contrib/ofed/management/opensm/complib/cl_spinlock.c

   1 /*
   2  * Copyright (c) 2004, 2005 Voltaire, Inc. All rights reserved.
   3  * Copyright (c) 2002-2005 Mellanox Technologies LTD. All rights reserved.
   4  * Copyright (c) 1996-2003 Intel Corporation. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  *
  34  */
  35
  36 #if HAVE_CONFIG_H
  37 #  include <config.h>
  38 #endif                          /* HAVE_CONFIG_H */
  39
  40 #include <complib/cl_spinlock.h>
  41
  42 void cl_spinlock_construct(IN cl_spinlock_t * const p_spinlock)
  43 {
  44         CL_ASSERT(p_spinlock);
  45
  46         p_spinlock->state = CL_UNINITIALIZED;
  47 }
  48
  49 cl_status_t cl_spinlock_init(IN cl_spinlock_t * const p_spinlock)
  50 {
  51         CL_ASSERT(p_spinlock);
  52
  53         cl_spinlock_construct(p_spinlock);
  54
  55         /* Initialize with pthread_mutexattr_t = NULL */
  56         if (pthread_mutex_init(&p_spinlock->mutex, NULL))
  57                 return (CL_ERROR);
  58
  59         p_spinlock->state = CL_INITIALIZED;
  60         return (CL_SUCCESS);
  61 }
  62
  63 void cl_spinlock_destroy(IN cl_spinlock_t * const p_spinlock)
  64 {
  65         CL_ASSERT(p_spinlock);
  66         CL_ASSERT(cl_is_state_valid(p_spinlock->state));
  67
  68         if (p_spinlock->state == CL_INITIALIZED) {
  69                 p_spinlock->state = CL_UNINITIALIZED;
  70                 pthread_mutex_lock(&p_spinlock->mutex);
  71                 pthread_mutex_unlock(&p_spinlock->mutex);
  72                 pthread_mutex_destroy(&p_spinlock->mutex);
  73         }
  74         p_spinlock->state = CL_UNINITIALIZED;
  75 }
  76
  77 void cl_spinlock_acquire(IN cl_spinlock_t * const p_spinlock)
  78 {
  79         CL_ASSERT(p_spinlock);
  80         CL_ASSERT(p_spinlock->state == CL_INITIALIZED);
  81
  82         pthread_mutex_lock(&p_spinlock->mutex);
  83 }
  84
  85 void cl_spinlock_release(IN cl_spinlock_t * const p_spinlock)
  86 {
  87         CL_ASSERT(p_spinlock);
  88         CL_ASSERT(p_spinlock->state == CL_INITIALIZED);
  89
  90         pthread_mutex_unlock(&p_spinlock->mutex);
  91 }