1 files changed, 109 insertions, 0 deletions
diff --git a/nsprpub/pr/include/prlock.h b/nsprpub/pr/include/prlock.h
new file mode 100644
index 0000000000..9b7fdaa184
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+++ b/nsprpub/pr/include/prlock.h
@@ -0,0 +1,109 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+/*
+** File:        prlock.h
+** Description: API to basic locking functions of NSPR.
+**
+**
+** NSPR provides basic locking mechanisms for thread synchronization.  Locks
+** are lightweight resource contention controls that prevent multiple threads
+** from accessing something (code/data) simultaneously.
+**/
+
+#ifndef prlock_h___
+#define prlock_h___
+
+#include "prtypes.h"
+
+PR_BEGIN_EXTERN_C
+
+/**********************************************************************/
+/************************* TYPES AND CONSTANTS ************************/
+/**********************************************************************/
+
+/*
+ * PRLock --
+ *
+ *     NSPR represents the lock as an opaque entity to the client of the
+ *     API.  All routines operate on a pointer to this opaque entity.
+ */
+
+typedef struct PRLock PRLock;
+
+/**********************************************************************/
+/****************************** FUNCTIONS *****************************/
+/**********************************************************************/
+
+/***********************************************************************
+** FUNCTION:    PR_NewLock
+** DESCRIPTION:
+**  Returns a pointer to a newly created opaque lock object.
+** INPUTS:      void
+** OUTPUTS:     void
+** RETURN:      PRLock*
+**   If the lock can not be created because of resource constraints, NULL
+**   is returned.
+**
+***********************************************************************/
+NSPR_API(PRLock*) PR_NewLock(void);
+
+/***********************************************************************
+** FUNCTION:    PR_DestroyLock
+** DESCRIPTION:
+**  Destroys a given opaque lock object.
+** INPUTS:      PRLock *lock
+**              Lock to be freed.
+** OUTPUTS:     void
+** RETURN:      None
+***********************************************************************/
+NSPR_API(void) PR_DestroyLock(PRLock *lock);
+
+/***********************************************************************
+** FUNCTION:    PR_Lock
+** DESCRIPTION:
+**  Lock a lock.
+** INPUTS:      PRLock *lock
+**              Lock to locked.
+** OUTPUTS:     void
+** RETURN:      None
+***********************************************************************/
+NSPR_API(void) PR_Lock(PRLock *lock);
+
+/***********************************************************************
+** FUNCTION:    PR_Unlock
+** DESCRIPTION:
+**  Unlock a lock.  Unlocking an unlocked lock has undefined results.
+** INPUTS:      PRLock *lock
+**              Lock to unlocked.
+** OUTPUTS:     void
+** RETURN:      PR_STATUS
+**              Returns PR_FAILURE if the caller does not own the lock.
+***********************************************************************/
+NSPR_API(PRStatus) PR_Unlock(PRLock *lock);
+
+/***********************************************************************
+** MACRO:    PR_ASSERT_CURRENT_THREAD_OWNS_LOCK
+** DESCRIPTION:
+**  If the current thread owns |lock|, this assertion is guaranteed to
+**  succeed.  Otherwise, the behavior of this function is undefined.
+** INPUTS:      PRLock *lock
+**              Lock to assert ownership of.
+** OUTPUTS:     void
+** RETURN:      None
+***********************************************************************/
+#if defined(DEBUG) || defined(FORCE_PR_ASSERT)
+#define PR_ASSERT_CURRENT_THREAD_OWNS_LOCK(/* PrLock* */ lock) \
+    PR_AssertCurrentThreadOwnsLock(lock)
+#else
+#define PR_ASSERT_CURRENT_THREAD_OWNS_LOCK(/* PrLock* */ lock)
+#endif
+
+/* Don't call this function directly. */
+NSPR_API(void) PR_AssertCurrentThreadOwnsLock(PRLock *lock);
+
+PR_END_EXTERN_C
+
+#endif /* prlock_h___ */