Mercurial > trustbridge > nss-cmake-static

annotate nss/lib/util/nssrwlk.c @ 0:1e5118fa0cb1

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This is NSS with a Cmake Buildsyste To compile a static NSS library for Windows we've used the Chromium-NSS fork and added a Cmake buildsystem to compile it statically for Windows. See README.chromium for chromium changes and README.trustbridge for our modifications.
author Andre Heinecke <andre.heinecke@intevation.de>
date Mon, 28 Jul 2014 10:47:06 +0200
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children
rev   line source
0
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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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 #include "nssrwlk.h"
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6 #include "nspr.h"
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7
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8 PR_BEGIN_EXTERN_C
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9
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10 /*
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11 * Reader-writer lock
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12 */
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13 struct nssRWLockStr {
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14 PZLock * rw_lock;
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15 char * rw_name; /* lock name */
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16 PRUint32 rw_rank; /* rank of the lock */
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17 PRInt32 rw_writer_locks; /* == 0, if unlocked */
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18 PRInt32 rw_reader_locks; /* == 0, if unlocked */
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19 /* > 0 , # of read locks */
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20 PRUint32 rw_waiting_readers; /* number of waiting readers */
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21 PRUint32 rw_waiting_writers; /* number of waiting writers */
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22 PZCondVar * rw_reader_waitq; /* cvar for readers */
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23 PZCondVar * rw_writer_waitq; /* cvar for writers */
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24 PRThread * rw_owner; /* lock owner for write-lock */
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25 /* Non-null if write lock held. */
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26 };
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27
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28 PR_END_EXTERN_C
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29
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30 #include <string.h>
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31
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32 #ifdef DEBUG_RANK_ORDER
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33 #define NSS_RWLOCK_RANK_ORDER_DEBUG /* enable deadlock detection using
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34 rank-order for locks
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35 */
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36 #endif
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37
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38 #ifdef NSS_RWLOCK_RANK_ORDER_DEBUG
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39
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40 static PRUintn nss_thread_rwlock_initialized;
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41 static PRUintn nss_thread_rwlock; /* TPD key for lock stack */
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42 static PRUintn nss_thread_rwlock_alloc_failed;
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43
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44 #define _NSS_RWLOCK_RANK_ORDER_LIMIT 10
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45
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46 typedef struct thread_rwlock_stack {
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47 PRInt32 trs_index; /* top of stack */
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48 NSSRWLock *trs_stack[_NSS_RWLOCK_RANK_ORDER_LIMIT]; /* stack of lock
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49 pointers */
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50 } thread_rwlock_stack;
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51
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52 /* forward static declarations. */
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53 static PRUint32 nssRWLock_GetThreadRank(PRThread *me);
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54 static void nssRWLock_SetThreadRank(PRThread *me, NSSRWLock *rwlock);
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55 static void nssRWLock_UnsetThreadRank(PRThread *me, NSSRWLock *rwlock);
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56 static void nssRWLock_ReleaseLockStack(void *lock_stack);
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57
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58 #endif
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59
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60 #define UNTIL(x) while(!(x))
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61
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62 /*
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63 * Reader/Writer Locks
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64 */
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65
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66 /*
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67 * NSSRWLock_New
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68 * Create a reader-writer lock, with the given lock rank and lock name
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69 *
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70 */
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71
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72 NSSRWLock *
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73 NSSRWLock_New(PRUint32 lock_rank, const char *lock_name)
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74 {
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75 NSSRWLock *rwlock;
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76
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77 rwlock = PR_NEWZAP(NSSRWLock);
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78 if (rwlock == NULL)
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79 return NULL;
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80
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81 rwlock->rw_lock = PZ_NewLock(nssILockRWLock);
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82 if (rwlock->rw_lock == NULL) {
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83 goto loser;
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84 }
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85 rwlock->rw_reader_waitq = PZ_NewCondVar(rwlock->rw_lock);
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86 if (rwlock->rw_reader_waitq == NULL) {
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87 goto loser;
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88 }
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89 rwlock->rw_writer_waitq = PZ_NewCondVar(rwlock->rw_lock);
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90 if (rwlock->rw_writer_waitq == NULL) {
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91 goto loser;
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92 }
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93 if (lock_name != NULL) {
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94 rwlock->rw_name = (char*) PR_Malloc(strlen(lock_name) + 1);
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95 if (rwlock->rw_name == NULL) {
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96 goto loser;
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97 }
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98 strcpy(rwlock->rw_name, lock_name);
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99 } else {
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100 rwlock->rw_name = NULL;
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101 }
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102 rwlock->rw_rank = lock_rank;
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103 rwlock->rw_waiting_readers = 0;
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104 rwlock->rw_waiting_writers = 0;
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105 rwlock->rw_reader_locks = 0;
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106 rwlock->rw_writer_locks = 0;
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107
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108 return rwlock;
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109
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110 loser:
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111 NSSRWLock_Destroy(rwlock);
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112 return(NULL);
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113 }
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114
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115 /*
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116 ** Destroy the given RWLock "lock".
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117 */
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118 void
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119 NSSRWLock_Destroy(NSSRWLock *rwlock)
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120 {
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121 PR_ASSERT(rwlock != NULL);
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122 PR_ASSERT(rwlock->rw_waiting_readers == 0);
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123
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124 /* XXX Shouldn't we lock the PZLock before destroying this?? */
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125
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126 if (rwlock->rw_name)
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127 PR_Free(rwlock->rw_name);
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128 if (rwlock->rw_reader_waitq)
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129 PZ_DestroyCondVar(rwlock->rw_reader_waitq);
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130 if (rwlock->rw_writer_waitq)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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parents:
diff changeset
131 PZ_DestroyCondVar(rwlock->rw_writer_waitq);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
132 if (rwlock->rw_lock)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
133 PZ_DestroyLock(rwlock->rw_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
134 PR_DELETE(rwlock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
135 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
136
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
137 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
138 ** Read-lock the RWLock.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
139 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
140 void
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
141 NSSRWLock_LockRead(NSSRWLock *rwlock)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
142 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
143 PRThread *me = PR_GetCurrentThread();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
144
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
145 PZ_Lock(rwlock->rw_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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parents:
diff changeset
146 #ifdef NSS_RWLOCK_RANK_ORDER_DEBUG
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diff changeset
147
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
148 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
149 * assert that rank ordering is not violated; the rank of 'rwlock' should
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
150 * be equal to or greater than the highest rank of all the locks held by
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
151 * the thread.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
152 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
153 PR_ASSERT((rwlock->rw_rank == NSS_RWLOCK_RANK_NONE) ||
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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154 (rwlock->rw_rank >= nssRWLock_GetThreadRank(me)));
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
155 #endif
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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156 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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157 * wait if write-locked or if a writer is waiting; preference for writers
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
158 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
159 UNTIL ( (rwlock->rw_owner == me) || /* I own it, or */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
160 ((rwlock->rw_owner == NULL) && /* no-one owns it, and */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
161 (rwlock->rw_waiting_writers == 0))) { /* no-one is waiting to own */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
162
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
163 rwlock->rw_waiting_readers++;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
164 PZ_WaitCondVar(rwlock->rw_reader_waitq, PR_INTERVAL_NO_TIMEOUT);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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165 rwlock->rw_waiting_readers--;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
166 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
167 rwlock->rw_reader_locks++; /* Increment read-lock count */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
168
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169 PZ_Unlock(rwlock->rw_lock);
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
170
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
171 #ifdef NSS_RWLOCK_RANK_ORDER_DEBUG
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172 nssRWLock_SetThreadRank(me, rwlock);/* update thread's lock rank */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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173 #endif
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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174 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
175
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
176 /* Unlock a Read lock held on this RW lock.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
177 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
178 void
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
179 NSSRWLock_UnlockRead(NSSRWLock *rwlock)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
180 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
181 PZ_Lock(rwlock->rw_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
182
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
183 PR_ASSERT(rwlock->rw_reader_locks > 0); /* lock must be read locked */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
184
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
185 if (( rwlock->rw_reader_locks > 0) && /* caller isn't screwey */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
186 (--rwlock->rw_reader_locks == 0) && /* not read locked any more */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
187 ( rwlock->rw_owner == NULL) && /* not write locked */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
188 ( rwlock->rw_waiting_writers > 0)) { /* someone's waiting. */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
189
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
190 PZ_NotifyCondVar(rwlock->rw_writer_waitq); /* wake him up. */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
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191 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
192
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Andre Heinecke <andre.heinecke@intevation.de>
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193 PZ_Unlock(rwlock->rw_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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194
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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195 #ifdef NSS_RWLOCK_RANK_ORDER_DEBUG
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196 /*
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197 * update thread's lock rank
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198 */
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
199 nssRWLock_UnsetThreadRank(me, rwlock);
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200 #endif
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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201 return;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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202 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
203
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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204 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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205 ** Write-lock the RWLock.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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206 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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207 void
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
208 NSSRWLock_LockWrite(NSSRWLock *rwlock)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
209 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
210 PRThread *me = PR_GetCurrentThread();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
211
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212 PZ_Lock(rwlock->rw_lock);
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213 #ifdef NSS_RWLOCK_RANK_ORDER_DEBUG
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214 /*
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215 * assert that rank ordering is not violated; the rank of 'rwlock' should
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
216 * be equal to or greater than the highest rank of all the locks held by
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
217 * the thread.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
218 */
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
219 PR_ASSERT((rwlock->rw_rank == NSS_RWLOCK_RANK_NONE) ||
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
220 (rwlock->rw_rank >= nssRWLock_GetThreadRank(me)));
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
221 #endif
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
222 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
223 * wait if read locked or write locked.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
224 */
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225 PR_ASSERT(rwlock->rw_reader_locks >= 0);
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diff changeset
226 PR_ASSERT(me != NULL);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
227
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
228 UNTIL ( (rwlock->rw_owner == me) || /* I own write lock, or */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
229 ((rwlock->rw_owner == NULL) && /* no writer and */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
230 (rwlock->rw_reader_locks == 0))) { /* no readers, either. */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
231
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232 rwlock->rw_waiting_writers++;
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
233 PZ_WaitCondVar(rwlock->rw_writer_waitq, PR_INTERVAL_NO_TIMEOUT);
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
234 rwlock->rw_waiting_writers--;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
235 PR_ASSERT(rwlock->rw_reader_locks >= 0);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
236 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
237
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diff changeset
238 PR_ASSERT(rwlock->rw_reader_locks == 0);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
239 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
240 * apply write lock
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
241 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
242 rwlock->rw_owner = me;
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
243 rwlock->rw_writer_locks++; /* Increment write-lock count */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
244
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
245 PZ_Unlock(rwlock->rw_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
246
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
247 #ifdef NSS_RWLOCK_RANK_ORDER_DEBUG
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
248 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
249 * update thread's lock rank
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
250 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
251 nssRWLock_SetThreadRank(me,rwlock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
252 #endif
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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parents:
diff changeset
253 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
254
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
255 /* Unlock a Read lock held on this RW lock.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
256 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
257 void
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
258 NSSRWLock_UnlockWrite(NSSRWLock *rwlock)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
259 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
260 PRThread *me = PR_GetCurrentThread();
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
261
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
262 PZ_Lock(rwlock->rw_lock);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
263 PR_ASSERT(rwlock->rw_owner == me); /* lock must be write-locked by me. */
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264 PR_ASSERT(rwlock->rw_writer_locks > 0); /* lock must be write locked */
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parents:
diff changeset
265
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
266 if ( rwlock->rw_owner == me && /* I own it, and */
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parents:
diff changeset
267 rwlock->rw_writer_locks > 0 && /* I own it, and */
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parents:
diff changeset
268 --rwlock->rw_writer_locks == 0) { /* I'm all done with it */
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parents:
diff changeset
269
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diff changeset
270 rwlock->rw_owner = NULL; /* I don't own it any more. */
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parents:
diff changeset
271
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parents:
diff changeset
272 /* Give preference to waiting writers. */
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diff changeset
273 if (rwlock->rw_waiting_writers > 0) {
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
274 if (rwlock->rw_reader_locks == 0)
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275 PZ_NotifyCondVar(rwlock->rw_writer_waitq);
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diff changeset
276 } else if (rwlock->rw_waiting_readers > 0) {
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parents:
diff changeset
277 PZ_NotifyAllCondVar(rwlock->rw_reader_waitq);
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diff changeset
278 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
279 }
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280 PZ_Unlock(rwlock->rw_lock);
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diff changeset
281
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282 #ifdef NSS_RWLOCK_RANK_ORDER_DEBUG
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283 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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284 * update thread's lock rank
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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285 */
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286 nssRWLock_UnsetThreadRank(me, rwlock);
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287 #endif
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288 return;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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289 }
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290
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291 /* This is primarily for debugging, i.e. for inclusion in ASSERT calls. */
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Andre Heinecke <andre.heinecke@intevation.de>
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292 PRBool
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293 NSSRWLock_HaveWriteLock(NSSRWLock *rwlock) {
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294 PRBool ownWriteLock;
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295 PRThread *me = PR_GetCurrentThread();
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
296
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297 /* This lock call isn't really necessary.
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298 ** If this thread is the owner, that fact cannot change during this call,
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Andre Heinecke <andre.heinecke@intevation.de>
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299 ** because this thread is in this call.
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300 ** If this thread is NOT the owner, the owner could change, but it
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
301 ** could not become this thread.
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Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
302 */
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Andre Heinecke <andre.heinecke@intevation.de>
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303 #if UNNECESSARY
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
304 PZ_Lock(rwlock->rw_lock);
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305 #endif
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diff changeset
306 ownWriteLock = (PRBool)(me == rwlock->rw_owner);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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307 #if UNNECESSARY
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
308 PZ_Unlock(rwlock->rw_lock);
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diff changeset
309 #endif
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
310 return ownWriteLock;
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311 }
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312
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313 #ifdef NSS_RWLOCK_RANK_ORDER_DEBUG
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314
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Andre Heinecke <andre.heinecke@intevation.de>
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315 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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316 * nssRWLock_SetThreadRank
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
317 * Set a thread's lock rank, which is the highest of the ranks of all
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
318 * the locks held by the thread. Pointers to the locks are added to a
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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parents:
diff changeset
319 * per-thread list, which is anchored off a thread-private data key.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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parents:
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320 */
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321
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diff changeset
322 static void
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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323 nssRWLock_SetThreadRank(PRThread *me, NSSRWLock *rwlock)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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324 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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325 thread_rwlock_stack *lock_stack;
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Andre Heinecke <andre.heinecke@intevation.de>
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326 PRStatus rv;
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
327
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328 /*
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329 * allocated thread-private-data for rwlock list, if not already allocated
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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330 */
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331 if (!nss_thread_rwlock_initialized) {
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332 /*
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Andre Heinecke <andre.heinecke@intevation.de>
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333 * allocate tpd, only if not failed already
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
334 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
335 if (!nss_thread_rwlock_alloc_failed) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
336 if (PR_NewThreadPrivateIndex(&nss_thread_rwlock,
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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337 nssRWLock_ReleaseLockStack)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
338 == PR_FAILURE) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
339 nss_thread_rwlock_alloc_failed = 1;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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340 return;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
341 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
342 } else
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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343 return;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
344 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
345 /*
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Andre Heinecke <andre.heinecke@intevation.de>
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346 * allocate a lock stack
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Andre Heinecke <andre.heinecke@intevation.de>
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347 */
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348 if ((lock_stack = PR_GetThreadPrivate(nss_thread_rwlock)) == NULL) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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349 lock_stack = (thread_rwlock_stack *)
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350 PR_CALLOC(1 * sizeof(thread_rwlock_stack));
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351 if (lock_stack) {
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352 rv = PR_SetThreadPrivate(nss_thread_rwlock, lock_stack);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
353 if (rv == PR_FAILURE) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
354 PR_DELETE(lock_stack);
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diff changeset
355 nss_thread_rwlock_alloc_failed = 1;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
356 return;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
357 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
358 } else {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
359 nss_thread_rwlock_alloc_failed = 1;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
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diff changeset
360 return;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
361 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
362 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
363 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
364 * add rwlock to lock stack, if limit is not exceeded
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
365 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
366 if (lock_stack) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
367 if (lock_stack->trs_index < _NSS_RWLOCK_RANK_ORDER_LIMIT)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
368 lock_stack->trs_stack[lock_stack->trs_index++] = rwlock;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
369 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
370 nss_thread_rwlock_initialized = 1;
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Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
371 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
372
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
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diff changeset
373 static void
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
374 nssRWLock_ReleaseLockStack(void *lock_stack)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
375 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
376 PR_ASSERT(lock_stack);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
377 PR_DELETE(lock_stack);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
378 }
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
379
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
380 /*
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
381 * nssRWLock_GetThreadRank
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
382 *
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
383 * return thread's lock rank. If thread-private-data for the lock
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
384 * stack is not allocated, return NSS_RWLOCK_RANK_NONE.
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
385 */
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
386
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
387 static PRUint32
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
388 nssRWLock_GetThreadRank(PRThread *me)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
389 {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
390 thread_rwlock_stack *lock_stack;
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
391
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
392 if (nss_thread_rwlock_initialized) {
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
393 if ((lock_stack = PR_GetThreadPrivate(nss_thread_rwlock)) == NULL)
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
394 return (NSS_RWLOCK_RANK_NONE);
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
395 else
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
396 return(lock_stack->trs_stack[lock_stack->trs_index - 1]->rw_rank);
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397
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398 } else
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399 return (NSS_RWLOCK_RANK_NONE);
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400 }
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401
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402 /*
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403 * nssRWLock_UnsetThreadRank
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404 *
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405 * remove the rwlock from the lock stack. Since locks may not be
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406 * unlocked in a FIFO order, the entire lock stack is searched.
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407 */
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408
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409 static void
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410 nssRWLock_UnsetThreadRank(PRThread *me, NSSRWLock *rwlock)
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411 {
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412 thread_rwlock_stack *lock_stack;
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413 int new_index = 0, index, done = 0;
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414
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415 if (!nss_thread_rwlock_initialized)
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416 return;
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417
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418 lock_stack = PR_GetThreadPrivate(nss_thread_rwlock);
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419
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420 PR_ASSERT(lock_stack != NULL);
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421
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422 index = lock_stack->trs_index - 1;
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423 while (index-- >= 0) {
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424 if ((lock_stack->trs_stack[index] == rwlock) && !done) {
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425 /*
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426 * reset the slot for rwlock
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427 */
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428 lock_stack->trs_stack[index] = NULL;
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429 done = 1;
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430 }
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431 /*
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432 * search for the lowest-numbered empty slot, above which there are
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433 * no non-empty slots
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434 */
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435 if ((lock_stack->trs_stack[index] != NULL) && !new_index)
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436 new_index = index + 1;
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437 if (done && new_index)
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438 break;
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439 }
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440 /*
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Andre Heinecke <andre.heinecke@intevation.de>
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441 * set top of stack to highest numbered empty slot
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442 */
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443 lock_stack->trs_index = new_index;
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444
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445 }
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446
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447 #endif /* NSS_RWLOCK_RANK_ORDER_DEBUG */
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