1 | /* |
---|
2 | * Mutex Handler |
---|
3 | * |
---|
4 | * DESCRIPTION: |
---|
5 | * |
---|
6 | * This package is the implementation of the Mutex Handler. |
---|
7 | * This handler provides synchronization and mutual exclusion capabilities. |
---|
8 | * |
---|
9 | * COPYRIGHT (c) 1989-1998. |
---|
10 | * On-Line Applications Research Corporation (OAR). |
---|
11 | * Copyright assigned to U.S. Government, 1994. |
---|
12 | * |
---|
13 | * The license and distribution terms for this file may be |
---|
14 | * found in the file LICENSE in this distribution or at |
---|
15 | * http://www.OARcorp.com/rtems/license.html. |
---|
16 | * |
---|
17 | * $Id$ |
---|
18 | */ |
---|
19 | |
---|
20 | #include <rtems/system.h> |
---|
21 | #include <rtems/score/isr.h> |
---|
22 | #include <rtems/score/coremutex.h> |
---|
23 | #include <rtems/score/states.h> |
---|
24 | #include <rtems/score/thread.h> |
---|
25 | #include <rtems/score/threadq.h> |
---|
26 | |
---|
27 | /*PAGE |
---|
28 | * |
---|
29 | * _CORE_mutex_Initialize |
---|
30 | * |
---|
31 | * This routine initializes a mutex at create time and set the control |
---|
32 | * structure according to the values passed. |
---|
33 | * |
---|
34 | * Input parameters: |
---|
35 | * the_mutex - the mutex control block to initialize |
---|
36 | * the_class - the API class of the object |
---|
37 | * the_mutex_attributes - the mutex attributes specified at create time |
---|
38 | * initial_lock - mutex initial lock or unlocked status |
---|
39 | * proxy_extract_callout - MP specific extract callout |
---|
40 | * |
---|
41 | * Output parameters: NONE |
---|
42 | */ |
---|
43 | |
---|
44 | void _CORE_mutex_Initialize( |
---|
45 | CORE_mutex_Control *the_mutex, |
---|
46 | Objects_Classes the_class, |
---|
47 | CORE_mutex_Attributes *the_mutex_attributes, |
---|
48 | unsigned32 initial_lock, |
---|
49 | Thread_queue_Extract_callout proxy_extract_callout |
---|
50 | ) |
---|
51 | { |
---|
52 | |
---|
53 | /* Add this to the RTEMS environment later ????????? |
---|
54 | rtems_assert( initial_lock == CORE_MUTEX_LOCKED || |
---|
55 | initial_lock == CORE_MUTEX_UNLOCKED ); |
---|
56 | */ |
---|
57 | |
---|
58 | the_mutex->Attributes = *the_mutex_attributes; |
---|
59 | the_mutex->lock = initial_lock; |
---|
60 | |
---|
61 | if ( initial_lock == CORE_MUTEX_LOCKED ) { |
---|
62 | the_mutex->nest_count = 1; |
---|
63 | the_mutex->holder = _Thread_Executing; |
---|
64 | the_mutex->holder_id = _Thread_Executing->Object.id; |
---|
65 | _Thread_Executing->resource_count++; |
---|
66 | } else { |
---|
67 | the_mutex->nest_count = 0; |
---|
68 | the_mutex->holder = NULL; |
---|
69 | the_mutex->holder_id = 0; |
---|
70 | } |
---|
71 | |
---|
72 | _Thread_queue_Initialize( |
---|
73 | &the_mutex->Wait_queue, |
---|
74 | the_class, |
---|
75 | _CORE_mutex_Is_fifo( the_mutex_attributes ) ? |
---|
76 | THREAD_QUEUE_DISCIPLINE_FIFO : THREAD_QUEUE_DISCIPLINE_PRIORITY, |
---|
77 | STATES_WAITING_FOR_MUTEX, |
---|
78 | proxy_extract_callout, |
---|
79 | CORE_MUTEX_TIMEOUT |
---|
80 | ); |
---|
81 | } |
---|
82 | |
---|