5
Last change
on this file since 2dd5e6fb was
2dd5e6fb,
checked in by Sebastian Huber <sebastian.huber@…>, on 04/20/16 at 04:43:11
|
posix: Use _Objects_Get_local() for semaphores
This simplifies the code since the object location is no longer used.
Remove superfluous header includes.
|
-
Property mode set to
100644
|
File size:
1011 bytes
|
Line | |
---|
1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @brief Get the Value of a Semaphore |
---|
5 | * @ingroup POSIX_SEMAPHORE |
---|
6 | */ |
---|
7 | |
---|
8 | /* |
---|
9 | * COPYRIGHT (c) 1989-2014. |
---|
10 | * On-Line Applications Research Corporation (OAR). |
---|
11 | * |
---|
12 | * The license and distribution terms for this file may be |
---|
13 | * found in the file LICENSE in this distribution or at |
---|
14 | * http://www.rtems.org/license/LICENSE. |
---|
15 | */ |
---|
16 | |
---|
17 | #if HAVE_CONFIG_H |
---|
18 | #include "config.h" |
---|
19 | #endif |
---|
20 | |
---|
21 | #include <semaphore.h> |
---|
22 | |
---|
23 | #include <rtems/posix/semaphoreimpl.h> |
---|
24 | |
---|
25 | int sem_getvalue( |
---|
26 | sem_t *__restrict sem, |
---|
27 | int *__restrict sval |
---|
28 | ) |
---|
29 | { |
---|
30 | POSIX_Semaphore_Control *the_semaphore; |
---|
31 | ISR_lock_Context lock_context; |
---|
32 | |
---|
33 | the_semaphore = _POSIX_Semaphore_Get( sem, &lock_context ); |
---|
34 | |
---|
35 | if ( the_semaphore == NULL ) { |
---|
36 | rtems_set_errno_and_return_minus_one( EINVAL ); |
---|
37 | } |
---|
38 | |
---|
39 | /* |
---|
40 | * Assume a relaxed atomic load of the value on SMP configurations. |
---|
41 | * Thus, there is no need to acquire a lock. |
---|
42 | */ |
---|
43 | *sval = _CORE_semaphore_Get_count( &the_semaphore->Semaphore ); |
---|
44 | |
---|
45 | _ISR_lock_ISR_enable( &lock_context ); |
---|
46 | return 0; |
---|
47 | } |
---|
Note: See
TracBrowser
for help on using the repository browser.