posix/src/pspinunlock.c

0001 /* SPDX-License-Identifier: BSD-2-Clause */
0002
0003 /**
0004  * @file
0005  *
0006  * @ingroup POSIXAPI
0007  *
0008  * @brief Function Unlocks a Spin Lock Object
0009  */
0010
0011 /*
0012  *  POSIX Spinlock Manager -- Wait at a Spinlock
0013  *
0014  *  COPYRIGHT (c) 1989-2007.
0015  *  On-Line Applications Research Corporation (OAR).
0016  *
0017  *  Copyright (c) 2016 embedded brains GmbH & Co. KG
0018  *
0019  * Redistribution and use in source and binary forms, with or without
0020  * modification, are permitted provided that the following conditions
0021  * are met:
0022  * 1. Redistributions of source code must retain the above copyright
0023  *    notice, this list of conditions and the following disclaimer.
0024  * 2. Redistributions in binary form must reproduce the above copyright
0025  *    notice, this list of conditions and the following disclaimer in the
0026  *    documentation and/or other materials provided with the distribution.
0027  *
0028  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
0029  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
0030  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
0031  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
0032  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
0033  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
0034  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0035  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0036  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
0037  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
0038  * POSSIBILITY OF SUCH DAMAGE.
0039  */
0040
0041 #ifdef HAVE_CONFIG_H
0042 #include "config.h"
0043 #endif
0044
0045 #include <rtems/posix/spinlockimpl.h>
0046
0047 int pthread_spin_unlock( pthread_spinlock_t *lock )
0048 {
0049   POSIX_Spinlock_Control *the_spinlock;
0050   ISR_Level               level;
0051 #if defined(RTEMS_SMP) && defined(RTEMS_PROFILING)
0052   SMP_lock_Stats          unused_stats;
0053   SMP_lock_Stats_context  unused_context;
0054 #endif
0055
0056   the_spinlock = _POSIX_Spinlock_Get( lock );
0057   level = the_spinlock->interrupt_state;
0058 #if defined(RTEMS_SMP)
0059 #if defined(RTEMS_PROFILING)
0060   /* This is a hack to get around the lock profiling statistics */
0061   unused_stats.total_section_time = 0;
0062   unused_stats.max_section_time = UINT32_MAX;
0063   unused_context.stats = &unused_stats;
0064   unused_context.acquire_instant = 0;
0065 #endif
0066   _SMP_ticket_lock_Release(
0067     &the_spinlock->Lock,
0068     &unused_context
0069   );
0070 #endif
0071   _ISR_Local_enable( level );
0072   return 0;
0073 }