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feat: add ISR safe completion API 

Since the completion is used to sync with ISR mostly, we should set the
default semantic to ISR-safe. So most user will be happy and don't see
any weird behavior in their codes.

Changes:
- Added `rt_completion_wait_noisr` and
  `rt_completion_wait_flags_noisr` functions in `completion.h`,
  `completion_comm.c`, `completion_mp.c`, and `completion_up.c`.
- The new APIs allow waiting for completions in non-ISR contexts
  while ensuring thread context safety.
- Existing documentation and comments were updated to clarify
  usage contexts and emphasize restrictions on ISR usage.

Signed-off-by: Shell <smokewood@qq.com>
This commit is contained in:
Shell 2024-08-15 21:30:58 +08:00 committed by Rbb666
parent d87f30cf21
commit c451dce820
4 changed files with 81 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
components/drivers/include/ipc/completion.h
View File

@ -14,9 +14,9 @@
#include <rtconfig.h>
/**
* Completion - A tiny & rapid IPC primitive for resource-constrained scenarios
* RT-Completion - A Tiny(resource-constrained) & Rapid(lockless) IPC Primitive
*
* It's an IPC using one CPU word with the encoding:
* It's an IPC using one pointer word with the encoding:
*
* BIT | MAX-1 ----------------- 1 | 0 |
* CONTENT | suspended_thread & ~1 | completed flag |
@ -33,8 +33,12 @@ struct rt_completion
void rt_completion_init(struct rt_completion *completion);
rt_err_t rt_completion_wait(struct rt_completion *completion,
rt_int32_t timeout);
rt_err_t rt_completion_wait_noisr(struct rt_completion *completion,
rt_int32_t timeout);
rt_err_t rt_completion_wait_flags(struct rt_completion *completion,
rt_int32_t timeout, int suspend_flag);
rt_err_t rt_completion_wait_flags_noisr(struct rt_completion *completion,
rt_int32_t timeout, int suspend_flag);
void rt_completion_done(struct rt_completion *completion);
rt_err_t rt_completion_wakeup(struct rt_completion *completion);
rt_err_t rt_completion_wakeup_by_errno(struct rt_completion *completion, rt_err_t error);

22
components/drivers/ipc/completion_comm.c
View File

@ -35,6 +35,28 @@ rt_err_t rt_completion_wakeup(struct rt_completion *completion)
return rt_completion_wakeup_by_errno(completion, -1);
}
/**
* @brief This is same as rt_completion_wait(), except that this API is NOT
* ISR-safe (you can NOT call completion_done() on isr routine).
*
* @param completion is a pointer to a completion object.
*
* @param timeout is a timeout period (unit: OS ticks). If the completion is unavailable, the thread will wait for
* the completion done up to the amount of time specified by the argument.
* NOTE: Generally, we use the macro RT_WAITING_FOREVER to set this parameter, which means that when the
* completion is unavailable, the thread will be waitting forever.
*
* @return Return the operation status. ONLY when the return value is RT_EOK, the operation is successful.
* If the return value is any other values, it means that the completion wait failed.
*
* @warning This function can ONLY be called in the thread context. It MUST NOT be called in interrupt context.
*/
rt_err_t rt_completion_wait_noisr(struct rt_completion *completion,
rt_int32_t timeout)
{
return rt_completion_wait_flags_noisr(completion, timeout, RT_UNINTERRUPTIBLE);
}
/**
* @brief This function will wait for a completion, if the completion is unavailable, the thread shall wait for
* the completion up to a specified time.

34
components/drivers/ipc/completion_mp.c
View File

@ -65,11 +65,10 @@ void rt_completion_init(struct rt_completion *completion)
RTM_EXPORT(rt_completion_init);
/**
* @brief This function will wait for a completion, if the completion is unavailable, the thread shall wait for
* the completion up to a specified time.
* @brief This is same as rt_completion_wait_flags(), except that this API is NOT
* ISR-safe (you can NOT call completion_done() on isr routine).
*
* @param completion is a pointer to a completion object.
*
* @param timeout is a timeout period (unit: OS ticks). If the completion is unavailable, the thread will wait for
* the completion done up to the amount of time specified by the argument.
* NOTE: Generally, we use the macro RT_WAITING_FOREVER to set this parameter, which means that when the
@ -81,7 +80,7 @@ RTM_EXPORT(rt_completion_init);
*
* @warning This function can ONLY be called in the thread context. It MUST NOT be called in interrupt context.
*/
rt_err_t rt_completion_wait_flags(struct rt_completion *completion,
rt_err_t rt_completion_wait_flags_noisr(struct rt_completion *completion,
rt_int32_t timeout, int suspend_flag)
{
rt_err_t result = -RT_ERROR;
@ -159,6 +158,33 @@ rt_err_t rt_completion_wait_flags(struct rt_completion *completion,
return result;
}
/**
* @brief This function will wait for a completion, if the completion is unavailable, the thread shall wait for
* the completion up to a specified time.
*
* @param completion is a pointer to a completion object.
* @param timeout is a timeout period (unit: OS ticks). If the completion is unavailable, the thread will wait for
* the completion done up to the amount of time specified by the argument.
* NOTE: Generally, we use the macro RT_WAITING_FOREVER to set this parameter, which means that when the
* completion is unavailable, the thread will be waitting forever.
* @param suspend_flag suspend flags. See rt_thread_suspend_with_flag()
*
* @return Return the operation status. ONLY when the return value is RT_EOK, the operation is successful.
* If the return value is any other values, it means that the completion wait failed.
*
* @warning This function can ONLY be called in the thread context. It MUST NOT be called in interrupt context.
*/
rt_err_t rt_completion_wait_flags(struct rt_completion *completion,
rt_int32_t timeout, int suspend_flag)
{
rt_err_t error;
rt_ubase_t level;
level = rt_hw_local_irq_disable();
error = rt_completion_wait_flags_noisr(completion, timeout, suspend_flag);
rt_hw_local_irq_enable(level);
return error;
}
static rt_base_t _wait_until_update(struct rt_completion *completion, rt_base_t expected)
{
rt_base_t current_value;

22
components/drivers/ipc/completion_up.c
View File

@ -148,6 +148,28 @@ __exit:
return result;
}
/**
* @brief This is same as rt_completion_wait_flags(), except that this API is NOT
* ISR-safe (you can NOT call completion_done() on isr routine).
*
* @param completion is a pointer to a completion object.
* @param timeout is a timeout period (unit: OS ticks). If the completion is unavailable, the thread will wait for
* the completion done up to the amount of time specified by the argument.
* NOTE: Generally, we use the macro RT_WAITING_FOREVER to set this parameter, which means that when the
* completion is unavailable, the thread will be waitting forever.
* @param suspend_flag suspend flags. See rt_thread_suspend_with_flag()
*
* @return Return the operation status. ONLY when the return value is RT_EOK, the operation is successful.
* If the return value is any other values, it means that the completion wait failed.
*
* @warning This function can ONLY be called in the thread context. It MUST NOT be called in interrupt context.
*/
rt_err_t rt_completion_wait_flags_noisr(struct rt_completion *completion,
rt_int32_t timeout, int suspend_flag)
{
return rt_completion_wait_flags(completion, timeout, suspend_flag);
}
/**
* @brief This function indicates a completion has done and wakeup the thread
* and update its errno. No update is applied if it's a negative value.