Changeset 25908 in vbox for trunk/src/VBox/Runtime/r3

Timestamp:

Jan 18, 2010 10:07:28 PM (15 years ago)

Author:

vboxsync

svn:sync-xref-src-repo-rev:

56726

Message:

RTSemRWIsReadOwner: For assertion in main.

File:

• trunk/src/VBox/Runtime/r3/posix/semrw-posix.cpp (modified) (1 diff)

trunk/src/VBox/Runtime/r3/posix/semrw-posix.cpp

@@ -638 +638 @@
 
 
+RTDECL(bool)  RTSemRWIsReadOwner(RTSEMRW hRWSem, bool fWannaHear)
+{
+    /*
+     * Validate handle.
+     */
+    struct RTSEMRWINTERNAL *pThis = hRWSem;
+    AssertPtrReturn(pThis, false);
+    AssertReturn(pThis->u32Magic == RTSEMRW_MAGIC, false);
+
+    /*
+     * Check write ownership.  The writer is also a valid reader.
+     */
+    pthread_t Self = pthread_self();
+    pthread_t Writer;
+    ATOMIC_GET_PTHREAD_T(&pThis->Writer, &Writer);
+    if (Writer == Self)
+        return true;
+    if (Writer != (pthread_t)-1)
+        return false;
+
+    /*
+     * If there are no readers, we cannot be one of them, can we?
+     */
+    if (ASMAtomicReadU32(&pThis->cReaders) == 0)
+        return false;
+
+#ifdef RTSEMRW_STRICT
+    /*
+     * Ask the lock validator.
+     */
+    return RTLockValidatorRecSharedIsOwner(&pThis->ValidatorRead, NIL_RTTHREAD);
+#else
+    /*
+     * Just tell the caller what he want to hear.
+     */
+    return fWannaHear;
+#endif
+}
+RT_EXPORT_SYMBOL(RTSemRWIsReadOwner);
+
+
 RTDECL(uint32_t) RTSemRWGetWriteRecursion(RTSEMRW hRWSem)
 {