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sched: semaphore: Remove a redundant critical section in nxsem_clockwait()

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Summary:
- This commit removes a redundant critical section in nxsem_clockwait()

Impact:
- None

Testing:
- Tested with ostest with the following configurations
- maix-bit:smp (QEMU), sim:smp, esp32-devkitc:smp (QEMU)
- sabre-6quad:smp (QEMU), spresense:smp
- maix-bit:nsh (QEMU), sim:ostest, esp32-devkitc:ostest (QEMU)
- sabre-6quad:nsh (QEMU), spresense:wifi

Signed-off-by: Masayuki Ishikawa <Masayuki.Ishikawa@jp.sony.com>
This commit is contained in:
Masayuki Ishikawa 2021-03-16 08:06:16 +09:00 committed by Xiang Xiao
parent a93d538f3b
commit 65dec5d10a
1 changed files with 8 additions and 18 deletions
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26
sched/semaphore/sem_clockwait.c
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@ -91,7 +91,6 @@ int nxsem_clockwait(FAR sem_t *sem, clockid_t clockid,
FAR const struct timespec *abstime)
{
FAR struct tcb_s *rtcb = this_task();
irqstate_t flags;
sclock_t ticks;
int status;
int ret = ERROR;
@ -109,16 +108,11 @@ int nxsem_clockwait(FAR sem_t *sem, clockid_t clockid,
}
#endif
/* We will disable interrupts until we have completed the semaphore
* wait. We need to do this (as opposed to just disabling pre-emption)
* because there could be interrupt handlers that are asynchronously
* posting semaphores and to prevent race conditions with watchdog
* timeout. This is not too bad because interrupts will be re-
* enabled while we are blocked waiting for the semaphore.
/* NOTE: We do not need a critical section here, because
* nxsem_wait() and nxsem_timeout() use a critical section
* in the functions.
*/
flags = enter_critical_section();
/* Try to take the semaphore without waiting. */
ret = nxsem_trywait(sem);
@ -126,7 +120,7 @@ int nxsem_clockwait(FAR sem_t *sem, clockid_t clockid,
{
/* We got it! */
goto success_with_irqdisabled;
goto out;
}
/* We will have to wait for the semaphore. Make sure that we were provided
@ -136,7 +130,7 @@ int nxsem_clockwait(FAR sem_t *sem, clockid_t clockid,
if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
{
ret = -EINVAL;
goto errout_with_irqdisabled;
goto out;
}
/* Convert the timespec to clock ticks. We must have interrupts
@ -153,7 +147,7 @@ int nxsem_clockwait(FAR sem_t *sem, clockid_t clockid,
if (status == OK && ticks <= 0)
{
ret = -ETIMEDOUT;
goto errout_with_irqdisabled;
goto out;
}
/* Handle any time-related errors */
@ -161,7 +155,7 @@ int nxsem_clockwait(FAR sem_t *sem, clockid_t clockid,
if (status != OK)
{
ret = -status;
goto errout_with_irqdisabled;
goto out;
}
/* Start the watchdog */
@ -178,11 +172,7 @@ int nxsem_clockwait(FAR sem_t *sem, clockid_t clockid,
wd_cancel(&rtcb->waitdog);
/* We can now restore interrupts and delete the watchdog */
success_with_irqdisabled:
errout_with_irqdisabled:
leave_critical_section(flags);
out:
return ret;
}