blob: 96e8dbfebae924da84e28ffb61770db9b7b4e203 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
|
/**
* @file
*
* @brief Changes the Priority Ceiling of a Mutex and Releases it
* @ingroup POSIXAPI
*/
/*
* COPYRIGHT (c) 1989-2009.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/posix/muteximpl.h>
#include <rtems/posix/priorityimpl.h>
/*
* 13.6.2 Change the Priority Ceiling of a Mutex, P1003.1c/Draft 10, p. 131
*/
int pthread_mutex_setprioceiling(
pthread_mutex_t *mutex,
int prioceiling,
int *old_ceiling
)
{
register POSIX_Mutex_Control *the_mutex;
Priority_Control the_priority;
int error;
if ( !old_ceiling )
return EINVAL;
if ( !_POSIX_Priority_Is_valid( prioceiling ) )
return EINVAL;
the_priority = _POSIX_Priority_To_core( prioceiling );
/*
* Must acquire the mutex before we can change it's ceiling.
* POSIX says block until we acquire it.
*/
error = pthread_mutex_lock( mutex );
if ( error != 0 ) {
_Assert( error == EINVAL );
return EINVAL;
}
the_mutex = _POSIX_Mutex_Get_no_protection( mutex );
_Assert( the_mutex != NULL );
*old_ceiling = _POSIX_Priority_From_core(
the_mutex->Mutex.priority_ceiling
);
the_mutex->Mutex.priority_ceiling = the_priority;
error = pthread_mutex_unlock( mutex );
_Assert( error == 0 );
(void) error;
return 0;
}
|
