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gh-74953: Reformat PyThread_acquire_lock_timed() by vstinner · Pull Request #93947 · python/cpython · GitHub

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gh-74953: Reformat PyThread_acquire_lock_timed() #93947

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vstinner merged 1 commit into from
Jun 19, 2022
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gh-74953: Reformat PyThread_acquire_lock_timed() #93947

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108 changes: 62 additions & 46 deletions Python/thread_pthread.h
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Original file line number Diff line number Diff line change
Expand Up @@ -619,63 +619,79 @@ PyThread_acquire_lock_timed(PyThread_type_lock lock, PY_TIMEOUT_T microseconds,

if (microseconds == 0) {
status = pthread_mutex_trylock( &thelock->mut );
if (status != EBUSY)
if (status != EBUSY) {
CHECK_STATUS_PTHREAD("pthread_mutex_trylock[1]");
}
}
else {
status = pthread_mutex_lock( &thelock->mut );
CHECK_STATUS_PTHREAD("pthread_mutex_lock[1]");
}
if (status == 0) {
if (thelock->locked == 0) {
success = PY_LOCK_ACQUIRED;
}
else if (microseconds != 0) {
struct timespec abs;
if (microseconds > 0) {
_PyThread_cond_after(microseconds, &abs);
if (status != 0) {
goto done;
}

if (thelock->locked == 0) {
success = PY_LOCK_ACQUIRED;
goto unlock;
}
if (microseconds == 0) {
goto unlock;
}

struct timespec abs;
if (microseconds > 0) {
_PyThread_cond_after(microseconds, &abs);
}
// Continue trying until we get the lock

// mut must be locked by me -- part of the condition protocol
while (1) {
if (microseconds > 0) {
status = pthread_cond_timedwait(&thelock->lock_released,
&thelock->mut, &abs);
if (status == 1) {
break;
}
/* continue trying until we get the lock */

/* mut must be locked by me -- part of the condition
* protocol */
while (success == PY_LOCK_FAILURE) {
if (microseconds > 0) {
status = pthread_cond_timedwait(
&thelock->lock_released,
&thelock->mut, &abs);
if (status == 1) {
break;
}
if (status == ETIMEDOUT)
break;
CHECK_STATUS_PTHREAD("pthread_cond_timedwait");
}
else {
status = pthread_cond_wait(
&thelock->lock_released,
&thelock->mut);
CHECK_STATUS_PTHREAD("pthread_cond_wait");
}

if (intr_flag && status == 0 && thelock->locked) {
/* We were woken up, but didn't get the lock. We probably received
* a signal. Return PY_LOCK_INTR to allow the caller to handle
* it and retry. */
success = PY_LOCK_INTR;
break;
}
else if (status == 0 && !thelock->locked) {
success = PY_LOCK_ACQUIRED;
}
if (status == ETIMEDOUT) {
break;
}
CHECK_STATUS_PTHREAD("pthread_cond_timedwait");
}
else {
status = pthread_cond_wait(
&thelock->lock_released,
&thelock->mut);
CHECK_STATUS_PTHREAD("pthread_cond_wait");
}

if (intr_flag && status == 0 && thelock->locked) {
// We were woken up, but didn't get the lock. We probably received
// a signal. Return PY_LOCK_INTR to allow the caller to handle
// it and retry.
success = PY_LOCK_INTR;
break;
}

if (status == 0 && !thelock->locked) {
success = PY_LOCK_ACQUIRED;
break;
}
if (success == PY_LOCK_ACQUIRED) thelock->locked = 1;
status = pthread_mutex_unlock( &thelock->mut );
CHECK_STATUS_PTHREAD("pthread_mutex_unlock[1]");

// Wait got interrupted by a signal: retry
}

unlock:
if (success == PY_LOCK_ACQUIRED) {
thelock->locked = 1;
}
status = pthread_mutex_unlock( &thelock->mut );
CHECK_STATUS_PTHREAD("pthread_mutex_unlock[1]");

if (error) success = PY_LOCK_FAILURE;
done:
if (error) {
success = PY_LOCK_FAILURE;
}
return success;
}

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