When any of the executed timer hooks return B_INVOKE_SCHEDULER, let

timer_interrupt() return B_INVOKE_SCHEDULER. The scheduler itself uses a
timer hook and relies on scheduler_reschedule() to be called. Will make this
even more reliable in the next commit.
This might fix #3535.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34614 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/system/kernel/timer.cpp

@@ -77,6 +77,7 @@ timer_interrupt()
 	spinlock *spinlock;
 	per_cpu_timer_data& cpuData = sPerCPU[smp_get_current_cpu()];
 	int32 rc = B_HANDLED_INTERRUPT;
+	bool invokeScheduler = false;
 
 	TRACE(("timer_interrupt: time %lld, cpu %ld\n", system_time(),
 		smp_get_current_cpu()));
@@ -121,6 +122,9 @@ timer_interrupt()
 
 			if ((mode & B_TIMER_ACQUIRE_THREAD_LOCK) != 0)
 				RELEASE_THREAD_LOCK();
+
+			if (rc == B_INVOKE_SCHEDULER)
+				invokeScheduler = true;
 		}
 
 		cpuData.current_event_in_progress = 0;
@@ -153,7 +157,7 @@ timer_interrupt()
 
 	release_spinlock(spinlock);
 
-	return rc;
+	return invokeScheduler ? B_INVOKE_SCHEDULER : rc;
 }