Libc-498.tar.gz

[apple/libc.git] / darwin / MKGetTimeBaseInfo.c

diff --git a/darwin/MKGetTimeBaseInfo.c b/darwin/MKGetTimeBaseInfo.c
new file mode 100644 (file)
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+++ b/darwin/MKGetTimeBaseInfo.c
@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2007 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#include <mach/kern_return.h>
+#include <mach/mach_time.h>
+#include <stdint.h>
+
+extern void spin_lock(int *);
+extern void spin_unlock(int *);
+
+/* deprecated function stub */
+kern_return_t
+MKGetTimeBaseInfo(
+    uint32_t *minAbsoluteTimeDelta,
+    uint32_t *theAbsoluteTimeToNanosecondNumerator,
+    uint32_t *theAbsoluteTimeToNanosecondDenominator,
+    uint32_t *theProcessorToAbsoluteTimeNumerator,
+    uint32_t *theProcessorToAbsoluteTimeDenominator
+) {
+    static struct mach_timebase_info mti = {0};
+    static int MKGetTimeBaseInfo_spin_lock = 0;
+
+    if(mti.numer == 0) {
+       kern_return_t err;
+       spin_lock(&MKGetTimeBaseInfo_spin_lock);
+       err = mach_timebase_info(&mti);
+       spin_unlock(&MKGetTimeBaseInfo_spin_lock);
+       if(err != KERN_SUCCESS)
+           return err;
+    }
+    if(theAbsoluteTimeToNanosecondNumerator)
+       *theAbsoluteTimeToNanosecondNumerator = mti.numer;
+    if(theAbsoluteTimeToNanosecondDenominator)
+       *theAbsoluteTimeToNanosecondDenominator = mti.denom;
+    if(minAbsoluteTimeDelta)
+       *minAbsoluteTimeDelta = 1;
+    if(theProcessorToAbsoluteTimeNumerator)
+       *theProcessorToAbsoluteTimeNumerator = 1;
+    if(theProcessorToAbsoluteTimeDenominator)
+       *theProcessorToAbsoluteTimeDenominator = 1;
+    return KERN_SUCCESS;
+}