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Unified Diff: src/ports/SkPurgeableMemoryBlock_mac.cpp

Issue 12645006: Create a platform-dependent object for accessing purgeable memory. (Closed) Base URL: https://skia.googlecode.com/svn/trunk
Patch Set: Build mac version on iOS as well. Created 7 years, 9 months ago
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Index: src/ports/SkPurgeableMemoryBlock_mac.cpp
diff --git a/src/ports/SkPurgeableMemoryBlock_mac.cpp b/src/ports/SkPurgeableMemoryBlock_mac.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..5c44895fc3ca4fe1921df42e007db2ccb6479945
--- /dev/null
+++ b/src/ports/SkPurgeableMemoryBlock_mac.cpp
@@ -0,0 +1,105 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkPurgeableMemoryBlock.h"
+
+#include <mach/mach.h>
+
+bool SkPurgeableMemoryBlock::IsSupported() {
+ return true;
+}
+
+#ifdef SK_DEBUG
+bool SkPurgeableMemoryBlock::PlatformSupportsPurgingAllUnpinnedBlocks() {
+ return true;
+}
+
+bool SkPurgeableMemoryBlock::PurgeAllUnpinnedBlocks() {
+ // Unused.
+ int state = 0;
+ kern_return_t ret = vm_purgable_control(mach_task_self(), 0, VM_PURGABLE_PURGE_ALL, &state);
+ return ret == KERN_SUCCESS;
+}
+
+bool SkPurgeableMemoryBlock::purge() {
+ return false;
+}
+#endif
+
+static size_t round_to_page_size(size_t size) {
+ const size_t mask = 4096 - 1;
+ return (size + mask) & ~mask;
+}
+
+SkPurgeableMemoryBlock::SkPurgeableMemoryBlock(size_t size)
+ : fAddr(NULL)
+ , fSize(round_to_page_size(size))
+ , fPinned(false) {
+}
+
+SkPurgeableMemoryBlock::~SkPurgeableMemoryBlock() {
+ SkDEBUGCODE(kern_return_t ret =) vm_deallocate(mach_task_self(),
+ reinterpret_cast<vm_address_t>(fAddr),
+ static_cast<vm_size_t>(fSize));
+#ifdef SK_DEBUG
+ if (ret != KERN_SUCCESS) {
+ SkDebugf("SkPurgeableMemoryBlock destructor failed to deallocate.\n");
+ }
+#endif
+}
+
+void* SkPurgeableMemoryBlock::pin(SkPurgeableMemoryBlock::PinResult* pinResult) {
+ SkASSERT(!fPinned);
+ SkASSERT(pinResult != NULL);
+ if (NULL == fAddr) {
+ vm_address_t addr = 0;
+ kern_return_t ret = vm_allocate(mach_task_self(), &addr, static_cast<vm_size_t>(fSize),
+ VM_FLAGS_PURGABLE | VM_FLAGS_ANYWHERE);
+ if (KERN_SUCCESS == ret) {
+ fAddr = reinterpret_cast<void*>(addr);
+ *pinResult = kUninitialized_PinResult;
+ fPinned = true;
+ } else {
+ fAddr = NULL;
+ }
+ } else {
+ int state = VM_PURGABLE_NONVOLATILE;
+ kern_return_t ret = vm_purgable_control(mach_task_self(),
+ reinterpret_cast<vm_address_t>(fAddr),
+ VM_PURGABLE_SET_STATE, &state);
+ if (ret != KERN_SUCCESS) {
+ fAddr = NULL;
+ fPinned = false;
+ return NULL;
+ }
+
+ fPinned = true;
+
+ if (state & VM_PURGABLE_EMPTY) {
+ *pinResult = kUninitialized_PinResult;
+ } else {
+ *pinResult = kRetained_PinResult;
+ }
+ }
+ return fAddr;
+}
+
+void SkPurgeableMemoryBlock::unpin() {
+ SkASSERT(fPinned);
+ int state = VM_PURGABLE_VOLATILE | VM_VOLATILE_GROUP_DEFAULT;
+ SkDEBUGCODE(kern_return_t ret =) vm_purgable_control(mach_task_self(),
+ reinterpret_cast<vm_address_t>(fAddr),
+ VM_PURGABLE_SET_STATE, &state);
+ fPinned = false;
+
+#ifdef SK_DEBUG
+ if (ret != KERN_SUCCESS) {
+ SkDebugf("SkPurgeableMemoryBlock::unpin() failed.\n");
+ }
+#endif
+}
+
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