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comparison: gfx/skia/trunk/src/ports/SkPurgeableMemoryBlock_mac.cpp
gfx/skia/trunk/src/ports/SkPurgeableMemoryBlock_mac.cpp
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| -1:000000000000 | 0:dcafbc003de2 |
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| 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 */ | |
| 7 | |
| 8 #include "SkPurgeableMemoryBlock.h" | |
| 9 | |
| 10 #include <mach/mach.h> | |
| 11 | |
| 12 bool SkPurgeableMemoryBlock::IsSupported() { | |
| 13 return true; | |
| 14 } | |
| 15 | |
| 16 #ifdef SK_DEBUG | |
| 17 bool SkPurgeableMemoryBlock::PlatformSupportsPurgingAllUnpinnedBlocks() { | |
| 18 return true; | |
| 19 } | |
| 20 | |
| 21 bool SkPurgeableMemoryBlock::PurgeAllUnpinnedBlocks() { | |
| 22 // Unused. | |
| 23 int state = 0; | |
| 24 kern_return_t ret = vm_purgable_control(mach_task_self(), 0, VM_PURGABLE_PURGE_ALL, &state); | |
| 25 return ret == KERN_SUCCESS; | |
| 26 } | |
| 27 | |
| 28 bool SkPurgeableMemoryBlock::purge() { | |
| 29 return false; | |
| 30 } | |
| 31 #endif | |
| 32 | |
| 33 static size_t round_to_page_size(size_t size) { | |
| 34 const size_t mask = 4096 - 1; | |
| 35 return (size + mask) & ~mask; | |
| 36 } | |
| 37 | |
| 38 SkPurgeableMemoryBlock::SkPurgeableMemoryBlock(size_t size) | |
| 39 : fAddr(NULL) | |
| 40 , fSize(round_to_page_size(size)) | |
| 41 , fPinned(false) { | |
| 42 } | |
| 43 | |
| 44 SkPurgeableMemoryBlock::~SkPurgeableMemoryBlock() { | |
| 45 SkDEBUGCODE(kern_return_t ret =) vm_deallocate(mach_task_self(), | |
| 46 reinterpret_cast<vm_address_t>(fAddr), | |
| 47 static_cast<vm_size_t>(fSize)); | |
| 48 #ifdef SK_DEBUG | |
| 49 if (ret != KERN_SUCCESS) { | |
| 50 SkDebugf("SkPurgeableMemoryBlock destructor failed to deallocate.\n"); | |
| 51 } | |
| 52 #endif | |
| 53 } | |
| 54 | |
| 55 void* SkPurgeableMemoryBlock::pin(SkPurgeableMemoryBlock::PinResult* pinResult) { | |
| 56 SkASSERT(!fPinned); | |
| 57 SkASSERT(pinResult != NULL); | |
| 58 if (NULL == fAddr) { | |
| 59 vm_address_t addr = 0; | |
| 60 kern_return_t ret = vm_allocate(mach_task_self(), &addr, static_cast<vm_size_t>(fSize), | |
| 61 VM_FLAGS_PURGABLE | VM_FLAGS_ANYWHERE); | |
| 62 if (KERN_SUCCESS == ret) { | |
| 63 fAddr = reinterpret_cast<void*>(addr); | |
| 64 *pinResult = kUninitialized_PinResult; | |
| 65 fPinned = true; | |
| 66 } else { | |
| 67 fAddr = NULL; | |
| 68 } | |
| 69 } else { | |
| 70 int state = VM_PURGABLE_NONVOLATILE; | |
| 71 kern_return_t ret = vm_purgable_control(mach_task_self(), | |
| 72 reinterpret_cast<vm_address_t>(fAddr), | |
| 73 VM_PURGABLE_SET_STATE, &state); | |
| 74 if (ret != KERN_SUCCESS) { | |
| 75 fAddr = NULL; | |
| 76 fPinned = false; | |
| 77 return NULL; | |
| 78 } | |
| 79 | |
| 80 fPinned = true; | |
| 81 | |
| 82 if (state & VM_PURGABLE_EMPTY) { | |
| 83 *pinResult = kUninitialized_PinResult; | |
| 84 } else { | |
| 85 *pinResult = kRetained_PinResult; | |
| 86 } | |
| 87 } | |
| 88 return fAddr; | |
| 89 } | |
| 90 | |
| 91 void SkPurgeableMemoryBlock::unpin() { | |
| 92 SkASSERT(fPinned); | |
| 93 int state = VM_PURGABLE_VOLATILE | VM_VOLATILE_GROUP_DEFAULT; | |
| 94 SkDEBUGCODE(kern_return_t ret =) vm_purgable_control(mach_task_self(), | |
| 95 reinterpret_cast<vm_address_t>(fAddr), | |
| 96 VM_PURGABLE_SET_STATE, &state); | |
| 97 fPinned = false; | |
| 98 | |
| 99 #ifdef SK_DEBUG | |
| 100 if (ret != KERN_SUCCESS) { | |
| 101 SkDebugf("SkPurgeableMemoryBlock::unpin() failed.\n"); | |
| 102 } | |
| 103 #endif | |
| 104 } |
