Marco Zecchini
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Example_RTOS
Rtos API example
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lwip_sys.c
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00001 /** 00002 * @file 00003 * lwIP Operating System abstraction 00004 * 00005 */ 00006 00007 /* 00008 * Copyright (c) 2001-2004 Swedish Institute of Computer Science. 00009 * All rights reserved. 00010 * 00011 * Redistribution and use in source and binary forms, with or without modification, 00012 * are permitted provided that the following conditions are met: 00013 * 00014 * 1. Redistributions of source code must retain the above copyright notice, 00015 * this list of conditions and the following disclaimer. 00016 * 2. Redistributions in binary form must reproduce the above copyright notice, 00017 * this list of conditions and the following disclaimer in the documentation 00018 * and/or other materials provided with the distribution. 00019 * 3. The name of the author may not be used to endorse or promote products 00020 * derived from this software without specific prior written permission. 00021 * 00022 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 00023 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 00024 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 00025 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00026 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT 00027 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 00028 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 00029 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 00030 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY 00031 * OF SUCH DAMAGE. 00032 * 00033 * This file is part of the lwIP TCP/IP stack. 00034 * 00035 * Author: Adam Dunkels <adam@sics.se> 00036 * 00037 */ 00038 00039 /** 00040 * @defgroup sys_layer Porting (system abstraction layer) 00041 * @ingroup lwip 00042 * @verbinclude "sys_arch.txt" 00043 * 00044 * @defgroup sys_os OS abstraction layer 00045 * @ingroup sys_layer 00046 * No need to implement functions in this section in NO_SYS mode. 00047 * 00048 * @defgroup sys_sem Semaphores 00049 * @ingroup sys_os 00050 * 00051 * @defgroup sys_mutex Mutexes 00052 * @ingroup sys_os 00053 * Mutexes are recommended to correctly handle priority inversion, 00054 * especially if you use LWIP_CORE_LOCKING . 00055 * 00056 * @defgroup sys_mbox Mailboxes 00057 * @ingroup sys_os 00058 * 00059 * @defgroup sys_time Time 00060 * @ingroup sys_layer 00061 * 00062 * @defgroup sys_prot Critical sections 00063 * @ingroup sys_layer 00064 * Used to protect short regions of code against concurrent access. 00065 * - Your system is a bare-metal system (probably with an RTOS) 00066 * and interrupts are under your control: 00067 * Implement this as LockInterrupts() / UnlockInterrupts() 00068 * - Your system uses an RTOS with deferred interrupt handling from a 00069 * worker thread: Implement as a global mutex or lock/unlock scheduler 00070 * - Your system uses a high-level OS with e.g. POSIX signals: 00071 * Implement as a global mutex 00072 * 00073 * @defgroup sys_misc Misc 00074 * @ingroup sys_os 00075 */ 00076 00077 #include "lwip/opt.h" 00078 00079 #include "lwip/sys.h" 00080 00081 /* Most of the functions defined in sys.h must be implemented in the 00082 * architecture-dependent file sys_arch.c */ 00083 00084 #if !NO_SYS 00085 00086 #ifndef sys_msleep 00087 /** 00088 * Sleep for some ms. Timeouts are NOT processed while sleeping. 00089 * 00090 * @param ms number of milliseconds to sleep 00091 */ 00092 void 00093 sys_msleep(u32_t ms) 00094 { 00095 if (ms > 0) { 00096 sys_sem_t delaysem; 00097 err_t err = sys_sem_new(&delaysem, 0); 00098 if (err == ERR_OK) { 00099 sys_arch_sem_wait(&delaysem, ms); 00100 sys_sem_free(&delaysem); 00101 } 00102 } 00103 } 00104 #endif /* sys_msleep */ 00105 00106 #endif /* !NO_SYS */
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