From 6ced0cd9c04e4307a7e851e0d70b042801e40333 Mon Sep 17 00:00:00 2001
From: Matt Birkholz <puck@birchwood-abbey.net>
Date: Tue, 21 Jul 2015 13:13:06 -0700
Subject: [PATCH] Add SMP-WAKE primitive.

---
 src/microcode/ossmp.h   |  1 +
 src/microcode/prossmp.c | 23 +++++++++++++++++++++++
 src/microcode/uxsig.c   |  6 ++++++
 3 files changed, 30 insertions(+)

diff --git a/src/microcode/ossmp.h b/src/microcode/ossmp.h
index d5fc39bfb..61570364c 100644
--- a/src/microcode/ossmp.h
+++ b/src/microcode/ossmp.h
@@ -65,6 +65,7 @@ extern void smp_gc_start (void);
 extern void smp_gc_finish (void);
 
 extern void smp_kill_gc (processor_t *);
+extern void smp_kill_timer (processor_t *);
 
 #ifdef ENABLE_DEBUGGING_TOOLS
 
diff --git a/src/microcode/prossmp.c b/src/microcode/prossmp.c
index fabbaa4cd..8d02e58b4 100644
--- a/src/microcode/prossmp.c
+++ b/src/microcode/prossmp.c
@@ -359,6 +359,29 @@ access to the thread system.")
 #endif
 }
 
+DEFINE_PRIMITIVE ("SMP-WAKE", Prim_smp_wake, 1, 1, "(SMP-WAKE id)\n\
+Send a timer interrupt to processor ID.")
+{
+  PRIMITIVE_HEADER (0);
+
+#ifdef ENABLE_SMP
+  {
+    int id = arg_integer (1);
+    trace (";%d SMP-Wake %d.", self->id, id);
+    for (processor_t *p = processors; p != NULL; p = p->next)
+      if (p->id == id)
+	{
+	  smp_kill_timer (p);
+	  PRIMITIVE_RETURN (UNSPECIFIC);
+	}
+    outf_error_line (";%d smp-wake: bogus processor id %d", self->id, id);
+  }
+#else
+  signal_error_from_primitive (ERR_UNIMPLEMENTED_PRIMITIVE);
+#endif
+  PRIMITIVE_RETURN (UNSPECIFIC);
+}
+
 DEFINE_PRIMITIVE ("SMP-GC-WAIT", Prim_smp_gc_wait, 0, 0, "(SMP-GC-WAIT)\n\
 Put the current processor in the GC-WAIT state.\n\
 Called by the global-gc interrupt handler.")
diff --git a/src/microcode/uxsig.c b/src/microcode/uxsig.c
index 2f675f4c5..e00712e9b 100644
--- a/src/microcode/uxsig.c
+++ b/src/microcode/uxsig.c
@@ -519,6 +519,12 @@ smp_kill_gc (processor_t *p)
   pthread_kill (p->pthread, SIGUSR2);
 }
 
+void
+smp_kill_timer (processor_t *p)
+{
+  pthread_kill (p->pthread, SIGALRM);
+}
+
 #endif /* ENABLE_SMP */
 
 /* The following conditionalization would more naturally be expressed
-- 
2.25.1