From: Matthew Dillon <dillon@apollo.backplane.com>
Date: Fri, 2 Oct 2009 18:04:46 +0000 (-0700)
Subject: lwkt - Add lwkt_setpri_initial()
X-Git-Tag: v2.5.1~23
X-Git-Url: https://gitweb.dragonflybsd.org/dragonfly.git/commitdiff_plain/03bd0a5ed39b6b9a731f41c2ff793fa6a728ec39

lwkt - Add lwkt_setpri_initial()

* Add a lwkt_setpri_initial() call which has no cpu restriction but which
  requires the thread to not be scheduled.
---

diff --git a/sys/kern/lwkt_thread.c b/sys/kern/lwkt_thread.c
index a5177633cd..f4b1f8b615 100644
--- a/sys/kern/lwkt_thread.c
+++ b/sys/kern/lwkt_thread.c
@@ -1295,6 +1295,23 @@ lwkt_setpri(thread_t td, int pri)
     crit_exit();
 }
 
+/*
+ * Set the initial priority for a thread prior to it being scheduled for
+ * the first time.  The thread MUST NOT be scheduled before or during
+ * this call.  The thread may be assigned to a cpu other then the current
+ * cpu.
+ *
+ * Typically used after a thread has been created with TDF_STOPPREQ,
+ * and before the thread is initially scheduled.
+ */
+void
+lwkt_setpri_initial(thread_t td, int pri)
+{
+    KKASSERT(pri >= 0);
+    KKASSERT((td->td_flags & TDF_RUNQ) == 0);
+    td->td_pri = (td->td_pri & ~TDPRI_MASK) + pri;
+}
+
 void
 lwkt_setpri_self(int pri)
 {
diff --git a/sys/sys/thread.h b/sys/sys/thread.h
index 7cc006fd50..5c26a1c7fd 100644
--- a/sys/sys/thread.h
+++ b/sys/sys/thread.h
@@ -385,6 +385,7 @@ extern void lwkt_token_pool_init(void);
 extern lwkt_token_t lwkt_token_pool_get(void *);
 
 extern void lwkt_setpri(thread_t, int);
+extern void lwkt_setpri_initial(thread_t, int);
 extern void lwkt_setpri_self(int);
 extern int lwkt_check_resched(thread_t);
 extern void lwkt_setcpu_self(struct globaldata *);