1 files changed, 93 insertions, 0 deletions
diff --git a/rts/posix/itimer/TimerCreate.c b/rts/posix/itimer/TimerCreate.c
new file mode 100644
index 0000000000..a4fb2b5b58
--- /dev/null
+++ b/rts/posix/itimer/TimerCreate.c
@@ -0,0 +1,93 @@
+/* -----------------------------------------------------------------------------
+ *
+ * (c) The GHC Team, 1995-2007
+ *
+ * Interval timer for profiling and pre-emptive scheduling.
+ *
+ * ---------------------------------------------------------------------------*/
+
+#include "PosixSource.h"
+#include "Rts.h"
+
+#include "Ticker.h"
+#include "posix/Itimer.h"
+#include "Proftimer.h"
+#include "Schedule.h"
+#include "posix/Clock.h"
+#include "posix/Signals.h"
+
+#ifdef HAVE_SIGNAL_H
+# include <signal.h>
+#endif
+
+#include <string.h>
+
+static Time itimer_interval = DEFAULT_TICK_INTERVAL;
+static timer_t timer;
+
+void
+initTicker (Time interval, TickProc handle_tick)
+{
+    itimer_interval = interval;
+
+    struct sigevent ev;
+
+    // Keep programs like valgrind happy
+    memset(&ev, 0, sizeof(ev));
+
+    ev.sigev_notify = SIGEV_SIGNAL;
+    ev.sigev_signo  = SIGVTALRM;
+
+    if (timer_create(CLOCK_ID, &ev, &timer) != 0) {
+        sysErrorBelch("timer_create");
+        stg_exit(EXIT_FAILURE);
+    }
+
+    install_vtalrm_handler(SIGVTALRM, handle_tick);
+}
+
+void
+startTicker(void)
+{
+    struct itimerspec it;
+
+    it.it_value.tv_sec  = TimeToSeconds(itimer_interval);
+    it.it_value.tv_nsec = TimeToNS(itimer_interval) % 1000000000;
+    it.it_interval = it.it_value;
+
+    if (timer_settime(timer, 0, &it, NULL) != 0) {
+        sysErrorBelch("timer_settime");
+        stg_exit(EXIT_FAILURE);
+    }
+}
+
+void
+stopTicker(void)
+{
+    struct itimerspec it;
+
+    it.it_value.tv_sec = 0;
+    it.it_value.tv_nsec = 0;
+    it.it_interval = it.it_value;
+
+    if (timer_settime(timer, 0, &it, NULL) != 0) {
+        sysErrorBelch("timer_settime");
+        stg_exit(EXIT_FAILURE);
+    }
+}
+
+void
+exitTicker (rtsBool wait STG_UNUSED)
+{
+    // Before deleting the timer set the signal to ignore to avoid the
+    // possibility of the signal being delivered after the timer is deleted.
+    signal(SIGVTALRM, SIG_IGN);
+    timer_delete(timer);
+    // ignore errors - we don't really care if it fails.
+}
+
+int
+rtsTimerSignal(void)
+{
+    return SIGVTALRM;
+}