Fix bug 106999 -- implement Mac atomic operations using Open Transport routines for speed. r=wtc.

nsprpub/pr/include/md/_macos.h

@@ -44,6 +44,7 @@
 #define PR_DLL_SUFFIX		""
 #define _PR_LOCAL_THREADS_ONLY
 #define _PR_NO_PREEMPT	1
+#define _PR_HAVE_ATOMIC_OPS 1
 
 #include "prinit.h"
 #include "prio.h"
@@ -61,7 +62,9 @@
 
 #include <stddef.h>
 #include <setjmp.h>
+
 #include <Errors.h>
+#include <OpenTransport.h>
 
 #define _PR_HAVE_PEEK_BUFFER
 #define _PR_PEEK_BUFFER_MAX (16 * 1024)
@@ -678,4 +681,20 @@ extern void LeaveCritialRegion();
 #endif
 
 
+/*
+ * Atomic operations
+ */
+#ifdef _PR_HAVE_ATOMIC_OPS
+
+extern PRInt32 _MD_AtomicSet(PRInt32 *val, PRInt32 newval);
+
+#define _MD_INIT_ATOMIC()
+#define _MD_ATOMIC_INCREMENT(val)   OTAtomicAdd32(1, (SInt32 *)val)
+#define _MD_ATOMIC_ADD(ptr, val)    OTAtomicAdd32(val, (SInt32 *)ptr)
+#define _MD_ATOMIC_DECREMENT(val)   OTAtomicAdd32(-1, (SInt32 *)val)
+#define _MD_ATOMIC_SET(val, newval) _MD_AtomicSet(val, newval)
+
+#endif /* _PR_HAVE_ATOMIC_OPS */
+
+
 #endif /* prmacos_h___ */

nsprpub/pr/src/md/mac/macthr.c

@@ -433,6 +433,26 @@ PRStatus _MD_KillProcess(PRProcess *process)
 	PR_SetError(PR_NOT_IMPLEMENTED_ERROR, unimpErr);
 	return PR_FAILURE;
 }
+
+//##############################################################################
+//##############################################################################
+#pragma mark -
+#pragma mark ATOMIC OPERATIONS
+
+#ifdef _PR_HAVE_ATOMIC_OPS
+PRInt32
+_MD_AtomicSet(PRInt32 *val, PRInt32 newval)
+{
+    PRInt32 rv;
+    do  {
+        rv = *val;
+    } while (!OTCompareAndSwap32(rv, newval, (UInt32*)val));
+
+    return rv;
+}
+
+#endif // _PR_HAVE_ATOMIC_OPS
+
 //##############################################################################
 //##############################################################################
 #pragma mark -