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, 63 deletions

diff --git a/cpukit/posix/include/rtems/posix/spinlock.h b/cpukit/posix/include/rtems/posix/spinlock.h
deleted file mode 100644
index 8da451ce22..0000000000
--- a/cpukit/posix/include/rtems/posix/spinlock.h
+++ /dev/null
@@ -1,63 +0,0 @@
-/**
- * @file
- * 
- * @brief POSIX Spinlock Support
- *
- * This include file contains all the constants and structures associated
- * with the POSIX Spinlock Manager.
- *
- *  Directives provided are:
- *
- *   - create a spinlock
- *   - delete a spinlock
- *   - wait for a spinlock
- */
-
-/*
- *  COPYRIGHT (c) 1989-2011.
- *  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.
- */
-
-#ifndef _RTEMS_POSIX_SPINLOCK_H
-#define _RTEMS_POSIX_SPINLOCK_H
-
-#include <rtems/score/object.h>
-#include <rtems/score/corespinlock.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * @defgroup POSIX_SPINLOCK POSIX Spinlock Support
- *
- * @ingroup POSIXAPI
- *
- * @brief Constants and Structures Associated with the POSIX Spinlock Manager
- * 
- */
-/**@{**/
-
-/**
- * This type defines the control block used to manage each spinlock.
- */
-
-typedef struct {
-  /** This is used to manage a spinlock as an object. */
-  Objects_Control          Object;
-  /** This is used to implement the spinlock. */
-  CORE_spinlock_Control    Spinlock;
-}   POSIX_Spinlock_Control;
-
-/** @} */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
-/*  end of include file */