shared_mutex.c 4.39 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
/*
 * Copyright (c) 2014-2015, Siemens AG. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

27
#include <embb/base/c/mutex.h>
28 29 30 31 32 33
#include <assert.h>

#include <embb/base/c/internal/unused.h>

#ifdef EMBB_PLATFORM_THREADING_WINTHREADS

34 35
int embb_shared_mutex_init(embb_shared_mutex_t* shared_mutex) {
  InitializeSRWLock(shared_mutex);
36 37 38
  return EMBB_SUCCESS;
}

39 40
int embb_shared_mutex_lock(embb_shared_mutex_t* shared_mutex) {
  AcquireSRWLockExclusive(shared_mutex);
41 42 43
  return EMBB_SUCCESS;
}

44 45 46 47
int embb_shared_mutex_try_lock(embb_shared_mutex_t* shared_mutex) {
  BOOLEAN success;
  success = TryAcquireSRWLockExclusive(shared_mutex);
  if (success == FALSE) return EMBB_ERROR;
48 49 50
  return EMBB_SUCCESS;
}

51 52
int embb_shared_mutex_unlock(embb_shared_mutex_t* shared_mutex) {
  ReleaseSRWLockExclusive(shared_mutex);
53 54 55
  return EMBB_SUCCESS;
}

56 57
int embb_shared_mutex_lock_shared(embb_shared_mutex_t* shared_mutex) {
  AcquireSRWLockShared(shared_mutex);
58 59 60
  return EMBB_SUCCESS;
}

61 62 63 64
int embb_shared_mutex_try_lock_shared(embb_shared_mutex_t* shared_mutex) {
  BOOLEAN success;
  success = TryAcquireSRWLockShared(shared_mutex);
  if (success == FALSE) return EMBB_ERROR;
65 66 67
  return EMBB_SUCCESS;
}

68 69
int embb_shared_mutex_unlock_shared(embb_shared_mutex_t* shared_mutex) {
  ReleaseSRWLockShared(shared_mutex);
70 71 72
  return EMBB_SUCCESS;
}

73
void embb_shared_mutex_destroy(embb_shared_mutex_t* shared_mutex) {
74
  // Quoting MSDN: "SRW locks do not need to be explicitly destroyed".
75
  EMBB_UNUSED(shared_mutex);
76 77 78 79 80 81
}

#endif /* EMBB_PLATFORM_THREADING_WINTHREADS */

#ifdef EMBB_PLATFORM_THREADING_POSIXTHREADS

82 83
int embb_shared_mutex_init(embb_shared_mutex_t* shared_mutex) {
  int result = pthread_rwlock_init(shared_mutex, NULL);
84 85 86 87 88 89
  if (result != 0) {
    return EMBB_ERROR;
  }
  return EMBB_SUCCESS;
}

90 91
int embb_shared_mutex_lock(embb_shared_mutex_t* shared_mutex) {
  int result = pthread_rwlock_wrlock(shared_mutex);
92 93 94 95 96 97
  if (result != 0) {
    return EMBB_ERROR;
  }
  return EMBB_SUCCESS;
}

98 99
int embb_shared_mutex_try_lock(embb_shared_mutex_t* shared_mutex) {
  int result = pthread_rwlock_trywrlock(shared_mutex);
100 101 102 103 104 105 106 107 108
  if (result == 0) {
    return EMBB_SUCCESS;
  }
  if (result == EBUSY) {
    return EMBB_BUSY;
  }
  return EMBB_ERROR;
}

109 110 111 112
int embb_shared_mutex_unlock(embb_shared_mutex_t* shared_mutex) {
  int result = pthread_rwlock_unlock(shared_mutex);
  if (result != 0) {
    return EMBB_ERROR;
113
  }
114
  return EMBB_SUCCESS;
115 116
}

117 118
int embb_shared_mutex_lock_shared(embb_shared_mutex_t* shared_mutex) {
  int result = pthread_rwlock_rdlock(shared_mutex);
119 120 121 122 123 124
  if (result != 0) {
    return EMBB_ERROR;
  }
  return EMBB_SUCCESS;
}

125 126 127 128 129 130 131 132 133 134 135 136 137
int embb_shared_mutex_try_lock_shared(embb_shared_mutex_t* shared_mutex) {
  int result = pthread_rwlock_tryrdlock(shared_mutex);
  if (result == 0) {
    return EMBB_SUCCESS;
  }
  if (result == EBUSY) {
    return EMBB_BUSY;
  }
  return EMBB_ERROR;
}

int embb_shared_mutex_unlock_shared(embb_shared_mutex_t* shared_mutex) {
  int result = pthread_rwlock_unlock(shared_mutex);
138 139 140 141 142 143
  if (result != 0) {
    return EMBB_ERROR;
  }
  return EMBB_SUCCESS;
}

144 145
void embb_shared_mutex_destroy(embb_shared_mutex_t* shared_mutex) {
  pthread_rwlock_destroy(shared_mutex);
146 147 148
}

#endif /* EMBB_PLATFORM_THREADING_POSIXTHREADS */