | //////////////////////////////////////////////////////////////////////////////// |
| michael@0 | 15 | namespace { |
| michael@0 | 16 | /** |
| michael@0 | 17 | * DiscardableMemory implementation that uses the Android kernel's |
| michael@0 | 18 | * ashmem (Android shared memory). |
| michael@0 | 19 | */ |
| michael@0 | 20 | class SkAshmemDiscardableMemory : public SkDiscardableMemory { |
| michael@0 | 21 | public: |
| michael@0 | 22 | SkAshmemDiscardableMemory(int fd, void* address, size_t size); |
| michael@0 | 23 | virtual ~SkAshmemDiscardableMemory(); |
| michael@0 | 24 | virtual bool lock() SK_OVERRIDE; |
| michael@0 | 25 | virtual void* data() SK_OVERRIDE; |
| michael@0 | 26 | virtual void unlock() SK_OVERRIDE; |
| michael@0 | 27 | private: |
| michael@0 | 28 | bool fLocked; |
| michael@0 | 29 | int fFd; |
| michael@0 | 30 | void* fMemory; |
| michael@0 | 31 | const size_t fSize; |
| michael@0 | 32 | }; |
| michael@0 | 33 | |
| michael@0 | 34 | SkAshmemDiscardableMemory::SkAshmemDiscardableMemory(int fd, |
| michael@0 | 35 | void* address, |
| michael@0 | 36 | size_t size) |
| michael@0 | 37 | : fLocked(true) // Ashmem pages are pinned by default. |
| michael@0 | 38 | , fFd(fd) |
| michael@0 | 39 | , fMemory(address) |
| michael@0 | 40 | , fSize(size) { |
| michael@0 | 41 | SkASSERT(fFd >= 0); |
| michael@0 | 42 | SkASSERT(fMemory != NULL); |
| michael@0 | 43 | SkASSERT(fSize > 0); |
| michael@0 | 44 | } |
| michael@0 | 45 | |
| michael@0 | 46 | SkAshmemDiscardableMemory::~SkAshmemDiscardableMemory() { |
| michael@0 | 47 | SkASSERT(!fLocked); |
| michael@0 | 48 | if (NULL != fMemory) { |
| michael@0 | 49 | munmap(fMemory, fSize); |
| michael@0 | 50 | } |
| michael@0 | 51 | if (fFd != -1) { |
| michael@0 | 52 | close(fFd); |
| michael@0 | 53 | } |
| michael@0 | 54 | } |
| michael@0 | 55 | |
| michael@0 | 56 | bool SkAshmemDiscardableMemory::lock() { |
| michael@0 | 57 | SkASSERT(!fLocked); |
| michael@0 | 58 | if (-1 == fFd) { |
| michael@0 | 59 | fLocked = false; |
| michael@0 | 60 | return false; |
| michael@0 | 61 | } |
| michael@0 | 62 | SkASSERT(fMemory != NULL); |
| michael@0 | 63 | if (fLocked || (ASHMEM_NOT_PURGED == ashmem_pin_region(fFd, 0, 0))) { |
| michael@0 | 64 | fLocked = true; |
| michael@0 | 65 | return true; |
| michael@0 | 66 | } else { |
| michael@0 | 67 | munmap(fMemory, fSize); |
| michael@0 | 68 | fMemory = NULL; |
| michael@0 | 69 | |
| michael@0 | 70 | close(fFd); |
| michael@0 | 71 | fFd = -1; |
| michael@0 | 72 | fLocked = false; |
| michael@0 | 73 | return false; |
| michael@0 | 74 | } |
| michael@0 | 75 | } |
| michael@0 | 76 | |
| michael@0 | 77 | void* SkAshmemDiscardableMemory::data() { |
| michael@0 | 78 | SkASSERT(fLocked); |
| michael@0 | 79 | return fLocked ? fMemory : NULL; |
| michael@0 | 80 | } |
| michael@0 | 81 | |
| michael@0 | 82 | void SkAshmemDiscardableMemory::unlock() { |
| michael@0 | 83 | SkASSERT(fLocked); |
| michael@0 | 84 | if (fLocked && (fFd != -1)) { |
| michael@0 | 85 | ashmem_unpin_region(fFd, 0, 0); |
| michael@0 | 86 | } |
| michael@0 | 87 | fLocked = false; |
| michael@0 | 88 | } |
| michael@0 | 89 | } // namespace |
| michael@0 | 90 | //////////////////////////////////////////////////////////////////////////////// |
| michael@0 | 91 | |
| michael@0 | 92 | SkDiscardableMemory* SkDiscardableMemory::Create(size_t bytes) { |
| michael@0 | 93 | // ashmem likes lengths on page boundaries. |
| michael@0 | 94 | const size_t mask = getpagesize() - 1; |
| michael@0 | 95 | size_t size = (bytes + mask) & ~mask; |
| michael@0 | 96 | |
| michael@0 | 97 | static const char name[] = "Skia_Ashmem_Discardable_Memory"; |
| michael@0 | 98 | int fd = ashmem_create_region(name, size); |
| michael@0 | 99 | if (fd < 0) { |
| michael@0 | 100 | return NULL; |
| michael@0 | 101 | } |
| michael@0 | 102 | if (0 != ashmem_set_prot_region(fd, PROT_READ | PROT_WRITE)) { |
| michael@0 | 103 | close(fd); |
| michael@0 | 104 | return NULL; |
| michael@0 | 105 | } |
| michael@0 | 106 | void* addr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0); |
| michael@0 | 107 | if ((MAP_FAILED == addr) || (NULL == addr)) { |
| michael@0 | 108 | close(fd); |
| michael@0 | 109 | return NULL; |
| michael@0 | 110 | } |
| michael@0 | 111 | |
| michael@0 | 112 | return SkNEW_ARGS(SkAshmemDiscardableMemory, (fd, addr, size)); |
| michael@0 | 113 | } |
