thread_flags.c
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/*
* Copyright (C) 2016 Kaspar Schleiser <kaspar@schleiser.de>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup core_thread
* @{
*
* @file
* @brief thread flags implementation
*
* @author Kaspar Schleiser <kaspar@schleiser.de>
*
* @}
*/
#include "thread_flags.h"
#include "irq.h"
#include "thread.h"
#define ENABLE_DEBUG (0)
#include "debug.h"
static thread_flags_t _thread_flags_clear_atomic(thread_t *thread, thread_flags_t mask)
{
unsigned state = irq_disable();
mask &= thread->flags;
thread->flags &= ~mask;
irq_restore(state);
return mask;
}
static void _thread_flags_wait(thread_flags_t mask, thread_t *thread, unsigned threadstate, unsigned irqstate)
{
DEBUG("_thread_flags_wait: me->flags=0x%08x me->mask=0x%08x. going blocked.\n",
(unsigned)thread->flags, (unsigned)mask);
thread->wait_data = (void *)(unsigned)mask;
sched_set_status(thread, threadstate);
irq_restore(irqstate);
thread_yield_higher();
}
thread_flags_t thread_flags_clear(thread_flags_t mask)
{
thread_t *me = (thread_t*) sched_active_thread;
mask = _thread_flags_clear_atomic(me, mask);
DEBUG("thread_flags_clear(): pid %"PRIkernel_pid" clearing 0x%08x\n", thread_getpid(), mask);
return mask;
}
static void _thread_flags_wait_any(thread_flags_t mask)
{
thread_t *me = (thread_t*) sched_active_thread;
unsigned state = irq_disable();
if (!(me->flags & mask)) {
_thread_flags_wait(mask, me, STATUS_FLAG_BLOCKED_ANY, state);
}
else {
irq_restore(state);
}
}
thread_flags_t thread_flags_wait_any(thread_flags_t mask)
{
thread_t *me = (thread_t*) sched_active_thread;
_thread_flags_wait_any(mask);
return _thread_flags_clear_atomic(me, mask);
}
thread_flags_t thread_flags_wait_one(thread_flags_t mask)
{
_thread_flags_wait_any(mask);
thread_t *me = (thread_t*) sched_active_thread;
thread_flags_t tmp = me->flags & mask;
/* clear all but least significant bit */
tmp &= (~tmp + 1);
return _thread_flags_clear_atomic(me, tmp);
}
thread_flags_t thread_flags_wait_all(thread_flags_t mask)
{
unsigned state = irq_disable();
thread_t *me = (thread_t*) sched_active_thread;
if (!((me->flags & mask) == mask)) {
DEBUG("thread_flags_wait_all(): pid %"PRIkernel_pid" waiting for %08x\n", thread_getpid(), (unsigned)mask);
_thread_flags_wait(mask, me, STATUS_FLAG_BLOCKED_ALL, state);
}
else {
irq_restore(state);
}
return _thread_flags_clear_atomic(me, mask);
}
inline int __attribute__((always_inline)) thread_flags_wake(thread_t *thread)
{
unsigned wakeup = 0;
thread_flags_t mask = (uint16_t)(unsigned)thread->wait_data;
switch(thread->status) {
case STATUS_FLAG_BLOCKED_ANY:
wakeup = (thread->flags & mask);
break;
case STATUS_FLAG_BLOCKED_ALL:
wakeup = ((thread->flags & mask) == mask);
break;
}
if (wakeup) {
DEBUG("_thread_flags_wake(): waking up pid %"PRIkernel_pid"\n", thread->pid);
sched_set_status(thread, STATUS_PENDING);
sched_context_switch_request = 1;
}
return wakeup;
}
void thread_flags_set(thread_t *thread, thread_flags_t mask)
{
DEBUG("thread_flags_set(): setting 0x%08x for pid %"PRIkernel_pid"\n", mask, thread->pid);
unsigned state = irq_disable();
thread->flags |= mask;
if (thread_flags_wake(thread)) {
irq_restore(state);
thread_yield_higher();
}
else {
irq_restore(state);
}
}