scoutos / prex-0.9.0 / sys / include / sync.h @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2005-2008, Kohsuke Ohtani
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3 | * All rights reserved.
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4 | *
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5 | * Redistribution and use in source and binary forms, with or without
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6 | * modification, are permitted provided that the following conditions
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7 | * are met:
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8 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | #ifndef _SYNC_H
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31 | #define _SYNC_H
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32 | |||
33 | #include <types.h> |
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34 | #include <sys/cdefs.h> |
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35 | #include <sys/list.h> |
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36 | #include <event.h> |
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37 | |||
38 | struct sem {
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39 | struct sem *next; /* linkage on semaphore list in system */ |
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40 | struct list task_link; /* linkage on semaphore list in task */ |
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41 | task_t owner; /* owner task */
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42 | struct event event; /* event */ |
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43 | u_int value; /* current value */
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44 | int refcnt; /* reference count */ |
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45 | }; |
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46 | |||
47 | struct mutex {
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48 | struct list task_link; /* linkage on mutex list in task */ |
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49 | task_t owner; /* owner task */
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50 | struct event event; /* event */ |
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51 | struct list link; /* linkage on locked mutex list */ |
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52 | thread_t holder; /* thread that holds the mutex */
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53 | int priority; /* highest priority in waiting threads */ |
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54 | int locks; /* counter for recursive lock */ |
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55 | }; |
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56 | |||
57 | struct cond {
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58 | struct list task_link; /* linkage on cv list in task */ |
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59 | task_t owner; /* owner task */
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60 | struct event event; /* event */ |
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61 | }; |
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62 | |||
63 | /* maximum value for semaphore. */
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64 | #define MAXSEMVAL ((u_int)((~0u) >> 1)) |
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65 | |||
66 | /* max mutex count to inherit priority */
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67 | #define MAXINHERIT 10 |
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68 | |||
69 | #define MUTEX_INITIALIZER (mutex_t)0x4d496e69 /* 'MIni' */ |
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70 | #define COND_INITIALIZER (cond_t)0x43496e69 /* 'CIni' */ |
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71 | |||
72 | __BEGIN_DECLS |
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73 | int sem_init(sem_t *, u_int);
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74 | int sem_destroy(sem_t *);
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75 | int sem_wait(sem_t *, u_long);
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76 | int sem_trywait(sem_t *);
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77 | int sem_post(sem_t *);
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78 | int sem_getvalue(sem_t *, u_int *);
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79 | void sem_cleanup(task_t);
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80 | |||
81 | int mutex_init(mutex_t *);
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82 | int mutex_destroy(mutex_t *);
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83 | int mutex_lock(mutex_t *);
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84 | int mutex_trylock(mutex_t *);
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85 | int mutex_unlock(mutex_t *);
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86 | void mutex_cancel(thread_t);
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87 | void mutex_setpri(thread_t, int); |
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88 | void mutex_cleanup(task_t);
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89 | |||
90 | int cond_init(cond_t *);
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91 | int cond_destroy(cond_t *);
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92 | int cond_wait(cond_t *, mutex_t *);
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93 | int cond_signal(cond_t *);
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94 | int cond_broadcast(cond_t *);
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95 | void cond_cleanup(task_t);
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96 | __END_DECLS |
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97 | |||
98 | #endif /* !_SYNC_H */ |