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annotate nspr/pr/include/prrwlock.h @ 4:b513267f632f tip

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Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 /*
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7 ** File: prrwlock.h
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8 ** Description: API to basic reader-writer lock functions of NSPR.
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9 **
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10 **/
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11
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12 #ifndef prrwlock_h___
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13 #define prrwlock_h___
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14
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15 #include "prtypes.h"
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16
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17 PR_BEGIN_EXTERN_C
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18
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19 /*
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20 * PRRWLock --
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21 *
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22 * The reader writer lock, PRRWLock, is an opaque object to the clients
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23 * of NSPR. All routines operate on a pointer to this opaque entity.
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24 */
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25
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26
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27 typedef struct PRRWLock PRRWLock;
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28
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29 #define PR_RWLOCK_RANK_NONE 0
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30
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31
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32 /***********************************************************************
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33 ** FUNCTION: PR_NewRWLock
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34 ** DESCRIPTION:
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35 ** Returns a pointer to a newly created reader-writer lock object.
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36 ** INPUTS: Lock rank
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37 ** Lock name
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38 ** OUTPUTS: void
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39 ** RETURN: PRRWLock*
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40 ** If the lock cannot be created because of resource constraints, NULL
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41 ** is returned.
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42 **
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43 ***********************************************************************/
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44 NSPR_API(PRRWLock*) PR_NewRWLock(PRUint32 lock_rank, const char *lock_name);
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45
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46 /***********************************************************************
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47 ** FUNCTION: PR_DestroyRWLock
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48 ** DESCRIPTION:
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49 ** Destroys a given RW lock object.
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50 ** INPUTS: PRRWLock *lock - Lock to be freed.
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51 ** OUTPUTS: void
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52 ** RETURN: None
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53 ***********************************************************************/
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54 NSPR_API(void) PR_DestroyRWLock(PRRWLock *lock);
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55
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56 /***********************************************************************
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57 ** FUNCTION: PR_RWLock_Rlock
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58 ** DESCRIPTION:
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59 ** Apply a read lock (non-exclusive) on a RWLock
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60 ** INPUTS: PRRWLock *lock - Lock to be read-locked.
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61 ** OUTPUTS: void
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62 ** RETURN: None
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63 ***********************************************************************/
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64 NSPR_API(void) PR_RWLock_Rlock(PRRWLock *lock);
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65
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66 /***********************************************************************
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67 ** FUNCTION: PR_RWLock_Wlock
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68 ** DESCRIPTION:
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69 ** Apply a write lock (exclusive) on a RWLock
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70 ** INPUTS: PRRWLock *lock - Lock to write-locked.
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71 ** OUTPUTS: void
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72 ** RETURN: None
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73 ***********************************************************************/
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74 NSPR_API(void) PR_RWLock_Wlock(PRRWLock *lock);
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75
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76 /***********************************************************************
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77 ** FUNCTION: PR_RWLock_Unlock
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78 ** DESCRIPTION:
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79 ** Release a RW lock. Unlocking an unlocked lock has undefined results.
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80 ** INPUTS: PRRWLock *lock - Lock to unlocked.
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81 ** OUTPUTS: void
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82 ** RETURN: void
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83 ***********************************************************************/
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84 NSPR_API(void) PR_RWLock_Unlock(PRRWLock *lock);
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85
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86 PR_END_EXTERN_C
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87
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88 #endif /* prrwlock_h___ */
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