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📄 apr.h.in(18.83 KB)
📄 apr.hnw(12.58 KB)
📄 apr.hw(17.64 KB)
📄 apr.hwc(17.6 KB)
📄 apr_allocator.h(6.07 KB)
📄 apr_atomic.h(6.04 KB)
📄 apr_cstr.h(11.13 KB)
📄 apr_dso.h(2.64 KB)
📄 apr_encode.h(23.97 KB)
📄 apr_env.h(2.06 KB)
📄 apr_errno.h(53.77 KB)
📄 apr_escape.h(17.23 KB)
📄 apr_file_info.h(17.17 KB)
📄 apr_file_io.h(42.13 KB)
📄 apr_fnmatch.h(6.08 KB)
📄 apr_general.h(7.12 KB)
📄 apr_getopt.h(5.84 KB)
📄 apr_global_mutex.h(7.19 KB)
📄 apr_hash.h(10.08 KB)
📄 apr_inherit.h(2.09 KB)
📄 apr_lib.h(8.23 KB)
📄 apr_mmap.h(5.01 KB)
📄 apr_network_io.h(36.01 KB)
📄 apr_perms_set.h(1.86 KB)
📄 apr_poll.h(20.6 KB)
📄 apr_pools.h(30.94 KB)
📄 apr_portable.h(20.02 KB)
📄 apr_proc_mutex.h(6.85 KB)
📄 apr_random.h(4.92 KB)
📄 apr_ring.h(18.57 KB)
📄 apr_shm.h(9.26 KB)
📄 apr_signal.h(2.7 KB)
📄 apr_skiplist.h(14.19 KB)
📄 apr_strings.h(14.55 KB)
📄 apr_support.h(1.6 KB)
📄 apr_tables.h(18.9 KB)
📄 apr_thread_cond.h(5.4 KB)
📄 apr_thread_mutex.h(4.39 KB)
📄 apr_thread_proc.h(35.28 KB)
📄 apr_thread_rwlock.h(4.65 KB)
📄 apr_time.h(7.39 KB)
📄 apr_user.h(5.19 KB)
📄 apr_version.h(5.28 KB)
📄 apr_want.h(2.89 KB)
📁 arch
📁 private

Editing: apr_atomic.h

/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef APR_ATOMIC_H
#define APR_ATOMIC_H

/**
 * @file apr_atomic.h
 * @brief APR Atomic Operations
 */

#include "apr.h"
#include "apr_pools.h"

#ifdef __cplusplus
extern "C" {
#endif

/**
 * @defgroup apr_atomic Atomic Operations
 * @ingroup APR 
 * @{
 */

/**
 * this function is required on some platforms to initialize the
 * atomic operation's internal structures
 * @param p pool
 * @return APR_SUCCESS on successful completion
 * @remark Programs do NOT need to call this directly. APR will call this
 *         automatically from apr_initialize().
 * @internal
 */
APR_DECLARE(apr_status_t) apr_atomic_init(apr_pool_t *p);

/*
 * Atomic operations on 32-bit values
 * Note: Each of these functions internally implements a memory barrier
 * on platforms that require it
 */

/**
 * atomically read an apr_uint32_t from memory
 * @param mem the pointer
 */
APR_DECLARE(apr_uint32_t) apr_atomic_read32(volatile apr_uint32_t *mem);

/**
 * atomically set an apr_uint32_t in memory
 * @param mem pointer to the object
 * @param val value that the object will assume
 */
APR_DECLARE(void) apr_atomic_set32(volatile apr_uint32_t *mem, apr_uint32_t val);

/**
 * atomically add 'val' to an apr_uint32_t
 * @param mem pointer to the object
 * @param val amount to add
 * @return old value pointed to by mem
 */
APR_DECLARE(apr_uint32_t) apr_atomic_add32(volatile apr_uint32_t *mem, apr_uint32_t val);

/**
 * atomically subtract 'val' from an apr_uint32_t
 * @param mem pointer to the object
 * @param val amount to subtract
 */
APR_DECLARE(void) apr_atomic_sub32(volatile apr_uint32_t *mem, apr_uint32_t val);

/**
 * atomically increment an apr_uint32_t by 1
 * @param mem pointer to the object
 * @return old value pointed to by mem
 */
APR_DECLARE(apr_uint32_t) apr_atomic_inc32(volatile apr_uint32_t *mem);

/**
 * atomically decrement an apr_uint32_t by 1
 * @param mem pointer to the atomic value
 * @return zero if the value becomes zero on decrement, otherwise non-zero
 */
APR_DECLARE(int) apr_atomic_dec32(volatile apr_uint32_t *mem);

/**
 * compare an apr_uint32_t's value with 'cmp'.
 * If they are the same swap the value with 'with'
 * @param mem pointer to the value
 * @param with what to swap it with
 * @param cmp the value to compare it to
 * @return the old value of *mem
 */
APR_DECLARE(apr_uint32_t) apr_atomic_cas32(volatile apr_uint32_t *mem, apr_uint32_t with,
                              apr_uint32_t cmp);

/**
 * exchange an apr_uint32_t's value with 'val'.
 * @param mem pointer to the value
 * @param val what to swap it with
 * @return the old value of *mem
 */
APR_DECLARE(apr_uint32_t) apr_atomic_xchg32(volatile apr_uint32_t *mem, apr_uint32_t val);

/*
 * Atomic operations on 64-bit values
 * Note: Each of these functions internally implements a memory barrier
 * on platforms that require it
 */

/**
 * atomically read an apr_uint64_t from memory
 * @param mem the pointer
 */
APR_DECLARE(apr_uint64_t) apr_atomic_read64(volatile apr_uint64_t *mem);

/**
 * atomically set an apr_uint64_t in memory
 * @param mem pointer to the object
 * @param val value that the object will assume
 */
APR_DECLARE(void) apr_atomic_set64(volatile apr_uint64_t *mem, apr_uint64_t val);

/**
 * atomically add 'val' to an apr_uint64_t
 * @param mem pointer to the object
 * @param val amount to add
 * @return old value pointed to by mem
 */
APR_DECLARE(apr_uint64_t) apr_atomic_add64(volatile apr_uint64_t *mem, apr_uint64_t val);

/**
 * atomically subtract 'val' from an apr_uint64_t
 * @param mem pointer to the object
 * @param val amount to subtract
 */
APR_DECLARE(void) apr_atomic_sub64(volatile apr_uint64_t *mem, apr_uint64_t val);

/**
 * atomically increment an apr_uint64_t by 1
 * @param mem pointer to the object
 * @return old value pointed to by mem
 */
APR_DECLARE(apr_uint64_t) apr_atomic_inc64(volatile apr_uint64_t *mem);

/**
 * atomically decrement an apr_uint64_t by 1
 * @param mem pointer to the atomic value
 * @return zero if the value becomes zero on decrement, otherwise non-zero
 */
APR_DECLARE(int) apr_atomic_dec64(volatile apr_uint64_t *mem);

/**
 * compare an apr_uint64_t's value with 'cmp'.
 * If they are the same swap the value with 'with'
 * @param mem pointer to the value
 * @param with what to swap it with
 * @param cmp the value to compare it to
 * @return the old value of *mem
 */
APR_DECLARE(apr_uint64_t) apr_atomic_cas64(volatile apr_uint64_t *mem, apr_uint64_t with,
                              apr_uint64_t cmp);

/**
 * exchange an apr_uint64_t's value with 'val'.
 * @param mem pointer to the value
 * @param val what to swap it with
 * @return the old value of *mem
 */
APR_DECLARE(apr_uint64_t) apr_atomic_xchg64(volatile apr_uint64_t *mem, apr_uint64_t val);

/**
 * compare the pointer's value with cmp.
 * If they are the same swap the value with 'with'
 * @param mem pointer to the pointer
 * @param with what to swap it with
 * @param cmp the value to compare it to
 * @return the old value of the pointer
 */
APR_DECLARE(void*) apr_atomic_casptr(volatile void **mem, void *with, const void *cmp);

/**
 * exchange a pair of pointer values
 * @param mem pointer to the pointer
 * @param with what to swap it with
 * @return the old value of the pointer
 */
APR_DECLARE(void*) apr_atomic_xchgptr(volatile void **mem, void *with);

/** @} */

#ifdef __cplusplus
}
#endif

#endif	/* !APR_ATOMIC_H */

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