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micropython/stmhal/pybthread.h

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stmhal: Initial implementation of multithreading, currently disabled. This patch brings the _thread module to stmhal/pyboard. There is a very simple round-robin thread scheduler, which is disabled if there is only one thread (for efficiency when threading is not used). The scheduler currently switches threads at a rate of 250Hz using the systick timer and the pend-SV interrupt. The GIL is disabled so one must be careful to use lock objects to prevent concurrent access of objects. The threading is disabled by default, one can enabled it with the config option MICROPY_PY_THREAD to test it out.
2017-01-31 02:59:53 +00:00
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2017 Damien P. George
*
* 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 MICROPY_INCLUDED_STMHAL_PYBTHREAD_H
#define MICROPY_INCLUDED_STMHAL_PYBTHREAD_H
typedef struct _pyb_thread_t {
void *sp;
uint32_t local_state;
void *arg; // thread Python args, a GC root pointer
void *stack; // pointer to the stack
size_t stack_len; // number of words in the stack
stmhal: Implement a proper thread scheduler. This patch changes the threading implementation from simple round-robin with busy waits on mutexs, to proper scheduling whereby threads that are waiting on a mutex are only scheduled when the mutex becomes available.
2017-02-06 04:13:30 +00:00
uint32_t timeslice;
struct _pyb_thread_t *all_next;
struct _pyb_thread_t *run_prev;
struct _pyb_thread_t *run_next;
struct _pyb_thread_t *queue_next;
stmhal: Initial implementation of multithreading, currently disabled. This patch brings the _thread module to stmhal/pyboard. There is a very simple round-robin thread scheduler, which is disabled if there is only one thread (for efficiency when threading is not used). The scheduler currently switches threads at a rate of 250Hz using the systick timer and the pend-SV interrupt. The GIL is disabled so one must be careful to use lock objects to prevent concurrent access of objects. The threading is disabled by default, one can enabled it with the config option MICROPY_PY_THREAD to test it out.
2017-01-31 02:59:53 +00:00
} pyb_thread_t;
stmhal: Implement a proper thread scheduler. This patch changes the threading implementation from simple round-robin with busy waits on mutexs, to proper scheduling whereby threads that are waiting on a mutex are only scheduled when the mutex becomes available.
2017-02-06 04:13:30 +00:00
typedef pyb_thread_t *pyb_mutex_t;
extern volatile int pyb_thread_enabled;
extern pyb_thread_t *volatile pyb_thread_all;
extern pyb_thread_t *volatile pyb_thread_cur;
stmhal: Initial implementation of multithreading, currently disabled. This patch brings the _thread module to stmhal/pyboard. There is a very simple round-robin thread scheduler, which is disabled if there is only one thread (for efficiency when threading is not used). The scheduler currently switches threads at a rate of 250Hz using the systick timer and the pend-SV interrupt. The GIL is disabled so one must be careful to use lock objects to prevent concurrent access of objects. The threading is disabled by default, one can enabled it with the config option MICROPY_PY_THREAD to test it out.
2017-01-31 02:59:53 +00:00
void pyb_thread_init(pyb_thread_t *th);
stmhal: Implement a proper thread scheduler. This patch changes the threading implementation from simple round-robin with busy waits on mutexs, to proper scheduling whereby threads that are waiting on a mutex are only scheduled when the mutex becomes available.
2017-02-06 04:13:30 +00:00
void pyb_thread_deinit();
stmhal: Initial implementation of multithreading, currently disabled. This patch brings the _thread module to stmhal/pyboard. There is a very simple round-robin thread scheduler, which is disabled if there is only one thread (for efficiency when threading is not used). The scheduler currently switches threads at a rate of 250Hz using the systick timer and the pend-SV interrupt. The GIL is disabled so one must be careful to use lock objects to prevent concurrent access of objects. The threading is disabled by default, one can enabled it with the config option MICROPY_PY_THREAD to test it out.
2017-01-31 02:59:53 +00:00
uint32_t pyb_thread_new(pyb_thread_t *th, void *stack, size_t stack_len, void *entry, void *arg);
stmhal: Implement a proper thread scheduler. This patch changes the threading implementation from simple round-robin with busy waits on mutexs, to proper scheduling whereby threads that are waiting on a mutex are only scheduled when the mutex becomes available.
2017-02-06 04:13:30 +00:00
void pyb_thread_dump(void);
stmhal: Initial implementation of multithreading, currently disabled. This patch brings the _thread module to stmhal/pyboard. There is a very simple round-robin thread scheduler, which is disabled if there is only one thread (for efficiency when threading is not used). The scheduler currently switches threads at a rate of 250Hz using the systick timer and the pend-SV interrupt. The GIL is disabled so one must be careful to use lock objects to prevent concurrent access of objects. The threading is disabled by default, one can enabled it with the config option MICROPY_PY_THREAD to test it out.
2017-01-31 02:59:53 +00:00
static inline uint32_t pyb_thread_get_id(void) {
return (uint32_t)pyb_thread_cur;
}
static inline void pyb_thread_set_local(void *value) {
pyb_thread_cur->local_state = (uint32_t)value;
}
static inline void *pyb_thread_get_local(void) {
return (void*)pyb_thread_cur->local_state;
}
static inline void pyb_thread_yield(void) {
stmhal: Implement a proper thread scheduler. This patch changes the threading implementation from simple round-robin with busy waits on mutexs, to proper scheduling whereby threads that are waiting on a mutex are only scheduled when the mutex becomes available.
2017-02-06 04:13:30 +00:00
if (pyb_thread_cur->run_next == pyb_thread_cur) {
__WFI();
} else {
SCB->ICSR = SCB_ICSR_PENDSVSET_Msk;
}
stmhal: Initial implementation of multithreading, currently disabled. This patch brings the _thread module to stmhal/pyboard. There is a very simple round-robin thread scheduler, which is disabled if there is only one thread (for efficiency when threading is not used). The scheduler currently switches threads at a rate of 250Hz using the systick timer and the pend-SV interrupt. The GIL is disabled so one must be careful to use lock objects to prevent concurrent access of objects. The threading is disabled by default, one can enabled it with the config option MICROPY_PY_THREAD to test it out.
2017-01-31 02:59:53 +00:00
}
stmhal: Implement a proper thread scheduler. This patch changes the threading implementation from simple round-robin with busy waits on mutexs, to proper scheduling whereby threads that are waiting on a mutex are only scheduled when the mutex becomes available.
2017-02-06 04:13:30 +00:00
void pyb_mutex_init(pyb_mutex_t *m);
int pyb_mutex_lock(pyb_mutex_t *m, int wait);
void pyb_mutex_unlock(pyb_mutex_t *m);
stmhal: Initial implementation of multithreading, currently disabled. This patch brings the _thread module to stmhal/pyboard. There is a very simple round-robin thread scheduler, which is disabled if there is only one thread (for efficiency when threading is not used). The scheduler currently switches threads at a rate of 250Hz using the systick timer and the pend-SV interrupt. The GIL is disabled so one must be careful to use lock objects to prevent concurrent access of objects. The threading is disabled by default, one can enabled it with the config option MICROPY_PY_THREAD to test it out.
2017-01-31 02:59:53 +00:00
#endif // MICROPY_INCLUDED_STMHAL_PYBTHREAD_H