svn commit: r363504 - stable/12/sys/kern

[Mateusz Guzik]

Author: mjg
Date: Sat Jul 25 00:03:23 2020
New Revision: 363504
URL: https://svnweb.freebsd.org/changeset/base/363504

Log:
  MFC r363297:
  
      Short-circuit tdfind when looking for the calling thread.

Modified:
  stable/12/sys/kern/kern_thread.c
Directory Properties:
  stable/12/   (props changed)

Modified: stable/12/sys/kern/kern_thread.c
==============================================================================
--- stable/12/sys/kern/kern_thread.c	Sat Jul 25 00:01:57 2020	(r363503)
+++ stable/12/sys/kern/kern_thread.c	Sat Jul 25 00:03:23 2020	(r363504)
@@ -1260,6 +1260,14 @@ tdfind(lwpid_t tid, pid_t pid)
 	struct thread *td;
 	int run = 0;
 
+	td = curthread;
+	if (td->td_tid == tid) {
+		if (pid != -1 && td->td_proc->p_pid != pid)
+			return (NULL);
+		PROC_LOCK(td->td_proc);
+		return (td);
+	}
+
 	rw_rlock(&tidhash_lock);
 	LIST_FOREACH(td, TIDHASH(tid), td_hash) {
 		if (td->td_tid == tid) {