bool RWLockImplLxrt38::tryWriteLock()
{
#ifdef STRICT_LXRT_CHECKS
if (!icl_core::os::isThisLxrtTask())
{
PRINTF("RWLockImplLxrt38::tryWriteLock: Called from a Linux task!\n");
return false;
}
#endif
int ret = rt_rwl_wrlock_if(m_rwlock);
return ret == 0;
/*
// ATTENTION: Calling pthread_rwlock_trywrlock_rt() while another
// thread holds a read lock seems to be buggy in RTAI 3.3, so the
// following does NOT work:
// int ret = pthread_rwlock_trywrlock_rt(rwlock);
// return (ret == 0);
// Therefore we call WriteLock() with a very short timeout!
static icl_core::TimeSpan try_write_lock_timeout(0, 1);
return writeLock(try_write_lock_timeout);
*/
}
static void fun(long idx)
{
unsigned int loops = LOOPS;
while(loops--) {
rt_printk("TASK %d 1 COND/TIMED PREWLOCKED\n", idx);
if (idx%2) {
if (rt_rwl_wrlock_if(&rwl)) {
rt_printk("TASK %d 1 COND PREWLOCKED FAILED GO UNCOND\n", idx);
rt_rwl_wrlock(&rwl);
}
} else if (rt_rwl_wrlock_timed(&rwl, nano2count(20000)) >= SEM_TIMOUT) {
rt_printk("TASK %d 1 TIMED PREWLOCKED FAILED GO UNCOND\n", idx);
rt_rwl_wrlock(&rwl);
}
rt_printk("TASK %d 1 WLOCKED\n", idx);
rt_busy_sleep(100000);
rt_printk("TASK %d 2 COND PREWLOCK\n", idx);
if (rt_rwl_wrlock_if(&rwl)) {
rt_printk("TASK %d 2 COND PREWLOCK FAILED GO UNCOND\n", idx);
rt_rwl_wrlock(&rwl);
}
rt_printk("TASK %d 2 WLOCK\n", idx);
rt_busy_sleep(100000);
rt_printk("TASK %d 3 PREWLOCK\n", idx);
rt_rwl_wrlock(&rwl);
rt_printk("TASK %d 3 WLOCK\n", idx);
rt_busy_sleep(100000);
rt_printk("TASK %d 3 PREWUNLOCK\n", idx);
rt_rwl_unlock(&rwl);
rt_printk("TASK %d 3 WUNLOCK\n", idx);
rt_busy_sleep(100000);
rt_printk("TASK %d 2 PREWUNLOCK\n", idx);
rt_rwl_unlock(&rwl);
rt_printk("TASK %d 2 WUNLOCK\n", idx);
rt_busy_sleep(100000);
rt_printk("TASK %d 1 PREWUNLOCKED\n", idx);
rt_rwl_unlock(&rwl);
rt_printk("TASK %d 1 WUNLOCKED\n", idx);
rt_busy_sleep(100000);
rt_printk("TASK %d 1 COND/TIMED PRERDLOCKED\n", idx);
if (idx%2) {
if (rt_rwl_rdlock_if(&rwl)) {
rt_printk("TASK %d 1 COND PRERDLOCKED FAILED GO UNCOND\n", idx);
rt_rwl_rdlock(&rwl);
}
} else if (rt_rwl_rdlock_timed(&rwl, nano2count(20000)) >= SEM_TIMOUT) {
rt_printk("TASK %d 1 TIMED PRERDLOCKED FAILED GO UNCOND\n", idx);
rt_rwl_rdlock(&rwl);
}
rt_printk("TASK %d 1 RDLOCKED\n", idx);
rt_busy_sleep(100000);
rt_printk("TASK %d 2 COND PRERDLOCK\n", idx);
if (rt_rwl_rdlock_if(&rwl)) {
rt_printk("TASK %d 2 COND PRERDLOCK FAILED GO UNCOND\n", idx);
rt_rwl_rdlock(&rwl);
}
rt_printk("TASK %d 2 RDLOCK\n", idx);
rt_busy_sleep(100000);
rt_printk("TASK %d 3 PRERDLOCK\n", idx);
rt_rwl_rdlock(&rwl);
rt_printk("TASK %d 3 RDLOCK\n", idx);
rt_busy_sleep(100000);
rt_printk("TASK %d 3 PRERDUNLOCK\n", idx);
rt_rwl_unlock(&rwl);
rt_printk("TASK %d 3 RDUNLOCK\n", idx);
rt_busy_sleep(100000);
rt_printk("TASK %d 2 PRERDUNLOCK\n", idx);
rt_rwl_unlock(&rwl);
rt_printk("TASK %d 2 RDUNLOCK\n", idx);
rt_busy_sleep(100000);
rt_printk("TASK %d 1 PRERDUNLOCK\n", idx);
rt_rwl_unlock(&rwl);
rt_printk("TASK %d 1 RDUNLOCK\n", idx);
rt_busy_sleep(100000);
}
extcnt[idx - 1] = loops;
rt_sleep(nano2count(10000000));
rt_printk("TASK %d EXITED\n", idx);
}
