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mbed-rtos/rtos/Mail.h@0:d6c9b09b4042, 2020-12-02 (annotated)

Committer:
annieluo2
Date:
Wed Dec 02 18:02:03 2020 +0000
Revision:
0:d6c9b09b4042
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annieluo2 0:d6c9b09b4042 1 /* mbed Microcontroller Library
annieluo2 0:d6c9b09b4042 2 * Copyright (c) 2006-2012 ARM Limited
annieluo2 0:d6c9b09b4042 3 *
annieluo2 0:d6c9b09b4042 4 * Permission is hereby granted, free of charge, to any person obtaining a copy
annieluo2 0:d6c9b09b4042 5 * of this software and associated documentation files (the "Software"), to deal
annieluo2 0:d6c9b09b4042 6 * in the Software without restriction, including without limitation the rights
annieluo2 0:d6c9b09b4042 7 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
annieluo2 0:d6c9b09b4042 8 * copies of the Software, and to permit persons to whom the Software is
annieluo2 0:d6c9b09b4042 9 * furnished to do so, subject to the following conditions:
annieluo2 0:d6c9b09b4042 10 *
annieluo2 0:d6c9b09b4042 11 * The above copyright notice and this permission notice shall be included in
annieluo2 0:d6c9b09b4042 12 * all copies or substantial portions of the Software.
annieluo2 0:d6c9b09b4042 13 *
annieluo2 0:d6c9b09b4042 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
annieluo2 0:d6c9b09b4042 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
annieluo2 0:d6c9b09b4042 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
annieluo2 0:d6c9b09b4042 17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
annieluo2 0:d6c9b09b4042 18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
annieluo2 0:d6c9b09b4042 19 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
annieluo2 0:d6c9b09b4042 20 * SOFTWARE.
annieluo2 0:d6c9b09b4042 21 */
annieluo2 0:d6c9b09b4042 22 #ifndef MAIL_H
annieluo2 0:d6c9b09b4042 23 #define MAIL_H
annieluo2 0:d6c9b09b4042 24
annieluo2 0:d6c9b09b4042 25 #include <stdint.h>
annieluo2 0:d6c9b09b4042 26 #include <string.h>
annieluo2 0:d6c9b09b4042 27
annieluo2 0:d6c9b09b4042 28 #include "cmsis_os.h"
annieluo2 0:d6c9b09b4042 29
annieluo2 0:d6c9b09b4042 30 namespace rtos {
annieluo2 0:d6c9b09b4042 31 /** \addtogroup rtos */
annieluo2 0:d6c9b09b4042 32 /** @{*/
annieluo2 0:d6c9b09b4042 33
annieluo2 0:d6c9b09b4042 34 /** The Mail class allow to control, send, receive, or wait for mail.
annieluo2 0:d6c9b09b4042 35 A mail is a memory block that is send to a thread or interrupt service routine.
annieluo2 0:d6c9b09b4042 36 @tparam T data type of a single message element.
annieluo2 0:d6c9b09b4042 37 @tparam queue_sz maximum number of messages in queue.
annieluo2 0:d6c9b09b4042 38 */
annieluo2 0:d6c9b09b4042 39 template<typename T, uint32_t queue_sz>
annieluo2 0:d6c9b09b4042 40 class Mail {
annieluo2 0:d6c9b09b4042 41 public:
annieluo2 0:d6c9b09b4042 42 /** Create and Initialise Mail queue. */
annieluo2 0:d6c9b09b4042 43 Mail() {
annieluo2 0:d6c9b09b4042 44 #ifdef CMSIS_OS_RTX
annieluo2 0:d6c9b09b4042 45 memset(_mail_q, 0, sizeof(_mail_q));
annieluo2 0:d6c9b09b4042 46 _mail_p[0] = _mail_q;
annieluo2 0:d6c9b09b4042 47
annieluo2 0:d6c9b09b4042 48 memset(_mail_m, 0, sizeof(_mail_m));
annieluo2 0:d6c9b09b4042 49 _mail_p[1] = _mail_m;
annieluo2 0:d6c9b09b4042 50
annieluo2 0:d6c9b09b4042 51 _mail_def.pool = _mail_p;
annieluo2 0:d6c9b09b4042 52 _mail_def.queue_sz = queue_sz;
annieluo2 0:d6c9b09b4042 53 _mail_def.item_sz = sizeof(T);
annieluo2 0:d6c9b09b4042 54 #endif
annieluo2 0:d6c9b09b4042 55 _mail_id = osMailCreate(&_mail_def, NULL);
annieluo2 0:d6c9b09b4042 56 }
annieluo2 0:d6c9b09b4042 57
annieluo2 0:d6c9b09b4042 58 /** Allocate a memory block of type T
annieluo2 0:d6c9b09b4042 59 @param millisec timeout value or 0 in case of no time-out. (default: 0).
annieluo2 0:d6c9b09b4042 60 @return pointer to memory block that can be filled with mail or NULL in case error.
annieluo2 0:d6c9b09b4042 61 */
annieluo2 0:d6c9b09b4042 62 T* alloc(uint32_t millisec=0) {
annieluo2 0:d6c9b09b4042 63 return (T*)osMailAlloc(_mail_id, millisec);
annieluo2 0:d6c9b09b4042 64 }
annieluo2 0:d6c9b09b4042 65
annieluo2 0:d6c9b09b4042 66 /** Allocate a memory block of type T and set memory block to zero.
annieluo2 0:d6c9b09b4042 67 @param millisec timeout value or 0 in case of no time-out. (default: 0).
annieluo2 0:d6c9b09b4042 68 @return pointer to memory block that can be filled with mail or NULL in case error.
annieluo2 0:d6c9b09b4042 69 */
annieluo2 0:d6c9b09b4042 70 T* calloc(uint32_t millisec=0) {
annieluo2 0:d6c9b09b4042 71 return (T*)osMailCAlloc(_mail_id, millisec);
annieluo2 0:d6c9b09b4042 72 }
annieluo2 0:d6c9b09b4042 73
annieluo2 0:d6c9b09b4042 74 /** Put a mail in the queue.
annieluo2 0:d6c9b09b4042 75 @param mptr memory block previously allocated with Mail::alloc or Mail::calloc.
annieluo2 0:d6c9b09b4042 76 @return status code that indicates the execution status of the function.
annieluo2 0:d6c9b09b4042 77 */
annieluo2 0:d6c9b09b4042 78 osStatus put(T *mptr) {
annieluo2 0:d6c9b09b4042 79 return osMailPut(_mail_id, (void*)mptr);
annieluo2 0:d6c9b09b4042 80 }
annieluo2 0:d6c9b09b4042 81
annieluo2 0:d6c9b09b4042 82 /** Get a mail from a queue.
annieluo2 0:d6c9b09b4042 83 @param millisec timeout value or 0 in case of no time-out. (default: osWaitForever).
annieluo2 0:d6c9b09b4042 84 @return event that contains mail information or error code.
annieluo2 0:d6c9b09b4042 85 */
annieluo2 0:d6c9b09b4042 86 osEvent get(uint32_t millisec=osWaitForever) {
annieluo2 0:d6c9b09b4042 87 return osMailGet(_mail_id, millisec);
annieluo2 0:d6c9b09b4042 88 }
annieluo2 0:d6c9b09b4042 89
annieluo2 0:d6c9b09b4042 90 /** Free a memory block from a mail.
annieluo2 0:d6c9b09b4042 91 @param mptr pointer to the memory block that was obtained with Mail::get.
annieluo2 0:d6c9b09b4042 92 @return status code that indicates the execution status of the function.
annieluo2 0:d6c9b09b4042 93 */
annieluo2 0:d6c9b09b4042 94 osStatus free(T *mptr) {
annieluo2 0:d6c9b09b4042 95 return osMailFree(_mail_id, (void*)mptr);
annieluo2 0:d6c9b09b4042 96 }
annieluo2 0:d6c9b09b4042 97
annieluo2 0:d6c9b09b4042 98 private:
annieluo2 0:d6c9b09b4042 99 osMailQId _mail_id;
annieluo2 0:d6c9b09b4042 100 osMailQDef_t _mail_def;
annieluo2 0:d6c9b09b4042 101 #ifdef CMSIS_OS_RTX
annieluo2 0:d6c9b09b4042 102 uint32_t _mail_q[4+(queue_sz)];
annieluo2 0:d6c9b09b4042 103 uint32_t _mail_m[3+((sizeof(T)+3)/4)*(queue_sz)];
annieluo2 0:d6c9b09b4042 104 void *_mail_p[2];
annieluo2 0:d6c9b09b4042 105 #endif
annieluo2 0:d6c9b09b4042 106 };
annieluo2 0:d6c9b09b4042 107
annieluo2 0:d6c9b09b4042 108 }
annieluo2 0:d6c9b09b4042 109
annieluo2 0:d6c9b09b4042 110 #endif
annieluo2 0:d6c9b09b4042 111
annieluo2 0:d6c9b09b4042 112
annieluo2 0:d6c9b09b4042 113 /** @}*/