From 425b1522d5df54aaf80eaf47a007cf9600b405d5 Mon Sep 17 00:00:00 2001
From: Matt Birkholz <puck@birchwood-abbey.net>
Date: Sat, 20 Dec 2014 09:05:57 -0700
Subject: [PATCH] smp: Add smp-wake primitive.

---
 src/microcode/ossmp.h   |  1 +
 src/microcode/prossmp.c | 24 ++++++++++++++++++++++++
 src/microcode/uxsig.c   |  6 ++++++
 3 files changed, 31 insertions(+)

diff --git a/src/microcode/ossmp.h b/src/microcode/ossmp.h
index 46a9c1be5..a51d0004d 100644
--- a/src/microcode/ossmp.h
+++ b/src/microcode/ossmp.h
@@ -71,6 +71,7 @@ extern bool smp_gc_started (void);
 extern void smp_gc_finished (void);
 
 extern void smp_kill_gc (pthread_t);
+extern void smp_kill_timer (pthread_t);
 
 #endif
 
diff --git a/src/microcode/prossmp.c b/src/microcode/prossmp.c
index fe5ee1ee0..eab9c4797 100644
--- a/src/microcode/prossmp.c
+++ b/src/microcode/prossmp.c
@@ -529,6 +529,30 @@ Wait for interrupts.")
 #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);
+    processor_t *p;
+    for (p = processors; p != NULL; p = p->next)
+      if (p->id == id)
+	{
+	  smp_kill_timer (p->pthread);
+	  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);
+}
+
 #ifdef ENABLE_SMP
 static SCHEME_OBJECT smp_idle_prim = SHARP_F;
 
diff --git a/src/microcode/uxsig.c b/src/microcode/uxsig.c
index 5b6347c9d..0d839f953 100644
--- a/src/microcode/uxsig.c
+++ b/src/microcode/uxsig.c
@@ -520,6 +520,12 @@ smp_kill_gc (pthread_t thread)
   pthread_kill (thread, SIGUSR2);
 }
 
+void
+smp_kill_timer (pthread_t thread)
+{
+  pthread_kill (thread, SIGALRM);
+}
+
 #endif /* ENABLE_SMP */
 
 /* The following conditionalization would more naturally be expressed
-- 
2.25.1