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-rw-r--r--src/sim/init.cc52
1 files changed, 48 insertions, 4 deletions
diff --git a/src/sim/init.cc b/src/sim/init.cc
index 0cebc417d..660fab62b 100644
--- a/src/sim/init.cc
+++ b/src/sim/init.cc
@@ -96,6 +96,37 @@ abortHandler(int sigtype)
ccprintf(cerr, "Program aborted at cycle %d\n", curTick());
}
+// Handle SIGIO
+static void
+ioHandler(int sigtype)
+{
+ async_event = true;
+ async_io = true;
+}
+
+// Handle SIGALRM
+static void
+alrmHandler(int sigtype)
+{
+ async_event = true;
+ async_alarm = true;
+ alarm(1);
+}
+
+static void
+installSignalHandler(int signal, void (*handler)(int sigtype))
+{
+ struct sigaction sa;
+
+ memset(&sa, 0, sizeof(sa));
+ sigemptyset(&sa.sa_mask);
+ sa.sa_handler = handler;
+ sa.sa_flags = SA_RESTART;
+
+ if (sigaction(signal, &sa, NULL) == -1)
+ panic("Failed to setup handler for signal %i\n", signal);
+}
+
/*
* M5 can do several special things when various signals are sent.
* None are mandatory.
@@ -111,16 +142,29 @@ initSignals()
signal(SIGTRAP, SIG_IGN);
// Dump intermediate stats
- signal(SIGUSR1, dumpStatsHandler);
+ installSignalHandler(SIGUSR1, dumpStatsHandler);
// Dump intermediate stats and reset them
- signal(SIGUSR2, dumprstStatsHandler);
+ installSignalHandler(SIGUSR2, dumprstStatsHandler);
// Exit cleanly on Interrupt (Ctrl-C)
- signal(SIGINT, exitNowHandler);
+ installSignalHandler(SIGINT, exitNowHandler);
// Print out cycle number on abort
- signal(SIGABRT, abortHandler);
+ installSignalHandler(SIGABRT, abortHandler);
+
+ // Install a SIGIO handler to handle asynchronous file IO. See the
+ // PollQueue class.
+ installSignalHandler(SIGIO, ioHandler);
+
+ // Setup an alarm handler that triggers every second. This
+ // triggers a PollQueue service just like a SIGIO. It is
+ // /probably/ used to work around a bug in the poll queue (likely
+ // a race between setting up a asynchronous IO and data becoming
+ // available), but its use isn't documented anywhere.
+ // TODO: Find out why this is needed and fix the original bug.
+ installSignalHandler(SIGALRM, alrmHandler);
+ alarm(1);
}
// The python library is totally messed up with respect to constness,