--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nss/lib/libpkix/pkix_pl_nss/system/pkix_pl_rwlock.c	Mon Jul 28 10:47:06 2014 +0200
@@ -0,0 +1,217 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+/*
+ * pkix_pl_rwlock.c
+ *
+ * Read/Write Lock Functions
+ *
+ */
+
+#include "pkix_pl_rwlock.h"
+
+/* --Private-Functions-------------------------------------------- */
+
+static PKIX_Error *
+pkix_pl_RWLock_Destroy(
+        PKIX_PL_Object *object,
+        void *plContext)
+{
+        PKIX_PL_RWLock* rwlock = NULL;
+
+        PKIX_ENTER(RWLOCK, "pkix_pl_RWLock_Destroy");
+        PKIX_NULLCHECK_ONE(object);
+
+        PKIX_CHECK(pkix_CheckType(object, PKIX_RWLOCK_TYPE, plContext),
+                    PKIX_OBJECTNOTRWLOCK);
+
+        rwlock = (PKIX_PL_RWLock*) object;
+
+        PKIX_RWLOCK_DEBUG("Calling PR_DestroyRWLock)\n");
+        PR_DestroyRWLock(rwlock->lock);
+        rwlock->lock = NULL;
+
+cleanup:
+
+        PKIX_RETURN(RWLOCK);
+}
+
+/*
+ * FUNCTION: pkix_pl_RWLock_RegisterSelf
+ * DESCRIPTION:
+ *  Registers PKIX_RWLOCK_TYPE and its related functions with systemClasses[]
+ * THREAD SAFETY:
+ *  Not Thread Safe - for performance and complexity reasons
+ *
+ *  Since this function is only called by PKIX_PL_Initialize, which should
+ *  only be called once, it is acceptable that this function is not
+ *  thread-safe.
+ */
+PKIX_Error *
+pkix_pl_RWLock_RegisterSelf(
+        void *plContext)
+{
+
+        extern pkix_ClassTable_Entry systemClasses[PKIX_NUMTYPES];
+        pkix_ClassTable_Entry entry;
+
+        PKIX_ENTER(RWLOCK, "pkix_pl_RWLock_RegisterSelf");
+
+        entry.description = "RWLock";
+        entry.objCounter = 0;
+        entry.typeObjectSize = sizeof(PKIX_PL_RWLock);
+        entry.destructor = pkix_pl_RWLock_Destroy;
+        entry.equalsFunction = NULL;
+        entry.hashcodeFunction = NULL;
+        entry.toStringFunction = NULL;
+        entry.comparator = NULL;
+        entry.duplicateFunction = NULL;
+
+        systemClasses[PKIX_RWLOCK_TYPE] = entry;
+
+        PKIX_RETURN(RWLOCK);
+}
+
+/* --Public-Functions--------------------------------------------- */
+
+PKIX_Error *
+PKIX_PL_RWLock_Create(
+        PKIX_PL_RWLock **pNewLock,
+        void *plContext)
+{
+        PKIX_PL_RWLock *rwLock = NULL;
+
+        PKIX_ENTER(RWLOCK, "PKIX_PL_RWLock_Create");
+        PKIX_NULLCHECK_ONE(pNewLock);
+
+        PKIX_CHECK(PKIX_PL_Object_Alloc
+                    (PKIX_RWLOCK_TYPE,
+                    sizeof (PKIX_PL_RWLock),
+                    (PKIX_PL_Object **)&rwLock,
+                    plContext),
+                    PKIX_ERRORALLOCATINGRWLOCK);
+
+        PKIX_RWLOCK_DEBUG("\tCalling PR_NewRWLock)\n");
+        rwLock->lock = PR_NewRWLock(PR_RWLOCK_RANK_NONE, "PKIX RWLock");
+
+        if (rwLock->lock == NULL) {
+                PKIX_DECREF(rwLock);
+                PKIX_ERROR(PKIX_OUTOFMEMORY);
+        }
+
+        rwLock->readCount = 0;
+        rwLock->writeLocked = PKIX_FALSE;
+
+        *pNewLock = rwLock;
+
+cleanup:
+
+        PKIX_RETURN(RWLOCK);
+}
+
+PKIX_Error *
+PKIX_PL_AcquireReaderLock(
+        PKIX_PL_RWLock *lock,
+        void *plContext)
+{
+        PKIX_ENTER(RWLOCK, "PKIX_PL_AcquireReaderLock");
+        PKIX_NULLCHECK_ONE(lock);
+
+        PKIX_RWLOCK_DEBUG("\tCalling PR_RWLock_Rlock)\n");
+        (void) PR_RWLock_Rlock(lock->lock);
+
+        lock->readCount++;
+
+        PKIX_RETURN(RWLOCK);
+}
+
+PKIX_Error *
+PKIX_PL_ReleaseReaderLock(
+        PKIX_PL_RWLock *lock,
+        void *plContext)
+{
+        PKIX_ENTER(RWLOCK, "PKIX_PL_ReleaseReaderLock");
+        PKIX_NULLCHECK_ONE(lock);
+
+        PKIX_RWLOCK_DEBUG("\tCalling PR_RWLock_Unlock)\n");
+        (void) PR_RWLock_Unlock(lock->lock);
+
+        lock->readCount--;
+
+        PKIX_RETURN(RWLOCK);
+}
+
+PKIX_Error *
+PKIX_PL_IsReaderLockHeld(
+        PKIX_PL_RWLock *lock,
+        PKIX_Boolean *pIsHeld,
+        void *plContext)
+{
+        PKIX_ENTER(RWLOCK, "PKIX_PL_IsReaderLockHeld");
+        PKIX_NULLCHECK_TWO(lock, pIsHeld);
+
+        *pIsHeld = (lock->readCount > 0)?PKIX_TRUE:PKIX_FALSE;
+
+        PKIX_RETURN(RWLOCK);
+}
+
+PKIX_Error *
+PKIX_PL_AcquireWriterLock(
+        PKIX_PL_RWLock *lock,
+        void *plContext)
+{
+        PKIX_ENTER(RWLOCK, "PKIX_PL_AcquireWriterLock");
+        PKIX_NULLCHECK_ONE(lock);
+
+        PKIX_RWLOCK_DEBUG("\tCalling PR_RWLock_Wlock\n");
+        (void) PR_RWLock_Wlock(lock->lock);
+
+        if (lock->readCount > 0) {
+                PKIX_ERROR(PKIX_LOCKHASNONZEROREADCOUNT);
+        }
+
+        /* We should never acquire a write lock if the lock is held */
+        lock->writeLocked = PKIX_TRUE;
+
+cleanup:
+
+        PKIX_RETURN(RWLOCK);
+}
+
+PKIX_Error *
+PKIX_PL_ReleaseWriterLock(
+        PKIX_PL_RWLock *lock,
+        void *plContext)
+{
+        PKIX_ENTER(RWLOCK, "PKIX_PL_ReleaseWriterLock");
+        PKIX_NULLCHECK_ONE(lock);
+
+        if (lock->readCount > 0) {
+                PKIX_ERROR(PKIX_LOCKHASNONZEROREADCOUNT);
+        }
+
+        PKIX_RWLOCK_DEBUG("\tCalling PR_RWLock_Unlock)\n");
+        (void) PR_RWLock_Unlock(lock->lock);
+
+        /* XXX Need to think about thread safety here */
+        /* There should be a single lock holder  */
+        lock->writeLocked = PKIX_FALSE;
+
+cleanup:
+
+        PKIX_RETURN(RWLOCK);
+}
+
+PKIX_Error *
+PKIX_PL_IsWriterLockHeld(
+        PKIX_PL_RWLock *lock,
+        PKIX_Boolean *pIsHeld,
+        void *plContext)
+{
+        PKIX_ENTER(RWLOCK, "PKIX_PL_IsWriterLockHeld");
+        PKIX_NULLCHECK_TWO(lock, pIsHeld);
+
+        *pIsHeld = lock->writeLocked;
+
+        PKIX_RETURN(RWLOCK);
+}