forked from OSchip/llvm-project
73 lines
1.9 KiB
C++
73 lines
1.9 KiB
C++
//===-- Alarm.inc - Implement Unix Alarm 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 implements the UNIX Alarm support.
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//
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//===----------------------------------------------------------------------===//
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#include <signal.h>
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#include <unistd.h>
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#include <cassert>
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using namespace llvm;
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/// AlarmCancelled - This flag is set by the SIGINT signal handler if the
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/// user presses CTRL-C.
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static volatile bool AlarmCancelled = false;
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/// AlarmTriggered - This flag is set by the SIGALRM signal handler if the
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/// alarm was triggered.
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static volatile bool AlarmTriggered = false;
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/// NestedSOI - Sanity check. Alarms cannot be nested or run in parallel.
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/// This ensures that they never do.
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static bool NestedSOI = false;
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static RETSIGTYPE SigIntHandler(int Sig) {
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AlarmCancelled = true;
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signal(SIGINT, SigIntHandler);
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}
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static RETSIGTYPE SigAlarmHandler(int Sig) {
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AlarmTriggered = true;
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}
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static void (*OldSigIntHandler) (int);
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void sys::SetupAlarm(unsigned seconds) {
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assert(!NestedSOI && "sys::SetupAlarm calls cannot be nested!");
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NestedSOI = true;
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AlarmCancelled = false;
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AlarmTriggered = false;
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::signal(SIGALRM, SigAlarmHandler);
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OldSigIntHandler = ::signal(SIGINT, SigIntHandler);
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::alarm(seconds);
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}
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void sys::TerminateAlarm() {
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assert(NestedSOI && "sys::TerminateAlarm called without sys::SetupAlarm!");
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::alarm(0);
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::signal(SIGALRM, SIG_DFL);
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::signal(SIGINT, OldSigIntHandler);
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AlarmCancelled = false;
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AlarmTriggered = false;
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NestedSOI = false;
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}
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int sys::AlarmStatus() {
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if (AlarmCancelled)
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return -1;
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if (AlarmTriggered)
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return 1;
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return 0;
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}
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void sys::Sleep(unsigned n) {
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::sleep(n);
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}
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