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, 77 deletions

diff --git a/cpukit/score/include/rtems/score/corespinlock.h b/cpukit/score/include/rtems/score/corespinlock.h
deleted file mode 100644
index 1666538bf6..0000000000
--- a/cpukit/score/include/rtems/score/corespinlock.h
+++ /dev/null
@@ -1,77 +0,0 @@
-/**
- *  @file  rtems/score/corespinlock.h
- *
- *  @brief Constants and Structures Associated with the Spinlock Handler
- *
- *  This include file contains all the constants and structures associated
- *  with the Spinlock Handler.
- */
-
-/*
- *  COPYRIGHT (c) 1989-2006.
- *  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_SCORE_CORESPINLOCK_H
-#define _RTEMS_SCORE_CORESPINLOCK_H
-
-#include <rtems/score/isrlock.h>
-#include <rtems/score/thread.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- *  @defgroup ScoreSpinlock Spinlock Handler
- *
- *  @ingroup Score
- *
- *  This handler encapsulates functionality which provides the foundation
- *  Spinlock services used in all of the APIs supported by RTEMS.
- */
-/**@{*/
-
-/**
- *  The following defines the control block used to manage each
- *  spinlock.
- */
-typedef struct {
-  /**
-   * @brief Lock to protect the other fields.
-   *
-   * This implementation is a bit stupid.  However, test cases in the Linux
-   * Test Project do things like sleep() and printf() while owning a
-   * pthread_spinlock_t, e.g.
-   * testcases/open_posix_testsuite/conformance/interfaces/pthread_spin_lock/1-2.c
-   */
-  ISR_LOCK_MEMBER( Lock )
-
-  /** This field is the lock.
-   */
-  uint32_t lock;
-
-  /** This field is a count of the current number of threads using
-   *  this spinlock.  It includes the thread holding the lock as well
-   *  as those waiting.
-   */
-  uint32_t users;
-
-  /** This field is the Id of the thread holding the lock.  It may or may
-   *  not be the thread which acquired it.
-   */
-  Thread_Control *holder;
-}   CORE_spinlock_Control;
-
-/**@}*/
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
-/*  end of include file */