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