mbed official / mbed-rtos

Official mbed Real Time Operating System based on the RTX implementation of the CMSIS-RTOS API open standard.

Dependents:   denki-yohou_b TestY201 Network-RTOS NTPClient_HelloWorld ... more

Deprecated

This is the mbed 2 rtos library. mbed OS 5 integrates the mbed library with mbed-rtos. With this, we have provided thread safety for all mbed APIs. If you'd like to learn about using mbed OS 5, please see the docs.

rtx/TARGET_CORTEX_M/rt_Memory.c@125:5713cbbdb706, 2017-07-04 (annotated)

Committer:
Kojto
Date:
Tue Jul 04 13:32:20 2017 +0100
Revision:
125:5713cbbdb706
Parent:
112:53ace74b190c 
replace mbed_rtx by mbed_rtx4



Not causing a conflict with mbed_rtx that is for newer rtos

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 112:53ace74b190c 1 /*----------------------------------------------------------------------------
mbed_official 112:53ace74b190c 2 * CMSIS-RTOS - RTX
mbed_official 112:53ace74b190c 3 *----------------------------------------------------------------------------
mbed_official 112:53ace74b190c 4 * Name: RT_MEMORY.C
mbed_official 112:53ace74b190c 5 * Purpose: Interface functions for Dynamic Memory Management System
mbed_official 112:53ace74b190c 6 * Rev.: V4.79
mbed_official 112:53ace74b190c 7 *----------------------------------------------------------------------------
mbed_official 112:53ace74b190c 8 *
mbed_official 112:53ace74b190c 9 * Copyright (c) 1999-2009 KEIL, 2009-2015 ARM Germany GmbH
mbed_official 112:53ace74b190c 10 * All rights reserved.
mbed_official 112:53ace74b190c 11 * Redistribution and use in source and binary forms, with or without
mbed_official 112:53ace74b190c 12 * modification, are permitted provided that the following conditions are met:
mbed_official 112:53ace74b190c 13 * - Redistributions of source code must retain the above copyright
mbed_official 112:53ace74b190c 14 * notice, this list of conditions and the following disclaimer.
mbed_official 112:53ace74b190c 15 * - Redistributions in binary form must reproduce the above copyright
mbed_official 112:53ace74b190c 16 * notice, this list of conditions and the following disclaimer in the
mbed_official 112:53ace74b190c 17 * documentation and/or other materials provided with the distribution.
mbed_official 112:53ace74b190c 18 * - Neither the name of ARM nor the names of its contributors may be used
mbed_official 112:53ace74b190c 19 * to endorse or promote products derived from this software without
mbed_official 112:53ace74b190c 20 * specific prior written permission.
mbed_official 112:53ace74b190c 21 *
mbed_official 112:53ace74b190c 22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 112:53ace74b190c 23 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 112:53ace74b190c 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
mbed_official 112:53ace74b190c 25 * ARE DISCLAIMED. IN NO EVENT SHALL COPYRIGHT HOLDERS AND CONTRIBUTORS BE
mbed_official 112:53ace74b190c 26 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
mbed_official 112:53ace74b190c 27 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
mbed_official 112:53ace74b190c 28 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
mbed_official 112:53ace74b190c 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
mbed_official 112:53ace74b190c 30 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
mbed_official 112:53ace74b190c 31 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
mbed_official 112:53ace74b190c 32 * POSSIBILITY OF SUCH DAMAGE.
mbed_official 112:53ace74b190c 33 *---------------------------------------------------------------------------*/
mbed_official 112:53ace74b190c 34
mbed_official 112:53ace74b190c 35 #include "rt_TypeDef.h"
mbed_official 112:53ace74b190c 36 #include "rt_Memory.h"
mbed_official 112:53ace74b190c 37
mbed_official 112:53ace74b190c 38
mbed_official 112:53ace74b190c 39 /* Functions */
mbed_official 112:53ace74b190c 40
mbed_official 112:53ace74b190c 41 // Initialize Dynamic Memory pool
mbed_official 112:53ace74b190c 42 // Parameters:
mbed_official 112:53ace74b190c 43 // pool: Pointer to memory pool
mbed_official 112:53ace74b190c 44 // size: Size of memory pool in bytes
mbed_official 112:53ace74b190c 45 // Return: 0 - OK, 1 - Error
mbed_official 112:53ace74b190c 46
mbed_official 112:53ace74b190c 47 U32 rt_init_mem (void *pool, U32 size) {
mbed_official 112:53ace74b190c 48 MEMP *ptr;
mbed_official 112:53ace74b190c 49
mbed_official 112:53ace74b190c 50 if ((pool == NULL) || (size < sizeof(MEMP))) { return (1U); }
mbed_official 112:53ace74b190c 51
mbed_official 112:53ace74b190c 52 ptr = (MEMP *)pool;
mbed_official 112:53ace74b190c 53 ptr->next = (MEMP *)((U32)pool + size - sizeof(MEMP *));
mbed_official 112:53ace74b190c 54 ptr->next->next = NULL;
mbed_official 112:53ace74b190c 55 ptr->len = 0U;
mbed_official 112:53ace74b190c 56
mbed_official 112:53ace74b190c 57 return (0U);
mbed_official 112:53ace74b190c 58 }
mbed_official 112:53ace74b190c 59
mbed_official 112:53ace74b190c 60 // Allocate Memory from Memory pool
mbed_official 112:53ace74b190c 61 // Parameters:
mbed_official 112:53ace74b190c 62 // pool: Pointer to memory pool
mbed_official 112:53ace74b190c 63 // size: Size of memory in bytes to allocate
mbed_official 112:53ace74b190c 64 // Return: Pointer to allocated memory
mbed_official 112:53ace74b190c 65
mbed_official 112:53ace74b190c 66 void *rt_alloc_mem (void *pool, U32 size) {
mbed_official 112:53ace74b190c 67 MEMP *p, *p_search, *p_new;
mbed_official 112:53ace74b190c 68 U32 hole_size;
mbed_official 112:53ace74b190c 69
mbed_official 112:53ace74b190c 70 if ((pool == NULL) || (size == 0U)) { return NULL; }
mbed_official 112:53ace74b190c 71
mbed_official 112:53ace74b190c 72 /* Add header offset to 'size' */
mbed_official 112:53ace74b190c 73 size += sizeof(MEMP);
mbed_official 112:53ace74b190c 74 /* Make sure that block is 4-byte aligned */
mbed_official 112:53ace74b190c 75 size = (size + 3U) & ~(U32)3U;
mbed_official 112:53ace74b190c 76
mbed_official 112:53ace74b190c 77 p_search = (MEMP *)pool;
mbed_official 112:53ace74b190c 78 while (1) {
mbed_official 112:53ace74b190c 79 hole_size = (U32)p_search->next - (U32)p_search;
mbed_official 112:53ace74b190c 80 hole_size -= p_search->len;
mbed_official 112:53ace74b190c 81 /* Check if hole size is big enough */
mbed_official 112:53ace74b190c 82 if (hole_size >= size) { break; }
mbed_official 112:53ace74b190c 83 p_search = p_search->next;
mbed_official 112:53ace74b190c 84 if (p_search->next == NULL) {
mbed_official 112:53ace74b190c 85 /* Failed, we are at the end of the list */
mbed_official 112:53ace74b190c 86 return NULL;
mbed_official 112:53ace74b190c 87 }
mbed_official 112:53ace74b190c 88 }
mbed_official 112:53ace74b190c 89
mbed_official 112:53ace74b190c 90 if (p_search->len == 0U) {
mbed_official 112:53ace74b190c 91 /* No block is allocated, set the Length of the first element */
mbed_official 112:53ace74b190c 92 p_search->len = size;
mbed_official 112:53ace74b190c 93 p = (MEMP *)(((U32)p_search) + sizeof(MEMP));
mbed_official 112:53ace74b190c 94 } else {
mbed_official 112:53ace74b190c 95 /* Insert new list element into the memory list */
mbed_official 112:53ace74b190c 96 p_new = (MEMP *)((U32)p_search + p_search->len);
mbed_official 112:53ace74b190c 97 p_new->next = p_search->next;
mbed_official 112:53ace74b190c 98 p_new->len = size;
mbed_official 112:53ace74b190c 99 p_search->next = p_new;
mbed_official 112:53ace74b190c 100 p = (MEMP *)(((U32)p_new) + sizeof(MEMP));
mbed_official 112:53ace74b190c 101 }
mbed_official 112:53ace74b190c 102
mbed_official 112:53ace74b190c 103 return (p);
mbed_official 112:53ace74b190c 104 }
mbed_official 112:53ace74b190c 105
mbed_official 112:53ace74b190c 106 // Free Memory and return it to Memory pool
mbed_official 112:53ace74b190c 107 // Parameters:
mbed_official 112:53ace74b190c 108 // pool: Pointer to memory pool
mbed_official 112:53ace74b190c 109 // mem: Pointer to memory to free
mbed_official 112:53ace74b190c 110 // Return: 0 - OK, 1 - Error
mbed_official 112:53ace74b190c 111
mbed_official 112:53ace74b190c 112 U32 rt_free_mem (void *pool, void *mem) {
mbed_official 112:53ace74b190c 113 MEMP *p_search, *p_prev, *p_return;
mbed_official 112:53ace74b190c 114
mbed_official 112:53ace74b190c 115 if ((pool == NULL) || (mem == NULL)) { return (1U); }
mbed_official 112:53ace74b190c 116
mbed_official 112:53ace74b190c 117 p_return = (MEMP *)((U32)mem - sizeof(MEMP));
mbed_official 112:53ace74b190c 118
mbed_official 112:53ace74b190c 119 /* Set list header */
mbed_official 112:53ace74b190c 120 p_prev = NULL;
mbed_official 112:53ace74b190c 121 p_search = (MEMP *)pool;
mbed_official 112:53ace74b190c 122 while (p_search != p_return) {
mbed_official 112:53ace74b190c 123 p_prev = p_search;
mbed_official 112:53ace74b190c 124 p_search = p_search->next;
mbed_official 112:53ace74b190c 125 if (p_search == NULL) {
mbed_official 112:53ace74b190c 126 /* Valid Memory block not found */
mbed_official 112:53ace74b190c 127 return (1U);
mbed_official 112:53ace74b190c 128 }
mbed_official 112:53ace74b190c 129 }
mbed_official 112:53ace74b190c 130
mbed_official 112:53ace74b190c 131 if (p_prev == NULL) {
mbed_official 112:53ace74b190c 132 /* First block to be released, only set length to 0 */
mbed_official 112:53ace74b190c 133 p_search->len = 0U;
mbed_official 112:53ace74b190c 134 } else {
mbed_official 112:53ace74b190c 135 /* Discard block from chain list */
mbed_official 112:53ace74b190c 136 p_prev->next = p_search->next;
mbed_official 112:53ace74b190c 137 }
mbed_official 112:53ace74b190c 138
mbed_official 112:53ace74b190c 139 return (0U);
mbed_official 112:53ace74b190c 140 }