1 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
2 // ==== Thread Management ====
4 \addtogroup CMSIS_RTOS_ThreadMgmt Thread Management
5 \ingroup CMSIS_RTOS CMSIS_RTOSv2
6 \brief Define, create, and control thread functions.
8 The Thread Management function group allows defining, creating, and controlling thread functions in the system.
10 \note Thread management functions cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
15 Threads can be in the following states:
17 - \b RUNNING: The thread that is currently running is in the \ref ThreadStates "RUNNING" state. Only one thread at a time can be in this
19 - \b READY: Threads which are ready to run are in the \ref ThreadStates "READY" state. Once the \ref ThreadStates "RUNNING" thread has terminated, or is
20 \ref ThreadStates "BLOCKED", the next \ref ThreadStates "READY" thread with the highest priority becomes the \ref ThreadStates "RUNNING" thread.
21 - \b BLOCKED: Threads that are blocked either delayed, waiting for an event to occur or suspended are in the \ref ThreadStates "BLOCKED"
23 - \b TERMINATED: When \ref osThreadTerminate is called, threads are \ref ThreadStates "TERMINATED" with resources not yet released.
24 - \b INACTIVE: Threads that are not created or have been terminated with all resources released are in the \ref ThreadStates "INACTIVE" state.
26 \image html "ThreadStatus.png" "Thread State and State Transitions"
29 A CMSIS-RTOS assumes that threads are scheduled as shown in the figure <b>Thread State and State Transitions</b>. The thread
30 states change as follows:
31 - A thread is created using the function \ref osThreadNew. This puts the thread into the \ref ThreadStates "READY" or \ref ThreadStates "RUNNING" state
32 (depending on the thread priority).
33 - CMSIS-RTOS is preemptive. The active thread with the highest priority becomes the \ref ThreadStates "RUNNING" thread provided it does not
34 wait for any event. The initial priority of a thread is defined with the \ref osThreadAttr_t but may be changed during
35 execution using the function \ref osThreadSetPriority.
36 - The \ref ThreadStates "RUNNING" thread transfers into the \ref ThreadStates "BLOCKED" state when it is delayed, waiting for an event or suspended.
37 - Active threads can be terminated any time using the function \ref osThreadTerminate. Threads can terminate also by just
38 returning from the thread function. Threads that are terminated are in the \ref ThreadStates "INACTIVE" state and typically do not consume
39 any dynamic memory resources.
42 Refer to \ref threadConfig for RTX5 configuration options.
44 \anchor thread_examples
47 The following examples show various scenarios to create threads:
49 <b>Example 1 - Create a simple thread</b>
51 Create a thread out of the function thread1 using all default values for thread attributes and memory from the
52 \ref GlobalMemoryPool.
55 __NO_RETURN void thread1 (void *argument) {
63 osThreadNew(thread1, NULL, NULL); // Create thread with default settings
69 <b>Example 2 - Create thread with stack non-default stack size</b>
71 Similar to the simple thread all attributes are default. The stack is dynamically allocated from the \ref GlobalMemoryPool
73 \ref osThreadAttr_t.stack_size is used to pass the stack size in Bytes to osThreadNew.
76 __NO_RETURN void thread1 (void *argument) {
81 const osThreadAttr_t thread1_attr = {
82 .stack_size = 1024 // Create the thread stack with a size of 1024 bytes
87 osThreadNew(thread1, NULL, &thread1_attr); // Create thread with custom sized stack memory
92 <b>Example 3 - Create thread with statically allocated stack</b>
94 Similar to the simple thread all attributes are default. The stack is statically allocated using the \c uint64_t array
95 \c thread1_stk_1. This allocates 64*8 Bytes (=512 Bytes) with an alignment of 8 Bytes (mandatory for Cortex-M stack memory).
97 \ref osThreadAttr_t.stack_mem holds a pointer to the stacks lowest address.
99 \ref osThreadAttr_t.stack_size is used to pass the stack size in Bytes to osThreadNew.
102 __NO_RETURN void thread1 (void *argument) {
107 static uint64_t thread1_stk_1[64];
109 const osThreadAttr_t thread1_attr = {
110 .stack_mem = &thread1_stk_1[0],
111 .stack_size = sizeof(thread1_stk_1)
116 osThreadNew(thread1, NULL, &thread1_attr); // Create thread with statically allocated stack memory
121 <b>Example 4 - Thread with statically allocated task control block</b>
123 Typically this method is chosen together with a statically allocated stack as shown in Example 2.
125 #include "cmsis_os2.h"
127 //include rtx_os.h for types of RTX objects
130 __NO_RETURN void thread1 (void *argument) {
135 static osRtxThread_t thread1_tcb;
137 const osThreadAttr_t thread1_attr = {
138 .cb_mem = &thread1_tcb,
139 .cb_size = sizeof(thread1_tcb),
144 osThreadNew(thread1, NULL, &thread1_attr); // Create thread with custom tcb memory
149 <b>Example 5 - Create thread with a different priority</b>
151 The default priority of RTX is \ref osPriorityNormal. Often you want to run a task with a higher or lower priority. Using the
152 \ref osThreadAttr_t control structure you can set any initial priority required.
155 __NO_RETURN void thread1 (void *argument) {
160 const osThreadAttr_t thread1_attr = {
161 .priority = osPriorityHigh //Set initial thread priority to high
166 osThreadNew(thread1, NULL, &thread1_attr);
171 \anchor joinable_threads
172 <b>Example 6 - Joinable threads</b>
174 In this example a master thread creates four threads with the \ref osThreadJoinable attribute. These will do some work and
175 return using the \ref osThreadExit call after finished. \ref osThreadJoin is used to synchronize the thread termination.
179 __NO_RETURN void worker (void *argument) {
180 ; // work a lot on data[]
185 __NO_RETURN void thread1 (void *argument) {
186 osThreadAttr_t worker_attr;
187 osThreadId_t worker_ids[4];
190 memset(&worker_attr, 0, sizeof(worker_attr));
191 worker_attr.attr_bits = osThreadJoinable;
193 worker_ids[0] = osThreadNew(worker, &data[0][0], &worker_attr);
194 worker_ids[1] = osThreadNew(worker, &data[1][0], &worker_attr);
195 worker_ids[2] = osThreadNew(worker, &data[2][0], &worker_attr);
196 worker_ids[3] = osThreadNew(worker, &data[3][0], &worker_attr);
198 osThreadJoin(worker_ids[0]);
199 osThreadJoin(worker_ids[1]);
200 osThreadJoin(worker_ids[2]);
201 osThreadJoin(worker_ids[3]);
209 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
211 \enum osThreadState_t
213 State of a thread as retrieved by \ref osThreadGetState. In case \b osThreadGetState fails or if it is called from an ISR, it
214 will return \c osThreadError, otherwise it returns the thread state.
216 \var osThreadState_t::osThreadInactive
217 \details The thread is created but not actively used, or has been terminated.
219 \var osThreadState_t::osThreadReady
220 \details The thread is ready for execution but not currently running.
222 \var osThreadState_t::osThreadRunning
223 \details The thread is currently running.
225 \var osThreadState_t::osThreadBlocked
226 \details The thread is currently blocked (delayed, waiting for an event or suspended).
228 \var osThreadState_t::osThreadTerminated
229 \details The thread is terminated and all its resources are freed.
231 \var osThreadState_t::osThreadError
232 \details The thread thread has raised an error condition and cannot be scheduled.
235 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
240 The \b osPriority_t value specifies the priority for a thread. The default thread priority should be \a osPriorityNormal.
241 If an active thread becomes ready that has a higher priority than the currently running thread then a thread switch occurs
242 immediately. The system continues executing the thread with the higher priority.
244 To prevent from a priority inversion, a CMSIS-RTOS compliant OS may optionally implement a <b>priority inheritance</b>
245 method. A priority inversion occurs when a high priority thread is waiting for a resource or event that is controlled by a
246 thread with a lower priority. Thus causing the high priority thread potentially beeing blocked forever by another thread
247 with lower priority. To come over this issue the low priority thread controlling the resource should be treated as having
248 the higher priority until it releases the resource.
250 \note Priority inheritance only applies to mutexes.
252 \var osPriority_t::osPriorityIdle
253 \details This lowest priority should not be used for any other thread.
255 \var osPriority_t::osPriorityISR
256 \details This highest priority might be used by the RTOS implementation but must not be used for any user thread.
259 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
261 \typedef void (*osThreadFunc_t) (void *argument)
262 \details Entry function for threads. Setting up a new thread (\ref osThreadNew) will start execution with a call into this
263 entry function. The optional argument can be used to hand over arbitrary user data to the thread, i.e. to identify the thread
264 or for runtime parameters.
266 \param[in] argument Arbitrary user data set on \ref osThreadNew.
269 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
271 \typedef osThreadId_t
272 \details Returned by:
275 - \ref osThreadEnumerate
276 - \ref osMutexGetOwner
279 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
281 \struct osThreadAttr_t
283 Specifies the following attributes for the \ref osThreadNew function.
286 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
288 \def osThreadJoinable
290 A thread in this state can be joined using \ref osThreadJoin.
294 \def osThreadDetached
296 A thread in this state cannot be joined using \ref osThreadJoin.
299 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
301 \fn osThreadId_t osThreadNew (osThreadFunc_t func, void *argument, const osThreadAttr_t *attr)
303 The function \b osThreadNew starts a thread function by adding it to the list of active threads and sets it to state
304 \ref ThreadStates "READY". Arguments for the thread function are passed using the parameter pointer \a *argument. When the priority of the
305 created thread function is higher than the current \ref ThreadStates "RUNNING" thread, the created thread function starts instantly and
306 becomes the new \ref ThreadStates "RUNNING" thread. Thread attributes are defined with the parameter pointer \a attr. Attributes include
307 settings for thread priority, stack size, or memory allocation.
309 The function can be safely called before the RTOS is
310 started (call to \ref osKernelStart), but not before it is initialized (call to \ref osKernelInitialize).
312 The function \b osThreadNew returns the pointer to the thread object identifier or \token{NULL} in case of an error.
314 Possible \ref osThreadId_t return values:
315 - pointer to the thread object, in case of success
316 - \em NULL, if the priority level is outside the permitted range: \em osPriorityIdle ... \em osPriorityISR.
317 - \em NULL, if the \em stack_mem is not \em NULL but:
318 - \em stack_mem is not a multiple of 8 bytes
319 - \em stack_size equals 0
320 - \em NULL, if \em stack_size is lower smaller than 72 bytes
321 - \em NULL, if \em stack_size is not zero and not a multiple of 8
322 - \em NULL, if the control block (attr->cb_mem) is not large enough to hold a thread control block
323 - \em NULL, if the control block (attr->cb_mem) is not 4 byte aligned
324 - \em NULL, if the maximum number of threads have been created already
325 - \em NULL, if the thread function \em func is \em NULL
326 - \em 'osErrorISR', if IRQ is masked
327 - \em 'osErrorISR', in IRQ mode.
329 \note Cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
333 Refer to the \ref thread_examples "Thread Examples" section.
336 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
338 \fn const char *osThreadGetName (osThreadId_t thread_id)
340 The function \b osThreadGetName returns the pointer to the name string of the thread identified by parameter \a thread_id or
341 \token{NULL} in case of an error.
343 Possible return values:
344 - pointer to the name string, in case of success
345 - \em NULL, if no name has been defined
346 - \em NULL, if a thread specified by \a thread_id does not exist
347 - \em NULL, if thread_id is \em NULL.
350 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
354 void ThreadGetName_example (void) {
355 osThreadId_t thread_id = osThreadGetId ();
356 const char* name = osThreadGetName (thread_id);
358 // Failed to get the thread name; not in a thread
364 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
366 \fn osThreadId_t osThreadGetId (void)
368 The function \b osThreadGetId returns the thread object ID of the currently running thread or NULL in case of an error.
370 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
374 void ThreadGetId_example (void) {
375 osThreadId_t id; // id for the currently running thread
377 id = osThreadGetId ();
379 // Failed to get the id; not in a thread
384 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
386 \fn osThreadState_t osThreadGetState (osThreadId_t thread_id)
388 The function \b osThreadGetState returns the state of the thread identified by parameter \a thread_id. In case it fails or
389 if it is called from an ISR, it will return \c osThreadError, otherwise it returns the thread state (refer to
390 \ref osThreadState_t for the list of thread states).
392 Possible \ref osThreadState_t return values:
393 - the state of the thread specified by \a thread_id, in case of success
394 - \em 'osThreadError', if the thread specified by \a thread_id is \em NULL
396 - \em 'osThreadError', if if a thread specified by \a thread_id does not exist
397 - \em 'osThreadError', if IRQ is masked
399 - \em 'osThreadError', if in IRQ mode.
401 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
404 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
406 \fn osStatus_t osThreadSetPriority (osThreadId_t thread_id, osPriority_t priority)
408 The function \b osThreadSetPriority changes the priority of an active thread specified by the parameter \a thread_id to the
409 priority specified by the parameter \a priority.
411 Possible \ref osStatus_t return values:
412 - \em 'osOK', if the priority of thread specified by \a thread_id has been changed successfully
413 - \em 'osErrorParameter', if the thread specified by \a thread_id is \em NULL
414 - \em 'osErrorParameter', if a thread specified by \a thread_id does not exist
415 - \em 'osErrorParameter', if \em osPriorityIdle < \em priority or \em priority > \em osPriorityISR
416 - \em 'osErrorResource', if the thread is in state \em 'osThreadInactive' or \em 'osThreadTerminated'
417 - \em 'osErrorISR', if IRQ is masked
418 - \em 'osErrorISR', if in IRQ mode.
420 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
424 #include "cmsis_os2.h"
426 void Thread_1 (void const *arg) { // Thread function
427 osThreadId_t id; // id for the currently running thread
428 osStatus_t status; // status of the executed function
431 id = osThreadGetId (); // Obtain ID of current running thread
433 status = osThreadSetPriority (id, osPriorityBelowNormal); // Set thread priority
434 if (status == osOK) {
435 // Thread priority changed to BelowNormal
438 // Failed to set the priority
444 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
446 \fn osPriority_t osThreadGetPriority (osThreadId_t thread_id)
448 The function \b osThreadGetPriority returns the priority of an active thread specified by the parameter \a thread_id.
450 Possible \ref osPriority_t return values:
451 - the priority of the thread specified by \em thread_id, in case of success
452 - \em 'osPriorityError', if the threads specified by \em thread_id is in state \em 'osRtxObjectInactive' or \em 'osRtxObjectTerminated'
453 - \em 'osPriorityError', if a thread specified by \em thread_id does not exist
454 - \em 'osPriorityError', if the thread is \em NULL.
456 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
460 #include "cmsis_os2.h"
462 void Thread_1 (void const *arg) { // Thread function
463 osThreadId_t id; // id for the currently running thread
464 osPriority_t priority; // thread priority
466 id = osThreadGetId (); // Obtain ID of current running thread
467 priority = osThreadGetPriority (id); // Obtain the thread priority
471 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
473 \fn osStatus_t osThreadYield (void)
475 The function \b osThreadYield passes control to the next thread with the same priority that is in the \ref ThreadStates "READY" state.
476 If there is no other thread with the same priority in state \ref ThreadStates "READY", then the current thread continues execution and
477 no thread switch occurs. \b osThreadYield does not set the thread to state \ref ThreadStates "BLOCKED". Thus no thread with a lower
478 priority will be scheduled even if threads in state \ref ThreadStates "READY" are available.
480 Possible \ref osStatus_t return values:
481 - \em 'osOK', if control has been passed to the next thread successfully
482 - \em 'osErrorISR', if IRQ is masked
483 - \em 'osErrorISR', if in IRQ mode.
486 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
487 \note This function <b>has no impact</b> when called when the kernel is locked, see \ref osKernelLock.
491 #include "cmsis_os2.h"
493 void Thread_1 (void const *arg) { // Thread function
494 osStatus_t status; // status of the executed function
497 status = osThreadYield(); //
498 if (status != osOK) {
505 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
507 \fn osStatus_t osThreadSuspend (osThreadId_t thread_id)
509 The function \b osThreadSuspend suspends the execution of the thread identified by parameter \em thread_id. The thread is put
510 into the \ref ThreadStates "BLOCKED" state (\ref osThreadBlocked). Suspending the running thread will cause a context switch to another
511 thread in \ref ThreadStates "READY" state immediately. The suspended thread is not executed until explicitly resumed with the function \ref osThreadResume.
513 Threads that are already \ref ThreadStates "BLOCKED" are removed from any wait list and become ready when they are resumed.
514 Thus it is not recommended to suspend an already blocked thread.
516 Possible \ref osStatus_t return values:
517 - \em 'osOK', if the thread has been suspended successfully
518 - \em 'osErrorParameter', if a thread specified by \a thread_id does not exist
519 - \em 'osErrorParameter', if the thread specified by \a thread_id is NULL
521 - \em 'osErrorResource', if no thread is in state \em 'osRtxThreadReady' or the kernel is not running
523 - \em 'osErrorResource', the the thread specified by \a thread_id is in state \em 'osRtxThreadInactive'
525 - \em 'osErrorResource', the the thread specified by \a thread_id is in state \em 'osRtxThreadTerminated'
527 - \em 'osErrorISR', if IRQ is masked
529 - \em 'osErrorISR', if in IRQ mode.
532 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
533 \note This function <b>must not</b> be called to suspend the running thread when the kernel is locked, i.e. \ref osKernelLock.
537 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
539 \fn osStatus_t osThreadResume (osThreadId_t thread_id)
541 The function \b osThreadResume puts the thread identified by parameter \em thread_id (which has to be in \ref ThreadStates "BLOCKED" state)
542 back to the \ref ThreadStates "READY" state. If the resumed thread has a higher priority than the running thread a context switch occurs immediately.
544 The thread becomes ready regardless of the reason why the thread was blocked. Thus it is not recommended to resume a thread not suspended
545 by \ref osThreadSuspend.
547 Functions that will put a thread into \ref ThreadStates "BLOCKED" state are:
548 \ref osEventFlagsWait and \ref osThreadFlagsWait,
549 \ref osDelay and \ref osDelayUntil,
550 \ref osMutexAcquire and \ref osSemaphoreAcquire,
551 \ref osMessageQueueGet,
552 \ref osMemoryPoolAlloc,
554 \ref osThreadSuspend.
556 Possible \ref osStatus_t return values:
557 - \em 'osOK', if the thread specified by \a thread_id has been resumed successfully
558 - \em 'osErrorParameter', if a thread specified by \a thread_id does not exist
559 - \em 'osErrorParameter', if the thread specified by \a thread_id is \em NULL
560 - \em 'osErrorResource', if the state of the thread specified by \a thread_id is not 'Blocked'.
561 - \em 'osErrorISR', if IRQ is masked
562 - \em 'osErrorISR', in IRQ mode.
564 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
565 \note This function <b>may be</b> called when kernel is locked (\ref osKernelLock). Under this circumstances
566 a potential context switch is delayed until the kernel gets unlocked, i.e. \ref osKernelUnlock or \ref osKernelRestoreLock.
570 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
572 \fn osStatus_t osThreadDetach (osThreadId_t thread_id)
574 The function \b osThreadDetach changes the attribute of a thread (specified by \em thread_id) to \ref osThreadDetached.
575 Detached threads are not joinable with \ref osThreadJoin. When a detached thread is terminated, all resources are returned to
576 the system. The behavior of \ref osThreadDetach on an already detached thread is undefined.
578 Possible \ref osStatus_t return values:
579 - \em 'osOK', if the attribute of the thread specified by \a thread_id has been changed to detached successfully.
580 - \em 'osErrorParameter', if \em thread_id is \em NULL
581 - \em 'osErrorParameter', if a thread specified by \a thread_id does not exist
582 - \em 'osErrorResource', if the thread is in state \em 'osRtxThreadInactive'
583 - \em 'osErrorResource', if the thread is marked as \em 'osThreadDetached'
584 - \em 'osErrorISR', if IRQ is masked
585 - \em 'osErrorISR', if in IRQ mode.
588 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
591 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
593 \fn osStatus_t osThreadJoin (osThreadId_t thread_id)
595 The function \b osThreadJoin waits for the thread specified by \em thread_id to terminate. If that thread has already
596 terminated, then \ref osThreadJoin returns immediately. The thread must be joinable. By default threads are created with the
597 attribute \ref osThreadDetached.
599 Possible \ref osStatus_t return values:
600 - \em 'osOK', in case of success
601 - \em 'osErrorParameter', if the thread is \em NULL
602 - \em 'osErrorParameter', if a thread specified by \a thread_id does not exist
603 - \em 'osErrorResource', if the thread specified by \a thread_id is marked as not joinable
605 - \em 'osErrorResource', if the state of the thread is \em 'osRtxThreadInactive' or \em 'osRtxThreadRunning'
606 - \em 'osErrorResource', if the kernel is not running
607 - \em 'osErrorISR', if IRQ is masked
609 - \em 'osErrorISR', if in IRQ mode.
611 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
614 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
616 \fn __NO_RETURN void osThreadExit (void)
619 The function \b osThreadExit terminates the calling thread. This allows the thread to be synchronized with \ref osThreadJoin.
621 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
625 __NO_RETURN void worker (void *argument) {
633 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
635 \fn osStatus_t osThreadTerminate (osThreadId_t thread_id)
637 The function \b osThreadTerminate removes the thread specified by parameter \a thread_id from the list of active threads. If
638 the thread is currently \ref ThreadStates "RUNNING", the thread terminates and the execution continues with the next \ref ThreadStates "READY" thread. If no
639 such thread exists, the function will not terminate the running thread, but return \em osErrorResource.
641 Possible \ref osStatus_t return values:
642 - \em 'osOK', if the thread specified by \a thread_id has been removed from the active thread list successfully
643 - \em 'osErrorParameter', if the thread specified by \a thread_id does not exist
644 - \em 'osErrorParameter', if a thread with \em thread_id is \em NULL
645 - \em 'osErrorResource', if the thread is in state \em 'osRtxThreadInactive' or \em 'osRtxThreadTerminated'
646 - \em 'osErrorResource', if no thread is in state \em 'osRtxThreadReady' that can run next
647 - \em 'osErrorResource', if the kernel is not running
648 - \em 'osErrorISR', if IRQ is masked
650 - \em 'osErrorISR', if in IRQ mode.
653 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
654 \note Avoid calling the function with a \em thread_id that does not exist or has been terminated already.
658 #include "cmsis_os2.h"
660 void Thread_1 (void *arg); // function prototype for Thread_1
662 void ThreadTerminate_example (void) {
666 id = osThreadNew (Thread_1, NULL, NULL); // create the thread
668 status = osThreadTerminate (id); // stop the thread
669 if (status == osOK) {
670 // Thread was terminated successfully
673 // Failed to terminate a thread
679 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
681 \fn uint32_t osThreadGetStackSize (osThreadId_t thread_id)
683 The function \b osThreadGetStackSize returns the stack size of the thread specified by parameter \a thread_id. In case of an
684 error, it returns \token{0}.
688 Possible return values:
689 - the stack size of the thread
690 - \em 0, if a thread specified by \a thread_id does not exist
691 - \em 0, if the thread specified by \em thread_id is \em NULL
692 - \em 0, if the thread is in state \em 'osRtxObjectInactive'
693 - \em 0, if IRQ is masked
694 - \em 0, if in IRQ mode.
697 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
700 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
702 \fn uint32_t osThreadGetStackSpace (osThreadId_t thread_id);
704 The function \b osThreadGetStackSpace returns the size of unused stack space for the thread specified by parameter
705 \a thread_id. Stack watermark recording during execution needs to be enabled (refer to \ref threadConfig). In case of an
706 error, it returns \token{0}.
708 Possible return values:
709 - the size of unused stack space, in case of success
710 - \em 0, if a thread specified by \a thread_id does not exist
711 - \em 0, if the thread with \em thread_id is \em NULL
712 - \em 0, if the thread is in state \em 'osRtxObjectInactive'
713 - \em 0, if stack watermark is not enabled
714 - \em 0, if IRQ is masked
715 - \em 0, if in IRQ mode
718 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
721 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
723 \fn uint32_t osThreadGetCount (void)
725 The function \b osThreadGetCount returns the number of active threads or \token{0} in case of an error.
727 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
730 /*=======0=========1=========2=========3=========4=========5=========6=========7=========8=========9=========0=========1====*/
732 \fn uint32_t osThreadEnumerate (osThreadId_t *thread_array, uint32_t array_items)
734 The function \b osThreadEnumerate returns the number of enumerated threads or \token{0} in case of an error.
736 Possible return values:
737 - number of enumerated threads, in case of success
738 - \em 0, if \em thread_array is \em NULL
739 - \em 0, if \em array_items = 0
740 - \em 0, if IRQ is masked
741 - \em 0, if in IRQ mode.
743 \note This function \b cannot be called from \ref CMSIS_RTOS_ISR_Calls "Interrupt Service Routines".
749 // these struct members must stay outside the group to avoid double entries in documentation
751 \var osThreadAttr_t::attr_bits
753 The following bit masks can be used to set options:
754 - \ref osThreadDetached : create thread in a detached mode (default).
755 - \ref osThreadJoinable : create thread in \ref joinable_threads "joinable mode".
757 \var osThreadAttr_t::cb_mem
759 Pointer to a memory for the thread control block object. Refer to \ref StaticObjectMemory for more information.
761 Default: \token{NULL} to use \ref CMSIS_RTOS_MemoryMgmt_Automatic for the thread control block.
763 \var osThreadAttr_t::cb_size
765 The size (in bytes) of memory block passed with \ref cb_mem. For RTX, the minimum value is defined with \ref osRtxThreadCbSize (higher values are permitted).
767 Default: \token{0} as the default is no memory provided with \ref cb_mem.
769 \var osThreadAttr_t::name
771 Pointer to a constant string with a human readable name (displayed during debugging) of the thread object.
773 Default: \token{NULL} no name specified (debugger may display function name instead).
775 \var osThreadAttr_t::priority
777 Specifies the initial thread priority with a value from #osPriority_t.
779 Default: \token{osPriorityNormal}.
781 \var osThreadAttr_t::reserved
783 Reserved for future use.
785 \var osThreadAttr_t::stack_mem
787 Pointer to a memory location for the thread stack (64-bit aligned).
789 Default: \token{NULL} to allocate stack from a fixed-size memory pool using \ref ThreadStack.
791 \var osThreadAttr_t::stack_size
793 The size (in bytes) of the stack specified by \ref stack_mem.
795 Default: \token{0} as the default is no memory provided with \ref stack_mem.
797 \var osThreadAttr_t::tz_module
799 TrustZone Thread Context Management Identifier to allocate context memory for threads. The RTOS kernel that runs in
800 non-secure state calls the interface functions defined by the header file TZ_context.h. Can safely be set to zero
801 for threads not using secure calls at all.
802 See <a href="../../Core/html/group__context__trustzone__functions.html">TrustZone RTOS Context Management</a>.
804 Default: token{0} not thread context specified.