The Tor Browser / file comparison
comparison: xpcom/threads/nsMemoryPressure.cpp
xpcom/threads/nsMemoryPressure.cpp
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:aff030bbedff |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim:set ts=2 sw=2 sts=2 et cindent: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #include "nsMemoryPressure.h" | |
| 8 #include "mozilla/Assertions.h" | |
| 9 #include "mozilla/Atomics.h" | |
| 10 | |
| 11 #include "nsThreadUtils.h" | |
| 12 | |
| 13 using namespace mozilla; | |
| 14 | |
| 15 static Atomic<int32_t, Relaxed> sMemoryPressurePending; | |
| 16 static_assert(MemPressure_None == 0, | |
| 17 "Bad static initialization with the default constructor."); | |
| 18 | |
| 19 MemoryPressureState | |
| 20 NS_GetPendingMemoryPressure() | |
| 21 { | |
| 22 int32_t value = sMemoryPressurePending.exchange(MemPressure_None); | |
| 23 return MemoryPressureState(value); | |
| 24 } | |
| 25 | |
| 26 void | |
| 27 NS_DispatchEventualMemoryPressure(MemoryPressureState state) | |
| 28 { | |
| 29 /* | |
| 30 * A new memory pressure event erases an ongoing memory pressure, but an | |
| 31 * existing "new" memory pressure event takes precedence over a new "ongoing" | |
| 32 * memory pressure event. | |
| 33 */ | |
| 34 switch (state) { | |
| 35 case MemPressure_None: | |
| 36 sMemoryPressurePending = MemPressure_None; | |
| 37 break; | |
| 38 case MemPressure_New: | |
| 39 sMemoryPressurePending = MemPressure_New; | |
| 40 break; | |
| 41 case MemPressure_Ongoing: | |
| 42 sMemoryPressurePending.compareExchange(MemPressure_None, MemPressure_Ongoing); | |
| 43 break; | |
| 44 } | |
| 45 } | |
| 46 | |
| 47 nsresult | |
| 48 NS_DispatchMemoryPressure(MemoryPressureState state) | |
| 49 { | |
| 50 NS_DispatchEventualMemoryPressure(state); | |
| 51 nsCOMPtr<nsIRunnable> event = new nsRunnable; | |
| 52 return NS_DispatchToMainThread(event); | |
| 53 } |
