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sched/signal: Optimize code logic

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Adjust the up_schedule_sigaction function to facilitate subsequent spinlock optimization work.

Signed-off-by: wangzhi16 <wangzhi16@xiaomi.com>
This commit is contained in:
wangzhi16
2025-03-17 17:49:43 +08:00
committed by Xiang Xiao
parent 5775037da6
commit 364a633ec3
31 changed files with 436 additions and 1120 deletions
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arch/tricore/src/common/tricore_schedulesigaction.c
+10 -72
View File
@@ -80,81 +80,19 @@
void up_schedule_sigaction(struct tcb_s *tcb)
{
/* First, handle some special cases when the signal is
* being delivered to the currently executing task.
/* Save the context registers. These will be
* restored by the signal trampoline after the signals have
* been delivered.
*/
if (tcb == this_task())
{
/* CASE 1: We are not in an interrupt handler and
* a task is signalling itself for some reason.
*/
tcb->xcp.saved_regs = tcb->xcp.regs;
if (!up_interrupt_context())
{
/* In this case just deliver the signal now. */
(tcb->sigdeliver)(tcb);
tcb->sigdeliver = NULL;
}
/* CASE 2: We are in an interrupt handler AND the
* interrupted task is the same as the one that
* must receive the signal, then we will have to modify
* the return state as well as the state in the TCB.
*
* Hmmm... there looks like a latent bug here: The following
* logic would fail in the strange case where we are in an
* interrupt handler, the thread is signalling itself, but
* a context switch to another task has occurred so that
* g_current_regs does not refer to the thread of this_task()!
*/
else
{
/* Save the context registers. These will be
* restored by the signal trampoline after the signals have
* been delivered.
*/
tcb->xcp.saved_regs = tcb->xcp.regs;
/* Create a new CSA for signal delivery. The new context
* will borrow the process stack of the current tcb.
*/
tcb->xcp.regs =
tricore_alloc_csa((uintptr_t)tricore_sigdeliver,
STACKFRAME_ALIGN_DOWN
(up_getusrsp(tcb->xcp.regs)),
PSW_IO_SUPERVISOR | PSW_CDE, true);
}
}
/* Otherwise, we are (1) signaling a task is not running
* from an interrupt handler or (2) we are not in an
* interrupt handler and the running task is signalling
* some non-running task.
/* Create a new CSA for signal delivery. The new context
* will borrow the process stack of the current tcb.
*/
else
{
/* Save the return EPC and STATUS registers. These will be
* restored by the signal trampoline after the signals have
* been delivered.
*/
/* Save the current register context location */
tcb->xcp.saved_regs = tcb->xcp.regs;
/* Create a new CSA for signal delivery. The new context
* will borrow the process stack of the current tcb.
*/
tcb->xcp.regs =
tricore_alloc_csa((uintptr_t)tricore_sigdeliver,
STACKFRAME_ALIGN_DOWN(up_getusrsp(tcb->xcp.regs)),
PSW_IO_SUPERVISOR | PSW_CDE, true);
}
tcb->xcp.regs = tricore_alloc_csa((uintptr_t)tricore_sigdeliver,
STACKFRAME_ALIGN_DOWN
(up_getusrsp(tcb->xcp.regs)),
PSW_IO_SUPERVISOR | PSW_CDE, true);
}