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annotate nspr/pr/include/prlock.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: prlock.h
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8 ** Description: API to basic locking functions of NSPR.
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9 **
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10 **
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11 ** NSPR provides basic locking mechanisms for thread synchronization. Locks
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12 ** are lightweight resource contention controls that prevent multiple threads
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13 ** from accessing something (code/data) simultaneously.
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14 **/
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15
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16 #ifndef prlock_h___
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17 #define prlock_h___
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18
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19 #include "prtypes.h"
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20
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21 PR_BEGIN_EXTERN_C
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22
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23 /**********************************************************************/
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24 /************************* TYPES AND CONSTANTS ************************/
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25 /**********************************************************************/
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26
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27 /*
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28 * PRLock --
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29 *
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30 * NSPR represents the lock as an opaque entity to the client of the
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31 * API. All routines operate on a pointer to this opaque entity.
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32 */
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33
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34 typedef struct PRLock PRLock;
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35
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36 /**********************************************************************/
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37 /****************************** FUNCTIONS *****************************/
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38 /**********************************************************************/
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39
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40 /***********************************************************************
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41 ** FUNCTION: PR_NewLock
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42 ** DESCRIPTION:
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43 ** Returns a pointer to a newly created opaque lock object.
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44 ** INPUTS: void
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45 ** OUTPUTS: void
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46 ** RETURN: PRLock*
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47 ** If the lock can not be created because of resource constraints, NULL
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48 ** is returned.
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49 **
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50 ***********************************************************************/
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51 NSPR_API(PRLock*) PR_NewLock(void);
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52
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53 /***********************************************************************
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54 ** FUNCTION: PR_DestroyLock
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55 ** DESCRIPTION:
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56 ** Destroys a given opaque lock object.
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57 ** INPUTS: PRLock *lock
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58 ** Lock to be freed.
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59 ** OUTPUTS: void
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60 ** RETURN: None
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61 ***********************************************************************/
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62 NSPR_API(void) PR_DestroyLock(PRLock *lock);
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63
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64 /***********************************************************************
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65 ** FUNCTION: PR_Lock
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66 ** DESCRIPTION:
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67 ** Lock a lock.
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68 ** INPUTS: PRLock *lock
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69 ** Lock to locked.
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70 ** OUTPUTS: void
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71 ** RETURN: None
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72 ***********************************************************************/
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73 NSPR_API(void) PR_Lock(PRLock *lock);
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74
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75 /***********************************************************************
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76 ** FUNCTION: PR_Unlock
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77 ** DESCRIPTION:
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78 ** Unlock a lock. Unlocking an unlocked lock has undefined results.
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79 ** INPUTS: PRLock *lock
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80 ** Lock to unlocked.
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81 ** OUTPUTS: void
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82 ** RETURN: PR_STATUS
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83 ** Returns PR_FAILURE if the caller does not own the lock.
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84 ***********************************************************************/
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85 NSPR_API(PRStatus) PR_Unlock(PRLock *lock);
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86
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87 /***********************************************************************
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88 ** MACRO: PR_ASSERT_CURRENT_THREAD_OWNS_LOCK
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89 ** DESCRIPTION:
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90 ** If the current thread owns |lock|, this assertion is guaranteed to
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91 ** succeed. Otherwise, the behavior of this function is undefined.
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92 ** INPUTS: PRLock *lock
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93 ** Lock to assert ownership of.
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94 ** OUTPUTS: void
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95 ** RETURN: None
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96 ***********************************************************************/
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97 #if defined(DEBUG) || defined(FORCE_PR_ASSERT)
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98 #define PR_ASSERT_CURRENT_THREAD_OWNS_LOCK(/* PrLock* */ lock) \
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99 PR_AssertCurrentThreadOwnsLock(lock)
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100 #else
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101 #define PR_ASSERT_CURRENT_THREAD_OWNS_LOCK(/* PrLock* */ lock)
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102 #endif
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103
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104 /* Don't call this function directly. */
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105 NSPR_API(void) PR_AssertCurrentThreadOwnsLock(PRLock *lock);
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106
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107 PR_END_EXTERN_C
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108
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109 #endif /* prlock_h___ */
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