rt-thread/components/CMSIS/RTOS/cmsis_os.h

/* ----------------------------------------------------------------------  
 * Copyright (C) 2012 ARM Limited. All rights reserved.  
 *  
 * $Date:        5. March 2012
 * $Revision:    V0.03
 *  
 * Project:      CMSIS-RTOS API
 * Title:        cmsis_os.h RT-Thread header file
 *  
 * Version 0.02
 *    Initial Proposal Phase 
 * Version 0.03
 *    osKernelStart added, optional feature: main started as thread
 *    osSemaphores have standard behaviour
 *    osTimerCreate does not start the timer, added osTimerStart
 *    osThreadPass is renamed to osThreadYield 
 * -------------------------------------------------------------------- */ 

/**
\page cmsis_os_h Header File Template: cmsis_os.h

The file \b cmsis_os.h is a template header file for a CMSIS-RTOS compliant Real-Time Operating System (RTOS).
Each RTOS that is compliant with CMSIS-RTOS shall provide a specific \b cmsis_os.h header file that represents
its implementation.

The file cmsis_os.h contains:
 - CMSIS-RTOS API function definitions
 - struct definitions for parameters and return types
 - status and priority values used by CMSIS-RTOS API functions
 - macros for defining threads and other kernel objects


<b>Name conventions and header file modifications</b>

All definitions are prefixed with \b os to give an unique name space for CMSIS-RTOS functions.
Definitions that are prefixed \b os_ are not used in the application code but local to this header file.
All definitions and functions that belong to a module are grouped and have a common prefix, i.e. \b osThread.
 
Definitions that are marked with <b>CAN BE CHANGED</b> can be adapted towards the needs of the actual CMSIS-RTOS implementation. 
These definitions can be specific to the underlying RTOS kernel.

Definitions that are marked with <b>MUST REMAIN UNCHANGED</b> cannot be altered. Otherwise the CMSIS-RTOS implementation is no longer
compliant to the standard. Note that some functions are optional and need not to be provided by every CMSIS-RTOS implementation.


<b>Function calls from interrupt service routines</b>

The following CMSIS-RTOS functions can be called from threads and interrupt service routines (ISR):
  - \ref osSignalSet
  - \ref osSemaphoreRelease
  - \ref osPoolAlloc, \ref osPoolCAlloc, \ref osPoolFree
  - \ref osMessagePut, \ref osMessageGet
  - \ref osMailAlloc, \ref osMailCAlloc, \ref osMailGet, \ref osMailPut, \ref osMailFree

Functions that cannot be called from an ISR are verifying the interrupt status and return in case that they are called 
from an ISR context the status code \b osErrorISR. In some implementations this condition might be caught using the HARD FAULT vector.

Some CMSIS-RTOS implementations support CMSIS-RTOS function calls from multiple ISR at the same time.
If this is impossible, the CMSIS-RTOS rejects calls by nested ISR functions with the status code \b osErrorISRRecursive.


<b>Define and reference object definitions</b>

With <b>\#define osObjectsExternal</b> objects are defined as external symbols. This allows to create a consistent header file
that is used troughtout a project as shown below:

<i>Header File</i>
\code
#include <cmsis_os.h>                                         // CMSIS RTOS header file

// Thread definition
extern void thread_sample (void const *argument);             // function prototype
osThreadDef (thread_sample, osPriorityBelowNormal, 1, 100);

// Pool definition
osPoolDef(MyPool, 10, long);                      
\endcode


This header file defines all objects when included in a C/C++ source file. When <b>\#define osObjectsExternal</b> is 
present before the header file, the objects are defined as external symbols. A single consistent header file can therefore be
used throughout the whole project.

<i>Example</i>
\code
#include "osObjects.h"     // Definition of the CMSIS-RTOS objects
\endcode

\code
#define osObjectExternal   // Objects will be defined as external symbols
#include "osObjects.h"     // Reference to the CMSIS-RTOS objects
\endcode

*/
 
#ifndef _CMSIS_OS_H
#define _CMSIS_OS_H

#include <rtthread.h>

/// \note MUST REMAIN UNCHANGED: \b osCMSIS identifies the CMSIS-RTOS API version
#define osCMSIS           0x00003      ///< API version (main [31:16] .sub [15:0])

/// \note CAN BE CHANGED: \b osCMSIS_KERNEL identifies the underlaying RTOS kernel and version number.
#define osCMSIS_RTT    0x10001	   ///< RTOS identification and version (main [31:16] .sub [15:0])

/// \note MUST REMAIN UNCHANGED: \b osKernelSystemId shall be consistent in every CMSIS-RTOS.
#define osKernelSystemId "RT-Thread V1.1.0"   ///< RTOS identification string

/// \note MUST REMAIN UNCHANGED: \b osFeature_xxx shall be consistent in every CMSIS-RTOS.
#define osFeature_MainThread   1       ///< main thread      1=main can be thread, 0=not available
#define osFeature_Pool         1       ///< Memory Pools:    1=available, 0=not available
#define osFeature_MailQ        1       ///< Mail Queues:     1=available, 0=not available
#define osFeature_MessageQ     1       ///< Message Queues:  1=available, 0=not available
#define osFeature_Signals      8       ///< maximum number of Signal Flags available per thread
#define osFeature_Semaphore    30      ///< maximum count for SemaphoreInit function
#define osFeature_Wait         1       ///< osWait function: 1=available, 0=not available
                                    
#include <stdint.h>
#include <stddef.h>

#ifdef  __cplusplus
extern "C"
{
#endif


// ==== Enumeration, structures, defines ====

/// Priority used for thread control.
/// \note MUST REMAIN UNCHANGED: \b osPriority shall be consistent in every CMSIS-RTOS.
typedef enum  {
  osPriorityIdle          = -3,          ///< priority: idle (lowest)
  osPriorityLow           = -2,          ///< priority: low
  osPriorityBelowNormal   = -1,          ///< priority: below normal
  osPriorityNormal        =  0,          ///< priority: normal (default)
  osPriorityAboveNormal   = +1,          ///< priority: above normal
  osPriorityHigh          = +2,          ///< priority: high 
  osPriorityRealtime      = +3,          ///< priority: realtime (highest)
  osPriorityError         =  0x84        ///< system cannot determine priority or thread has illegal priority
} osPriority;

/// Timeout value
/// \note MUST REMAIN UNCHANGED: \b osWaitForever shall be consistent in every CMSIS-RTOS.
#define osWaitForever     0xFFFFFFFF     ///< wait forever timeout value

/// Status code values returned by CMSIS-RTOS functions
/// \note MUST REMAIN UNCHANGED: \b osStatus shall be consistent in every CMSIS-RTOS.
typedef enum  {
  osOK                    =     0,       ///< function completed; no event occurred.
  osEventSignal           =  0x08,       ///< function completed; signal event occurred.
  osEventMessage          =  0x10,       ///< function completed; message event occurred.
  osEventMail             =  0x20,       ///< function completed; mail event occurred.
  osEventTimeout          =  0x40,       ///< function completed; timeout occurred.
  osErrorParameter        =  0x80,       ///< parameter error: a mandatory parameter was missing or specified an incorrect object.
  osErrorResource         =  0x81,       ///< resource not available: a specified resource was not available.
  osErrorTimeoutResource  =  0xC1,       ///< resource not available within given time: a specified resource was not available within the timeout period.
  osErrorISR              =  0x82,       ///< not allowed in ISR context: the function cannot be called from interrupt service routines.
  osErrorISRRecursive     =  0x83,       ///< function called multiple times from ISR with same object.
  osErrorPriority         =  0x84,       ///< system cannot determine priority or thread has illegal priority.
  osErrorNoMemory         =  0x85,       ///< system is out of memory: it was impossible to allocate or reserve memory for the operation.
  osErrorValue            =  0x86,       ///< value of a parameter is out of range.
  osErrorOS               =  0xFF,       ///< unspecified RTOS error: run-time error but no other error message fits.
  os_status_reserved      =  0x7FFFFFFF  ///< prevent from enum down-size compiler optimization.
} osStatus; 


/// Timer type value for the timer definition
/// \note MUST REMAIN UNCHANGED: \b os_timer_type shall be consistent in every CMSIS-RTOS.
typedef enum  {
  osTimerOnce             =     0,       ///< one-shot timer 
  osTimerPeriodic         =     1        ///< repeating timer 
} os_timer_type; 

/// Entry point of a thread.
/// \note MUST REMAIN UNCHANGED: \b os_pthread shall be consistent in every CMSIS-RTOS.
typedef void (*os_pthread) (void const *argument); 

/// Entry point of a timer call back function.
/// \note MUST REMAIN UNCHANGED: \b os_ptimer shall be consistent in every CMSIS-RTOS.
typedef void (*os_ptimer) (void const *argument); 

// >>> the following data type definitions may shall adapted towards a specific RTOS

/// Thread ID identifies the thread (pointer to a thread control block).
/// \note CAN BE CHANGED: \b os_thread_cb is implementation specific in every CMSIS-RTOS.
typedef struct rt_thread *osThreadId;

/// Timer ID identifies the timer (pointer to a timer control block).
/// \note CAN BE CHANGED: \b os_timer_cb is implementation specific in every CMSIS-RTOS.
typedef struct rt_timer *osTimerId;

/// Mutex ID identifies the mutex (pointer to a mutex control block).
/// \note CAN BE CHANGED: \b os_mutex_cb is implementation specific in every CMSIS-RTOS.
typedef struct rt_mutex *osMutexId;

/// Semaphore ID identifies the semaphore (pointer to a semaphore control block).
/// \note CAN BE CHANGED: \b os_semaphore_cb is implementation specific in every CMSIS-RTOS.
typedef struct rt_semaphore *osSemaphoreId;

/// Pool ID identifies the memory pool (pointer to a memory pool control block).
/// \note CAN BE CHANGED: \b os_pool_cb is implementation specific in every CMSIS-RTOS.
typedef struct rt_mempool *osPoolId;

/// Message ID identifies the message queue (pointer to a message queue control block).
/// \note CAN BE CHANGED: \b os_messageQ_cb is implementation specific in every CMSIS-RTOS.
typedef struct rt_messagequeue *osMessageQId;

/// Mail ID identifies the mail queue (pointer to a mail queue control block).
/// \note CAN BE CHANGED: \b os_mailQ_cb is implementation specific in every CMSIS-RTOS.
typedef struct rt_mailbox *osMailQId;


/// Thread Definition structure contains startup information of a thread.
/// \note CAN BE CHANGED: \b os_thread_def is implementation specific in every CMSIS-RTOS.
typedef const struct os_thread_def  {
	const char *name;
	void (*entry)(void *parameter);
	rt_uint32_t stack_size;
	rt_uint8_t priority;
	rt_uint32_t tick;
} osThreadDef_t;

/// Timer Definition structure contains timer parameters.
/// \note CAN BE CHANGED: \b os_timer_def is implementation specific in every CMSIS-RTOS.
typedef const struct os_timer_def  {
	const char *name;
	void (*timeout)(void *parameter);
	void *parameter;
	rt_tick_t time;
	rt_uint8_t flag;
} osTimerDef_t;

/// Mutex Definition structure contains setup information for a mutex.
/// \note CAN BE CHANGED: \b os_mutex_def is implementation specific in every CMSIS-RTOS.
typedef const struct os_mutex_def  {
	const char *name;
	rt_uint8_t flag;	
} osMutexDef_t;

/// Semaphore Definition structure contains setup information for a semaphore.
/// \note CAN BE CHANGED: \b os_semaphore_def is implementation specific in every CMSIS-RTOS.
typedef const struct os_semaphore_def  {
	const char *name;
	rt_uint8_t flag;
} osSemaphoreDef_t;

/// Definition structure for memory block allocation
/// \note CAN BE CHANGED: \b os_pool_def is implementation specific in every CMSIS-RTOS.
typedef const struct os_pool_def  {
	const char *name;
	rt_size_t block_count;
	rt_size_t block_size;
} osPoolDef_t;

/// Definition structure for message queue
/// \note CAN BE CHANGED: \b os_messageQ_def is implementation specific in every CMSIS-RTOS.
typedef const struct os_messageQ_def  {
	const char *name;
	rt_size_t msg_size;
	rt_size_t max_msgs;
	rt_uint8_t flag;
} osMessageQDef_t;

/// Definition structure for mail queue
/// \note CAN BE CHANGED: \b os_mailQ_def is implementation specific in every CMSIS-RTOS.
typedef const struct os_mailQ_def  {
	const char *name;
	rt_size_t size;
	rt_uint8_t flag;
} osMailQDef_t;

/// Event structure contains detailed information about an event. 
/// \note MUST REMAIN UNCHANGED: \b os_event shall be consistent in every CMSIS-RTOS. 
///       However the struct may be extended at the end.
typedef struct  {
  osStatus                 status;     ///< status code: event or error information
  union  {
    uint32_t                    v;     ///< message as 32-bit value 
    void                       *p;     ///< message or mail as void pointer
    int32_t               signals;     ///< signal flags 
  } value;                             ///< event value
  union  {
    osMailQId             mail_id;     ///< mail id obtained by \ref osMailCreate 
    osMessageQId       message_id;     ///< message id obtained by \ref osMessageCreate 
  } def;                               ///< event definition
} osEvent;


//  ==== Kernel Control Functions ====

/// Start the RTOS Kernel with executing the specified thread.
/// \param[in]     thread_def    thread definition referenced with \ref osThread.
/// \param[in]     argument      pointer that is passed to the thread function as start argument.
/// \return status code that indicates the execution status of the function.
/// \note MUST REMAIN UNCHANGED: \b osKernelStart shall be consistent in every CMSIS-RTOS. 
osStatus osKernelStart (osThreadDef_t *thread_def, void *argument);
   
/// Check if the RTOS kernel is already started.
/// \note MUST REMAIN UNCHANGED: \b osKernelRunning shall be consistent in every CMSIS-RTOS. 
/// \return 0 RTOS is not started, 1 RTOS is started.
int32_t osKernelRunning(void);


//  ==== Thread Management ====

/// Create a Thread Definition with function, priority, and stack requirements.
/// \param         name         name of the thread function.
/// \param         priority     initial priority of the thread function.
/// \param         instances    number of possible thread instances.
/// \param         stacksz      stack size (in bytes) requirements for the thread function.
/// \note CAN BE CHANGED: The parameters to \b osThreadDef shall be consistent but the 
///       macro body is implementation specific in every CMSIS-RTOS.
#if defined (osObjectsExternal)  // object is external
#define osThreadDef(name, priority, instances, stacksz)  \
extern osThreadDef_t os_thread_def_##name
#else                            // define the object
#define osThreadDef(name, priority, instances, stacksz)  \
osThreadDef_t os_thread_def_##name = \
{("cmsis"), (name), (stacksz), ((rt_uint8_t)(priority - osPriorityIdle) + 1), 50}
#endif

/// Access a Thread defintion.
/// \param         name          name of the thread definition object.
/// \note CAN BE CHANGED: The parameter to \b osThread shall be consistent but the 
///       macro body is implementation specific in every CMSIS-RTOS.
#define osThread(name)  \
&os_thread_def_##name


/// Create a thread and add it to Active Threads and set it to state READY.
/// \param[in]     thread_def    thread definition referenced with \ref osThread.
/// \param[in]     argument      pointer that is passed to the thread function as start argument.
/// \return thread ID for reference by other functions or NULL in case of error.
/// \note MUST REMAIN UNCHANGED: \b osThreadCreate shall be consistent in every CMSIS-RTOS.
osThreadId osThreadCreate (osThreadDef_t *thread_def, void *argument);

/// Return the thread ID of the current running thread.
/// \return thread ID for reference by other functions or NULL in case of error.
/// \note MUST REMAIN UNCHANGED: \b osThreadGetId shall be consistent in every CMSIS-RTOS.
osThreadId osThreadGetId (void);

/// Terminate execution of a thread and remove it from Active Threads.
/// \param[in]     thread_id   thread ID obtained by \ref osThreadCreate or \ref osThreadGetId.
/// \return status code that indicates the execution status of the function.
/// \note MUST REMAIN UNCHANGED: \b osThreadTerminate shall be consistent in every CMSIS-RTOS.
osStatus osThreadTerminate (osThreadId thread_id);

/// Pass control to next thread that is in state \b READY.
/// \return status code that indicates the execution status of the function.
/// \note MUST REMAIN UNCHANGED: \b osThreadYield shall be consistent in every CMSIS-RTOS.
osStatus osThreadYield (void);

/// Change priority of an active thread.  
/// \param[in]     thread_id     thread ID obtained by \ref osThreadCreate or \ref osThreadGetId.
/// \param[in]     priority      new priority value for the thread function.
/// \return status code that indicates the execution status of the function.
/// \note MUST REMAIN UNCHANGED: \b osThreadSetPriority shall be consistent in every CMSIS-RTOS.
osStatus osThreadSetPriority (osThreadId thread_id, osPriority priority);

/// Get current priority of an active thread.
/// \param[in]     thread_id     thread ID obtained by \ref osThreadCreate or \ref osThreadGetId.
/// \return current priority value of the thread function.
/// \note MUST REMAIN UNCHANGED: \b osThreadGetPriority shall be consistent in every CMSIS-RTOS.
osPriority osThreadGetPriority (osThreadId thread_id);



//  ==== Generic Wait Functions ====

/// Wait for Timeout (Time Delay)
/// \param[in]     millisec      time delay value 
/// \return status code that indicates the execution status of the function.
osStatus osDelay (uint32_t millisec);

#if (defined (osFeature_Wait)  &&  (osFeature_Wait != 0))     // Generic Wait available

/// Wait for Signal, Message, Mail, or Timeout
/// \param[in] millisec          timeout value or 0 in case of no time-out
/// \return event that contains signal, message, or mail information or error code.
/// \note MUST REMAIN UNCHANGED: \b osWait shall be consistent in every CMSIS-RTOS.
osEvent osWait (uint32_t millisec);

#endif  // Generic Wait available


//  ==== Timer Management Functions ====
/// Define a Timer object.
/// \param         name          name of the timer object.
/// \param         function      name of the timer call back function.
/// \note CAN BE CHANGED: The parameter to \b osTimerDef shall be consistent but the 
///       macro body is implementation specific in every CMSIS-RTOS.
#if defined (osObjectsExternal)  // object is external
#define osTimerDef(name, function)  \
extern osTimerDef_t os_timer_def_##name
#else                            // define the object
#define osTimerDef(name, function)  \
osTimerDef_t os_timer_def_##name = \
{("timer"), (function), (RT_NULL) }
#endif

/// Access a Timer definition.
/// \param         name          name of the timer object.
/// \note CAN BE CHANGED: The parameter to \b osTimer shall be consistent but the 
///       macro body is implementation specific in every CMSIS-RTOS.
#define osTimer(name) \
&os_timer_def_##name

/// Create a timer.
/// \param[in]     timer_def     timer object referenced with \ref osTimer.
/// \param[in]     type          osTimerOnce for one-shot or osTimerPeriodic for periodic behavior.
/// \param[in]     argument      argument to the timer call back function.
/// \return timer ID for reference by other functions or NULL in case of error.
/// \note MUST REMAIN UNCHANGED: \b osTimerCreate shall be consistent in every CMSIS-RTOS.
osTimerId osTimerCreate (osTimerDef_t *timer_def, os_timer_type type, void *argument);

/// Start or restart a timer.
/// \param[in]     timer_id      timer ID obtained by \ref osTimerCreate.
/// \param[in]     millisec      time delay value of the timer.
/// \return status code that indicates the execution status of the function.
/// \note MUST REMAIN UNCHANGED: \b osTimerStart shall be consistent in every CMSIS-RTOS.
osStatus osTimerStart (osTimerId timer_id, uint32_t millisec);

/// Stop the timer.
/// \param[in]     timer_id      timer ID obtained by \ref osTimerCreate.
/// \return status code that indicates the execution status of the function.
/// \note MUST REMAIN UNCHANGED: \b osTimerStop shall be consistent in every CMSIS-RTOS.
osStatus osTimerStop (osTimerId timer_id);


//  ==== Signal Management ====

/// Set the specified Signal Flags of an active thread.
/// \param[in]     thread_id     thread ID obtained by \ref osThreadCreate or \ref osThreadGetId.
/// \param[in]     signals       specifies the signal flags of the thread that should be set.
/// \return previous signal flags of the specified thread or 0x80000000 in case of incorrect parameters.
/// \note MUST REMAIN UNCHANGED: \b osSignalSet shall be consistent in every CMSIS-RTOS.
int32_t osSignalSet (osThreadId thread_id, int32_t signal);

/// Clear the specified Signal Flags of an active thread.
/// \param[in]     thread_id     thread ID obtained by \ref osThreadCreate or \ref osThreadGetId.
/// \param[in]     signals       specifies the signal flags of the thread that shall be cleared.
/// \return previous signal flags of the specified thread or 0x80000000 in case of incorrect parameters.
/// \note MUST REMAIN UNCHANGED: \b osSignalClear shall be consistent in every CMSIS-RTOS.
int32_t osSignalClear (osThreadId thread_id, int32_t signal);

/// Get Signal Flags status of an active thread.
/// \param[in]     thread_id     thread ID obtained by \ref osThreadCreate or \ref osThreadGetId.
/// \return previous signal flags of the specified thread or 0x80000000 in case of incorrect parameters.
/// \note MUST REMAIN UNCHANGED: \b osSignalGet shall be consistent in every CMSIS-RTOS.
int32_t osSignalGet (osThreadId thread_id);

/// Wait for one or more Signal Flags to become signaled for the current \b RUNNING thread.
/// \param[in]     signals       wait until all specified signal flags set or 0 for any single signal flag.
/// \param[in]     millisec      timeout value or 0 in case of no time-out.
/// \return event flag information or error code.
/// \note MUST REMAIN UNCHANGED: \b osSignalWait shall be consistent in every CMSIS-RTOS.
osEvent osSignalWait (int32_t signals, uint32_t millisec);


//  ==== Mutex Management ====

/// Define a Mutex.
/// \param         name          name of the mutex object.
/// \note CAN BE CHANGED: The parameter to \b osMutexDef shall be consistent but the 
///       macro body is implementation specific in every CMSIS-RTOS.
#if defined (osObjectsExternal)  // object is external
#define osMutexDef(name)  \
extern osMutexDef_t os_mutex_def_##name
#else                            // define the object
#define osMutexDef(name)  \
osMutexDef_t os_mutex_def_##name = { 0 }
#endif

/// Access a Mutex defintion.
/// \param         name          name of the mutex object.
/// \note CAN BE CHANGED: The parameter to \b osMutex shall be consistent but the 
///       macro body is implementation specific in every CMSIS-RTOS.
#define osMutex(name)  \
&os_mutex_def_##name

/// Create and Initialize a Mutex object
/// \param[in]     mutex_def     mutex definition referenced with \ref osMutex.
/// \return mutex ID for reference by other functions or NULL in case of error.
/// \note MUST REMAIN UNCHANGED: \b osMutexCreate shall be consistent in every CMSIS-RTOS.
osMutexId osMutexCreate (osMutexDef_t *mutex_def);

/// Wait until a Mutex becomes available
/// \param[in]     mutex_id      mutex ID obtained by \ref osMutexCreate.
/// \param[in]     millisec      timeout value or 0 in case of no time-out.
/// \return status code that indicates the execution status of the function.
/// \note MUST REMAIN UNCHANGED: \b osMutexWait shall be consistent in every CMSIS-RTOS.
osStatus osMutexWait (osMutexId mutex_id, uint32_t millisec);

/// Release a Mutex that was obtained by \ref osMutexWait
/// \param[in]     mutex_id      mutex ID obtained by \ref osMutexCreate.
/// \return status code that indicates the execution status of the function.
/// \note MUST REMAIN UNCHANGED: \b osMutexRelease shall be consistent in every CMSIS-RTOS.
osStatus osMutexRelease (osMutexId mutex_id);


//  ==== Semaphore Management Functions ====

#if (defined (osFeature_Semaphore)  &&  (osFeature_Semaphore != 0))     // Semaphore available

/// Define a Semaphore object.
/// \param         name          name of the semaphore object.
/// \note CAN BE CHANGED: The parameter to \b osSemaphoreDef shall be consistent but the 
///       macro body is implementation specific in every CMSIS-RTOS.
#if defined (osObjectsExternal)  // object is external
#define osSemaphoreDef(name)  \
extern osSemaphoreDef_t os_semaphore_def_##name
#else                            // define the object
#define osSemaphoreDef(name)  \
osSemaphoreDef_t os_semaphore_def_##name = { 0 }
#endif

/// Access a Semaphore definition.
/// \param         name          name of the semaphore object.
/// \note CAN BE CHANGED: The parameter to \b osSemaphore shall be consistent but the 
///       macro body is implementation specific in every CMSIS-RTOS.
#define osSemaphore(name)  \
&os_semaphore_def_##name

/// Create and Initialize a Semaphore object used for managing resources
/// \param[in]     semaphore_def semaphore definition referenced with \ref osSemaphore.
/// \param[in]     count         number of available resources.
/// \return semaphore ID for reference by other functions or NULL in case of error.
/// \note MUST REMAIN UNCHANGED: \b osSemaphoreCreate shall be consistent in every CMSIS-RTOS.
osSemaphoreId osSemaphoreCreate (osSemaphoreDef_t *semaphore_def, int32_t count);

/// Wait until a Semaphore token becomes available
/// \param[in]     semaphore_id  semaphore object referenced with \ref osSemaphore.
/// \param[in]     millisec      timeout value or 0 in case of no time-out.
/// \return number of available tokens, or -1 in case of incorrect parameters.
/// \note MUST REMAIN UNCHANGED: \b osSemaphoreWait shall be consistent in every CMSIS-RTOS.
int32_t osSemaphoreWait (osSemaphoreId semaphore_id, uint32_t millisec);

/// Release a Semaphore token
/// \param[in]     semaphore_id  semaphore object referenced with \ref osSemaphore.
/// \return status code that indicates the execution status of the function.
/// \note MUST REMAIN UNCHANGED: \b osSemaphoreRelease shall be consistent in every CMSIS-RTOS.
osStatus osSemaphoreRelease (osSemaphoreId semaphore_id);

#endif     // Semaphore available
 
//  ==== Memory Pool Management Functions ====

#if (defined (osFeature_Pool)  &&  (osFeature_Pool != 0))  // Memory Pool Management available

/// \brief Define a Memory Pool.
/// \param         name          name of the memory pool.
/// \param         no            maximum number of objects (elements) in the memory pool.
/// \param         type          data type of a single object (element).
/// \note CAN BE CHANGED: The parameter to \b osPoolDef shall be consistent but the 
///       macro body is implementation specific in every CMSIS-RTOS.
#if defined (osObjectsExternal)  // object is external
#define osPoolDef(name, no, type)   \
extern osPoolDef_t os_pool_def_##name
#else                            // define the object
#define osPoolDef(name, no, type)   \
osPoolDef_t os_pool_def_##name = \
{ (no), sizeof(type), NULL }
#endif

/// \brief Access a Memory Pool definition.
/// \param         name          name of the memory pool
/// \note CAN BE CHANGED: The parameter to \b osPool shall be consistent but the 
///       macro body is implementation specific in every CMSIS-RTOS.
#define osPool(name) \
&os_pool_def_##name

/// Create and Initialize a memory pool
/// \param[in]     pool_def      memory pool definition referenced with \ref osPool.
/// \return memory pool ID for reference by other functions or NULL in case of error.
/// \note MUST REMAIN UNCHANGED: \b osPoolCreate shall be consistent in every CMSIS-RTOS.
osPoolId osPoolCreate (osPoolDef_t *pool_def);

/// Allocate a memory block from a memory pool
/// \param[in]     pool_id       memory pool ID obtain referenced with \ref osPoolCreate.
/// \return address of the allocated memory block or NULL in case of no memory available.
/// \note MUST REMAIN UNCHANGED: \b osPoolAlloc shall be consistent in every CMSIS-RTOS.
void *osPoolAlloc (osPoolId pool_id);

/// Allocate a memory block from a memory pool and set memory block to zero 
/// \param[in]     pool_id       memory pool ID obtain referenced with \ref osPoolCreate.
/// \return address of the allocated memory block or NULL in case of no memory available.
/// \note MUST REMAIN UNCHANGED: \b osPoolCAlloc shall be consistent in every CMSIS-RTOS.
void *osPoolCAlloc (osPoolId pool_id);

/// Return an allocated memory block back to a specific memory pool
/// \param[in]     pool_id       memory pool ID obtain referenced with \ref osPoolCreate.
/// \param[in]     block         address of the allocated memory block that is returned to the memory pool.
/// \return status code that indicates the execution status of the function.
/// \note MUST REMAIN UNCHANGED: \b osPoolFree shall be consistent in every CMSIS-RTOS.
osStatus osPoolFree (osPoolId pool_id, void *block);

#endif   // Memory Pool Management available


//  ==== Message Queue Management Functions ====

#if (defined (osFeature_MessageQ)  &&  (osFeature_MessageQ != 0))     // Message Queues available

/// \brief Create a Message Queue Definition.
/// \param         name          name of the queue.
/// \param         queue_sz      maximum number of messages in the queue.
/// \param         type          data type of a single message element (for debugger).
/// \note CAN BE CHANGED: The parameter to \b osMessageQDef shall be consistent but the 
///       macro body is implementation specific in every CMSIS-RTOS.
#if defined (osObjectsExternal)  // object is external
#define osMessageQDef(name, queue_sz, type)   \
extern osMessageQDef_t os_messageQ_def_##name
#else                            // define the object
#define osMessageQDef(name, queue_sz, type)   \
osMessageQDef_t os_messageQ_def_##name = \
{ (queue_sz), sizeof (type)  }
#endif

/// \brief Access a Message Queue Definition.
/// \param         name          name of the queue
/// \note CAN BE CHANGED: The parameter to \b osMessageQ shall be consistent but the 
///       macro body is implementation specific in every CMSIS-RTOS.
#define osMessageQ(name) \
&os_messageQ_def_##name

/// Create and Initialize a Message Queue.
/// \param[in]     queue_def     queue definition referenced with \ref osMessageQ.
/// \param[in]     thread_id     thread ID (obtained by \ref osThreadCreate or \ref osThreadGetId) or NULL.
/// \return message queue ID for reference by other functions or NULL in case of error.
/// \note MUST REMAIN UNCHANGED: \b osMessageCreate shall be consistent in every CMSIS-RTOS.
osMessageQId osMessageCreate (osMessageQDef_t *queue_def, osThreadId thread_id);

/// Put a Message to a Queue.
/// \param[in]     queue_id      message queue ID obtained with \ref osMessageCreate.
/// \param[in]     info          message information.
/// \param[in]     millisec      timeout value or 0 in case of no time-out.
/// \return status code that indicates the execution status of the function.
/// \note MUST REMAIN UNCHANGED: \b osMessagePut shall be consistent in every CMSIS-RTOS.
osStatus osMessagePut (osMessageQId queue_id, uint32_t info, uint32_t millisec);

/// Get a Message or Wait for a Message from a Queue.
/// \param[in]     queue_id      message queue ID obtained with \ref osMessageCreate.
/// \param[in]     millisec      timeout value or 0 in case of no time-out.
/// \return event information that includes status code.
/// \note MUST REMAIN UNCHANGED: \b osMessageGet shall be consistent in every CMSIS-RTOS.
osEvent osMessageGet (osMessageQId queue_id, uint32_t millisec);

#endif     // Message Queues available


//  ==== Mail Queue Management Functions ====

#if (defined (osFeature_MailQ)  &&  (osFeature_MailQ != 0))     // Mail Queues available

/// \brief Create a Mail Queue Definition
/// \param         name          name of the queue
/// \param         queue_sz      maximum number of messages in queue
/// \param         type          data type of a single message element
/// \note CAN BE CHANGED: The parameter to \b osMailQDef shall be consistent but the 
///       macro body is implementation specific in every CMSIS-RTOS.
#if defined (osObjectsExternal)  // object is external
#define osMailQDef(name, queue_sz, type) \
extern osMailQDef_t os_mailQ_def_##name
#else                            // define the object
#define osMailQDef(name, queue_sz, type) \
osMailQDef_t os_mailQ_def_##name =  \
{ (queue_sz), sizeof (type) }
#endif
     
/// \brief Access a Mail Queue Definition
/// \param         name          name of the queue
/// \note CAN BE CHANGED: The parameter to \b osMailQ shall be consistent but the 
///       macro body is implementation specific in every CMSIS-RTOS.
#define osMailQ(name)  \
&os_mailQ_def_##name

/// Create and Initialize mail queue
/// \param[in]     queue_def     reference to the mail queue definition obtain with \ref osMailQ
/// \param[in]     thread_id     thread ID (obtained by \ref osThreadCreate or \ref osThreadGetId) or NULL.
/// \return mail queue ID for reference by other functions or NULL in case of error.
/// \note MUST REMAIN UNCHANGED: \b osMailCreate shall be consistent in every CMSIS-RTOS.
osMailQId osMailCreate (osMailQDef_t *queue_def, osThreadId thread_id);

/// Allocate a memory block from a mail
/// \param[in]     queue_id      mail queue ID obtained with \ref osMailCreate.
/// \param[in]     millisec      timeout value or 0 in case of no time-out
/// \return pointer to memory block that can be filled with mail or NULL in case error.
/// \note MUST REMAIN UNCHANGED: \b osMailAlloc shall be consistent in every CMSIS-RTOS.
void *osMailAlloc (osMailQId queue_id, uint32_t millisec);

/// Allocate a memory block from a mail and set memory block to zero
/// \param[in]     queue_id      mail queue ID obtained with \ref osMailCreate.
/// \param[in]     millisec      timeout value or 0 in case of no time-out
/// \return pointer to memory block that can shall filled with mail or NULL in case error.
/// \note MUST REMAIN UNCHANGED: \b osMailCAlloc shall be consistent in every CMSIS-RTOS.
void *osMailCAlloc (osMailQId queue_id, uint32_t millisec);

/// Put a mail to a queue
/// \param[in]     queue_id      mail queue ID obtained with \ref osMailCreate.
/// \param[in]     mail          memory block previously allocated with \ref osMailAlloc or \ref osMailCAlloc.
/// \return status code that indicates the execution status of the function.
/// \note MUST REMAIN UNCHANGED: \b osMailPut shall be consistent in every CMSIS-RTOS.
osStatus osMailPut (osMailQId queue_id, void *mail);

/// Get a mail from a queue
/// \param[in]     queue_id      mail queue ID obtained with \ref osMailCreate.
/// \param[in]     millisec      timeout value or 0 in case of no time-out
/// \return event that contains mail information or error code.
/// \note MUST REMAIN UNCHANGED: \b osMailGet shall be consistent in every CMSIS-RTOS.
osEvent osMailGet (osMailQId queue_id, uint32_t millisec);

/// Free a memory block from a mail
/// \param[in]     queue_id      mail queue ID obtained with \ref osMailCreate.
/// \param[in]     mail          pointer to the memory block that was obtained with \ref osMailGet.
/// \return status code that indicates the execution status of the function.
/// \note MUST REMAIN UNCHANGED: \b osMailFree shall be consistent in every CMSIS-RTOS.
osStatus osMailFree (osMailQId queue_id, void *mail);
                            
#endif  // Mail Queues available


#ifdef  __cplusplus
}
#endif

#endif  // _CMSIS_OS_H