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1 office 1 /**
2 * @file
3 * lwIP Operating System abstraction
4 *
5 */
6  
7 /*
8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without modification,
12 * are permitted provided that the following conditions are met:
13 *
14 * 1. Redistributions of source code must retain the above copyright notice,
15 * this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright notice,
17 * this list of conditions and the following disclaimer in the documentation
18 * and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote products
20 * derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
23 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
25 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
27 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
30 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
31 * OF SUCH DAMAGE.
32 *
33 * This file is part of the lwIP TCP/IP stack.
34 *
35 * Author: Adam Dunkels <adam@sics.se>
36 *
37 */
38  
39 /**
40 * @defgroup sys_layer Porting (system abstraction layer)
41 * @ingroup lwip
42 * @verbinclude "sys_arch.txt"
43 *
44 * @defgroup sys_os OS abstraction layer
45 * @ingroup sys_layer
46 * No need to implement functions in this section in NO_SYS mode.
47 *
48 * @defgroup sys_sem Semaphores
49 * @ingroup sys_os
50 *
51 * @defgroup sys_mutex Mutexes
52 * @ingroup sys_os
53 * Mutexes are recommended to correctly handle priority inversion,
54 * especially if you use LWIP_CORE_LOCKING .
55 *
56 * @defgroup sys_mbox Mailboxes
57 * @ingroup sys_os
58 *
59 * @defgroup sys_time Time
60 * @ingroup sys_layer
61 *
62 * @defgroup sys_prot Critical sections
63 * @ingroup sys_layer
64 * Used to protect short regions of code against concurrent access.
65 * - Your system is a bare-metal system (probably with an RTOS)
66 * and interrupts are under your control:
67 * Implement this as LockInterrupts() / UnlockInterrupts()
68 * - Your system uses an RTOS with deferred interrupt handling from a
69 * worker thread: Implement as a global mutex or lock/unlock scheduler
70 * - Your system uses a high-level OS with e.g. POSIX signals:
71 * Implement as a global mutex
72 *
73 * @defgroup sys_misc Misc
74 * @ingroup sys_os
75 */
76  
77 #include "lwip/opt.h"
78  
79 #include "lwip/sys.h"
80  
81 /* Most of the functions defined in sys.h must be implemented in the
82 * architecture-dependent file sys_arch.c */
83  
84 #if !NO_SYS
85  
86 #ifndef sys_msleep
87 /**
88 * Sleep for some ms. Timeouts are NOT processed while sleeping.
89 *
90 * @param ms number of milliseconds to sleep
91 */
92 void
93 sys_msleep(u32_t ms)
94 {
95 if (ms > 0) {
96 sys_sem_t delaysem;
97 err_t err = sys_sem_new(&delaysem, 0);
98 if (err == ERR_OK) {
99 sys_arch_sem_wait(&delaysem, ms);
100 sys_sem_free(&delaysem);
101 }
102 }
103 }
104 #endif /* sys_msleep */
105  
106 #endif /* !NO_SYS */