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/**
* @brief Atomically set a bit.
*
* Atomically set bit number @a bit of @a target.
* The target may be a single atomic variable or an array of them.
*
* @param target Address of atomic variable or array.
* @param bit Bit number (starting from 0).
*
* @return N/A
*/
/*
* SPDX-FileCopyrightText: 2016 Intel Corporation
* SPDX-FileCopyrightText: 2011-2014 Wind River Systems, Inc.
* SPDX-FileContributor: 2018-2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "mesh/atomic.h"
#include "mesh/mutex.h"
#ifndef CONFIG_ATOMIC_OPERATIONS_BUILTIN
/**
*
* @brief Atomic get primitive
*
* @param target memory location to read from
*
* This routine provides the atomic get primitive to atomically read
* a value from <target>. It simply does an ordinary load. Note that <target>
* is expected to be aligned to a 4-byte boundary.
*
* @return The value read from <target>
*/
bt_mesh_atomic_val_t bt_mesh_atomic_get(const bt_mesh_atomic_t *target)
{
return *target;
}
/**
*
* @brief Atomic get-and-set primitive
*
* This routine provides the atomic set operator. The <value> is atomically
* written at <target> and the previous value at <target> is returned.
*
* @param target the memory location to write to
* @param value the value to write
*
* @return The previous value from <target>
*/
bt_mesh_atomic_val_t bt_mesh_atomic_set(bt_mesh_atomic_t *target, bt_mesh_atomic_val_t value)
{
bt_mesh_atomic_val_t ret = 0;
bt_mesh_atomic_lock();
ret = *target;
*target = value;
bt_mesh_atomic_unlock();
return ret;
}
/**
*
* @brief Atomic bitwise inclusive OR primitive
*
* This routine provides the atomic bitwise inclusive OR operator. The <value>
* is atomically bitwise OR'ed with the value at <target>, placing the result
* at <target>, and the previous value at <target> is returned.
*
* @param target the memory location to be modified
* @param value the value to OR
*
* @return The previous value from <target>
*/
bt_mesh_atomic_val_t bt_mesh_atomic_or(bt_mesh_atomic_t *target, bt_mesh_atomic_val_t value)
{
bt_mesh_atomic_val_t ret = 0;
bt_mesh_atomic_lock();
ret = *target;
*target |= value;
bt_mesh_atomic_unlock();
return ret;
}
/**
*
* @brief Atomic bitwise AND primitive
*
* This routine provides the atomic bitwise AND operator. The <value> is
* atomically bitwise AND'ed with the value at <target>, placing the result
* at <target>, and the previous value at <target> is returned.
*
* @param target the memory location to be modified
* @param value the value to AND
*
* @return The previous value from <target>
*/
bt_mesh_atomic_val_t bt_mesh_atomic_and(bt_mesh_atomic_t *target, bt_mesh_atomic_val_t value)
{
bt_mesh_atomic_val_t ret = 0;
bt_mesh_atomic_lock();
ret = *target;
*target &= value;
bt_mesh_atomic_unlock();
return ret;
}
/**
*
* @brief Atomic decrement primitive
*
* @param target memory location to decrement
*
* This routine provides the atomic decrement operator. The value at <target>
* is atomically decremented by 1, and the old value from <target> is returned.
*
* @return The value from <target> prior to the decrement
*/
bt_mesh_atomic_val_t bt_mesh_atomic_dec(bt_mesh_atomic_t *target)
{
bt_mesh_atomic_val_t ret = 0;
bt_mesh_atomic_lock();
ret = *target;
(*target)--;
bt_mesh_atomic_unlock();
return ret;
}
/**
*
* @brief Atomic increment primitive
*
* @param target memory location to increment
*
* This routine provides the atomic increment operator. The value at <target>
* is atomically incremented by 1, and the old value from <target> is returned.
*
* @return The value from <target> before the increment
*/
bt_mesh_atomic_val_t bt_mesh_atomic_inc(bt_mesh_atomic_t *target)
{
bt_mesh_atomic_val_t ret = 0;
bt_mesh_atomic_lock();
ret = *target;
(*target)++;
bt_mesh_atomic_unlock();
return ret;
}
bool bt_mesh_atomic_cas(bt_mesh_atomic_t *target, bt_mesh_atomic_val_t excepted, bt_mesh_atomic_val_t new_val)
{
bt_mesh_atomic_lock();
if (*target == excepted) {
*target = new_val;
bt_mesh_atomic_unlock();
return true;
}
bt_mesh_atomic_unlock();
return false;
}
#endif /* #ifndef CONFIG_ATOMIC_OPERATIONS_BUILTIN */
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