Mercurial > trustbridge > nss-cmake-static

annotate nss/lib/util/nssrwlk.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 /* This Source Code Form is subject to the terms of the Mozilla Public
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2 * License, v. 2.0. If a copy of the MPL was not distributed with this
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3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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4
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5 /*
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6 ** File: nsrwlock.h
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7 ** Description: API to basic reader-writer lock functions of NSS.
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8 ** These are re-entrant reader writer locks; that is,
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9 ** If I hold the write lock, I can ask for it and get it again.
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10 ** If I hold the write lock, I can also ask for and get a read lock.
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11 ** I can then release the locks in any order (read or write).
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12 ** I must release each lock type as many times as I acquired it.
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13 ** Otherwise, these are normal reader/writer locks.
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14 **
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15 ** For deadlock detection, locks should be ranked, and no lock may be aquired
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16 ** while I hold a lock of higher rank number.
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17 ** If you don't want that feature, always use NSS_RWLOCK_RANK_NONE.
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18 ** Lock name is for debugging, and is optional (may be NULL)
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19 **/
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20
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21 #ifndef nssrwlk_h___
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22 #define nssrwlk_h___
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23
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24 #include "utilrename.h"
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25 #include "prtypes.h"
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26 #include "nssrwlkt.h"
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27
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28 #define NSS_RWLOCK_RANK_NONE 0
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29
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30 /* SEC_BEGIN_PROTOS */
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31 PR_BEGIN_EXTERN_C
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32
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33 /***********************************************************************
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34 ** FUNCTION: NSSRWLock_New
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35 ** DESCRIPTION:
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36 ** Returns a pointer to a newly created reader-writer lock object.
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37 ** INPUTS: Lock rank
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38 ** Lock name
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39 ** OUTPUTS: void
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40 ** RETURN: NSSRWLock*
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41 ** If the lock cannot be created because of resource constraints, NULL
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42 ** is returned.
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43 **
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44 ***********************************************************************/
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45 extern NSSRWLock* NSSRWLock_New(PRUint32 lock_rank, const char *lock_name);
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46
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47 /***********************************************************************
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48 ** FUNCTION: NSSRWLock_AtomicCreate
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49 ** DESCRIPTION:
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50 ** Given the address of a NULL pointer to a NSSRWLock,
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51 ** atomically initializes that pointer to a newly created NSSRWLock.
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52 ** Returns the value placed into that pointer, or NULL.
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53 **
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54 ** INPUTS: address of NSRWLock pointer
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55 ** Lock rank
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56 ** Lock name
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57 ** OUTPUTS: NSSRWLock*
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58 ** RETURN: NSSRWLock*
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59 ** If the lock cannot be created because of resource constraints,
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60 ** the pointer will be left NULL.
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61 **
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62 ***********************************************************************/
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63 extern NSSRWLock *
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64 nssRWLock_AtomicCreate( NSSRWLock ** prwlock,
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65 PRUint32 lock_rank,
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66 const char * lock_name);
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67
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68 /***********************************************************************
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69 ** FUNCTION: NSSRWLock_Destroy
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70 ** DESCRIPTION:
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71 ** Destroys a given RW lock object.
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72 ** INPUTS: NSSRWLock *lock - Lock to be freed.
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73 ** OUTPUTS: void
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74 ** RETURN: None
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75 ***********************************************************************/
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76 extern void NSSRWLock_Destroy(NSSRWLock *lock);
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77
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78 /***********************************************************************
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79 ** FUNCTION: NSSRWLock_LockRead
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80 ** DESCRIPTION:
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81 ** Apply a read lock (non-exclusive) on a RWLock
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82 ** INPUTS: NSSRWLock *lock - Lock to be read-locked.
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83 ** OUTPUTS: void
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84 ** RETURN: None
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85 ***********************************************************************/
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86 extern void NSSRWLock_LockRead(NSSRWLock *lock);
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87
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88 /***********************************************************************
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89 ** FUNCTION: NSSRWLock_LockWrite
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90 ** DESCRIPTION:
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91 ** Apply a write lock (exclusive) on a RWLock
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92 ** INPUTS: NSSRWLock *lock - Lock to write-locked.
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93 ** OUTPUTS: void
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94 ** RETURN: None
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95 ***********************************************************************/
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96 extern void NSSRWLock_LockWrite(NSSRWLock *lock);
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97
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98 /***********************************************************************
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99 ** FUNCTION: NSSRWLock_UnlockRead
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100 ** DESCRIPTION:
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101 ** Release a Read lock. Unlocking an unlocked lock has undefined results.
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102 ** INPUTS: NSSRWLock *lock - Lock to unlocked.
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103 ** OUTPUTS: void
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104 ** RETURN: void
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105 ***********************************************************************/
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106 extern void NSSRWLock_UnlockRead(NSSRWLock *lock);
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107
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108 /***********************************************************************
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109 ** FUNCTION: NSSRWLock_UnlockWrite
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110 ** DESCRIPTION:
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111 ** Release a Write lock. Unlocking an unlocked lock has undefined results.
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112 ** INPUTS: NSSRWLock *lock - Lock to unlocked.
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113 ** OUTPUTS: void
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114 ** RETURN: void
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115 ***********************************************************************/
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116 extern void NSSRWLock_UnlockWrite(NSSRWLock *lock);
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117
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118 /***********************************************************************
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119 ** FUNCTION: NSSRWLock_HaveWriteLock
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120 ** DESCRIPTION:
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121 ** Tells caller whether the current thread holds the write lock, or not.
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122 ** INPUTS: NSSRWLock *lock - Lock to test.
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123 ** OUTPUTS: void
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124 ** RETURN: PRBool PR_TRUE IFF the current thread holds the write lock.
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125 ***********************************************************************/
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126
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127 extern PRBool NSSRWLock_HaveWriteLock(NSSRWLock *rwlock);
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128
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129 /* SEC_END_PROTOS */
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130 PR_END_EXTERN_C
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diff changeset
131
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
132 #endif /* nsrwlock_h___ */
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