tmk_core/tool/mbed/mbed-sdk/libraries/rtos/rtos/Mail.h

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