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annotate packages/compat/posix/current/include/semaphore.h @ 3292:7f8e529b4d82 default tip

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Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
author vae
date Wed, 29 Apr 2015 23:31:48 +0000
parents 74dbf4c3f2e1
children
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1 #ifndef CYGONCE_SEMAPHORE_H
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2 #define CYGONCE_SEMAPHORE_H
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3 //=============================================================================
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4 //
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5 // semaphore.h
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6 //
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7 // POSIX semaphore header
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8 //
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9 //=============================================================================
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10 // ####ECOSGPLCOPYRIGHTBEGIN####
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11 // -------------------------------------------
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12 // This file is part of eCos, the Embedded Configurable Operating System.
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13 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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14 //
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15 // eCos is free software; you can redistribute it and/or modify it under
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16 // the terms of the GNU General Public License as published by the Free
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17 // Software Foundation; either version 2 or (at your option) any later
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18 // version.
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19 //
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20 // eCos is distributed in the hope that it will be useful, but WITHOUT
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21 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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22 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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23 // for more details.
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24 //
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25 // You should have received a copy of the GNU General Public License
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26 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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27 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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28 //
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29 // As a special exception, if other files instantiate templates or use
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30 // macros or inline functions from this file, or you compile this file
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31 // and link it with other works to produce a work based on this file,
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32 // this file does not by itself cause the resulting work to be covered by
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33 // the GNU General Public License. However the source code for this file
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34 // must still be made available in accordance with section (3) of the GNU
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35 // General Public License v2.
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36 //
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37 // This exception does not invalidate any other reasons why a work based
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38 // on this file might be covered by the GNU General Public License.
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39 // -------------------------------------------
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40 // ####ECOSGPLCOPYRIGHTEND####
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41 //=============================================================================
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42 //#####DESCRIPTIONBEGIN####
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43 //
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44 // Author(s): nickg
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45 // Contributors: nickg
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46 // Date: 2000-03-17
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47 // Purpose: POSIX semaphore header
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48 // Description: This header contains all the definitions needed to support
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49 // semaphores under eCos. The reader is referred to the POSIX
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50 // standard or equivalent documentation for details of the
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51 // functionality contained herein.
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52 //
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53 // Usage:
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54 // #include <semaphore.h>
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55 // ...
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56 //
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57 //
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58 //####DESCRIPTIONEND####
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59 //
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60 //=============================================================================
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61
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62 #include <pkgconf/hal.h>
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63 #include <pkgconf/kernel.h>
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64 #include <pkgconf/posix.h>
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65
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66 #include <stddef.h> // NULL, size_t
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67
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68 #include <limits.h>
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69
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70 #include <sys/types.h>
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71
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72 //-----------------------------------------------------------------------------
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73 // Semaphore object definition
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74
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75 // This structure must exactly correspond in size and layout to the underlying
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76 // eCos C++ class that implements this object.
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77
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78 typedef struct
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79 {
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80 CYG_WORD32 sem_value;
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81 CYG_ADDRESS sem_queue;
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82 } sem_t;
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83
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84 //-----------------------------------------------------------------------------
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85 // Semaphore functions
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86
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87 // Initialize semaphore to value.
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88 // pshared is not supported under eCos.
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89 externC int sem_init (sem_t *sem, int pshared, unsigned int value);
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90
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91 // Destroy the semaphore.
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92 externC int sem_destroy (sem_t *sem);
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93
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94 // Decrement value if >0 or wait for a post.
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95 externC int sem_wait (sem_t *sem);
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96
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97 // Decrement value if >0, return -1 if not.
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98 externC int sem_trywait (sem_t *sem);
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99
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100 // Increment value and wake a waiter if one is present.
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101 externC int sem_post (sem_t *sem);
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102
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103 // Get current value
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104 externC int sem_getvalue (sem_t *sem, int *sval);
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105
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106 //-----------------------------------------------------------------------------
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107 // Named semaphore functions
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108 // These are an optional feature under eCos
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109
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110 // Open an existing named semaphore, or create it.
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111 externC sem_t *sem_open (const char *name, int oflag, ...);
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112
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113 // Close descriptor for semaphore.
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114 externC int sem_close (sem_t *sem);
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115
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116 // Remove named semaphore
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117 externC int sem_unlink (const char *name);
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118
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119 //-----------------------------------------------------------------------------
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120 // Special return value for sem_open()
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121
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122 #define SEM_FAILED ((sem_t *)NULL)
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123
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124 //-----------------------------------------------------------------------------
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125 #endif // ifndef CYGONCE_SEMAPHORE_H
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126 // End of semaphore.h