posix: Add self-contained pthread spinlock

Turn pthread_spinlock_t into a self-contained object.  On uni-processor
configurations, interrupts are disabled in the lock/trylock operations
and the previous interrupt status is restored in the corresponding
unlock operations.  On SMP configurations, a ticket lock is a acquired
and released in addition.

The self-contained pthread_spinlock_t object is defined by Newlib in
<sys/_pthreadtypes.h>.

typedef struct {
  struct _Ticket_lock_Control _lock;
  __uint32_t                  _interrupt_state;
} pthread_spinlock_t;

This implementation is simple and efficient.  However, this test case of
the Linux Test Project would fail due to call of printf() and sleep()
during spin lock ownership:

https://github.com/linux-test-project/ltp/blob/master/testcases/open_posix_testsuite/conformance/interfaces/pthread_spin_lock/1-2.c

There is only limited support for profiling on SMP configurations.

Delete CORE spinlock implementation.

Update #2674.

1 files changed, 0 insertions, 51 deletions

diff --git a/cpukit/posix/src/pspin.c b/cpukit/posix/src/pspin.c
deleted file mode 100644
index 6c466bcab5..0000000000
--- a/cpukit/posix/src/pspin.c
+++ /dev/null
@@ -1,51 +0,0 @@
-/**
- *  @file
- *
- *  This file contains the initialization of the POSIX Spinlock Manager.
- */
-
-/*
- *  COPYRIGHT (c) 1989-2013.
- *  On-Line Applications Research Corporation (OAR).
- *
- *  The license and distribution terms for this file may be
- *  found in the file LICENSE in this distribution or at
- *  http://www.rtems.org/license/LICENSE.
- */
-
-#if HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include <limits.h>
-
-#include <rtems/system.h>
-#include <rtems/config.h>
-#include <rtems/sysinit.h>
-#include <rtems/posix/spinlockimpl.h>
-
-Objects_Information _POSIX_Spinlock_Information;
-
-/**
- *  @brief _POSIX_Spinlock_Manager_initialization
- */
-static void _POSIX_Spinlock_Manager_initialization(void)
-{
-  _Objects_Initialize_information(
-    &_POSIX_Spinlock_Information,    /* object information table */
-    OBJECTS_POSIX_API,               /* object API */
-    OBJECTS_POSIX_SPINLOCKS,         /* object class */
-    Configuration_POSIX_API.maximum_spinlocks,
-                                     /* maximum objects of this class */
-    sizeof( POSIX_Spinlock_Control ),/* size of this object's control block */
-    true,                            /* true if the name is a string */
-    _POSIX_PATH_MAX,                 /* maximum length of each object's name */
-    NULL                             /* Proxy extraction support callout */
-  );
-}
-
-RTEMS_SYSINIT_ITEM(
-  _POSIX_Spinlock_Manager_initialization,
-  RTEMS_SYSINIT_POSIX_SPINLOCK,
-  RTEMS_SYSINIT_ORDER_MIDDLE
-);