From 9a39af7303a1ec52e1d23df46a3cd42a691141eb Mon Sep 17 00:00:00 2001
From: "wtchang%redhat.com" <wtchang%redhat.com>
Date: Tue, 25 Jan 2005 22:24:12 +0000
Subject: [PATCH] Bugzilla Bug 277514: added an environment variable
 NSPR_OS2_NO_HIRES_TIMER that a user can set to disable the use of
 high-resolution timer DosTmrQueryTime().  The patch is contributed by Michael
 Kaply <mkaply@us.ibm.com>. r=wtc.

---
 nsprpub/pr/src/md/os2/os2inrval.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/nsprpub/pr/src/md/os2/os2inrval.c b/nsprpub/pr/src/md/os2/os2inrval.c
index aa928ed369d7..4006f5f2b0aa 100644
--- a/nsprpub/pr/src/md/os2/os2inrval.c
+++ b/nsprpub/pr/src/md/os2/os2inrval.c
@@ -50,8 +50,17 @@ PRInt32 _os2_highMask = 0;
 void
 _PR_MD_INTERVAL_INIT()
 {
-    ULONG timerFreq = 0; /* OS/2 high-resolution timer frequency in Hz */
-    APIRET rc = DosTmrQueryFreq(&timerFreq);
+    char *envp;
+    ULONG timerFreq;
+    APIRET rc;
+
+    if ((envp = getenv("NSPR_OS2_NO_HIRES_TIMER")) != NULL) {
+        if (atoi(envp) == 1)
+           return;
+    }
+
+    timerFreq = 0; /* OS/2 high-resolution timer frequency in Hz */
+    rc = DosTmrQueryFreq(&timerFreq);
     if (NO_ERROR == rc) {
         useHighResTimer = PR_TRUE;
         PR_ASSERT(timerFreq != 0);