Changeset 2048 for trunk/src/emx/include/386/builtin.h

Timestamp:

Jun 19, 2005, 6:10:41 AM (20 years ago)

Author:

bird

Message:

o File resize optimization: The JFS, HPFS and probably NET

will never return space which isn't zeroed when expanding
a file. Associate a file system information object with the
filehandles to keep track of such features. This also fixes
the fsStatFH() implementation trouble.
This attribute doesn't apply to CDFS. While RAMFS fails
the test, it zeros at open but not at setfilesize.

o Fixed invalid inode and dev numbers for new files, was passing

the wrong path around.

File:

• trunk/src/emx/include/386/builtin.h (modified) (4 diffs, 1 prop)

trunk/src/emx/include/386/builtin.h

@@ -148 +148 @@
 }
 
-
 /**
  * Atomically increments a 32-bit unsigned value.
@@ -164 +163 @@
  * Atomically increments a 32-bit unsigned value.
  *
+ * @returns The new value.
  * @param   pu32    Pointer to the value to increment.
  */
-static __inline__ void __atomic_increment_u32(uint32_t __volatile__ *pu32)
-{
-    __asm__ __volatile__("lock; incl %0"
-                         : "=m" (*pu32)
-                         : "m"  (*pu32));
+static __inline__ uint32_t __atomic_increment_u32(uint32_t __volatile__ *pu32)
+{
+    uint32_t u32;
+    __asm__ __volatile__("lock; xadd %0, %1\n\t"
+                         "incl %0\n\t"
+                         : "=r" (u32),
+                           "=m" (*pu32)
+                         : "0" (1)
+                         : "memory");
+    return u32;
+}
+
+/**
+ * Atomically increments a 32-bit signed value.
+ *
+ * @returns The new value.
+ * @param   pi32    Pointer to the value to increment.
+ */
+static __inline__ uint32_t __atomic_increment_s32(int32_t __volatile__ *pi32)
+{
+    int32_t i32;
+    __asm__ __volatile__("lock; xadd %0, %1\n\t"
+                         "incl %0\n\t"
+                         : "=r" (i32),
+                           "=m" (*pi32)
+                         : "0" (1)
+                         : "memory");
+    return i32;
 }
 
@@ -200 +223 @@
  * Atomically decrements a 32-bit unsigned value.
  *
- * @param   pu      Pointer to the value to decrement.
- */
-static __inline__ void __atomic_decrement_u32(__volatile__ uint32_t *pu32)
-{
-    __asm__ __volatile__("lock; decl %0"
-                         : "=m" (*pu32)
-                         : "m"  (*pu32));
+ * @returns The new value.
+ * @param   pu32      Pointer to the value to decrement.
+ */
+static __inline__ uint32_t __atomic_decrement_u32(__volatile__ uint32_t *pu32)
+{
+    uint32_t u32;
+    __asm__ __volatile__("lock; xadd %0, %1\n\t"
+                         "decl %0\n\t"
+                         : "=r" (u32),
+                           "=m" (*pu32)
+                         : "0" (-1)
+                         : "memory");
+    return u32;
+}
+
+/**
+ * Atomically decrements a 32-bit signed value.
+ *
+ * @returns The new value.
+ * @param   pi32    Pointer to the value to decrement.
+ */
+static __inline__ uint32_t __atomic_decrement_s32(__volatile__ int32_t *pi32)
+{
+    int32_t i32;
+    __asm__ __volatile__("lock; xadd %0, %1\n\t"
+                         "decl %0\n\t"
+                         : "=r" (i32),
+                           "=m" (*pi32)
+                         : "0" (-1)
+                         : "memory");
+    return i32;
 }
 
@@ -212 +259 @@
  * Atomically decrements a 16-bit unsigned value.
  *
+ * @returns The new value.
  * @param   pu16    Pointer to the value to decrement.
  */