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-rw-r--r--nsprpub/pr/src/md/os2/os2inrval.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/nsprpub/pr/src/md/os2/os2inrval.c b/nsprpub/pr/src/md/os2/os2inrval.c
new file mode 100644
index 000000000..aff99e2ec
--- /dev/null
+++ b/nsprpub/pr/src/md/os2/os2inrval.c
@@ -0,0 +1,80 @@
+/* -*- 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/. */
+
+/*
+ * OS/2 interval timers
+ *
+ */
+
+#include "primpl.h"
+
+static PRBool useHighResTimer = PR_FALSE;
+PRIntervalTime _os2_ticksPerSec = -1;
+PRIntn _os2_bitShift = 0;
+PRInt32 _os2_highMask = 0;
+
+void
+_PR_MD_INTERVAL_INIT()
+{
+ 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);
+ while (timerFreq > PR_INTERVAL_MAX) {
+ timerFreq >>= 1;
+ _os2_bitShift++;
+ _os2_highMask = (_os2_highMask << 1)+1;
+ }
+
+ _os2_ticksPerSec = timerFreq;
+ PR_ASSERT(_os2_ticksPerSec > PR_INTERVAL_MIN);
+ }
+}
+
+PRIntervalTime
+_PR_MD_GET_INTERVAL()
+{
+ if (useHighResTimer) {
+ QWORD timestamp;
+ PRInt32 top;
+ APIRET rc = DosTmrQueryTime(&timestamp);
+ if (NO_ERROR != rc) {
+ return -1;
+ }
+ /* Sadly, nspr requires the interval to range from 1000 ticks per
+ * second to only 100000 ticks per second. DosTmrQueryTime is too
+ * high resolution...
+ */
+ top = timestamp.ulHi & _os2_highMask;
+ top = top << (32 - _os2_bitShift);
+ timestamp.ulLo = timestamp.ulLo >> _os2_bitShift;
+ timestamp.ulLo = timestamp.ulLo + top;
+ return (PRUint32)timestamp.ulLo;
+ } else {
+ ULONG msCount = -1;
+ DosQuerySysInfo(QSV_MS_COUNT, QSV_MS_COUNT, &msCount, sizeof(msCount));
+ return msCount;
+ }
+}
+
+PRIntervalTime
+_PR_MD_INTERVAL_PER_SEC()
+{
+ if (useHighResTimer) {
+ return _os2_ticksPerSec;
+ } else {
+ return 1000;
+ }
+}