source:
rtems/cpukit/rtems/src/regionreturnsegment.c
@
e980b219
Last change on this file since e980b219 was e980b219, checked in by Joel Sherrill <joel.sherrill@…>, on 05/06/04 at 19:21:40 | |
---|---|
|
|
File size: 3.0 KB |
Rev | Line | |
---|---|---|
[5aa64518] | 1 | /* |
2 | * Region Manager | |
3 | * | |
4 | * | |
[08311cc3] | 5 | * COPYRIGHT (c) 1989-1999. |
[5aa64518] | 6 | * On-Line Applications Research Corporation (OAR). |
7 | * | |
8 | * The license and distribution terms for this file may be | |
9 | * found in the file LICENSE in this distribution or at | |
[277cc95] | 10 | * http://www.rtems.com/license/LICENSE. |
[5aa64518] | 11 | * |
12 | * $Id$ | |
13 | */ | |
14 | ||
[82d11f87] | 15 | #ifdef RTEMS_REGION_SHRED_ON_FREE |
[5aa64518] | 16 | #include <string.h> |
[82d11f87] | 17 | |
18 | #ifndef RTEMS_REGION_FREE_SHRED_PATTERN | |
19 | #define RTEMS_REGION_FREE_SHRED_PATTERN 0x00 | |
20 | #endif | |
[5aa64518] | 21 | #endif |
22 | ||
23 | #include <rtems/system.h> | |
24 | #include <rtems/rtems/status.h> | |
25 | #include <rtems/rtems/support.h> | |
26 | #include <rtems/score/object.h> | |
27 | #include <rtems/rtems/options.h> | |
28 | #include <rtems/rtems/region.h> | |
29 | #include <rtems/score/states.h> | |
30 | #include <rtems/score/thread.h> | |
[90015e7f] | 31 | #include <rtems/score/apimutex.h> |
[5aa64518] | 32 | |
33 | /*PAGE | |
34 | * | |
35 | * rtems_region_return_segment | |
36 | * | |
37 | * This directive will return a segment to its region. | |
38 | * | |
39 | * Input parameters: | |
40 | * id - region id | |
41 | * segment - pointer to segment address | |
42 | * | |
43 | * Output parameters: | |
44 | * RTEMS_SUCCESSFUL - if successful | |
[e980b219] | 45 | * error code - if unsuccessful |
[5aa64518] | 46 | */ |
47 | ||
48 | rtems_status_code rtems_region_return_segment( | |
49 | Objects_Id id, | |
50 | void *segment | |
51 | ) | |
52 | { | |
53 | register Region_Control *the_region; | |
54 | Thread_Control *the_thread; | |
55 | Objects_Locations location; | |
56 | void **the_segment; | |
57 | #ifdef RTEMS_REGION_FREE_SHRED_PATTERN | |
[1d496f6] | 58 | uint32_t size; |
[5aa64518] | 59 | #endif |
60 | int status; | |
61 | ||
[90015e7f] | 62 | _RTEMS_Lock_allocator(); |
[5aa64518] | 63 | the_region = _Region_Get( id, &location ); |
64 | switch ( location ) { | |
65 | ||
66 | case OBJECTS_REMOTE: /* this error cannot be returned */ | |
[90015e7f] | 67 | _RTEMS_Unlock_allocator(); |
[5aa64518] | 68 | return RTEMS_INTERNAL_ERROR; |
69 | ||
70 | case OBJECTS_ERROR: | |
[90015e7f] | 71 | _RTEMS_Unlock_allocator(); |
[5aa64518] | 72 | return RTEMS_INVALID_ID; |
73 | ||
74 | case OBJECTS_LOCAL: | |
75 | ||
76 | _Region_Debug_Walk( the_region, 3 ); | |
77 | ||
78 | #ifdef RTEMS_REGION_FREE_SHRED_PATTERN | |
[b10520f] | 79 | if ( _Heap_Size_of_user_area( &the_region->Memory, segment, &size ) ) { |
[82d11f87] | 80 | memset(segment, (RTEMS_REGION_FREE_SHRED_PATTERN & 0xFF), size); |
[5aa64518] | 81 | } else { |
[90015e7f] | 82 | _RTEMS_Unlock_allocator(); |
[5aa64518] | 83 | return RTEMS_INVALID_ADDRESS; |
84 | } | |
85 | #endif | |
86 | ||
87 | status = _Region_Free_segment( the_region, segment ); | |
88 | ||
89 | _Region_Debug_Walk( the_region, 4 ); | |
90 | ||
91 | if ( !status ) { | |
[90015e7f] | 92 | _RTEMS_Unlock_allocator(); |
[5aa64518] | 93 | return RTEMS_INVALID_ADDRESS; |
94 | } | |
95 | ||
96 | the_region->number_of_used_blocks -= 1; | |
97 | for ( ; ; ) { | |
98 | the_thread = _Thread_queue_First( &the_region->Wait_queue ); | |
99 | ||
100 | if ( the_thread == NULL ) | |
101 | break; | |
102 | ||
103 | the_segment = (void **) _Region_Allocate_segment( | |
[50f32b11] | 104 | the_region, |
[5aa64518] | 105 | the_thread->Wait.count |
106 | ); | |
107 | ||
108 | if ( the_segment == NULL ) | |
109 | break; | |
110 | ||
111 | *(void **)the_thread->Wait.return_argument = the_segment; | |
112 | the_region->number_of_used_blocks += 1; | |
113 | _Thread_queue_Extract( &the_region->Wait_queue, the_thread ); | |
114 | the_thread->Wait.return_code = RTEMS_SUCCESSFUL; | |
115 | } | |
116 | ||
[90015e7f] | 117 | _RTEMS_Unlock_allocator(); |
[5aa64518] | 118 | return RTEMS_SUCCESSFUL; |
119 | } | |
120 | ||
121 | return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */ | |
122 | } |
Note: See TracBrowser
for help on using the repository browser.