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posix/pthreads: fix pthread_barrier_wait() behavior to match Posix

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Exactly one caller of pthread_barrier_wait() should receive a return
value of PTHREAD_BARRIER_SERIAL_WAIT; all others should receive zero
(or an error code). Added a test to match.

Fixes: #9953

Signed-off-by: Charles E. Youse <charles.youse@intel.com>
This commit is contained in:
Charles E. Youse 2019-03-01 15:22:22 -08:00 • committed by Anas Nashif
commit 3522e05f76
3 changed files with 20 additions and 7 deletions
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2
include/posix/pthread.h
View file

@ -334,6 +334,8 @@ static inline int pthread_mutexattr_destroy(pthread_mutexattr_t *m)
.max = count, \
}
#define PTHREAD_BARRIER_SERIAL_THREAD 1
/**
* @brief POSIX threading compatibility API
*

12
lib/posix/pthread_barrier.c
View file

@ -11,10 +11,8 @@
int pthread_barrier_wait(pthread_barrier_t *b)
{
/* FIXME: This function should return PTHREAD_BARRIER_SERIAL_THREAD
* for an arbitrary thread and 0 for the others.
*/
int key = irq_lock();
unsigned int key = irq_lock();
int ret = 0;
b->count++;
@ -25,8 +23,10 @@ int pthread_barrier_wait(pthread_barrier_t *b)
_ready_one_thread(&b->wait_q);
}
_reschedule_irqlock(key);
return 0;
ret = PTHREAD_BARRIER_SERIAL_THREAD;
} else {
return _pend_curr_irqlock(key, &b->wait_q, K_FOREVER);
(void) _pend_curr_irqlock(key, &b->wait_q, K_FOREVER);
}
return ret;
}

13
tests/posix/common/src/pthread.c
View file

@ -44,6 +44,7 @@ static int curr_bounce_thread;
static int barrier_failed;
static int barrier_done[N_THR_E];
static int barrier_return[N_THR_E];
/* First phase bounces execution between two threads using a condition
* variable, continuously testing that no other thread is mucking with
@ -138,7 +139,7 @@ void *thread_top_exec(void *p1)
sem_post(&main_sem);
}
}
pthread_barrier_wait(&barrier);
barrier_return[id] = pthread_barrier_wait(&barrier);
barrier_done[id] = 1;
sem_post(&main_sem);
pthread_exit(p1);
@ -231,6 +232,7 @@ void test_posix_pthread_execution(void)
int schedpolicy = SCHED_FIFO;
void *retval, *stackaddr;
size_t stacksize;
int serial_threads = 0;
sem_init(&main_sem, 0, 1);
schedparam.sched_priority = CONFIG_NUM_COOP_PRIORITIES - 1;
@ -346,6 +348,15 @@ void test_posix_pthread_execution(void)
pthread_join(newthread[i], &retval);
}
for (i = 0; i < N_THR_E; i++) {
if (barrier_return[i] == PTHREAD_BARRIER_SERIAL_THREAD) {
++serial_threads;
}
}
/* TESTPOINT: Check only one PTHREAD_BARRIER_SERIAL_THREAD returned. */
zassert_true(serial_threads == 1, "Bungled barrier return value(s)");
printk("Barrier test OK\n");
}