📄 os_mutex.lst
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# #
# IAR ARM ANSI C/C++ Compiler V4.42A/W32 KICKSTART 26/Dec/2008 18:22:03 #
# Copyright 1999-2005 IAR Systems. All rights reserved. #
# #
# Cpu mode = thumb #
# Endian = little #
# Stack alignment = 4 #
# Source file = F:\PROJECT\STM32_UCOSII\uCOS-II\Source\os_mutex.c #
# Command line = F:\PROJECT\STM32_UCOSII\uCOS-II\Source\os_mutex.c #
# -lCN F:\PROJECT\STM32_UCOSII\EvalBoards\ST\STM3210E- #
# EVAL\IAR\OS-Probe\Flash\List\ -o #
# F:\PROJECT\STM32_UCOSII\EvalBoards\ST\STM3210E-EVAL\ #
# IAR\OS-Probe\Flash\Obj\ -z6 --no_unroll --no_inline #
# --no_tbaa --no_scheduling --debug --cpu_mode thumb #
# --endian little --cpu cortex-M3 --stack_align 4 -e #
# --fpu None --dlib_config "E:\Program Files\IAR #
# Systems\Embedded Workbench 4.0 #
# Kickstart\arm\LIB\dl7mptnnl8n.h" -I #
# F:\PROJECT\STM32_UCOSII\EvalBoards\ST\STM3210E-EVAL\ #
# IAR\OS-Probe\ -I F:\PROJECT\STM32_UCOSII\EvalBoards\ #
# ST\STM3210E-EVAL\IAR\OS-Probe\..\BSP\ -I #
# F:\PROJECT\STM32_UCOSII\EvalBoards\ST\STM3210E-EVAL\ #
# IAR\OS-Probe\..\..\..\..\..\CPU\ST\STM32\inc\ -I #
# F:\PROJECT\STM32_UCOSII\EvalBoards\ST\STM3210E-EVAL\ #
# IAR\OS-Probe\..\..\..\..\..\uC-CPU\ -I #
# F:\PROJECT\STM32_UCOSII\EvalBoards\ST\STM3210E-EVAL\ #
# IAR\OS-Probe\..\..\..\..\..\uC-CPU\ARM-Cortex-M3\IAR #
# \ -I F:\PROJECT\STM32_UCOSII\EvalBoards\ST\STM3210E- #
# EVAL\IAR\OS-Probe\..\..\..\..\..\uC-LCD\Source\ -I #
# F:\PROJECT\STM32_UCOSII\EvalBoards\ST\STM3210E-EVAL\ #
# IAR\OS-Probe\..\..\..\..\..\uC-LIB\ -I #
# F:\PROJECT\STM32_UCOSII\EvalBoards\ST\STM3210E-EVAL\ #
# IAR\OS-Probe\..\..\..\..\..\uCOS-II\Ports\ARM-Cortex #
# -M3\Generic\IAR\ -I F:\PROJECT\STM32_UCOSII\EvalBoar #
# ds\ST\STM3210E-EVAL\IAR\OS-Probe\..\..\..\..\..\uCOS #
# -II\Source\ -I F:\PROJECT\STM32_UCOSII\EvalBoards\ST #
# \STM3210E-EVAL\IAR\OS-Probe\..\..\..\..\..\uC-Probe\ #
# Target\Communication\Generic\RS-232\Source\ -I #
# F:\PROJECT\STM32_UCOSII\EvalBoards\ST\STM3210E-EVAL\ #
# IAR\OS-Probe\..\..\..\..\..\uC-Probe\Target\Communic #
# ation\Generic\RS-232\Ports\ST\STM32\ -I #
# F:\PROJECT\STM32_UCOSII\EvalBoards\ST\STM3210E-EVAL\ #
# IAR\OS-Probe\..\..\..\..\..\uC-Probe\Target\Communic #
# ation\Generic\Source\ -I F:\PROJECT\STM32_UCOSII\Eva #
# lBoards\ST\STM3210E-EVAL\IAR\OS-Probe\..\..\..\..\.. #
# \uC-Probe\Target\Plugins\uCOS-II\ -I "E:\Program #
# Files\IAR Systems\Embedded Workbench 4.0 #
# Kickstart\arm\INC\" #
# List file = F:\PROJECT\STM32_UCOSII\EvalBoards\ST\STM3210E-EVAL\ #
# IAR\OS-Probe\Flash\List\os_mutex.lst #
# Object file = F:\PROJECT\STM32_UCOSII\EvalBoards\ST\STM3210E-EVAL\ #
# IAR\OS-Probe\Flash\Obj\os_mutex.r79 #
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F:\PROJECT\STM32_UCOSII\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, Micrium, Weston, FL
8 * All Rights Reserved
9 *
10 * File : OS_MUTEX.C
11 * By : Jean J. Labrosse
12 * Version : V2.86
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 ((INT16U)0x00FFu)
37 #define OS_MUTEX_KEEP_UPPER_8 ((INT16U)0xFF00u)
38
39 #define OS_MUTEX_AVAILABLE ((INT16U)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 * perr 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 : == OS_TRUE if the resource is available, the mutual exclusion semaphore is acquired
74 * == OS_FALSE 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
84 BOOLEAN OSMutexAccept (OS_EVENT *pevent, INT8U *perr)
85 {
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;
89 #endif
90
91
92
93 #if OS_ARG_CHK_EN > 0
94 if (perr == (INT8U *)0) { /* Validate 'perr' */
95 return (OS_FALSE);
96 }
97 if (pevent == (OS_EVENT *)0) { /* Validate 'pevent' */
98 *perr = OS_ERR_PEVENT_NULL;
99 return (OS_FALSE);
100 }
101 #endif
102 if (pevent->OSEventType != OS_EVENT_TYPE_MUTEX) { /* Validate event block type */
103 *perr = OS_ERR_EVENT_TYPE;
104 return (OS_FALSE);
105 }
106 if (OSIntNesting > 0) { /* Make sure it's not called from an ISR */
107 *perr = OS_ERR_PEND_ISR;
108 return (OS_FALSE);
109 }
110 OS_ENTER_CRITICAL(); /* Get value (0 or 1) of Mutex */
111 pip = (INT8U)(pevent->OSEventCnt >> 8); /* Get PIP from mutex */
112 if ((pevent->OSEventCnt & OS_MUTEX_KEEP_LOWER_8) == OS_MUTEX_AVAILABLE) {
113 pevent->OSEventCnt &= OS_MUTEX_KEEP_UPPER_8; /* Mask off LSByte (Acquire Mutex) */
114 pevent->OSEventCnt |= OSTCBCur->OSTCBPrio; /* Save current task priority in LSByte */
115 pevent->OSEventPtr = (void *)OSTCBCur; /* Link TCB of task owning Mutex */
116 if (OSTCBCur->OSTCBPrio <= pip) { /* PIP 'must' have a SMALLER prio ... */
117 OS_EXIT_CRITICAL(); /* ... than current task! */
118 *perr = OS_ERR_PIP_LOWER;
119 } else {
120 OS_EXIT_CRITICAL();
121 *perr = OS_ERR_NONE;
122 }
123 return (OS_TRUE);
124 }
125 OS_EXIT_CRITICAL();
126 *perr = OS_ERR_NONE;
127 return (OS_FALSE);
128 }
129 #endif
130
131 /*$PAGE*/
132 /*
133 *********************************************************************************************************
134 * CREATE A MUTUAL EXCLUSION SEMAPHORE
135 *
136 * Description: This function creates a mutual exclusion semaphore.
137 *
138 * Arguments : prio is the priority to use when accessing the mutual exclusion semaphore. In
139 * other words, when the semaphore is acquired and a higher priority task
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