Changeset 25616 in vbox for trunk/src/VBox/Runtime

Timestamp:

Jan 2, 2010 12:13:19 AM (15 years ago)

Author:

vboxsync

Message:

iprt/semrw-*: Added RTSemRWGetReadCount. Adjusted writer fairness a little bit in semrw-generic.cpp.

Location:

trunk/src/VBox/Runtime

Files:

• generic/semrw-generic.cpp (modified) (2 diffs)
• r3/posix/semrw-posix.cpp (modified) (1 diff)

trunk/src/VBox/Runtime/generic/semrw-generic.cpp

@@ -513 +513 @@
      */
     RTNATIVETHREAD hNativeSelf = pThis->CritSect.NativeThreadOwner;
-    if (!pThis->cReads && (!pThis->cWrites || pThis->hWriter == hNativeSelf))
+    if (    !pThis->cReads
+        &&  (   (   !pThis->cWrites
+                 && (   !pThis->cWritesWaiting /* play fair if we can wait */
+                     || !cMillies)
+                )
+             || pThis->hWriter == hNativeSelf
+            )
+       )
     {
         /*
@@ -785 +792 @@
 }
 RT_EXPORT_SYMBOL(RTSemRWGetWriterReadRecursion);
+
+
+RTDECL(uint32_t) RTSemRWGetReadCount(RTSEMRW RWSem)
+{
+    /*
+     * Validate input.
+     */
+    struct RTSEMRWINTERNAL *pThis = RWSem;
+    AssertPtrReturn(pThis, 0);
+    AssertMsgReturn(pThis->u32Magic == RTSEMRW_MAGIC,
+                    ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic),
+                    0);
+
+    /*
+     * Return the requested data.
+     */
+    return pThis->cReads;
+}
+RT_EXPORT_SYMBOL(RTSemRWGetReadCount);
+

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

@@ -590 +590 @@
     return pThis->cWriterReads;
 }
+
+
+RTDECL(uint32_t) RTSemRWGetReadCount(RTSEMRW RWSem)
+{
+    /*
+     * Validate input.
+     */
+    struct RTSEMRWINTERNAL *pThis = RWSem;
+    AssertPtrReturn(pThis, 0);
+    AssertMsgReturn(pThis->u32Magic == RTSEMRW_MAGIC,
+                    ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic),
+                    0);
+
+    /*
+     * Return the requested data.
+     */
+    return pThis->cReaders;
+}
+