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* SPDX-License-Identifier: Apache-2.0

* Change Logs:

* Date Author Notes

* 2017/10/5 Bernard the first version

* 2018/09/17 Jesven fix: in _signal_deliver RT_THREAD_STAT_MASK to RT_THREAD_STAT_SIGNAL_MASK

* 2018/11/22 Jesven in smp version rt_hw_context_switch_to add a param

#include <stdint.h>

#include <string.h>

#include <rthw.h>

#include <rtthread.h>

#ifdef RT_USING_SIGNALS

#ifndef RT_SIG_INFO_MAX

#ifdef ARCH_CPU_64BIT

#define RT_SIG_INFO_MAX 64

#else

#define RT_SIG_INFO_MAX 32

#endif /* ARCH_CPU_64BIT */

#endif /* RT_SIG_INFO_MAX */

#define DBG_TAG "SIGN"

#define DBG_LVL DBG_WARNING

#include <rtdbg.h>

#ifdef RT_USING_MUSLLIBC

#define sig_mask(sig_no) (1u << (sig_no - 1))

#else

#define sig_mask(sig_no) (1u << sig_no)

#endif

#define sig_valid(sig_no) (sig_no >= 0 && sig_no < RT_SIG_MAX)

static struct rt_spinlock _thread_signal_lock = RT_SPINLOCK_INIT;

struct siginfo_node

{

siginfo_t si;

struct rt_slist_node list;

};

static struct rt_mempool *_siginfo_pool;

static void _signal_deliver(rt_thread_t tid);

void rt_thread_handle_sig(rt_bool_t clean_state);

static void _signal_default_handler(int signo)

{

RT_UNUSED(signo);

LOG_I("handled signo[%d] with default action.", signo);

return;

}

static void _signal_entry(void *parameter)

{

RT_UNUSED(parameter);

rt_thread_t tid = rt_thread_self();

/* handle signal */

rt_thread_handle_sig(RT_FALSE);

#ifdef RT_USING_SMP

#else

/* return to thread */

tid->sp = tid->sig_ret;

tid->sig_ret = RT_NULL;

#endif /* RT_USING_SMP */

LOG_D("switch back to: 0x%08x\n", tid->sp);

RT_SCHED_CTX(tid).stat &= ~RT_THREAD_STAT_SIGNAL;

#ifdef RT_USING_SMP

rt_hw_context_switch_to((rt_uintptr_t)&parameter, tid);

#else

rt_hw_context_switch_to((rt_uintptr_t) & (tid->sp));

#endif /* RT_USING_SMP */

}

* To deliver a signal to thread, there are cases:

* 1. When thread is suspended, function resumes thread and

* set signal stat;

* 2. When thread is ready:

* - If function delivers a signal to self thread, just handle

* it.

* - If function delivers a signal to another ready thread, OS

* should build a slice context to handle it.

static void _signal_deliver(rt_thread_t tid)

{

rt_base_t level;

level = rt_spin_lock_irqsave(&_thread_signal_lock);

/* thread is not interested in pended signals */

if (!(tid->sig_pending & tid->sig_mask))

{

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

return;

}

if ((RT_SCHED_CTX(tid).stat & RT_THREAD_SUSPEND_MASK) == RT_THREAD_SUSPEND_MASK)

{

/* resume thread to handle signal */

#ifdef RT_USING_SMART

rt_thread_wakeup(tid);

#else

rt_thread_resume(tid);

#endif

/* add signal state */

RT_SCHED_CTX(tid).stat |= (RT_THREAD_STAT_SIGNAL | RT_THREAD_STAT_SIGNAL_PENDING);

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

/* re-schedule */

rt_schedule();

}

else

{

if (tid == rt_thread_self())

{

/* add signal state */

RT_SCHED_CTX(tid).stat |= RT_THREAD_STAT_SIGNAL;

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

/* do signal action in self thread context */

if (rt_interrupt_get_nest() == 0)

{

rt_thread_handle_sig(RT_TRUE);

}

else if (!((RT_SCHED_CTX(tid).stat & RT_THREAD_STAT_SIGNAL_MASK) & RT_THREAD_STAT_SIGNAL))

{

/* add signal state */

RT_SCHED_CTX(tid).stat |= (RT_THREAD_STAT_SIGNAL | RT_THREAD_STAT_SIGNAL_PENDING);

#ifdef RT_USING_SMP

{

int cpu_id;

cpu_id = RT_SCHED_CTX(tid).oncpu;

if ((cpu_id != RT_CPU_DETACHED) && (cpu_id != rt_cpu_get_id()))

{

rt_uint32_t cpu_mask;

cpu_mask = RT_CPU_MASK ^ (1 << cpu_id);

rt_hw_ipi_send(RT_SCHEDULE_IPI, cpu_mask);

}

#else

/* point to the signal handle entry */

RT_SCHED_CTX(tid).stat &= ~RT_THREAD_STAT_SIGNAL_PENDING;

tid->sig_ret = tid->sp;

tid->sp = rt_hw_stack_init((void *)_signal_entry, RT_NULL,

(void *)((char *)tid->sig_ret - 32), RT_NULL);

#endif /* RT_USING_SMP */

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

LOG_D("signal stack pointer @ 0x%08x", tid->sp);

/* re-schedule */

rt_schedule();

}

else

{

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

}

#ifdef RT_USING_SMP

void *rt_signal_check(void *context)

{

rt_sched_lock_level_t level;

int cpu_id;

struct rt_cpu *pcpu;

struct rt_thread *current_thread;

level = rt_spin_lock_irqsave(&_thread_signal_lock);

cpu_id = rt_cpu_get_id();

pcpu = rt_cpu_index(cpu_id);

current_thread = pcpu->current_thread;

if (pcpu->irq_nest)

{

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

return context;

}

if (current_thread->cpus_lock_nest == 1)

{

if (RT_SCHED_CTX(current_thread).stat & RT_THREAD_STAT_SIGNAL_PENDING)

{

void *sig_context;

RT_SCHED_CTX(current_thread).stat &= ~RT_THREAD_STAT_SIGNAL_PENDING;

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

sig_context = rt_hw_stack_init((void *)_signal_entry, context,

(void *)((char *)context - 32), RT_NULL);

return sig_context;

}

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

return context;

}

#endif /* RT_USING_SMP */

/**

* @brief This function will install a processing function to a specific

* signal and return the old processing function of this signal.

* @note This function needs to be used in conjunction with the

* rt_signal_unmask() function to make the signal effective.

* @see rt_signal_unmask()

* @param signo is a specific signal value (range: 0 ~ RT_SIG_MAX).

* @param handler is sets the processing of signal value.

* @return Return the old processing function of this signal. ONLY When the

* return value is SIG_ERR, the operation is failed.

rt_sighandler_t rt_signal_install(int signo, rt_sighandler_t handler)

{

rt_base_t level;

rt_sighandler_t old = RT_NULL;

rt_thread_t tid = rt_thread_self();

if (!sig_valid(signo))

{

return SIG_ERR;

}

level = rt_spin_lock_irqsave(&_thread_signal_lock);

if (tid->sig_vectors == RT_NULL)

{

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

rt_thread_alloc_sig(tid);

level = rt_spin_lock_irqsave(&_thread_signal_lock);

}

if (tid->sig_vectors)

{

old = tid->sig_vectors[signo];

if (handler == SIG_IGN)

{

tid->sig_vectors[signo] = RT_NULL;

}

else if (handler == SIG_DFL)

{

tid->sig_vectors[signo] = _signal_default_handler;

}

else

{

tid->sig_vectors[signo] = handler;

}

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

return old;

}

/**

* @brief This function will block the specified signal.

* @note This function will block the specified signal, even if the

* rt_thread_kill() function is called to send this signal to

* the current thread, it will no longer take effect.

* @see rt_thread_kill()

* @param signo is a specific signal value (range: 0 ~ RT_SIG_MAX).

void rt_signal_mask(int signo)

{

rt_base_t level;

rt_thread_t tid = rt_thread_self();

level = rt_spin_lock_irqsave(&_thread_signal_lock);

tid->sig_mask &= ~sig_mask(signo);

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

}

/**

* @brief This function will unblock the specified signal.

* @note This function will unblock the specified signal. After calling

* the rt_thread_kill() function to send this signal to the current

* thread, it will take effect.

* @see rt_thread_kill()

* @param signo is a specific signal value (range: 0 ~ RT_SIG_MAX).

void rt_signal_unmask(int signo)

{

rt_base_t level;

rt_thread_t tid = rt_thread_self();

level = rt_spin_lock_irqsave(&_thread_signal_lock);

tid->sig_mask |= sig_mask(signo);

/* let thread handle pended signals */

if (tid->sig_mask & tid->sig_pending)

{

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

_signal_deliver(tid);

}

else

{

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

}

/**

* @brief This function will wait for the arrival of the set signal. If it does not wait for this signal, the thread will be

* suspended until it waits for this signal or the waiting time exceeds the specified timeout: timeout.

* @param set is the set of signal values to be waited for. Use the function

* sigaddset() to add the signal.

* @param si is a pointer to the received signal info. If you don't care about this value, you can use RT_NULL to set.

* @param timeout is a timeout period (unit: an OS tick).

* @return Return the operation status. When the return value is RT_EOK, the operation is successful.

* If the return value is any other values, it means that the signal wait failed.

int rt_signal_wait(const rt_sigset_t *set, rt_siginfo_t *si, rt_int32_t timeout)

{

int ret = RT_EOK;

rt_base_t level;

rt_thread_t tid = rt_thread_self();

struct siginfo_node *si_node = RT_NULL, *si_prev = RT_NULL;

/* current context checking */

RT_DEBUG_IN_THREAD_CONTEXT;

/* parameters check */

if (set == NULL || *set == 0 || si == NULL)

{

ret = -RT_EINVAL;

goto __done_return;

}

/* clear siginfo to avoid unknown value */

memset(si, 0x0, sizeof(rt_siginfo_t));

level = rt_spin_lock_irqsave(&_thread_signal_lock);

/* already pending */

if (tid->sig_pending & *set)

{

goto __done;

}

if (timeout == 0)

{

ret = -RT_ETIMEOUT;

goto __done_int;

}

/* suspend self thread */

rt_thread_suspend_with_flag(tid, RT_UNINTERRUPTIBLE);

/* set thread stat as waiting for signal */

RT_SCHED_CTX(tid).stat |= RT_THREAD_STAT_SIGNAL_WAIT;

/* start timeout timer */

if (timeout != RT_WAITING_FOREVER)

{

rt_tick_t timeout_tick = timeout;

/* reset the timeout of thread timer and start it */

rt_timer_control(&(tid->thread_timer),

RT_TIMER_CTRL_SET_TIME,

&timeout_tick);

rt_timer_start(&(tid->thread_timer));

}

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

/* do thread scheduling */

rt_schedule();

level = rt_spin_lock_irqsave(&_thread_signal_lock);

/* remove signal waiting flag */

RT_SCHED_CTX(tid).stat &= ~RT_THREAD_STAT_SIGNAL_WAIT;

/* check errno of thread */

if (tid->error == -RT_ETIMEOUT)

{

tid->error = RT_EOK;

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

/* timer timeout */

ret = -RT_ETIMEOUT;

goto __done_return;

}

__done:

/* to get the first matched pending signals */

si_node = (struct siginfo_node *)tid->si_list;

while (si_node)

{

int signo;

signo = si_node->si.si_signo;

if (sig_mask(signo) & *set)

{

*si = si_node->si;

LOG_D("sigwait: %d sig raised!", signo);

if (si_prev)

{

si_prev->list.next = si_node->list.next;

}

else

{

struct siginfo_node *node_next;

if (si_node->list.next)

{

node_next = (void *)rt_slist_entry(si_node->list.next, struct siginfo_node, list);

tid->si_list = node_next;

}

else

{

tid->si_list = RT_NULL;

}

/* clear pending */

tid->sig_pending &= ~sig_mask(signo);

rt_mp_free(si_node);

break;

}

si_prev = si_node;

if (si_node->list.next)

{

si_node = (void *)rt_slist_entry(si_node->list.next, struct siginfo_node, list);

}

else

{

si_node = RT_NULL;

}

__done_int:

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

__done_return:

return ret;

}

void rt_thread_handle_sig(rt_bool_t clean_state)

{

rt_base_t level;

rt_thread_t tid = rt_thread_self();

struct siginfo_node *si_node;

level = rt_spin_lock_irqsave(&_thread_signal_lock);

if (tid->sig_pending & tid->sig_mask)

{

/* if thread is not waiting for signal */

if (!(RT_SCHED_CTX(tid).stat & RT_THREAD_STAT_SIGNAL_WAIT))

{

while (tid->sig_pending & tid->sig_mask)

{

int signo, error;

rt_sighandler_t handler;

si_node = (struct siginfo_node *)tid->si_list;

if (!si_node)

{

break;

}

/* remove this sig info node from list */

if (si_node->list.next == RT_NULL)

{

tid->si_list = RT_NULL;

}

else

{

tid->si_list = (void *)rt_slist_entry(si_node->list.next, struct siginfo_node, list);

}

signo = si_node->si.si_signo;

handler = tid->sig_vectors[signo];

tid->sig_pending &= ~sig_mask(signo);

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

LOG_D("handle signal: %d, handler 0x%08x", signo, handler);

if (handler)

{

handler(signo);

}

level = rt_spin_lock_irqsave(&_thread_signal_lock);

error = -RT_EINTR;

rt_mp_free(si_node); /* release this siginfo node */

/* set errno in thread tcb */

tid->error = error;

}

/* whether clean signal status */

if (clean_state == RT_TRUE)

{

RT_SCHED_CTX(tid).stat &= ~RT_THREAD_STAT_SIGNAL;

}

else

{

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

return;

}

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

}

void rt_thread_alloc_sig(rt_thread_t tid)

{

int index;

rt_bool_t need_free = RT_FALSE;

rt_base_t level;

rt_sighandler_t *vectors;

vectors = (rt_sighandler_t *)RT_KERNEL_MALLOC(sizeof(rt_sighandler_t) * RT_SIG_MAX);

RT_ASSERT(vectors != RT_NULL);

for (index = 0; index < RT_SIG_MAX; index++)

{

vectors[index] = _signal_default_handler;

}

level = rt_spin_lock_irqsave(&_thread_signal_lock);

if (tid->sig_vectors == RT_NULL)

{

tid->sig_vectors = vectors;

}

else

{

need_free = RT_TRUE;

}

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

if (need_free)

{

rt_free(vectors);

}

void rt_thread_free_sig(rt_thread_t tid)

{

rt_base_t level;

struct siginfo_node *si_node;

rt_sighandler_t *sig_vectors;

level = rt_spin_lock_irqsave(&_thread_signal_lock);

si_node = (struct siginfo_node *)tid->si_list;

tid->si_list = RT_NULL;

sig_vectors = tid->sig_vectors;

tid->sig_vectors = RT_NULL;

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

if (si_node)

{

struct rt_slist_node *node;

struct rt_slist_node *node_to_free;

LOG_D("free signal info list");

node = &(si_node->list);

{

node_to_free = node;

node = node->next;

si_node = rt_slist_entry(node_to_free, struct siginfo_node, list);

rt_mp_free(si_node);

} while (node);

}

if (sig_vectors)

{

RT_KERNEL_FREE(sig_vectors);

}

/**

* @ingroup group_thread_management

* @brief This function can be used to send any signal to any thread.

* @param tid is a pointer to the thread that receives the signal.

* @param sig is a specific signal value (range: 0 ~ RT_SIG_MAX).

* @return Return the operation status. When the return value is RT_EOK, the operation is successful.

* If the return value is any other values, it means that the signal send failed.

int rt_thread_kill(rt_thread_t tid, int sig)

{

siginfo_t si;

rt_base_t level;

struct siginfo_node *si_node;

RT_ASSERT(tid != RT_NULL);

if (!sig_valid(sig))

{

return -RT_EINVAL;

}

LOG_I("send signal: %d", sig);

si.si_signo = sig;

si.si_code = SI_USER;

si.si_value.sival_ptr = RT_NULL;

level = rt_spin_lock_irqsave(&_thread_signal_lock);

if (tid->sig_pending & sig_mask(sig))

{

/* whether already emits this signal? */

struct rt_slist_node *node;

struct siginfo_node *entry;

si_node = (struct siginfo_node *)tid->si_list;

if (si_node)

{

node = (struct rt_slist_node *)&si_node->list;

}

else

{

node = RT_NULL;

}

/* update sig info */

for (; (node) != RT_NULL; node = node->next)

{

entry = rt_slist_entry(node, struct siginfo_node, list);

if (entry->si.si_signo == sig)

{

memcpy(&(entry->si), &si, sizeof(siginfo_t));

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

return 0;

}

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

si_node = (struct siginfo_node *)rt_mp_alloc(_siginfo_pool, 0);

if (si_node)

{

rt_slist_init(&(si_node->list));

memcpy(&(si_node->si), &si, sizeof(siginfo_t));

level = rt_spin_lock_irqsave(&_thread_signal_lock);

if (tid->si_list)

{

struct siginfo_node *si_list;

si_list = (struct siginfo_node *)tid->si_list;

rt_slist_append(&(si_list->list), &(si_node->list));

}

else

{

tid->si_list = si_node;

}

/* a new signal */

tid->sig_pending |= sig_mask(sig);

rt_spin_unlock_irqrestore(&_thread_signal_lock, level);

}

else

{

LOG_E("The allocation of signal info node failed.");

return -RT_EEMPTY;

}

/* deliver signal to this thread */

_signal_deliver(tid);

return RT_EOK;

}

int rt_system_signal_init(void)

{

_siginfo_pool = rt_mp_create("signal", RT_SIG_INFO_MAX, sizeof(struct siginfo_node));

if (_siginfo_pool == RT_NULL)

{

LOG_E("create memory pool for signal info failed.");

RT_ASSERT(0);

}

return 0;

}

#endif /* RT_USING_SIGNALS */

rt-thread/src/signal.c at master · RT-Thread/rt-thread · GitHub

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