Diff: TARGET_MCU_NRF51822/sdk/source/ble/peer_manager/pm_mutex.c

Revision:

640:c90ae1400bf2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TARGET_MCU_NRF51822/sdk/source/ble/peer_manager/pm_mutex.c	Wed Sep 14 14:39:43 2016 +0100
@@ -0,0 +1,135 @@
+/*
+ * Copyright (c) Nordic Semiconductor ASA
+ * 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.
+ *
+ *   3. Neither the name of Nordic Semiconductor ASA nor the names of other
+ *   contributors to this software may be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ *
+ * 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.
+ *
+ */
+
+
+#include "pm_mutex.h"
+
+#include <stdbool.h>
+#include <string.h>
+#include "nrf_error.h"
+#include "app_util_platform.h"
+
+
+
+/**@brief Locks the mutex defined by the mask.
+ *
+ * @param p_mutex pointer to the mutex storage.
+ * @param mutex_mask the mask identifying the mutex position.
+ *
+ * @retval true if the mutex could be locked.
+ * @retval false if the mutex was already locked.
+ */
+static bool lock_by_mask(uint8_t * p_mutex, uint8_t mutex_mask)
+{
+    bool success = false;
+
+    if ( (*p_mutex & mutex_mask) == 0 )
+    {
+        CRITICAL_REGION_ENTER();
+        if ( (*p_mutex & mutex_mask) == 0 )
+        {
+            *p_mutex |= mutex_mask;
+
+            success = true;
+        }
+        CRITICAL_REGION_EXIT();
+    }
+
+    return ( success );
+}
+
+
+void pm_mutex_init(uint8_t * p_mutex, uint16_t mutex_size)
+{
+    if (p_mutex != NULL)
+    {
+        memset(&p_mutex[0], 0, MUTEX_STORAGE_SIZE(mutex_size));
+    }
+}
+
+
+bool pm_mutex_lock(uint8_t * p_mutex, uint16_t mutex_id)
+{
+    if (p_mutex != NULL)
+    {
+        return ( lock_by_mask(&(p_mutex[mutex_id >> 3]), (1 << (mutex_id & 0x07))) );
+    }
+    else
+    {
+        return false;
+    }
+}
+
+
+void pm_mutex_unlock(uint8_t * p_mutex, uint16_t mutex_id)
+{
+    uint8_t mutex_base = mutex_id >> 3;
+    uint8_t mutex_mask = (1 << (mutex_id & 0x07));
+
+    if   ((p_mutex != NULL)
+       && (p_mutex[mutex_base] & mutex_mask))
+    {
+        CRITICAL_REGION_ENTER();
+        p_mutex[mutex_base] &= ~mutex_mask;
+        CRITICAL_REGION_EXIT();
+    }
+}
+
+
+uint16_t pm_mutex_lock_first_available(uint8_t * p_mutex, uint16_t mutex_size)
+{
+    if (p_mutex != NULL)
+    {
+        for ( uint16_t i = 0; i < mutex_size; i++ )
+        {
+            if ( lock_by_mask(&(p_mutex[i >> 3]), 1 << (i & 0x07)) )
+            {
+                return ( i );
+            }
+        }
+    }
+
+    return ( mutex_size );
+}
+
+
+bool pm_mutex_lock_status_get(uint8_t * p_mutex, uint16_t mutex_id)
+{
+    if (p_mutex != NULL)
+    {
+        return ( (p_mutex[mutex_id >> 3] & (1 << (mutex_id & 0x07))) );
+    }
+    else
+    {
+        return true;
+    }
+}