Lee Kai Xuan
mbed-os
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Diff: rtos/Thread.h
- Revision:
- 0:f269e3021894
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/rtos/Thread.h Sun Oct 23 15:10:02 2016 +0000
@@ -0,0 +1,355 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2012 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 THREAD_H
+#define THREAD_H
+
+#include <stdint.h>
+#include "cmsis_os.h"
+#include "platform/Callback.h"
+#include "platform/toolchain.h"
+#include "rtos/Semaphore.h"
+#include "rtos/Mutex.h"
+
+namespace rtos {
+/** \addtogroup rtos */
+/** @{*/
+
+/** The Thread class allow defining, creating, and controlling thread functions in the system.
+ *
+ * Example:
+ * @code
+ * #include "mbed.h"
+ * #include "rtos.h"
+ *
+ * Thread thread;
+ * DigitalOut led1(LED1);
+ * volatile bool running = true;
+ *
+ * // Blink function toggles the led in a long running loop
+ * void blink(DigitalOut *led) {
+ * while (running) {
+ * *led = !*led;
+ * Thread::wait(1000);
+ * }
+ * }
+ *
+ * // Spawns a thread to run blink for 5 seconds
+ * int main() {
+ * thread.start(led1, blink);
+ * Thread::wait(5000);
+ * running = false;
+ * thread.join();
+ * }
+ * @endcode
+ */
+class Thread {
+public:
+ /** Allocate a new thread without starting execution
+ @param priority initial priority of the thread function. (default: osPriorityNormal).
+ @param stack_size stack size (in bytes) requirements for the thread function. (default: DEFAULT_STACK_SIZE).
+ @param stack_pointer pointer to the stack area to be used by this thread (default: NULL).
+ */
+ Thread(osPriority priority=osPriorityNormal,
+ uint32_t stack_size=DEFAULT_STACK_SIZE,
+ unsigned char *stack_pointer=NULL) {
+ constructor(priority, stack_size, stack_pointer);
+ }
+
+ /** Create a new thread, and start it executing the specified function.
+ @param task function to be executed by this thread.
+ @param argument pointer that is passed to the thread function as start argument. (default: NULL).
+ @param priority initial priority of the thread function. (default: osPriorityNormal).
+ @param stack_size stack size (in bytes) requirements for the thread function. (default: DEFAULT_STACK_SIZE).
+ @param stack_pointer pointer to the stack area to be used by this thread (default: NULL).
+ @deprecated
+ Thread-spawning constructors hide errors. Replaced by thread.start(task).
+
+ @code
+ Thread thread(priority, stack_size, stack_pointer);
+
+ osStatus status = thread.start(task);
+ if (status != osOK) {
+ error("oh no!");
+ }
+ @endcode
+ */
+ MBED_DEPRECATED_SINCE("mbed-os-5.1",
+ "Thread-spawning constructors hide errors. "
+ "Replaced by thread.start(task).")
+ Thread(mbed::Callback<void()> task,
+ osPriority priority=osPriorityNormal,
+ uint32_t stack_size=DEFAULT_STACK_SIZE,
+ unsigned char *stack_pointer=NULL) {
+ constructor(task, priority, stack_size, stack_pointer);
+ }
+
+ /** Create a new thread, and start it executing the specified function.
+ @param obj argument to task.
+ @param method function to be executed by this thread.
+ @param argument pointer that is passed to the thread function as start argument. (default: NULL).
+ @param priority initial priority of the thread function. (default: osPriorityNormal).
+ @param stack_size stack size (in bytes) requirements for the thread function. (default: DEFAULT_STACK_SIZE).
+ @param stack_pointer pointer to the stack area to be used by this thread (default: NULL).
+ @deprecated
+ Thread-spawning constructors hide errors. Replaced by thread.start(callback(task, argument)).
+
+ @code
+ Thread thread(priority, stack_size, stack_pointer);
+
+ osStatus status = thread.start(callback(task, argument));
+ if (status != osOK) {
+ error("oh no!");
+ }
+ @endcode
+ */
+ template <typename T>
+ MBED_DEPRECATED_SINCE("mbed-os-5.1",
+ "Thread-spawning constructors hide errors. "
+ "Replaced by thread.start(callback(task, argument)).")
+ Thread(T *argument, void (T::*task)(),
+ osPriority priority=osPriorityNormal,
+ uint32_t stack_size=DEFAULT_STACK_SIZE,
+ unsigned char *stack_pointer=NULL) {
+ constructor(mbed::callback(task, argument),
+ priority, stack_size, stack_pointer);
+ }
+
+ /** Create a new thread, and start it executing the specified function.
+ @param obj argument to task.
+ @param method function to be executed by this thread.
+ @param argument pointer that is passed to the thread function as start argument. (default: NULL).
+ @param priority initial priority of the thread function. (default: osPriorityNormal).
+ @param stack_size stack size (in bytes) requirements for the thread function. (default: DEFAULT_STACK_SIZE).
+ @param stack_pointer pointer to the stack area to be used by this thread (default: NULL).
+ @deprecated
+ Thread-spawning constructors hide errors. Replaced by thread.start(callback(task, argument)).
+
+ @code
+ Thread thread(priority, stack_size, stack_pointer);
+
+ osStatus status = thread.start(callback(task, argument));
+ if (status != osOK) {
+ error("oh no!");
+ }
+ @endcode
+ */
+ template <typename T>
+ MBED_DEPRECATED_SINCE("mbed-os-5.1",
+ "Thread-spawning constructors hide errors. "
+ "Replaced by thread.start(callback(task, argument)).")
+ Thread(T *argument, void (*task)(T *),
+ osPriority priority=osPriorityNormal,
+ uint32_t stack_size=DEFAULT_STACK_SIZE,
+ unsigned char *stack_pointer=NULL) {
+ constructor(mbed::callback(task, argument),
+ priority, stack_size, stack_pointer);
+ }
+
+ /** Create a new thread, and start it executing the specified function.
+ Provided for backwards compatibility
+ @param task function to be executed by this thread.
+ @param argument pointer that is passed to the thread function as start argument. (default: NULL).
+ @param priority initial priority of the thread function. (default: osPriorityNormal).
+ @param stack_size stack size (in bytes) requirements for the thread function. (default: DEFAULT_STACK_SIZE).
+ @param stack_pointer pointer to the stack area to be used by this thread (default: NULL).
+ @deprecated
+ Thread-spawning constructors hide errors. Replaced by thread.start(callback(task, argument)).
+
+ @code
+ Thread thread(priority, stack_size, stack_pointer);
+
+ osStatus status = thread.start(callback(task, argument));
+ if (status != osOK) {
+ error("oh no!");
+ }
+ @endcode
+ */
+ MBED_DEPRECATED_SINCE("mbed-os-5.1",
+ "Thread-spawning constructors hide errors. "
+ "Replaced by thread.start(callback(task, argument)).")
+ Thread(void (*task)(void const *argument), void *argument=NULL,
+ osPriority priority=osPriorityNormal,
+ uint32_t stack_size=DEFAULT_STACK_SIZE,
+ unsigned char *stack_pointer=NULL) {
+ constructor(mbed::callback((void (*)(void *))task, argument),
+ priority, stack_size, stack_pointer);
+ }
+
+ /** Starts a thread executing the specified function.
+ @param task function to be executed by this thread.
+ @return status code that indicates the execution status of the function.
+ */
+ osStatus start(mbed::Callback<void()> task);
+
+ /** Starts a thread executing the specified function.
+ @param obj argument to task
+ @param method function to be executed by this thread.
+ @return status code that indicates the execution status of the function.
+ @deprecated
+ The start function does not support cv-qualifiers. Replaced by start(callback(obj, method)).
+ */
+ template <typename T, typename M>
+ MBED_DEPRECATED_SINCE("mbed-os-5.1",
+ "The start function does not support cv-qualifiers. "
+ "Replaced by thread.start(callback(obj, method)).")
+ osStatus start(T *obj, M method) {
+ return start(mbed::callback(obj, method));
+ }
+
+ /** Wait for thread to terminate
+ @return status code that indicates the execution status of the function.
+ @note not callable from interrupt
+ */
+ osStatus join();
+
+ /** Terminate execution of a thread and remove it from Active Threads
+ @return status code that indicates the execution status of the function.
+ */
+ osStatus terminate();
+
+ /** Set priority of an active thread
+ @param priority new priority value for the thread function.
+ @return status code that indicates the execution status of the function.
+ */
+ osStatus set_priority(osPriority priority);
+
+ /** Get priority of an active thread
+ @return current priority value of the thread function.
+ */
+ osPriority get_priority();
+
+ /** Set the specified Signal Flags of an active thread.
+ @param 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.
+ */
+ int32_t signal_set(int32_t signals);
+
+ /** Clears the specified Signal Flags of an active thread.
+ @param signals specifies the signal flags of the thread that should be cleared.
+ @return resultant signal flags of the specified thread or 0x80000000 in case of incorrect parameters.
+ */
+ int32_t signal_clr(int32_t signals);
+
+ /** State of the Thread */
+ enum State {
+ Inactive, /**< Not created or terminated */
+ Ready, /**< Ready to run */
+ Running, /**< Running */
+ WaitingDelay, /**< Waiting for a delay to occur */
+ WaitingInterval, /**< Waiting for an interval to occur */
+ WaitingOr, /**< Waiting for one event in a set to occur */
+ WaitingAnd, /**< Waiting for multiple events in a set to occur */
+ WaitingSemaphore, /**< Waiting for a semaphore event to occur */
+ WaitingMailbox, /**< Waiting for a mailbox event to occur */
+ WaitingMutex, /**< Waiting for a mutex event to occur */
+
+ /* Not in sync with RTX below here */
+ Deleted, /**< The task has been deleted */
+ };
+
+ /** State of this Thread
+ @return the State of this Thread
+ */
+ State get_state();
+
+ /** Get the total stack memory size for this Thread
+ @return the total stack memory size in bytes
+ */
+ uint32_t stack_size();
+
+ /** Get the currently unused stack memory for this Thread
+ @return the currently unused stack memory in bytes
+ */
+ uint32_t free_stack();
+
+ /** Get the currently used stack memory for this Thread
+ @return the currently used stack memory in bytes
+ */
+ uint32_t used_stack();
+
+ /** Get the maximum stack memory usage to date for this Thread
+ @return the maximum stack memory usage to date in bytes
+ */
+ uint32_t max_stack();
+
+ /** Wait for one or more Signal Flags to become signaled for the current RUNNING thread.
+ @param signals wait until all specified signal flags set or 0 for any single signal flag.
+ @param millisec timeout value or 0 in case of no time-out. (default: osWaitForever).
+ @return event flag information or error code.
+ @note not callable from interrupt
+ */
+ static osEvent signal_wait(int32_t signals, uint32_t millisec=osWaitForever);
+
+ /** Wait for a specified time period in millisec:
+ @param millisec time delay value
+ @return status code that indicates the execution status of the function.
+ @note not callable from interrupt
+ */
+ static osStatus wait(uint32_t millisec);
+
+ /** Pass control to next thread that is in state READY.
+ @return status code that indicates the execution status of the function.
+ @note not callable from interrupt
+ */
+ static osStatus yield();
+
+ /** Get the thread id of the current running thread.
+ @return thread ID for reference by other functions or NULL in case of error.
+ */
+ static osThreadId gettid();
+
+ /** Attach a function to be called by the RTOS idle task
+ @param fptr pointer to the function to be called
+ */
+ static void attach_idle_hook(void (*fptr)(void));
+
+ /** Attach a function to be called when a task is killed
+ @param fptr pointer to the function to be called
+ */
+ static void attach_terminate_hook(void (*fptr)(osThreadId id));
+
+ virtual ~Thread();
+
+private:
+ // Required to share definitions without
+ // delegated constructors
+ void constructor(osPriority priority=osPriorityNormal,
+ uint32_t stack_size=DEFAULT_STACK_SIZE,
+ unsigned char *stack_pointer=NULL);
+ void constructor(mbed::Callback<void()> task,
+ osPriority priority=osPriorityNormal,
+ uint32_t stack_size=DEFAULT_STACK_SIZE,
+ unsigned char *stack_pointer=NULL);
+ static void _thunk(const void * thread_ptr);
+
+ mbed::Callback<void()> _task;
+ osThreadId _tid;
+ osThreadDef_t _thread_def;
+ bool _dynamic_stack;
+ Semaphore _join_sem;
+ Mutex _mutex;
+};
+
+}
+#endif
+
+/** @}*/