📄 os_mutex.lst
字号:
##############################################################################
# #
# IAR ARM ANSI C/C++ Compiler V4.42A/W32 EVALUATION 12/Dec/2008 17:14:25 #
# Copyright 1999-2005 IAR Systems. All rights reserved. #
# #
# Cpu mode = arm #
# Endian = little #
# Stack alignment = 4 #
# Source file = E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\UCOS-II\uCOS-II #
# \Source\os_mutex.c #
# Command line = E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\UCOS-II\uCOS-II #
# \Source\os_mutex.c -lCN E:\IAR_2478\IAR_2478\26uCOS\ #
# Src\uCOS\RAM_Debug\List\ -o #
# E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\RAM_Debug\Obj\ #
# -z2 --no_cse --no_unroll --no_inline #
# --no_code_motion --no_tbaa --no_clustering #
# --no_scheduling --debug --cpu_mode arm --endian #
# little --cpu ARM7TDMI-S --stack_align 4 -e --fpu #
# None --dlib_config "C:\Program Files\IAR #
# Systems\Embedded Workbench 4.0 #
# Evaluation\arm\LIB\dl4tpannl8n.h" -I #
# E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\include\ -I #
# E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\ucos-ii\include #
# \ -I "C:\Program Files\IAR Systems\Embedded #
# Workbench 4.0 Evaluation\arm\INC\" #
# List file = E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\RAM_Debug\List\ #
# os_mutex.lst #
# Object file = E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\RAM_Debug\Obj\o #
# s_mutex.r79 #
# #
# #
##############################################################################
E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\UCOS-II\uCOS-II\Source\os_mutex.c
1 /*
2 *********************************************************************************************************
3 * uC/OS-II
4 * The Real-Time Kernel
5 * MUTUAL EXCLUSION SEMAPHORE MANAGEMENT
6 *
7 * (c) Copyright 1992-2007, Jean J. Labrosse, Weston, FL
8 * All Rights Reserved
9 *
10 * File : OS_MUTEX.C
11 * By : Jean J. Labrosse
12 * Version : V2.84
13 *
14 * LICENSING TERMS:
15 * ---------------
16 * uC/OS-II is provided in source form for FREE evaluation, for educational use or for peaceful research.
17 * If you plan on using uC/OS-II in a commercial product you need to contact Micri祄 to properly license
18 * its use in your product. We provide ALL the source code for your convenience and to help you experience
19 * uC/OS-II. The fact that the source is provided does NOT mean that you can use it without paying a
20 * licensing fee.
21 *********************************************************************************************************
22 */
23
24 #ifndef OS_MASTER_FILE
25 #include <ucos_ii.h>
26 #endif
27
28
29 #if OS_MUTEX_EN > 0
30 /*
31 *********************************************************************************************************
32 * LOCAL CONSTANTS
33 *********************************************************************************************************
34 */
35
36 #define OS_MUTEX_KEEP_LOWER_8 0x00FFu
37 #define OS_MUTEX_KEEP_UPPER_8 0xFF00u
38
39 #define OS_MUTEX_AVAILABLE 0x00FFu
40
41 /*
42 *********************************************************************************************************
43 * LOCAL CONSTANTS
44 *********************************************************************************************************
45 */
46
47 static void OSMutex_RdyAtPrio(OS_TCB *ptcb, INT8U prio);
48
49 /*$PAGE*/
50 /*
51 *********************************************************************************************************
52 * ACCEPT MUTUAL EXCLUSION SEMAPHORE
53 *
54 * Description: This function checks the mutual exclusion semaphore to see if a resource is available.
55 * Unlike OSMutexPend(), OSMutexAccept() does not suspend the calling task if the resource is
56 * not available or the event did not occur.
57 *
58 * Arguments : pevent is a pointer to the event control block
59 *
60 * err is a pointer to an error code which will be returned to your application:
61 * OS_ERR_NONE if the call was successful.
62 * OS_ERR_EVENT_TYPE if 'pevent' is not a pointer to a mutex
63 * OS_ERR_PEVENT_NULL 'pevent' is a NULL pointer
64 * OS_ERR_PEND_ISR if you called this function from an ISR
65 * OS_ERR_PIP_LOWER If the priority of the task that owns the Mutex is
66 * HIGHER (i.e. a lower number) than the PIP. This error
67 * indicates that you did not set the PIP higher (lower
68 * number) than ALL the tasks that compete for the Mutex.
69 * Unfortunately, this is something that could not be
70 * detected when the Mutex is created because we don't know
71 * what tasks will be using the Mutex.
72 *
73 * Returns : == 1 if the resource is available, the mutual exclusion semaphore is acquired
74 * == 0 a) if the resource is not available
75 * b) you didn't pass a pointer to a mutual exclusion semaphore
76 * c) you called this function from an ISR
77 *
78 * Warning(s) : This function CANNOT be called from an ISR because mutual exclusion semaphores are
79 * intended to be used by tasks only.
80 *********************************************************************************************************
81 */
82
83 #if OS_MUTEX_ACCEPT_EN > 0
\ In segment CODE, align 4, keep-with-next
84 INT8U OSMutexAccept (OS_EVENT *pevent, INT8U *err)
85 {
\ OSMutexAccept:
\ 00000000 F0402DE9 PUSH {R4-R7,LR}
\ 00000004 0040B0E1 MOVS R4,R0
\ 00000008 0150B0E1 MOVS R5,R1
86 INT8U pip; /* Priority Inheritance Priority (PIP) */
87 #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
88 OS_CPU_SR cpu_sr = 0;
\ 0000000C 0000A0E3 MOV R0,#+0
\ 00000010 0070B0E1 MOVS R7,R0
89 #endif
90
91
92
93 #if OS_ARG_CHK_EN > 0
94 if (err == (INT8U *)0) { /* Validate 'err' */
\ 00000014 000055E3 CMP R5,#+0
\ 00000018 0100001A BNE ??OSMutexAccept_0
95 return (0);
\ 0000001C 0000A0E3 MOV R0,#+0
\ 00000020 3F0000EA B ??OSMutexAccept_1
96 }
97 if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
\ ??OSMutexAccept_0:
\ 00000024 000054E3 CMP R4,#+0
\ 00000028 0300001A BNE ??OSMutexAccept_2
98 *err = OS_ERR_PEVENT_NULL;
\ 0000002C 0400A0E3 MOV R0,#+4
\ 00000030 0000C5E5 STRB R0,[R5, #+0]
99 return (0);
\ 00000034 0000A0E3 MOV R0,#+0
\ 00000038 390000EA B ??OSMutexAccept_1
100 }
101 #endif
102 if (pevent->OSEventType != OS_EVENT_TYPE_MUTEX) { /* Validate event block type */
\ ??OSMutexAccept_2:
\ 0000003C 0000D4E5 LDRB R0,[R4, #+0]
\ 00000040 040050E3 CMP R0,#+4
\ 00000044 0300000A BEQ ??OSMutexAccept_3
103 *err = OS_ERR_EVENT_TYPE;
\ 00000048 0100A0E3 MOV R0,#+1
\ 0000004C 0000C5E5 STRB R0,[R5, #+0]
104 return (0);
\ 00000050 0000A0E3 MOV R0,#+0
\ 00000054 320000EA B ??OSMutexAccept_1
105 }
106 if (OSIntNesting > 0) { /* Make sure it's not called from an ISR */
\ ??OSMutexAccept_3:
\ 00000058 ........ LDR R0,??DataTable47 ;; OSIntNesting
\ 0000005C 0000D0E5 LDRB R0,[R0, #+0]
\ 00000060 010050E3 CMP R0,#+1
\ 00000064 0300003A BCC ??OSMutexAccept_4
107 *err = OS_ERR_PEND_ISR;
\ 00000068 0200A0E3 MOV R0,#+2
\ 0000006C 0000C5E5 STRB R0,[R5, #+0]
108 return (0);
\ 00000070 0000A0E3 MOV R0,#+0
\ 00000074 2A0000EA B ??OSMutexAccept_1
109 }
110 OS_ENTER_CRITICAL(); /* Get value (0 or 1) of Mutex */
\ ??OSMutexAccept_4:
\ 00000078 ........ _BLF OS_CPU_SR_Save,??OS_CPU_SR_Save??rA
\ 0000007C 0070B0E1 MOVS R7,R0
111 pip = (INT8U)(pevent->OSEventCnt >> 8); /* Get PIP from mutex */
\ 00000080 B800D4E1 LDRH R0,[R4, #+8]
\ 00000084 2004B0E1 LSRS R0,R0,#+8
\ 00000088 0060B0E1 MOVS R6,R0
112 if ((pevent->OSEventCnt & OS_MUTEX_KEEP_LOWER_8) == OS_MUTEX_AVAILABLE) {
\ 0000008C B800D4E1 LDRH R0,[R4, #+8]
\ 00000090 FF0010E2 ANDS R0,R0,#0xFF
\ 00000094 FF0050E3 CMP R0,#+255
\ 00000098 1C00001A BNE ??OSMutexAccept_5
113 pevent->OSEventCnt &= OS_MUTEX_KEEP_UPPER_8; /* Mask off LSByte (Acquire Mutex) */
\ 0000009C B800D4E1 LDRH R0,[R4, #+8]
\ 000000A0 FF0C10E2 ANDS R0,R0,#0xFF00
\ 000000A4 B800C4E1 STRH R0,[R4, #+8]
114 pevent->OSEventCnt |= OSTCBCur->OSTCBPrio; /* Save current task priority in LSByte */
\ 000000A8 B800D4E1 LDRH R0,[R4, #+8]
\ 000000AC ........ LDR R1,??DataTable44 ;; OSTCBCur
\ 000000B0 001091E5 LDR R1,[R1, #+0]
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -