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//===-- MemoryMonitorMacOSX.mm --------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/MemoryMonitor.h"
#include <cassert>
#include <dispatch/dispatch.h>
using namespace lldb_private;
class MemoryMonitorMacOSX : public MemoryMonitor {
using MemoryMonitor::MemoryMonitor;
void Start() override {
m_memory_pressure_source = dispatch_source_create(
DISPATCH_SOURCE_TYPE_MEMORYPRESSURE, 0,
DISPATCH_MEMORYPRESSURE_WARN | DISPATCH_MEMORYPRESSURE_CRITICAL,
dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0));
if (!m_memory_pressure_source)
return;
dispatch_source_set_event_handler(m_memory_pressure_source, ^{
dispatch_source_memorypressure_flags_t pressureLevel =
dispatch_source_get_data(m_memory_pressure_source);
if (pressureLevel &
(DISPATCH_MEMORYPRESSURE_WARN | DISPATCH_MEMORYPRESSURE_CRITICAL)) {
m_callback();
}
});
dispatch_activate(m_memory_pressure_source);
}
void Stop() override {
if (m_memory_pressure_source) {
dispatch_source_cancel(m_memory_pressure_source);
dispatch_release(m_memory_pressure_source);
}
}
private:
dispatch_source_t m_memory_pressure_source;
};
std::unique_ptr<MemoryMonitor> MemoryMonitor::Create(Callback callback) {
return std::make_unique<MemoryMonitorMacOSX>(callback);
}
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