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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is the Netscape Portable Runtime (NSPR).
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998-2000
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+/***********************************************************************
+** 1996 - Netscape Communications Corporation
+**
+** Name: cvar.c
+**
+** Description: Tests Condition Variable Operations
+**
+** Modification History:
+** 13-May-97 AGarcia- Converted the test to accomodate the debug_mode flag.
+** The debug mode will print all of the printfs associated with this test.
+** The regress mode will be the default mode. Since the regress tool limits
+** the output to a one line status:PASS or FAIL,all of the printf statements
+** have been handled with an if (debug_mode) statement.
+** 04-June-97 AGarcia removed the Test_Result function. Regress tool has been updated to
+** recognize the return code from tha main program.
+** 12-June-97 Revert to return code 0 and 1.
+***********************************************************************/
+
+/***********************************************************************
+** Includes
+***********************************************************************/
+
+#include "nspr.h"
+
+/* Used to get the command line option */
+#include "plgetopt.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+PRMonitor *mon;
+#define DEFAULT_COUNT 1000
+PRInt32 count = 0;
+PRIntn debug_mode;
+
+#define kQSIZE 1
+
+typedef struct {
+ PRLock *bufLock;
+ int startIdx;
+ int numFull;
+ PRCondVar *notFull;
+ PRCondVar *notEmpty;
+ void *data[kQSIZE];
+} CircBuf;
+
+static PRBool failed = PR_FALSE;
+
+/*
+** NewCB creates and initializes a new circular buffer.
+*/
+static CircBuf* NewCB(void)
+{
+ CircBuf *cbp;
+
+ cbp = PR_NEW(CircBuf);
+ if (cbp == NULL)
+ return (NULL);
+
+ cbp->bufLock = PR_NewLock();
+ cbp->startIdx = 0;
+ cbp->numFull = 0;
+ cbp->notFull = PR_NewCondVar(cbp->bufLock);
+ cbp->notEmpty = PR_NewCondVar(cbp->bufLock);
+
+ return (cbp);
+}
+
+/*
+** DeleteCB frees a circular buffer.
+*/
+static void DeleteCB(CircBuf *cbp)
+{
+ PR_DestroyLock(cbp->bufLock);
+ PR_DestroyCondVar(cbp->notFull);
+ PR_DestroyCondVar(cbp->notEmpty);
+ PR_DELETE(cbp);
+}
+
+
+/*
+** PutCBData puts new data on the queue. If the queue is full, it waits
+** until there is room.
+*/
+static void PutCBData(CircBuf *cbp, void *data)
+{
+ PR_Lock(cbp->bufLock);
+ /* wait while the buffer is full */
+ while (cbp->numFull == kQSIZE)
+ PR_WaitCondVar(cbp->notFull,PR_INTERVAL_NO_TIMEOUT);
+ cbp->data[(cbp->startIdx + cbp->numFull) % kQSIZE] = data;
+ cbp->numFull += 1;
+
+ /* let a waiting reader know that there is data */
+ PR_NotifyCondVar(cbp->notEmpty);
+ PR_Unlock(cbp->bufLock);
+
+}
+
+
+/*
+** GetCBData gets the oldest data on the queue. If the queue is empty, it waits
+** until new data appears.
+*/
+static void* GetCBData(CircBuf *cbp)
+{
+ void *data;
+
+ PR_Lock(cbp->bufLock);
+ /* wait while the buffer is empty */
+ while (cbp->numFull == 0)
+ PR_WaitCondVar(cbp->notEmpty,PR_INTERVAL_NO_TIMEOUT);
+ data = cbp->data[cbp->startIdx];
+ cbp->startIdx =(cbp->startIdx + 1) % kQSIZE;
+ cbp->numFull -= 1;
+
+ /* let a waiting writer know that there is room */
+ PR_NotifyCondVar(cbp->notFull);
+ PR_Unlock(cbp->bufLock);
+
+ return (data);
+}
+
+
+/************************************************************************/
+
+static int alive;
+
+static void PR_CALLBACK CXReader(void *arg)
+{
+ CircBuf *cbp = (CircBuf *)arg;
+ PRInt32 i, n;
+ void *data;
+
+ n = count / 2;
+ for (i = 0; i < n; i++) {
+ data = GetCBData(cbp);
+ if ((int)data != i)
+ if (debug_mode) printf("data mismatch at for i = %d usec\n", i);
+ }
+
+ PR_EnterMonitor(mon);
+ --alive;
+ PR_Notify(mon);
+ PR_ExitMonitor(mon);
+}
+
+static void PR_CALLBACK CXWriter(void *arg)
+{
+ CircBuf *cbp = (CircBuf *)arg;
+ PRInt32 i, n;
+
+ n = count / 2;
+ for (i = 0; i < n; i++)
+ PutCBData(cbp, (void *)i);
+
+ PR_EnterMonitor(mon);
+ --alive;
+ PR_Notify(mon);
+ PR_ExitMonitor(mon);
+}
+
+static void CondWaitContextSwitch(PRThreadScope scope1, PRThreadScope scope2)
+{
+ PRThread *t1, *t2;
+ CircBuf *cbp;
+
+ PR_EnterMonitor(mon);
+
+ alive = 2;
+
+ cbp = NewCB();
+
+ t1 = PR_CreateThread(PR_USER_THREAD,
+ CXReader, cbp,
+ PR_PRIORITY_NORMAL,
+ scope1,
+ PR_UNJOINABLE_THREAD,
+ 0);
+ PR_ASSERT(t1);
+ t2 = PR_CreateThread(PR_USER_THREAD,
+ CXWriter, cbp,
+ PR_PRIORITY_NORMAL,
+ scope2,
+ PR_UNJOINABLE_THREAD,
+ 0);
+ PR_ASSERT(t2);
+
+ /* Wait for both of the threads to exit */
+ while (alive) {
+ PR_Wait(mon, PR_INTERVAL_NO_TIMEOUT);
+ }
+
+ DeleteCB(cbp);
+
+ PR_ExitMonitor(mon);
+}
+
+static void CondWaitContextSwitchUU(void)
+{
+ CondWaitContextSwitch(PR_LOCAL_THREAD, PR_LOCAL_THREAD);
+}
+
+static void CondWaitContextSwitchUK(void)
+{
+ CondWaitContextSwitch(PR_LOCAL_THREAD, PR_GLOBAL_THREAD);
+}
+
+static void CondWaitContextSwitchKK(void)
+{
+ CondWaitContextSwitch(PR_GLOBAL_THREAD, PR_GLOBAL_THREAD);
+}
+
+/************************************************************************/
+
+static void Measure(void (*func)(void), const char *msg)
+{
+ PRIntervalTime start, stop;
+ double d;
+
+ start = PR_IntervalNow();
+ (*func)();
+ stop = PR_IntervalNow();
+
+ d = (double)PR_IntervalToMicroseconds(stop - start);
+
+ if (debug_mode) printf("%40s: %6.2f usec\n", msg, d / count);
+
+ if (0 == d) failed = PR_TRUE;
+}
+
+static PRIntn PR_CALLBACK RealMain(int argc, char **argv)
+{
+ /* The command line argument: -d is used to determine if the test is being run
+ in debug mode. The regress tool requires only one line output:PASS or FAIL.
+ All of the printfs associated with this test has been handled with a if (debug_mode)
+ test.
+ Usage: test_name [-d] [-c n]
+ */
+ PLOptStatus os;
+ PLOptState *opt = PL_CreateOptState(argc, argv, "dc:");
+ while (PL_OPT_EOL != (os = PL_GetNextOpt(opt)))
+ {
+ if (PL_OPT_BAD == os) continue;
+ switch (opt->option)
+ {
+ case 'd': /* debug mode */
+ debug_mode = 1;
+ break;
+ case 'c': /* loop count */
+ count = atoi(opt->value);
+ break;
+ default:
+ break;
+ }
+ }
+ PL_DestroyOptState(opt);
+
+ if (0 == count) count = DEFAULT_COUNT;
+
+ mon = PR_NewMonitor();
+
+ Measure(CondWaitContextSwitchUU, "cond var wait context switch- user/user");
+ Measure(CondWaitContextSwitchUK, "cond var wait context switch- user/kernel");
+ Measure(CondWaitContextSwitchKK, "cond var wait context switch- kernel/kernel");
+
+ PR_DestroyMonitor(mon);
+
+ if (debug_mode) printf("%s\n", (failed) ? "FAILED" : "PASSED");
+
+ if(failed)
+ return 1;
+ else
+ return 0;
+}
+
+
+int main(int argc, char *argv[])
+{
+ PRIntn rv;
+
+ PR_STDIO_INIT();
+ rv = PR_Initialize(RealMain, argc, argv, 0);
+ return rv;
+} /* main */
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