📄 os_sem.lst
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##############################################################################
# #
# IAR ARM ANSI C/C++ Compiler V4.42A/W32 EVALUATION 12/Dec/2008 17:14:26 #
# 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_sem.c #
# Command line = E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\UCOS-II\uCOS-II #
# \Source\os_sem.c -lCN E:\IAR_2478\IAR_2478\26uCOS\Sr #
# c\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_sem.lst #
# Object file = E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\RAM_Debug\Obj\o #
# s_sem.r79 #
# #
# #
##############################################################################
E:\IAR_2478\IAR_2478\26uCOS\Src\uCOS\UCOS-II\uCOS-II\Source\os_sem.c
1 /*
2 *********************************************************************************************************
3 * uC/OS-II
4 * The Real-Time Kernel
5 * SEMAPHORE MANAGEMENT
6 *
7 * (c) Copyright 1992-2007, Jean J. Labrosse, Weston, FL
8 * All Rights Reserved
9 *
10 * File : OS_SEM.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 #if OS_SEM_EN > 0
29 /*$PAGE*/
30 /*
31 *********************************************************************************************************
32 * ACCEPT SEMAPHORE
33 *
34 * Description: This function checks the semaphore to see if a resource is available or, if an event
35 * occurred. Unlike OSSemPend(), OSSemAccept() does not suspend the calling task if the
36 * resource is not available or the event did not occur.
37 *
38 * Arguments : pevent is a pointer to the event control block
39 *
40 * Returns : > 0 if the resource is available or the event did not occur the semaphore is
41 * decremented to obtain the resource.
42 * == 0 if the resource is not available or the event did not occur or,
43 * if 'pevent' is a NULL pointer or,
44 * if you didn't pass a pointer to a semaphore
45 *********************************************************************************************************
46 */
47
48 #if OS_SEM_ACCEPT_EN > 0
\ In segment CODE, align 4, keep-with-next
49 INT16U OSSemAccept (OS_EVENT *pevent)
50 {
\ OSSemAccept:
\ 00000000 70402DE9 PUSH {R4-R6,LR}
\ 00000004 0040B0E1 MOVS R4,R0
51 INT16U cnt;
52 #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
53 OS_CPU_SR cpu_sr = 0;
\ 00000008 0000A0E3 MOV R0,#+0
\ 0000000C 0060B0E1 MOVS R6,R0
54 #endif
55
56
57
58 #if OS_ARG_CHK_EN > 0
59 if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
\ 00000010 000054E3 CMP R4,#+0
\ 00000014 0100001A BNE ??OSSemAccept_0
60 return (0);
\ 00000018 0000A0E3 MOV R0,#+0
\ 0000001C 120000EA B ??OSSemAccept_1
61 }
62 #endif
63 if (pevent->OSEventType != OS_EVENT_TYPE_SEM) { /* Validate event block type */
\ ??OSSemAccept_0:
\ 00000020 0000D4E5 LDRB R0,[R4, #+0]
\ 00000024 030050E3 CMP R0,#+3
\ 00000028 0100000A BEQ ??OSSemAccept_2
64 return (0);
\ 0000002C 0000A0E3 MOV R0,#+0
\ 00000030 0D0000EA B ??OSSemAccept_1
65 }
66 OS_ENTER_CRITICAL();
\ ??OSSemAccept_2:
\ 00000034 ........ _BLF OS_CPU_SR_Save,??OS_CPU_SR_Save??rA
\ 00000038 0060B0E1 MOVS R6,R0
67 cnt = pevent->OSEventCnt;
\ 0000003C B800D4E1 LDRH R0,[R4, #+8]
\ 00000040 0050B0E1 MOVS R5,R0
68 if (cnt > 0) { /* See if resource is available */
\ 00000044 010055E3 CMP R5,#+1
\ 00000048 0400003A BCC ??OSSemAccept_3
69 pevent->OSEventCnt--; /* Yes, decrement semaphore and notify caller */
\ 0000004C B800D4E1 LDRH R0,[R4, #+8]
\ 00000050 FF10A0E3 MOV R1,#+255
\ 00000054 FF1C81E3 ORR R1,R1,#0xFF00
\ 00000058 000091E0 ADDS R0,R1,R0
\ 0000005C B800C4E1 STRH R0,[R4, #+8]
70 }
71 OS_EXIT_CRITICAL();
\ ??OSSemAccept_3:
\ 00000060 0600B0E1 MOVS R0,R6
\ 00000064 ........ _BLF OS_CPU_SR_Restore,??OS_CPU_SR_Restore??rA
72 return (cnt); /* Return semaphore count */
\ 00000068 0500B0E1 MOVS R0,R5
\ ??OSSemAccept_1:
\ 0000006C 7080BDE8 POP {R4-R6,PC} ;; return
73 }
74 #endif
75
76 /*$PAGE*/
77 /*
78 *********************************************************************************************************
79 * CREATE A SEMAPHORE
80 *
81 * Description: This function creates a semaphore.
82 *
83 * Arguments : cnt is the initial value for the semaphore. If the value is 0, no resource is
84 * available (or no event has occurred). You initialize the semaphore to a
85 * non-zero value to specify how many resources are available (e.g. if you have
86 * 10 resources, you would initialize the semaphore to 10).
87 *
88 * Returns : != (void *)0 is a pointer to the event control clock (OS_EVENT) associated with the
89 * created semaphore
90 * == (void *)0 if no event control blocks were available
91 *********************************************************************************************************
92 */
93
\ In segment CODE, align 4, keep-with-next
94 OS_EVENT *OSSemCreate (INT16U cnt)
95 {
\ OSSemCreate:
\ 00000000 70402DE9 PUSH {R4-R6,LR}
\ 00000004 0040B0E1 MOVS R4,R0
96 OS_EVENT *pevent;
97 #if OS_CRITICAL_METHOD == 3 /* Allocate storage for CPU status register */
98 OS_CPU_SR cpu_sr = 0;
\ 00000008 0000A0E3 MOV R0,#+0
\ 0000000C 0060B0E1 MOVS R6,R0
99 #endif
100
101
102
103 if (OSIntNesting > 0) { /* See if called from ISR ... */
\ 00000010 ........ LDR R0,??DataTable10 ;; OSIntNesting
\ 00000014 0000D0E5 LDRB R0,[R0, #+0]
\ 00000018 010050E3 CMP R0,#+1
\ 0000001C 0100003A BCC ??OSSemCreate_0
104 return ((OS_EVENT *)0); /* ... can't CREATE from an ISR */
\ 00000020 0000A0E3 MOV R0,#+0
\ 00000024 1D0000EA B ??OSSemCreate_1
105 }
106 OS_ENTER_CRITICAL();
\ ??OSSemCreate_0:
\ 00000028 ........ _BLF OS_CPU_SR_Save,??OS_CPU_SR_Save??rA
\ 0000002C 0060B0E1 MOVS R6,R0
107 pevent = OSEventFreeList; /* Get next free event control block */
\ 00000030 ........ LDR R0,??DataTable9 ;; OSEventFreeList
\ 00000034 000090E5 LDR R0,[R0, #+0]
\ 00000038 0050B0E1 MOVS R5,R0
108 if (OSEventFreeList != (OS_EVENT *)0) { /* See if pool of free ECB pool was empty */
\ 0000003C ........ LDR R0,??DataTable9 ;; OSEventFreeList
\ 00000040 000090E5 LDR R0,[R0, #+0]
\ 00000044 000050E3 CMP R0,#+0
\ 00000048 0400000A BEQ ??OSSemCreate_2
109 OSEventFreeList = (OS_EVENT *)OSEventFreeList->OSEventPtr;
\ 0000004C ........ LDR R0,??DataTable9 ;; OSEventFreeList
\ 00000050 ........ LDR R1,??DataTable9 ;; OSEventFreeList
\ 00000054 001091E5 LDR R1,[R1, #+0]
\ 00000058 041091E5 LDR R1,[R1, #+4]
\ 0000005C 001080E5 STR R1,[R0, #+0]
110 }
111 OS_EXIT_CRITICAL();
\ ??OSSemCreate_2:
\ 00000060 0600B0E1 MOVS R0,R6
\ 00000064 ........ _BLF OS_CPU_SR_Restore,??OS_CPU_SR_Restore??rA
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