--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nss/lib/ckfw/mutex.c	Mon Jul 28 10:47:06 2014 +0200
@@ -0,0 +1,269 @@
+/* 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/. */
+
+/*
+ * mutex.c
+ *
+ * This file implements a mutual-exclusion locking facility for Modules
+ * using the NSS Cryptoki Framework.
+ */
+
+#ifndef CK_T
+#include "ck.h"
+#endif /* CK_T */
+
+/*
+ * NSSCKFWMutex
+ *
+ *  NSSCKFWMutex_Destroy
+ *  NSSCKFWMutex_Lock
+ *  NSSCKFWMutex_Unlock
+ *
+ *  nssCKFWMutex_Create
+ *  nssCKFWMutex_Destroy
+ *  nssCKFWMutex_Lock
+ *  nssCKFWMutex_Unlock
+ *
+ *  -- debugging versions only --
+ *  nssCKFWMutex_verifyPointer
+ *
+ */
+
+struct NSSCKFWMutexStr {
+  PRLock *lock;
+};
+
+#ifdef DEBUG
+/*
+ * But first, the pointer-tracking stuff.
+ *
+ * NOTE: the pointer-tracking support in NSS/base currently relies
+ * upon NSPR's CallOnce support.  That, however, relies upon NSPR's
+ * locking, which is tied into the runtime.  We need a pointer-tracker
+ * implementation that uses the locks supplied through C_Initialize.
+ * That support, however, can be filled in later.  So for now, I'll
+ * just do this routines as no-ops.
+ */
+
+static CK_RV
+mutex_add_pointer
+(
+  const NSSCKFWMutex *fwMutex
+)
+{
+  return CKR_OK;
+}
+
+static CK_RV
+mutex_remove_pointer
+(
+  const NSSCKFWMutex *fwMutex
+)
+{
+  return CKR_OK;
+}
+
+NSS_IMPLEMENT CK_RV
+nssCKFWMutex_verifyPointer
+(
+  const NSSCKFWMutex *fwMutex
+)
+{
+  return CKR_OK;
+}
+
+#endif /* DEBUG */
+
+/*
+ * nssCKFWMutex_Create
+ *
+ */
+NSS_EXTERN NSSCKFWMutex *
+nssCKFWMutex_Create
+(
+  CK_C_INITIALIZE_ARGS_PTR pInitArgs,
+  CryptokiLockingState LockingState,
+  NSSArena *arena,
+  CK_RV *pError
+)
+{
+  NSSCKFWMutex *mutex;
+  
+  mutex = nss_ZNEW(arena, NSSCKFWMutex);
+  if (!mutex) {
+    *pError = CKR_HOST_MEMORY;
+    return (NSSCKFWMutex *)NULL;
+  }
+  *pError = CKR_OK;
+  mutex->lock = NULL;
+  if (LockingState == MultiThreaded) {
+    mutex->lock = PR_NewLock();
+    if (!mutex->lock) {
+      *pError = CKR_HOST_MEMORY; /* we couldn't get the resource */
+    }
+  }
+    
+  if( CKR_OK != *pError ) {
+    (void)nss_ZFreeIf(mutex);
+    return (NSSCKFWMutex *)NULL;
+  }
+
+#ifdef DEBUG
+  *pError = mutex_add_pointer(mutex);
+  if( CKR_OK != *pError ) {
+    if (mutex->lock) {
+      PR_DestroyLock(mutex->lock);
+    }
+    (void)nss_ZFreeIf(mutex);
+    return (NSSCKFWMutex *)NULL;
+  }
+#endif /* DEBUG */
+
+  return mutex;
+}  
+
+/*
+ * nssCKFWMutex_Destroy
+ *
+ */
+NSS_EXTERN CK_RV
+nssCKFWMutex_Destroy
+(
+  NSSCKFWMutex *mutex
+)
+{
+  CK_RV rv = CKR_OK;
+
+#ifdef NSSDEBUG
+  rv = nssCKFWMutex_verifyPointer(mutex);
+  if( CKR_OK != rv ) {
+    return rv;
+  }
+#endif /* NSSDEBUG */
+ 
+  if (mutex->lock) {
+    PR_DestroyLock(mutex->lock);
+  } 
+
+#ifdef DEBUG
+  (void)mutex_remove_pointer(mutex);
+#endif /* DEBUG */
+
+  (void)nss_ZFreeIf(mutex);
+  return rv;
+}
+
+/*
+ * nssCKFWMutex_Lock
+ *
+ */
+NSS_EXTERN CK_RV
+nssCKFWMutex_Lock
+(
+  NSSCKFWMutex *mutex
+)
+{
+#ifdef NSSDEBUG
+  CK_RV rv = nssCKFWMutex_verifyPointer(mutex);
+  if( CKR_OK != rv ) {
+    return rv;
+  }
+#endif /* NSSDEBUG */
+  if (mutex->lock) {
+    PR_Lock(mutex->lock);
+  }
+  
+  return CKR_OK;
+}
+
+/*
+ * nssCKFWMutex_Unlock
+ *
+ */
+NSS_EXTERN CK_RV
+nssCKFWMutex_Unlock
+(
+  NSSCKFWMutex *mutex
+)
+{
+  PRStatus nrv;
+#ifdef NSSDEBUG
+  CK_RV rv = nssCKFWMutex_verifyPointer(mutex);
+
+  if( CKR_OK != rv ) {
+    return rv;
+  }
+#endif /* NSSDEBUG */
+
+  if (!mutex->lock) 
+    return CKR_OK;
+
+  nrv =  PR_Unlock(mutex->lock);
+
+  /* if unlock fails, either we have a programming error, or we have
+   * some sort of hardware failure... in either case return CKR_DEVICE_ERROR.
+   */
+  return nrv == PR_SUCCESS ? CKR_OK : CKR_DEVICE_ERROR;
+}
+
+/*
+ * NSSCKFWMutex_Destroy
+ *
+ */
+NSS_EXTERN CK_RV
+NSSCKFWMutex_Destroy
+(
+  NSSCKFWMutex *mutex
+)
+{
+#ifdef DEBUG
+  CK_RV rv = nssCKFWMutex_verifyPointer(mutex);
+  if( CKR_OK != rv ) {
+    return rv;
+  }
+#endif /* DEBUG */
+  
+  return nssCKFWMutex_Destroy(mutex);
+}
+
+/*
+ * NSSCKFWMutex_Lock
+ *
+ */
+NSS_EXTERN CK_RV
+NSSCKFWMutex_Lock
+(
+  NSSCKFWMutex *mutex
+)
+{
+#ifdef DEBUG
+  CK_RV rv = nssCKFWMutex_verifyPointer(mutex);
+  if( CKR_OK != rv ) {
+    return rv;
+  }
+#endif /* DEBUG */
+  
+  return nssCKFWMutex_Lock(mutex);
+}
+
+/*
+ * NSSCKFWMutex_Unlock
+ *
+ */
+NSS_EXTERN CK_RV
+NSSCKFWMutex_Unlock
+(
+  NSSCKFWMutex *mutex
+)
+{
+#ifdef DEBUG
+  CK_RV rv = nssCKFWMutex_verifyPointer(mutex);
+  if( CKR_OK != rv ) {
+    return rv;
+  }
+#endif /* DEBUG */
+
+  return nssCKFWMutex_Unlock(mutex);
+}
+