virFDStreamData: Turn into virObjectLockable

While this is no functional change, it makes the code look a bit
nicer. Moreover, it prepares ground for future work.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

src/util/virfdstream.c

@@ -53,6 +53,8 @@ VIR_LOG_INIT("fdstream");
 typedef struct virFDStreamData virFDStreamData;
 typedef virFDStreamData *virFDStreamDataPtr;
 struct virFDStreamData {
+    virObjectLockable parent;
+
     int fd;
     int errfd;
     virCommandPtr cmd;
@@ -77,10 +79,31 @@ struct virFDStreamData {
     virFDStreamInternalCloseCb icbCb;
     virFDStreamInternalCloseCbFreeOpaque icbFreeOpaque;
     void *icbOpaque;
-
-    virMutex lock;
 };
 
+static virClassPtr virFDStreamDataClass;
+
+static void
+virFDStreamDataDispose(void *obj)
+{
+    virFDStreamDataPtr fdst = obj;
+
+    VIR_DEBUG("obj=%p", fdst);
+}
+
+static int virFDStreamDataOnceInit(void)
+{
+    if (!(virFDStreamDataClass = virClassNew(virClassForObjectLockable(),
+                                             "virFDStreamData",
+                                             sizeof(virFDStreamData),
+                                             virFDStreamDataDispose)))
+        return -1;
+
+    return 0;
+}
+
+VIR_ONCE_GLOBAL_INIT(virFDStreamData)
+
 
 static int virFDStreamRemoveCallback(virStreamPtr stream)
 {
@@ -93,7 +116,7 @@ static int virFDStreamRemoveCallback(virStreamPtr stream)
         return -1;
     }
 
-    virMutexLock(&fdst->lock);
+    virObjectLock(fdst);
     if (fdst->watch == 0) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        "%s", _("stream does not have a callback registered"));
@@ -115,7 +138,7 @@ static int virFDStreamRemoveCallback(virStreamPtr stream)
     ret = 0;
 
  cleanup:
-    virMutexUnlock(&fdst->lock);
+    virObjectUnlock(fdst);
     return ret;
 }
 
@@ -130,7 +153,7 @@ static int virFDStreamUpdateCallback(virStreamPtr stream, int events)
         return -1;
     }
 
-    virMutexLock(&fdst->lock);
+    virObjectLock(fdst);
     if (fdst->watch == 0) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        "%s", _("stream does not have a callback registered"));
@@ -143,7 +166,7 @@ static int virFDStreamUpdateCallback(virStreamPtr stream, int events)
     ret = 0;
 
  cleanup:
-    virMutexUnlock(&fdst->lock);
+    virObjectUnlock(fdst);
     return ret;
 }
 
@@ -162,9 +185,9 @@ static void virFDStreamEvent(int watch ATTRIBUTE_UNUSED,
     if (!fdst)
         return;
 
-    virMutexLock(&fdst->lock);
+    virObjectLock(fdst);
     if (!fdst->cb) {
-        virMutexUnlock(&fdst->lock);
+        virObjectUnlock(fdst);
         return;
     }
 
@@ -172,21 +195,19 @@ static void virFDStreamEvent(int watch ATTRIBUTE_UNUSED,
     cbopaque = fdst->opaque;
     ff = fdst->ff;
     fdst->dispatching = true;
-    virMutexUnlock(&fdst->lock);
+    virObjectUnlock(fdst);
 
     cb(stream, events, cbopaque);
 
-    virMutexLock(&fdst->lock);
+    virObjectLock(fdst);
     fdst->dispatching = false;
     if (fdst->cbRemoved && ff)
         (ff)(cbopaque);
     closed = fdst->closed;
-    virMutexUnlock(&fdst->lock);
+    virObjectUnlock(fdst);
 
-    if (closed) {
-        virMutexDestroy(&fdst->lock);
-        VIR_FREE(fdst);
-    }
+    if (closed)
+        virObjectUnref(fdst);
 }
 
 static void virFDStreamCallbackFree(void *opaque)
@@ -211,7 +232,7 @@ virFDStreamAddCallback(virStreamPtr st,
         return -1;
     }
 
-    virMutexLock(&fdst->lock);
+    virObjectLock(fdst);
     if (fdst->watch != 0) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        "%s", _("stream already has a callback registered"));
@@ -239,7 +260,7 @@ virFDStreamAddCallback(virStreamPtr st,
     ret = 0;
 
  cleanup:
-    virMutexUnlock(&fdst->lock);
+    virObjectUnlock(fdst);
     return ret;
 }
 
@@ -307,7 +328,7 @@ virFDStreamCloseInt(virStreamPtr st, bool streamAbort)
     if (!st || !(fdst = st->privateData) || fdst->abortCallbackDispatching)
         return 0;
 
-    virMutexLock(&fdst->lock);
+    virObjectLock(fdst);
 
     /* aborting the stream, ensure the callback is called if it's
      * registered for stream error event */
@@ -317,7 +338,7 @@ virFDStreamCloseInt(virStreamPtr st, bool streamAbort)
                          VIR_STREAM_EVENT_WRITABLE))) {
         /* don't enter this function accidentally from the callback again */
         if (fdst->abortCallbackCalled) {
-            virMutexUnlock(&fdst->lock);
+            virObjectUnlock(fdst);
             return 0;
         }
 
@@ -327,12 +348,12 @@ virFDStreamCloseInt(virStreamPtr st, bool streamAbort)
         /* cache the pointers */
         cb = fdst->cb;
         opaque = fdst->opaque;
-        virMutexUnlock(&fdst->lock);
+        virObjectUnlock(fdst);
 
         /* call failure callback, poll reports nothing on closed fd */
         (cb)(st, VIR_STREAM_EVENT_ERROR, opaque);
 
-        virMutexLock(&fdst->lock);
+        virObjectLock(fdst);
         fdst->abortCallbackDispatching = false;
     }
 
@@ -356,11 +377,10 @@ virFDStreamCloseInt(virStreamPtr st, bool streamAbort)
 
     if (fdst->dispatching) {
         fdst->closed = true;
-        virMutexUnlock(&fdst->lock);
+        virObjectUnlock(fdst);
     } else {
-        virMutexUnlock(&fdst->lock);
-        virMutexDestroy(&fdst->lock);
-        VIR_FREE(fdst);
+        virObjectUnlock(fdst);
+        virObjectUnref(fdst);
     }
 
     return ret;
@@ -395,13 +415,13 @@ static int virFDStreamWrite(virStreamPtr st, const char *bytes, size_t nbytes)
         return -1;
     }
 
-    virMutexLock(&fdst->lock);
+    virObjectLock(fdst);
 
     if (fdst->length) {
         if (fdst->length == fdst->offset) {
             virReportSystemError(ENOSPC, "%s",
                                  _("cannot write to stream"));
-            virMutexUnlock(&fdst->lock);
+            virObjectUnlock(fdst);
             return -1;
         }
 
@@ -427,7 +447,7 @@ static int virFDStreamWrite(virStreamPtr st, const char *bytes, size_t nbytes)
         fdst->offset += ret;
     }
 
-    virMutexUnlock(&fdst->lock);
+    virObjectUnlock(fdst);
     return ret;
 }
 
@@ -449,11 +469,11 @@ static int virFDStreamRead(virStreamPtr st, char *bytes, size_t nbytes)
         return -1;
     }
 
-    virMutexLock(&fdst->lock);
+    virObjectLock(fdst);
 
     if (fdst->length) {
         if (fdst->length == fdst->offset) {
-            virMutexUnlock(&fdst->lock);
+            virObjectUnlock(fdst);
             return 0;
         }
 
@@ -479,7 +499,7 @@ static int virFDStreamRead(virStreamPtr st, char *bytes, size_t nbytes)
         fdst->offset += ret;
     }
 
-    virMutexUnlock(&fdst->lock);
+    virObjectUnlock(fdst);
     return ret;
 }
 
@@ -505,25 +525,22 @@ static int virFDStreamOpenInternal(virStreamPtr st,
     VIR_DEBUG("st=%p fd=%d cmd=%p errfd=%d length=%llu",
               st, fd, cmd, errfd, length);
 
+    if (virFDStreamDataInitialize() < 0)
+        return -1;
+
     if ((st->flags & VIR_STREAM_NONBLOCK) &&
         virSetNonBlock(fd) < 0) {
         virReportSystemError(errno, "%s", _("Unable to set non-blocking mode"));
         return -1;
     }
 
-    if (VIR_ALLOC(fdst) < 0)
+    if (!(fdst = virObjectLockableNew(virFDStreamDataClass)))
         return -1;
 
     fdst->fd = fd;
     fdst->cmd = cmd;
     fdst->errfd = errfd;
     fdst->length = length;
-    if (virMutexInit(&fdst->lock) < 0) {
-        VIR_FREE(fdst);
-        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                       _("Unable to initialize mutex"));
-        return -1;
-    }
 
     st->driver = &virFDStreamDrv;
     st->privateData = fdst;
@@ -821,7 +838,7 @@ int virFDStreamSetInternalCloseCb(virStreamPtr st,
 {
     virFDStreamDataPtr fdst = st->privateData;
 
-    virMutexLock(&fdst->lock);
+    virObjectLock(fdst);
 
     if (fdst->icbFreeOpaque)
         (fdst->icbFreeOpaque)(fdst->icbOpaque);
@@ -830,6 +847,6 @@ int virFDStreamSetInternalCloseCb(virStreamPtr st,
     fdst->icbOpaque = opaque;
     fdst->icbFreeOpaque = fcb;
 
-    virMutexUnlock(&fdst->lock);
+    virObjectUnlock(fdst);
     return 0;
 }