90 lines
1.8 KiB
C++
90 lines
1.8 KiB
C++
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// Copyright (c) 2011, NetEase Inc. All rights reserved.
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//
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// Author: wrt(guangguang)
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// Date: 2011/6/24
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//
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// The base class of a cross flatform waitable event
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#include "base/synchronization/waitable_event.h"
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#if defined(OS_WIN)
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#include <math.h>
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#include <assert.h>
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#include "base/time/time.h"
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namespace nbase
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{
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WaitableEvent::WaitableEvent(bool manual_reset, bool initially_signaled)
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{
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handle_ = ::CreateEventW(NULL, manual_reset, initially_signaled, NULL);
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}
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WaitableEvent::WaitableEvent(HANDLE handle)
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{
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handle_ = handle;
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}
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HANDLE WaitableEvent::Release()
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{
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HANDLE old_handle = handle_;
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handle_ = NULL;
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return old_handle;
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}
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WaitableEvent::~WaitableEvent()
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{
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if (handle_)
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::CloseHandle(handle_);
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}
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void WaitableEvent::Reset()
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{
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assert(handle_);
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::ResetEvent(handle_);
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}
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void WaitableEvent::Signal()
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{
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assert(handle_);
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::SetEvent(handle_);
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}
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bool WaitableEvent::IsSignaled()
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{
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assert(handle_);
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return ::WaitForSingleObject(handle_, 0) == WAIT_OBJECT_0;
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}
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bool WaitableEvent::Wait()
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{
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assert(handle_);
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return WAIT_OBJECT_0 == ::WaitForSingleObject(handle_, INFINITE);
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}
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bool WaitableEvent::WaitTimeout(const TimeDelta &timeout)
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{
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assert(handle_);
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assert(timeout.ToMillisecondsF() >= 0.0);
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DWORD wait_result = ::WaitForSingleObject(handle_, static_cast<DWORD>(ceil(timeout.ToMillisecondsF())));
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return WAIT_OBJECT_0 == wait_result;
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}
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size_t WaitableEvent::WaitMultiple(WaitableEvent **events, size_t count)
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{
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HANDLE handles[MAXIMUM_WAIT_OBJECTS];
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assert(count <= MAXIMUM_WAIT_OBJECTS);
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for (size_t i = 0; i < count; i++)
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handles[i] = events[i]->handle_;
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DWORD wait_result = ::WaitForMultipleObjects(static_cast<DWORD>(count),
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handles,
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FALSE,
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INFINITE);
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if (wait_result >= WAIT_OBJECT_0 + count)
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return 0;
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return wait_result - WAIT_OBJECT_0;
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}
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} // namespace nbase
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#endif // OS_WIN
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