Index: include/time.h
===================================================================
--- include/time.h	(revision 184492)
+++ include/time.h	(working copy)
@@ -108,6 +108,7 @@
 #define CLOCK_MONOTONIC_PRECISE	11	/* FreeBSD-specific. */
 #define CLOCK_MONOTONIC_FAST	12	/* FreeBSD-specific. */
 #define CLOCK_SECOND	13		/* FreeBSD-specific. */
+#define CLOCK_THREAD_CPUTIME_ID	14
 #endif /* !defined(CLOCK_REALTIME) && __POSIX_VISIBLE >= 200112 */
 
 #if !defined(TIMER_ABSTIME) && __POSIX_VISIBLE >= 200112
Index: include/unistd.h
===================================================================
--- include/unistd.h	(revision 184492)
+++ include/unistd.h	(working copy)
@@ -111,7 +111,7 @@
 #define	_POSIX_SPIN_LOCKS		200112L
 #define	_POSIX_THREAD_ATTR_STACKADDR	200112L
 #define	_POSIX_THREAD_ATTR_STACKSIZE	200112L
-#define	_POSIX_THREAD_CPUTIME		-1
+#define	_POSIX_THREAD_CPUTIME		200112L
 #define	_POSIX_THREAD_PRIO_INHERIT	200112L
 #define	_POSIX_THREAD_PRIO_PROTECT	200112L
 #define	_POSIX_THREAD_PRIORITY_SCHEDULING 200112L
Index: sys/sys/time.h
===================================================================
--- sys/sys/time.h	(revision 184492)
+++ sys/sys/time.h	(working copy)
@@ -246,6 +246,7 @@
 #define CLOCK_MONOTONIC_PRECISE	11	/* FreeBSD-specific. */
 #define CLOCK_MONOTONIC_FAST	12	/* FreeBSD-specific. */
 #define CLOCK_SECOND	13		/* FreeBSD-specific. */
+#define CLOCK_THREAD_CPUTIME_ID	14
 #endif
 
 #ifndef TIMER_ABSTIME
Index: sys/kern/kern_time.c
===================================================================
--- sys/kern/kern_time.c	(revision 184492)
+++ sys/kern/kern_time.c	(working copy)
@@ -201,6 +201,7 @@
 {
 	struct timeval sys, user;
 	struct proc *p;
+	uint64_t runtime, curtime, switchtime;
 
 	p = td->td_proc;
 	switch (clock_id) {
@@ -242,6 +243,16 @@
 		ats->tv_sec = time_second;
 		ats->tv_nsec = 0;
 		break;
+	case CLOCK_THREAD_CPUTIME_ID:
+		critical_enter();
+		switchtime = PCPU_GET(switchtime);
+		curtime = cpu_ticks();
+		runtime = td->td_runtime;
+		critical_exit();
+		runtime = cputick2usec(runtime + curtime - switchtime);
+		ats->tv_sec = runtime / 1000000;
+		ats->tv_nsec = runtime % 1000000 * 1000;
+		break;
 	default:
 		return (EINVAL);
 	}