36 lines
1.0 KiB
V
36 lines
1.0 KiB
V
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// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module sync
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// We cannot simply use Mutex.lock() in the waitgroup.wait() method
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// as it will not block since it's used in the same thread.
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// docs:
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// Any thread with a handle to a mutex object can use one of the
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// wait functions to request ownership of the mutex object.
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// If the mutex object is owned by another thread, the wait
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// function blocks the requesting thread until the owning thread
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// releases the mutex object using the ReleaseMutex function.
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// Source:
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// https://docs.microsoft.com/en-us/windows/win32/sync/mutex-objects
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[ref_only]
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struct Waiter{
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mut:
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event MHANDLE
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}
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pub fn (mut w Waiter) wait() {
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C.WaitForSingleObject(w.event, C.INFINITE) // infinite wait
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}
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pub fn (mut w Waiter) stop() {
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C.SetEvent(w.event)
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}
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pub fn new_waiter() &Waiter {
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unsafe {
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sm := &Waiter{event: MHANDLE(C.CreateEvent(0, false, true, 0))}
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return sm
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}
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}
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