зеркало из https://github.com/mozilla/gecko-dev.git
49 строки
1.3 KiB
C++
49 строки
1.3 KiB
C++
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#include "nsMemoryPressure.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/Atomics.h"
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#include "nsThreadUtils.h"
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using namespace mozilla;
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static Atomic<int32_t, Relaxed> sMemoryPressurePending;
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MOZ_STATIC_ASSERT(MemPressure_None == 0,
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"Bad static initialization with the default constructor.");
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MemoryPressureState
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NS_GetPendingMemoryPressure()
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{
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int32_t value = sMemoryPressurePending.exchange(MemPressure_None);
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return MemoryPressureState(value);
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}
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void
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NS_DispatchEventualMemoryPressure(MemoryPressureState state)
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{
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/*
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* A new memory pressure event erases an ongoing memory pressure, but an
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* existing "new" memory pressure event takes precedence over a new "ongoing"
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* memory pressure event.
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*/
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switch (state) {
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case MemPressure_None:
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sMemoryPressurePending = MemPressure_None;
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break;
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case MemPressure_New:
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sMemoryPressurePending = MemPressure_New;
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break;
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case MemPressure_Ongoing:
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sMemoryPressurePending.compareExchange(MemPressure_None, MemPressure_Ongoing);
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break;
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}
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}
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nsresult
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NS_DispatchMemoryPressure(MemoryPressureState state)
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{
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NS_DispatchEventualMemoryPressure(state);
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nsCOMPtr<nsIRunnable> event = new nsRunnable;
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NS_ENSURE_TRUE(event, NS_ERROR_OUT_OF_MEMORY);
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return NS_DispatchToMainThread(event);
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}
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