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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /xpcom/base/nsMemoryImpl.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'xpcom/base/nsMemoryImpl.cpp')
-rw-r--r--xpcom/base/nsMemoryImpl.cpp184
1 files changed, 184 insertions, 0 deletions
diff --git a/xpcom/base/nsMemoryImpl.cpp b/xpcom/base/nsMemoryImpl.cpp
new file mode 100644
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+++ b/xpcom/base/nsMemoryImpl.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsMemoryImpl.h"
+#include "nsThreadUtils.h"
+
+#include "nsIObserver.h"
+#include "nsIObserverService.h"
+#include "nsISimpleEnumerator.h"
+
+#include "nsCOMPtr.h"
+#include "mozilla/Services.h"
+
+#ifdef ANDROID
+#include <stdio.h>
+
+// Minimum memory threshold for a device to be considered
+// a low memory platform. This value has be in sync with
+// Java's equivalent threshold, defined in
+// mobile/android/base/util/HardwareUtils.java
+#define LOW_MEMORY_THRESHOLD_KB (384 * 1024)
+#endif
+
+static nsMemoryImpl sGlobalMemory;
+
+NS_IMPL_QUERY_INTERFACE(nsMemoryImpl, nsIMemory)
+
+NS_IMETHODIMP
+nsMemoryImpl::HeapMinimize(bool aImmediate)
+{
+ return FlushMemory(u"heap-minimize", aImmediate);
+}
+
+NS_IMETHODIMP
+nsMemoryImpl::IsLowMemoryPlatform(bool* aResult)
+{
+#ifdef ANDROID
+ static int sLowMemory = -1; // initialize to unknown, lazily evaluate to 0 or 1
+ if (sLowMemory == -1) {
+ sLowMemory = 0; // assume "not low memory" in case file operations fail
+ *aResult = false;
+
+ // check if MemTotal from /proc/meminfo is less than LOW_MEMORY_THRESHOLD_KB
+ FILE* fd = fopen("/proc/meminfo", "r");
+ if (!fd) {
+ return NS_OK;
+ }
+ uint64_t mem = 0;
+ int rv = fscanf(fd, "MemTotal: %llu kB", &mem);
+ if (fclose(fd)) {
+ return NS_OK;
+ }
+ if (rv != 1) {
+ return NS_OK;
+ }
+ sLowMemory = (mem < LOW_MEMORY_THRESHOLD_KB) ? 1 : 0;
+ }
+ *aResult = (sLowMemory == 1);
+#else
+ *aResult = false;
+#endif
+ return NS_OK;
+}
+
+/*static*/ nsresult
+nsMemoryImpl::Create(nsISupports* aOuter, const nsIID& aIID, void** aResult)
+{
+ if (NS_WARN_IF(aOuter)) {
+ return NS_ERROR_NO_AGGREGATION;
+ }
+ return sGlobalMemory.QueryInterface(aIID, aResult);
+}
+
+nsresult
+nsMemoryImpl::FlushMemory(const char16_t* aReason, bool aImmediate)
+{
+ nsresult rv = NS_OK;
+
+ if (aImmediate) {
+ // They've asked us to run the flusher *immediately*. We've
+ // got to be on the UI main thread for us to be able to do
+ // that...are we?
+ if (!NS_IsMainThread()) {
+ NS_ERROR("can't synchronously flush memory: not on UI thread");
+ return NS_ERROR_FAILURE;
+ }
+ }
+
+ bool lastVal = sIsFlushing.exchange(true);
+ if (lastVal) {
+ return NS_OK;
+ }
+
+ PRIntervalTime now = PR_IntervalNow();
+
+ // Run the flushers immediately if we can; otherwise, proxy to the
+ // UI thread an run 'em asynchronously.
+ if (aImmediate) {
+ rv = RunFlushers(aReason);
+ } else {
+ // Don't broadcast more than once every 1000ms to avoid being noisy
+ if (PR_IntervalToMicroseconds(now - sLastFlushTime) > 1000) {
+ sFlushEvent.mReason = aReason;
+ rv = NS_DispatchToMainThread(&sFlushEvent);
+ }
+ }
+
+ sLastFlushTime = now;
+ return rv;
+}
+
+nsresult
+nsMemoryImpl::RunFlushers(const char16_t* aReason)
+{
+ nsCOMPtr<nsIObserverService> os = mozilla::services::GetObserverService();
+ if (os) {
+
+ // Instead of:
+ // os->NotifyObservers(this, "memory-pressure", aReason);
+ // we are going to do this manually to see who/what is
+ // deallocating.
+
+ nsCOMPtr<nsISimpleEnumerator> e;
+ os->EnumerateObservers("memory-pressure", getter_AddRefs(e));
+
+ if (e) {
+ nsCOMPtr<nsIObserver> observer;
+ bool loop = true;
+
+ while (NS_SUCCEEDED(e->HasMoreElements(&loop)) && loop) {
+ nsCOMPtr<nsISupports> supports;
+ e->GetNext(getter_AddRefs(supports));
+
+ if (!supports) {
+ continue;
+ }
+
+ observer = do_QueryInterface(supports);
+ observer->Observe(observer, "memory-pressure", aReason);
+ }
+ }
+ }
+
+ sIsFlushing = false;
+ return NS_OK;
+}
+
+// XXX need NS_IMPL_STATIC_ADDREF/RELEASE
+NS_IMETHODIMP_(MozExternalRefCountType)
+nsMemoryImpl::FlushEvent::AddRef()
+{
+ return 2;
+}
+NS_IMETHODIMP_(MozExternalRefCountType)
+nsMemoryImpl::FlushEvent::Release()
+{
+ return 1;
+}
+NS_IMPL_QUERY_INTERFACE(nsMemoryImpl::FlushEvent, nsIRunnable)
+
+NS_IMETHODIMP
+nsMemoryImpl::FlushEvent::Run()
+{
+ sGlobalMemory.RunFlushers(mReason);
+ return NS_OK;
+}
+
+mozilla::Atomic<bool>
+nsMemoryImpl::sIsFlushing;
+
+PRIntervalTime
+nsMemoryImpl::sLastFlushTime = 0;
+
+nsMemoryImpl::FlushEvent
+nsMemoryImpl::sFlushEvent;
+
+nsresult
+NS_GetMemoryManager(nsIMemory** aResult)
+{
+ return sGlobalMemory.QueryInterface(NS_GET_IID(nsIMemory), (void**)aResult);
+}