mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-19 03:29:22 +00:00
b13cf98e6b
dependent portion of the lib/Support/SlowOperationTimer code into the lib/System implementation where it can be ported to different platforms. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24937 91177308-0d34-0410-b5e6-96231b3b80d8
69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
//===-- Alarm.inc - Implement Unix Alarm Support --------------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file was developed by the Reid Spencer and is distributed under the
|
|
// University of Illinois Open Source License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the UNIX Alarm support.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include <signal.h>
|
|
#include <unistd.h>
|
|
#include <cassert>
|
|
using namespace llvm;
|
|
|
|
/// AlarmCancelled - This flag is set by the SIGINT signal handler if the
|
|
/// user presses CTRL-C.
|
|
static volatile bool AlarmCancelled = false;
|
|
|
|
/// AlarmTriggered - This flag is set by the SIGALRM signal handler if the
|
|
/// alarm was triggered.
|
|
static volatile bool AlarmTriggered = false;
|
|
|
|
/// NestedSOI - Sanity check. Alarms cannot be nested or run in parallel.
|
|
/// This ensures that they never do.
|
|
static bool NestedSOI = false;
|
|
|
|
static RETSIGTYPE SigIntHandler(int Sig) {
|
|
AlarmCancelled = true;
|
|
signal(SIGINT, SigIntHandler);
|
|
}
|
|
|
|
static RETSIGTYPE SigAlarmHandler(int Sig) {
|
|
AlarmTriggered = true;
|
|
}
|
|
|
|
static void (*OldSigIntHandler) (int);
|
|
|
|
void sys::SetupAlarm(unsigned seconds) {
|
|
assert(!NestedSOI && "sys::SetupAlarm calls cannot be nested!");
|
|
NestedSOI = true;
|
|
AlarmCancelled = false;
|
|
AlarmTriggered = false;
|
|
::signal(SIGALRM, SigAlarmHandler);
|
|
OldSigIntHandler = ::signal(SIGINT, SigIntHandler);
|
|
::alarm(seconds);
|
|
}
|
|
|
|
void sys::TerminateAlarm() {
|
|
assert(NestedSOI && "sys::TerminateAlarm called without sys::SetupAlarm!");
|
|
::alarm(0);
|
|
::signal(SIGALRM, SIG_DFL);
|
|
::signal(SIGINT, OldSigIntHandler);
|
|
AlarmCancelled = false;
|
|
AlarmTriggered = false;
|
|
NestedSOI = false;
|
|
}
|
|
|
|
int sys::AlarmStatus() {
|
|
if (AlarmCancelled)
|
|
return -1;
|
|
if (AlarmTriggered)
|
|
return 1;
|
|
return 0;
|
|
}
|