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52 lines
1.8 KiB
C++
52 lines
1.8 KiB
C++
//===- llvm/System/Alarm.h - Alarm Generation support ----------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides an operating system independent interface to alarm(2)
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// type functionality. The Alarm class allows a one-shot alarm to be set up
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// at some number of seconds in the future. When the alarm triggers, a method
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// is called to process the event
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SYSTEM_ALARM_H
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#define LLVM_SYSTEM_ALARM_H
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namespace llvm {
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namespace sys {
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/// This function registers an alarm to trigger some number of \p seconds in
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/// the future. When that time arrives, the AlarmStatus function will begin
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/// to return 1 instead of 0. The user must poll the status of the alarm by
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/// making occasional calls to AlarmStatus. If the user sends an interrupt
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/// signal, AlarmStatus will begin returning -1, even if the alarm event
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/// occurred.
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/// @returns nothing
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void SetupAlarm(
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unsigned seconds ///< Number of seconds in future when alarm arrives
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);
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/// This function terminates the alarm previously set up
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/// @returns nothing
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void TerminateAlarm();
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/// This function acquires the status of the alarm.
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/// @returns -1=cancelled, 0=untriggered, 1=triggered
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int AlarmStatus();
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/// Sleep for n seconds. Warning: mixing calls to Sleep() and other *Alarm
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/// calls may be a bad idea on some platforms (source: Linux man page).
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/// @returns nothing.
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void Sleep(unsigned n);
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} // End sys namespace
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} // End llvm namespace
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#endif
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