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292 lines
6.8 KiB
C
292 lines
6.8 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/***********************************************************************
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** 1996 - Netscape Communications Corporation
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**
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** Name: cvar.c
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**
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** Description: Tests Condition Variable Operations
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**
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** Modification History:
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** 13-May-97 AGarcia- Converted the test to accomodate the debug_mode flag.
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** The debug mode will print all of the printfs associated with this test.
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** The regress mode will be the default mode. Since the regress tool limits
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** the output to a one line status:PASS or FAIL,all of the printf statements
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** have been handled with an if (debug_mode) statement.
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** 04-June-97 AGarcia removed the Test_Result function. Regress tool has been updated to
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** recognize the return code from tha main program.
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** 12-June-97 Revert to return code 0 and 1.
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***********************************************************************/
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/***********************************************************************
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** Includes
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***********************************************************************/
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#include "nspr.h"
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/* Used to get the command line option */
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#include "plgetopt.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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PRMonitor *mon;
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#define DEFAULT_COUNT 1000
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PRInt32 count = 0;
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PRIntn debug_mode;
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#define kQSIZE 1
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typedef struct {
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PRLock *bufLock;
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int startIdx;
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int numFull;
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PRCondVar *notFull;
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PRCondVar *notEmpty;
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void *data[kQSIZE];
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} CircBuf;
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static PRBool failed = PR_FALSE;
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/*
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** NewCB creates and initializes a new circular buffer.
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*/
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static CircBuf* NewCB(void)
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{
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CircBuf *cbp;
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cbp = PR_NEW(CircBuf);
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if (cbp == NULL)
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return (NULL);
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cbp->bufLock = PR_NewLock();
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cbp->startIdx = 0;
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cbp->numFull = 0;
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cbp->notFull = PR_NewCondVar(cbp->bufLock);
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cbp->notEmpty = PR_NewCondVar(cbp->bufLock);
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return (cbp);
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}
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/*
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** DeleteCB frees a circular buffer.
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*/
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static void DeleteCB(CircBuf *cbp)
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{
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PR_DestroyLock(cbp->bufLock);
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PR_DestroyCondVar(cbp->notFull);
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PR_DestroyCondVar(cbp->notEmpty);
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PR_DELETE(cbp);
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}
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/*
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** PutCBData puts new data on the queue. If the queue is full, it waits
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** until there is room.
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*/
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static void PutCBData(CircBuf *cbp, void *data)
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{
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PR_Lock(cbp->bufLock);
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/* wait while the buffer is full */
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while (cbp->numFull == kQSIZE)
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PR_WaitCondVar(cbp->notFull,PR_INTERVAL_NO_TIMEOUT);
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cbp->data[(cbp->startIdx + cbp->numFull) % kQSIZE] = data;
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cbp->numFull += 1;
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/* let a waiting reader know that there is data */
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PR_NotifyCondVar(cbp->notEmpty);
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PR_Unlock(cbp->bufLock);
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}
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/*
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** GetCBData gets the oldest data on the queue. If the queue is empty, it waits
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** until new data appears.
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*/
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static void* GetCBData(CircBuf *cbp)
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{
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void *data;
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PR_Lock(cbp->bufLock);
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/* wait while the buffer is empty */
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while (cbp->numFull == 0)
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PR_WaitCondVar(cbp->notEmpty,PR_INTERVAL_NO_TIMEOUT);
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data = cbp->data[cbp->startIdx];
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cbp->startIdx =(cbp->startIdx + 1) % kQSIZE;
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cbp->numFull -= 1;
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/* let a waiting writer know that there is room */
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PR_NotifyCondVar(cbp->notFull);
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PR_Unlock(cbp->bufLock);
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return (data);
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}
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/************************************************************************/
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static int alive;
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static void PR_CALLBACK CXReader(void *arg)
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{
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CircBuf *cbp = (CircBuf *)arg;
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PRInt32 i, n;
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void *data;
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n = count / 2;
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for (i = 0; i < n; i++) {
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data = GetCBData(cbp);
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if ((int)data != i)
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if (debug_mode) printf("data mismatch at for i = %d usec\n", i);
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}
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PR_EnterMonitor(mon);
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--alive;
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PR_Notify(mon);
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PR_ExitMonitor(mon);
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}
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static void PR_CALLBACK CXWriter(void *arg)
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{
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CircBuf *cbp = (CircBuf *)arg;
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PRInt32 i, n;
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n = count / 2;
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for (i = 0; i < n; i++)
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PutCBData(cbp, (void *)i);
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PR_EnterMonitor(mon);
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--alive;
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PR_Notify(mon);
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PR_ExitMonitor(mon);
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}
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static void CondWaitContextSwitch(PRThreadScope scope1, PRThreadScope scope2)
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{
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PRThread *t1, *t2;
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CircBuf *cbp;
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PR_EnterMonitor(mon);
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alive = 2;
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cbp = NewCB();
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t1 = PR_CreateThread(PR_USER_THREAD,
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CXReader, cbp,
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PR_PRIORITY_NORMAL,
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scope1,
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PR_UNJOINABLE_THREAD,
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0);
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PR_ASSERT(t1);
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t2 = PR_CreateThread(PR_USER_THREAD,
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CXWriter, cbp,
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PR_PRIORITY_NORMAL,
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scope2,
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PR_UNJOINABLE_THREAD,
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0);
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PR_ASSERT(t2);
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/* Wait for both of the threads to exit */
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while (alive) {
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PR_Wait(mon, PR_INTERVAL_NO_TIMEOUT);
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}
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DeleteCB(cbp);
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PR_ExitMonitor(mon);
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}
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static void CondWaitContextSwitchUU(void)
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{
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CondWaitContextSwitch(PR_LOCAL_THREAD, PR_LOCAL_THREAD);
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}
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static void CondWaitContextSwitchUK(void)
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{
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CondWaitContextSwitch(PR_LOCAL_THREAD, PR_GLOBAL_THREAD);
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}
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static void CondWaitContextSwitchKK(void)
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{
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CondWaitContextSwitch(PR_GLOBAL_THREAD, PR_GLOBAL_THREAD);
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}
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/************************************************************************/
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static void Measure(void (*func)(void), const char *msg)
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{
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PRIntervalTime start, stop;
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double d;
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start = PR_IntervalNow();
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(*func)();
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stop = PR_IntervalNow();
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d = (double)PR_IntervalToMicroseconds(stop - start);
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if (debug_mode) printf("%40s: %6.2f usec\n", msg, d / count);
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if (0 == d) failed = PR_TRUE;
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}
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static PRIntn PR_CALLBACK RealMain(int argc, char **argv)
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{
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/* The command line argument: -d is used to determine if the test is being run
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in debug mode. The regress tool requires only one line output:PASS or FAIL.
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All of the printfs associated with this test has been handled with a if (debug_mode)
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test.
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Usage: test_name [-d] [-c n]
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*/
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PLOptStatus os;
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PLOptState *opt = PL_CreateOptState(argc, argv, "dc:");
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while (PL_OPT_EOL != (os = PL_GetNextOpt(opt)))
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{
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if (PL_OPT_BAD == os) continue;
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switch (opt->option)
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{
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case 'd': /* debug mode */
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debug_mode = 1;
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break;
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case 'c': /* loop count */
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count = atoi(opt->value);
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break;
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default:
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break;
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}
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}
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PL_DestroyOptState(opt);
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if (0 == count) count = DEFAULT_COUNT;
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mon = PR_NewMonitor();
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Measure(CondWaitContextSwitchUU, "cond var wait context switch- user/user");
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Measure(CondWaitContextSwitchUK, "cond var wait context switch- user/kernel");
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Measure(CondWaitContextSwitchKK, "cond var wait context switch- kernel/kernel");
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PR_DestroyMonitor(mon);
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if (debug_mode) printf("%s\n", (failed) ? "FAILED" : "PASSED");
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if(failed)
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return 1;
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else
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return 0;
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}
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int main(int argc, char *argv[])
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{
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PRIntn rv;
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PR_STDIO_INIT();
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rv = PR_Initialize(RealMain, argc, argv, 0);
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return rv;
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} /* main */
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