Update to NSPR 4.9.5 Beta 2, part 2: actual changes.

mozilla/nsprpub/pr/src/md/unix/darwin.c

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "primpl.h"
 
+#include <mach/mach_time.h>
+
 void _MD_EarlyInit(void)
 {
 }
 
+/*
+ * The multiplier (as a fraction) for converting the Mach absolute time
+ * unit to nanoseconds.
+ */
+static mach_timebase_info_data_t machTimebaseInfo;
+
+void _PR_Mach_IntervalInit(void)
+{
+    kern_return_t rv;
+
+    rv = mach_timebase_info(&machTimebaseInfo);
+    PR_ASSERT(rv == KERN_SUCCESS);
+}
+
+PRIntervalTime _PR_Mach_GetInterval(void)
+{
+    uint64_t time;
+
+    /*
+     * mach_absolute_time returns the time in the Mach absolute time unit.
+     * Convert it to milliseconds. See Mac Technical Q&A QA1398.
+     */
+    time = mach_absolute_time();
+    time = time * machTimebaseInfo.numer / machTimebaseInfo.denom /
+           PR_NSEC_PER_MSEC;
+    return (PRIntervalTime)time;
+}  /* _PR_Mach_GetInterval */
+
+PRIntervalTime _PR_Mach_TicksPerSecond(void)
+{
+    return 1000;
+}
+
 PRWord *_MD_HomeGCRegisters(PRThread *t, int isCurrent, int *np)
 {
 #if !defined(_PR_PTHREADS)
     if (isCurrent) {
         (void) setjmp(CONTEXT(t));
     }
     *np = sizeof(CONTEXT(t)) / sizeof(PRWord);
     return (PRWord *) CONTEXT(t);
 #else
         *np = 0;
@@ skipping 47 matching lines @@
     PRThreadState state,
     PRUint32 stackSize)
 {
     PR_NOT_REACHED("_MD_CREATE_THREAD should not be called for Darwin.");
         return PR_FAILURE;
 }
 #endif /* ! _PR_PTHREADS */
 
 /* darwin.c */