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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /security/nss/lib/pk11wrap/pk11list.c
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'security/nss/lib/pk11wrap/pk11list.c')
-rw-r--r--security/nss/lib/pk11wrap/pk11list.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/security/nss/lib/pk11wrap/pk11list.c b/security/nss/lib/pk11wrap/pk11list.c
new file mode 100644
index 000000000..aaf29f69d
--- /dev/null
+++ b/security/nss/lib/pk11wrap/pk11list.c
@@ -0,0 +1,99 @@
+/* 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/. */
+/*
+ * Locking and queue management primatives
+ *
+ */
+
+#include "seccomon.h"
+#include "nssilock.h"
+#include "secmod.h"
+#include "secmodi.h"
+#include "secmodti.h"
+#include "nssrwlk.h"
+
+/*
+ * create a new lock for a Module List
+ */
+SECMODListLock *
+SECMOD_NewListLock()
+{
+ return NSSRWLock_New(10, "moduleListLock");
+}
+
+/*
+ * destroy the lock
+ */
+void
+SECMOD_DestroyListLock(SECMODListLock *lock)
+{
+ NSSRWLock_Destroy(lock);
+}
+
+/*
+ * Lock the List for Read: NOTE: this assumes the reading isn't so common
+ * the writing will be starved.
+ */
+void
+SECMOD_GetReadLock(SECMODListLock *modLock)
+{
+ NSSRWLock_LockRead(modLock);
+}
+
+/*
+ * Release the Read lock
+ */
+void
+SECMOD_ReleaseReadLock(SECMODListLock *modLock)
+{
+ NSSRWLock_UnlockRead(modLock);
+}
+
+/*
+ * lock the list for Write
+ */
+void
+SECMOD_GetWriteLock(SECMODListLock *modLock)
+{
+ NSSRWLock_LockWrite(modLock);
+}
+
+/*
+ * Release the Write Lock: NOTE, this code is pretty inefficient if you have
+ * lots of write collisions.
+ */
+void
+SECMOD_ReleaseWriteLock(SECMODListLock *modLock)
+{
+ NSSRWLock_UnlockWrite(modLock);
+}
+
+/*
+ * must Hold the Write lock
+ */
+void
+SECMOD_RemoveList(SECMODModuleList **parent, SECMODModuleList *child)
+{
+ *parent = child->next;
+ child->next = NULL;
+}
+
+/*
+ * if lock is not specified, it must already be held
+ */
+void
+SECMOD_AddList(SECMODModuleList *parent, SECMODModuleList *child,
+ SECMODListLock *lock)
+{
+ if (lock) {
+ SECMOD_GetWriteLock(lock);
+ }
+
+ child->next = parent->next;
+ parent->next = child;
+
+ if (lock) {
+ SECMOD_ReleaseWriteLock(lock);
+ }
+}