From 84a539885335c629100a6a12b57ead54bbbc0165 Mon Sep 17 00:00:00 2001
From: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date: Thu, 21 Apr 2016 06:32:16 +0200
Subject: score: Avoid Giant lock for CORE rwlock

Update #2555.
---
 cpukit/posix/src/prwlockrdlock.c | 56 ++++++++++++----------------------------
 1 file changed, 17 insertions(+), 39 deletions(-)

(limited to 'cpukit/posix/src/prwlockrdlock.c')

diff --git a/cpukit/posix/src/prwlockrdlock.c b/cpukit/posix/src/prwlockrdlock.c
index 7d1bcaa9f4..3459399c6b 100644
--- a/cpukit/posix/src/prwlockrdlock.c
+++ b/cpukit/posix/src/prwlockrdlock.c
@@ -18,53 +18,31 @@
 #include "config.h"
 #endif
 
-#include <pthread.h>
-#include <errno.h>
-
 #include <rtems/posix/rwlockimpl.h>
-#include <rtems/score/thread.h>
-
-/**
- * This directive attempts to obtain a read only lock on an rwlock instance.
- *
- * @param[in] rwlock is the pointer to rwlock id
- *
- * @retval 0 if successful
- * @retval error_code if unsuccessful
- */
 
 int pthread_rwlock_rdlock(
   pthread_rwlock_t  *rwlock
 )
 {
-  POSIX_RWLock_Control  *the_rwlock;
-  Objects_Locations      location;
-  Thread_Control        *executing;
-
-  the_rwlock = _POSIX_RWLock_Get( rwlock, &location );
-  switch ( location ) {
-
-    case OBJECTS_LOCAL:
+  POSIX_RWLock_Control *the_rwlock;
+  ISR_lock_Context      lock_context;
+  Thread_Control       *executing;
 
-      executing = _Thread_Executing;
-      _CORE_RWLock_Seize_for_reading(
-        &the_rwlock->RWLock,
-        executing,
-        true,                 /* we are willing to wait forever */
-        0
-      );
+  the_rwlock = _POSIX_RWLock_Get( rwlock, &lock_context );
 
-      _Objects_Put( &the_rwlock->Object );
-      return _POSIX_RWLock_Translate_core_RWLock_return_code(
-        (CORE_RWLock_Status) executing->Wait.return_code
-      );
-
-#if defined(RTEMS_MULTIPROCESSING)
-    case OBJECTS_REMOTE:
-#endif
-    case OBJECTS_ERROR:
-      break;
+  if ( the_rwlock == NULL ) {
+    return EINVAL;
   }
 
-  return EINVAL;
+  executing = _Thread_Executing;
+  _CORE_RWLock_Seize_for_reading(
+    &the_rwlock->RWLock,
+    executing,
+    true,                 /* we are willing to wait forever */
+    0,
+    &lock_context
+  );
+  return _POSIX_RWLock_Translate_core_RWLock_return_code(
+    (CORE_RWLock_Status) executing->Wait.return_code
+  );
 }
-- 
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