From 3493dab23bb39950d0181db97c3db9374c185f8b Mon Sep 17 00:00:00 2001
From: Reid Spencer <rspencer@reidspencer.com>
Date: Thu, 22 Dec 2005 03:23:46 +0000
Subject: Implement a generic polled Alarm function. This merely removes the
 system dependent portion of the lib/Support/SlowOperationTimer code into the
 lib/System implementation where it can be ported to different platforms.

llvm-svn: 24937
---
 llvm/lib/System/Alarm.cpp       | 34 +++++++++++++++++++++
 llvm/lib/System/Unix/Alarm.inc  | 68 +++++++++++++++++++++++++++++++++++++++++
 llvm/lib/System/Win32/Alarm.inc | 36 ++++++++++++++++++++++
 3 files changed, 138 insertions(+)
 create mode 100644 llvm/lib/System/Alarm.cpp
 create mode 100644 llvm/lib/System/Unix/Alarm.inc
 create mode 100644 llvm/lib/System/Win32/Alarm.inc

(limited to 'llvm/lib/System')

diff --git a/llvm/lib/System/Alarm.cpp b/llvm/lib/System/Alarm.cpp
new file mode 100644
index 00000000000..d782b293e33
--- /dev/null
+++ b/llvm/lib/System/Alarm.cpp
@@ -0,0 +1,34 @@
+//===- Alarm.cpp - Alarm Generation Support ---------------------*- C++ -*-===//
+//
+//                     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 Alarm functionality 
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/System/Alarm.h"
+#include "llvm/Config/config.h"
+
+namespace llvm {
+using namespace sys;
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only TRULY operating system
+//===          independent code.
+//===----------------------------------------------------------------------===//
+
+}
+
+// Include the platform-specific parts of this class.
+#ifdef LLVM_ON_UNIX
+#include "Unix/Alarm.inc"
+#endif
+#ifdef LLVM_ON_WIN32
+#include "Win32/Alarm.inc"
+#endif
+
diff --git a/llvm/lib/System/Unix/Alarm.inc b/llvm/lib/System/Unix/Alarm.inc
new file mode 100644
index 00000000000..1480802a32c
--- /dev/null
+++ b/llvm/lib/System/Unix/Alarm.inc
@@ -0,0 +1,68 @@
+//===-- 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;
+}
diff --git a/llvm/lib/System/Win32/Alarm.inc b/llvm/lib/System/Win32/Alarm.inc
new file mode 100644
index 00000000000..e4ac5128a3d
--- /dev/null
+++ b/llvm/lib/System/Win32/Alarm.inc
@@ -0,0 +1,36 @@
+//===-- Alarm.inc - Implement Win32 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 Win32 Alarm support.
+//
+//===----------------------------------------------------------------------===//
+
+#include <cassert>
+using namespace llvm;
+
+/// NestedSOI - Sanity check.  Alarms cannot be nested or run in parallel.  
+/// This ensures that they never do.
+static bool NestedSOI = false;
+
+void sys::SetupAlarm(unsigned seconds) {
+  assert(!NestedSOI && "sys::SetupAlarm calls cannot be nested!");
+  NestedSOI = true;
+  // FIXME: Implement for Win32
+}
+
+void sys::TerminateAlarm() {
+  assert(NestedSOI && "sys::TerminateAlarm called without sys::SetupAlarm!");
+  // FIXME: Implement for Win32
+  NestedSOI = false;
+}
+
+int sys::AlarmStatus() {
+  // FIXME: Implement for Win32
+  return 0;
+}
-- 
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