lwip_sys.c

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 */