diff options
Diffstat (limited to 'nuttx/sched/sem_trywait.c')
| -rw-r--r-- | nuttx/sched/sem_trywait.c | 30 |
1 files changed, 14 insertions, 16 deletions
diff --git a/nuttx/sched/sem_trywait.c b/nuttx/sched/sem_trywait.c index d50dc106d..cbd8dae69 100644 --- a/nuttx/sched/sem_trywait.c +++ b/nuttx/sched/sem_trywait.c @@ -2,7 +2,7 @@ * sched/sem_trywait.c * * Copyright (C) 2007-2009 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * Author: Gregory Nutt <gnutt@nuttx.org> * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -73,23 +73,22 @@ ****************************************************************************/ /**************************************************************************** - * Function: sem_trywait + * Name: sem_trywait * * Description: - * This function locks the specified semaphore only if the - * semaphore is currently not locked. Otherwise, it locks - * the semaphore. In either case, the call returns without - * blocking. + * This function locks the specified semaphore only if the semaphore is + * currently not locked. Otherwise, it locks the semaphore. In either + * case, the call returns without blocking. * * Parameters: * sem - the semaphore descriptor * * Return Value: - * 0 (OK) or -1 (ERROR) if unsuccessful - * If this function returns -1 (ERROR), then the cause - * of the failure will be reported in "errno" as: - * - EINVAL: Invalid attempt to get the semaphore - * - EAGAIN: The semaphore is not available. + * 0 (OK) or -1 (ERROR) if unsuccessful. If this function returns -1 + * (ERROR),then the cause of the failure will be reported in "errno" as: + * + * EINVAL: Invalid attempt to get the semaphore + * EAGAIN: The semaphore is not available. * * Assumptions: * @@ -107,13 +106,12 @@ int sem_trywait(FAR sem_t *sem) /* Assume any errors reported are due to invalid arguments. */ - *get_errno_ptr() = EINVAL; + set_errno(EINVAL); if (sem) { - /* The following operations must be performed with interrupts - * disabled because sem_post() may be called from an interrupt - * handler. + /* The following operations must be performed with interrupts disabled + * because sem_post() may be called from an interrupt handler. */ saved_state = irqsave(); @@ -122,7 +120,7 @@ int sem_trywait(FAR sem_t *sem) * is not available. */ - *get_errno_ptr() = EAGAIN; + set_errno(EAGAIN); /* If the semaphore is available, give it to the requesting task */ |