Add unblock_no_ipi function and use in context switch

src/context/context.rs

@@ -294,10 +294,7 @@ impl Context {
 
     /// Unblock context, and return true if it was blocked before being marked runnable
     pub fn unblock(&mut self) -> bool {
-        if self.status.is_soft_blocked() {
-            self.status = Status::Runnable;
-            self.status_reason = "";
-
+        if self.unblock_no_ipi() {
             if let Some(cpu_id) = self.cpu_id {
                if cpu_id != crate::cpu_id() {
                     // Send IPI if not on current CPU

src/context/switch.rs

@@ -60,12 +60,12 @@ unsafe fn update_runnable(context: &mut Context, cpu_id: LogicalCpuId) -> bool {
             regs.set_singlestep(was_singlestep);
         }
 
-        context.unblock();
+        context.unblock_no_ipi();
     }
 
     // Unblock when there are pending signals
     if context.status.is_soft_blocked() && !context.pending.is_empty() {
-        context.unblock();
+        context.unblock_no_ipi();
     }
 
     // Wake from sleep
@@ -75,7 +75,7 @@ unsafe fn update_runnable(context: &mut Context, cpu_id: LogicalCpuId) -> bool {
         let current = time::monotonic();
         if current >= wake {
             context.wake = None;
-            context.unblock();
+            context.unblock_no_ipi();
         }
     }