Mbed OS Reference | ThisThread.h Source File

 /* mbed Microcontroller Library
  * Copyright (c) 2006-2019 ARM Limited
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE.
  */
 #ifndef THIS_THREAD_H
 #define THIS_THREAD_H
 
 #include <stdint.h>
 #include "rtos/mbed_rtos_types.h"
 
 namespace rtos {
 /** \addtogroup rtos-public-api */
 /** @{*/
 
 /**
  * \defgroup rtos_ThisThread ThisThread namespace
  * @{
  */
 
 /** The ThisThread namespace allows controlling the current thread.
  *
  *  Example:
  *  @code
  *  #include "mbed.h"
  *  #include "rtos.h"
  *
  *  Thread thread;
  *  DigitalOut led1(LED1);
  *
  *  #define STOP_FLAG 1
  *
  *  // Blink function toggles the led in a long running loop
  *  void blink(DigitalOut *led) {
  *      while (!ThisThread::flags_wait_any_for(STOP_FLAG, 1000)) {
  *          *led = !*led;
  *      }
  *  }
  *
  *  // Spawns a thread to run blink for 5 seconds
  *  int main() {
  *      thread.start(callback(blink, &led1));
  *      ThisThread::sleep_for(5000);
  *      thread.signal_set(STOP_FLAG);
  *      thread.join();
  *  }
  *  @endcode
  *
  */
 namespace ThisThread {
 /** Clears the specified Thread Flags of the currently running thread.
   @param   flags  specifies the flags of the thread that should be cleared.
   @return  thread flags before clearing.
   @note You cannot call this function from ISR context.
   @see Thread::flags_set
 */
 uint32_t flags_clear(uint32_t flags);
 
 /** Returns the Thread Flags currently set for the currently running thread.
   @return  current thread flags or 0 if not in a valid thread.
   @note You cannot call this function from ISR context.
   @see Thread::flags_set
 */
 uint32_t flags_get();
 
 /** Wait for all of the specified Thread Flags to become signaled for the current thread.
   @param   flags     specifies the flags to wait for
   @param   clear     whether to clear the specified flags after waiting for them. (default: true)
   @return  actual thread flags before clearing, which will satisfy the wait
   @note You cannot call this function from ISR context.
   @see Thread::flags_set
 */
 uint32_t flags_wait_all(uint32_t flags, bool clear = true);
 
 /** Wait for any of the specified Thread Flags to become signaled for the current thread.
   @param   flags     specifies the flags to wait for
   @param   clear     whether to clear the specified flags after waiting for them. (default: true)
   @return  actual thread flags before clearing, which will satisfy the wait
   @note You cannot call this function from ISR context.
   @see Thread::flags_set
 */
 uint32_t flags_wait_any(uint32_t flags, bool clear = true);
 
 /** Wait for all of the specified Thread Flags to become signaled for the current thread.
   @param   flags     specifies the flags to wait for
   @param   millisec  timeout value.
   @param   clear     whether to clear the specified flags after waiting for them. (default: true)
   @return  actual thread flags before clearing, which may not satisfy the wait
   @note You cannot call this function from ISR context.
   @see Thread::flags_set
 */
 uint32_t flags_wait_all_for(uint32_t flags, uint32_t millisec, bool clear = true);
 
 /** Wait for all of the specified Thread Flags to become signaled for the current thread.
   @param   flags     specifies the flags to wait for
   @param   millisec  absolute timeout time, referenced to Kernel::get_ms_count()
   @param   clear     whether to clear the specified flags after waiting for them. (default: true)
   @return  actual thread flags before clearing, which may not satisfy the wait
   @note You cannot call this function from ISR context.
   @note the underlying RTOS may have a limit to the maximum wait time
         due to internal 32-bit computations, but this is guaranteed to work if the
         wait is <= 0x7fffffff milliseconds (~24 days). If the limit is exceeded,
         the wait will time out earlier than specified.
   @see Thread::flags_set
 */
 uint32_t flags_wait_all_until(uint32_t flags, uint64_t millisec, bool clear = true);
 
 /** Wait for any of the specified Thread Flags to become signaled for the current thread.
   @param   flags     specifies the flags to wait for
   @param   millisec  timeout value.
   @param   clear     whether to clear the specified flags after waiting for them. (default: true)
   @return  actual thread flags before clearing, which may not satisfy the wait
   @note You cannot call this function from ISR context.
   @see Thread::flags_set
 */
 uint32_t flags_wait_any_for(uint32_t flags, uint32_t millisec, bool clear = true);
 
 /** Wait for any of the specified Thread Flags to become signaled for the current thread.
   @param   flags     specifies the flags to wait for
   @param   millisec  absolute timeout time, referenced to Kernel::get_ms_count()
   @param   clear     whether to clear the specified flags after waiting for them. (default: true)
   @return  actual thread flags before clearing, which may not satisfy the wait
   @note You cannot call this function from ISR context.
   @note the underlying RTOS may have a limit to the maximum wait time
         due to internal 32-bit computations, but this is guaranteed to work if the
           wait is <= 0x7fffffff milliseconds (~24 days). If the limit is exceeded,
           the wait will time out earlier than specified.
   @see Thread::flags_set
 */
 uint32_t flags_wait_any_until(uint32_t flags, uint64_t millisec, bool clear = true);
 
 /** Sleep for a specified time period in millisec:
   @param   millisec  time delay value
   @note You cannot call this function from ISR context.
   @note The equivalent functionality is accessible in C via thread_sleep_for.
 */
 void sleep_for(uint32_t millisec);
 
 /** Sleep until a specified time in millisec
   The specified time is according to Kernel::get_ms_count().
   @param   millisec absolute time in millisec
   @note You cannot call this function from ISR context.
   @note if millisec is equal to or lower than the current tick count, this
         returns immediately.
   @note The equivalent functionality is accessible in C via thread_sleep_until.
 */
 void sleep_until(uint64_t millisec);
 
 /** Pass control to next equal-priority thread that is in state READY.
     (Higher-priority READY threads would prevent us from running; this
     will not enable lower-priority threads to run, as we remain READY).
     @note You cannot call this function from ISR context.
 */
 void yield();
 
 /** Get the thread id of the current running thread.
   @return  thread ID for reference by other functions or nullptr in case of error or in ISR context.
   @note You may call this function from ISR context.
 */
 osThreadId_t get_id();
 
 /** Get the thread name of the current running thread.
   @return  thread name pointer or nullptr if thread has no name or in case of error.
   @note You cannot call this function from ISR context.
 */
 const char *get_name();
 
 };
 /** @}*/
 /** @}*/
 
 
 namespace internal {
 /** \addtogroup rtos-internal-api */
 /** @{*/
 
 struct flags_check_capture {
     uint32_t *flags;
     uint32_t options;
     uint32_t flags_wanted;
     uint32_t result;
     bool match;
 };
 
 bool non_rtos_check_flags(void *handle);
 
 }
 /** @}*/
 }
 #endif
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