diff --git a/sched/signal/sig_kill.c b/sched/signal/sig_kill.c
index 3b6d6f09ed4..f62848eedad 100644
--- a/sched/signal/sig_kill.c
+++ b/sched/signal/sig_kill.c
@@ -79,7 +79,6 @@ int nxsig_kill(pid_t pid, int signo)
   FAR struct tcb_s *rtcb = this_task();
 #endif
   siginfo_t info;
-  int ret;
 
   /* We do not support sending signals to process groups */
 
@@ -95,10 +94,6 @@ int nxsig_kill(pid_t pid, int signo)
       return -EINVAL;
     }
 
-  /* Keep things stationary through the following */
-
-  sched_lock();
-
   /* Create the siginfo structure */
 
   info.si_signo           = signo;
@@ -112,10 +107,7 @@ int nxsig_kill(pid_t pid, int signo)
 
   /* Send the signal */
 
-  ret = nxsig_dispatch(pid, &info);
-
-  sched_unlock();
-  return ret;
+  return nxsig_dispatch(pid, &info);
 }
 
 /****************************************************************************
diff --git a/sched/signal/sig_procmask.c b/sched/signal/sig_procmask.c
index c8aeac23527..93d74c3c129 100644
--- a/sched/signal/sig_procmask.c
+++ b/sched/signal/sig_procmask.c
@@ -91,8 +91,6 @@ int nxsig_procmask(int how, FAR const sigset_t *set, FAR sigset_t *oset)
   irqstate_t flags;
   int        ret = OK;
 
-  sched_lock();
-
   /* Return the old signal mask if requested */
 
   if (oset != NULL)
@@ -148,7 +146,6 @@ int nxsig_procmask(int how, FAR const sigset_t *set, FAR sigset_t *oset)
       nxsig_unmask_pendingsignal();
     }
 
-  sched_unlock();
   return ret;
 }
 
diff --git a/sched/signal/sig_queue.c b/sched/signal/sig_queue.c
index a611f63cc2b..2b5f5556782 100644
--- a/sched/signal/sig_queue.c
+++ b/sched/signal/sig_queue.c
@@ -80,7 +80,6 @@ int nxsig_queue(int pid, int signo, union sigval value)
   FAR struct tcb_s *rtcb = this_task();
 #endif
   siginfo_t info;
-  int ret;
 
   sinfo("pid=0x%08x signo=%d value=%d\n", pid, signo, value.sival_int);
 
@@ -105,11 +104,7 @@ int nxsig_queue(int pid, int signo, union sigval value)
 
   /* Send the signal */
 
-  sched_lock();
-  ret = nxsig_dispatch(pid, &info);
-  sched_unlock();
-
-  return ret;
+  return nxsig_dispatch(pid, &info);
 }
 
 /****************************************************************************
diff --git a/sched/signal/sig_tgkill.c b/sched/signal/sig_tgkill.c
index 3f09ca248d4..d1c04d87eda 100644
--- a/sched/signal/sig_tgkill.c
+++ b/sched/signal/sig_tgkill.c
@@ -89,10 +89,6 @@ int tgkill(pid_t pid, pid_t tid, int signo)
       goto errout;
     }
 
-  /* Keep things stationary through the following */
-
-  sched_lock();
-
   /* Create the siginfo structure */
 
   info.si_signo           = signo;
@@ -110,7 +106,7 @@ int tgkill(pid_t pid, pid_t tid, int signo)
   if (!stcb)
     {
       ret = -ESRCH;
-      goto errout_with_lock;
+      goto errout;
     }
 
   /* Dispatch the signal to thread, bypassing normal task group thread
@@ -118,7 +114,6 @@ int tgkill(pid_t pid, pid_t tid, int signo)
    */
 
   ret = nxsig_tcbdispatch(stcb, &info);
-  sched_unlock();
 
   if (ret < 0)
     {
@@ -127,8 +122,6 @@ int tgkill(pid_t pid, pid_t tid, int signo)
 
   return OK;
 
-errout_with_lock:
-  sched_unlock();
 errout:
   set_errno(-ret);
   return ERROR;