sched/pthread: There is no need to use sched_[un]lock

Signed-off-by: hujun5 <hujun5@xiaomi.com>

sched/pthread/pthread_create.c

@@ -442,8 +442,6 @@ int nx_pthread_create(pthread_trampoline_t trampoline, FAR pthread_t *thread,
 #endif
     }
 
-  sched_lock();
-
   /* Return the thread information to the caller */
 
   if (thread != NULL)
@@ -455,8 +453,6 @@ int nx_pthread_create(pthread_trampoline_t trampoline, FAR pthread_t *thread,
 
   nxtask_activate((FAR struct tcb_s *)ptcb);
 
-  sched_unlock();
-
   return OK;
 
 errout_with_tcb:

sched/pthread/pthread_mutex.c

@@ -150,10 +150,6 @@ int pthread_mutex_take(FAR struct pthread_mutex_s *mutex,
   DEBUGASSERT(mutex != NULL);
   if (mutex != NULL)
     {
-      /* Make sure that no unexpected context switches occur */
-
-      sched_lock();
-
       /* Error out if the mutex is already in an inconsistent state. */
 
       if ((mutex->flags & _PTHREAD_MFLAGS_INCONSISTENT) != 0)
@@ -201,8 +197,6 @@ int pthread_mutex_take(FAR struct pthread_mutex_s *mutex,
                 }
             }
         }
-
-      sched_unlock();
     }
 
   return ret;
@@ -234,10 +228,6 @@ int pthread_mutex_trytake(FAR struct pthread_mutex_s *mutex)
   DEBUGASSERT(mutex != NULL);
   if (mutex != NULL)
     {
-      /* Make sure that no unexpected context switches occur */
-
-      sched_lock();
-
       /* Error out if the mutex is already in an inconsistent state. */
 
       if ((mutex->flags & _PTHREAD_MFLAGS_INCONSISTENT) != 0)
@@ -269,8 +259,6 @@ int pthread_mutex_trytake(FAR struct pthread_mutex_s *mutex)
               pthread_mutex_add(mutex);
             }
         }
-
-      sched_unlock();
     }
 
   return ret;

sched/pthread/pthread_mutexconsistent.c

@@ -84,10 +84,6 @@ int pthread_mutex_consistent(FAR pthread_mutex_t *mutex)
     {
       pid_t pid;
 
-      /* Make sure the mutex is stable while we make the following checks. */
-
-      sched_lock();
-
       pid = mutex_get_holder(&mutex->mutex);
 
       /* Is the mutex available? */
@@ -133,8 +129,6 @@ int pthread_mutex_consistent(FAR pthread_mutex_t *mutex)
           mutex->flags &= _PTHREAD_MFLAGS_ROBUST;
           ret = OK;
         }
-
-      sched_unlock();
     }
 
   sinfo("Returning %d\n", ret);

sched/pthread/pthread_mutexdestroy.c

@@ -69,12 +69,6 @@ int pthread_mutex_destroy(FAR pthread_mutex_t *mutex)
     {
       pid_t pid;
 
-      /* Make sure the semaphore is stable while we make the following
-       * checks.
-       */
-
-      sched_lock();
-
       pid = mutex_get_holder(&mutex->mutex);
 
       /* Is the mutex available? */
@@ -141,8 +135,6 @@ int pthread_mutex_destroy(FAR pthread_mutex_t *mutex)
           status = mutex_destroy(&mutex->mutex);
           ret = ((status < 0) ? -status : OK);
         }
-
-      sched_unlock();
     }
 
   sinfo("Returning %d\n", ret);

sched/pthread/pthread_mutextrylock.c

@@ -82,12 +82,6 @@ int pthread_mutex_trylock(FAR pthread_mutex_t *mutex)
       pid_t pid = mutex_get_holder(&mutex->mutex);
 #endif
 
-      /* Make sure the semaphore is stable while we make the following
-       * checks.  This all needs to be one atomic action.
-       */
-
-      sched_lock();
-
       /* Try to get the semaphore. */
 
       status = pthread_mutex_trytake(mutex);
@@ -163,8 +157,6 @@ int pthread_mutex_trylock(FAR pthread_mutex_t *mutex)
         {
           ret = status;
         }
-
-      sched_unlock();
     }
 
   sinfo("Returning %d\n", ret);