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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Netscape Public License
* Version 1.1 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
/*
** File: switch.c
** Description: trying to time context switches
*/
#include "prinit.h"
#include "prcvar.h"
#include "prmem.h"
#include "prinrval.h"
#include "prlock.h"
#include "prlog.h"
#include "prthread.h"
#include "prprf.h"
#include "plerror.h"
#include "plgetopt.h"
#if defined(XP_MAC)
#include "pprio.h"
#define printf PR_LogPrint
#else
#include "private/pprio.h"
#endif
#include <stdlib.h>
#define INNER_LOOPS 100
#define DEFAULT_LOOPS 100
#define DEFAULT_THREADS 10
static PRFileDesc *debug_out = NULL;
static PRBool debug_mode = PR_FALSE, verbosity = PR_FALSE, failed = PR_FALSE;
typedef struct Shared
{
PRLock *ml;
PRCondVar *cv;
PRBool twiddle;
PRThread *thread;
struct Shared *next;
} Shared;
static void Help(void)
{
debug_out = PR_STDOUT;
PR_fprintf(
debug_out, "Usage: >./switch [-c n] [-t n] [-d] [-v] [-G] [-C n]\n");
PR_fprintf(
debug_out, "-c n\tloops at thread level (default: %d)\n", DEFAULT_LOOPS);
PR_fprintf(
debug_out, "-t n\tnumber of threads (default: %d)\n", DEFAULT_THREADS);
PR_fprintf(debug_out, "-d\tturn on debugging output (default: FALSE)\n");
PR_fprintf(debug_out, "-v\tturn on verbose output (default: FALSE)\n");
PR_fprintf(debug_out, "-G\tglobal threads only (default: FALSE)\n");
PR_fprintf(debug_out, "-C n\tconcurrency setting (default: 1)\n");
} /* Help */
static void PR_CALLBACK Notified(void *arg)
{
Shared *shared = (Shared*)arg;
PRStatus status = PR_SUCCESS;
while (PR_SUCCESS == status)
{
PR_Lock(shared->ml);
while (shared->twiddle && (PR_SUCCESS == status))
status = PR_WaitCondVar(shared->cv, PR_INTERVAL_NO_TIMEOUT);
if (verbosity) PR_fprintf(debug_out, "+");
shared->twiddle = PR_TRUE;
shared->next->twiddle = PR_FALSE;
PR_NotifyCondVar(shared->next->cv);
PR_Unlock(shared->ml);
}
} /* Notified */
static Shared home;
PRIntn PR_CALLBACK Switch(PRIntn argc, char **argv)
{
PLOptStatus os;
PRStatus status;
PRBool help = PR_FALSE;
PRUintn concurrency = 1;
Shared *shared, *link;
PRIntervalTime timein, timeout;
PRThreadScope thread_scope = PR_LOCAL_THREAD;
PRUintn thread_count, inner_count, loop_count, average;
PRUintn thread_limit = DEFAULT_THREADS, loop_limit = DEFAULT_LOOPS;
PLOptState *opt = PL_CreateOptState(argc, argv, "hdvc:t:C:G");
while (PL_OPT_EOL != (os = PL_GetNextOpt(opt)))
{
if (PL_OPT_BAD == os) continue;
switch (opt->option)
{
case 'v': /* verbose mode */
verbosity = PR_TRUE;
case 'd': /* debug mode */
debug_mode = PR_TRUE;
break;
case 'c': /* loop counter */
loop_limit = atoi(opt->value);
break;
case 't': /* thread limit */
thread_limit = atoi(opt->value);
break;
case 'C': /* Concurrency limit */
concurrency = atoi(opt->value);
break;
case 'G': /* global threads only */
thread_scope = PR_GLOBAL_THREAD;
break;
case 'h': /* help message */
Help();
help = PR_TRUE;
break;
default:
break;
}
}
PL_DestroyOptState(opt);
if (help) return -1;
if (PR_TRUE == debug_mode)
{
debug_out = PR_STDOUT;
PR_fprintf(debug_out, "Test parameters\n");
PR_fprintf(debug_out, "\tThreads involved: %d\n", thread_limit);
PR_fprintf(debug_out, "\tIteration limit: %d\n", loop_limit);
PR_fprintf(debug_out, "\tConcurrency: %d\n", concurrency);
PR_fprintf(
debug_out, "\tThread type: %s\n",
(PR_GLOBAL_THREAD == thread_scope) ? "GLOBAL" : "LOCAL");
}
PR_SetConcurrency(concurrency);
link = &home;
home.ml = PR_NewLock();
home.cv = PR_NewCondVar(home.ml);
home.twiddle = PR_FALSE;
home.next = NULL;
timeout = 0;
for (thread_count = 1; thread_count <= thread_limit; ++thread_count)
{
shared = PR_NEWZAP(Shared);
shared->ml = home.ml;
shared->cv = PR_NewCondVar(home.ml);
shared->twiddle = PR_TRUE;
shared->next = link;
link = shared;
shared->thread = PR_CreateThread(
PR_USER_THREAD, Notified, shared,
PR_PRIORITY_HIGH, thread_scope,
PR_JOINABLE_THREAD, 0);
PR_ASSERT(shared->thread != NULL);
if (NULL == shared->thread)
failed = PR_TRUE;
}
for (loop_count = 1; loop_count <= loop_limit; ++loop_count)
{
timein = PR_IntervalNow();
for (inner_count = 0; inner_count < INNER_LOOPS; ++inner_count)
{
PR_Lock(home.ml);
home.twiddle = PR_TRUE;
shared->twiddle = PR_FALSE;
PR_NotifyCondVar(shared->cv);
while (home.twiddle)
{
status = PR_WaitCondVar(home.cv, PR_INTERVAL_NO_TIMEOUT);
if (PR_FAILURE == status)
failed = PR_TRUE;
}
PR_Unlock(home.ml);
}
timeout += (PR_IntervalNow() - timein);
}
if (debug_mode)
{
average = PR_IntervalToMicroseconds(timeout)
/ (INNER_LOOPS * loop_limit * thread_count);
PR_fprintf(
debug_out, "Average switch times %d usecs for %d threads\n",
average, thread_limit);
}
link = shared;
for (thread_count = 1; thread_count <= thread_limit; ++thread_count)
{
if (&home == link) break;
status = PR_Interrupt(link->thread);
if (PR_SUCCESS != status)
{
failed = PR_TRUE;
if (debug_mode)
PL_FPrintError(debug_out, "Failed to interrupt");
}
link = link->next;
}
for (thread_count = 1; thread_count <= thread_limit; ++thread_count)
{
link = shared->next;
status = PR_JoinThread(shared->thread);
if (PR_SUCCESS != status)
{
failed = PR_TRUE;
if (debug_mode)
PL_FPrintError(debug_out, "Failed to join");
}
PR_DestroyCondVar(shared->cv);
PR_DELETE(shared);
if (&home == link) break;
shared = link;
}
PR_DestroyCondVar(home.cv);
PR_DestroyLock(home.ml);
PR_fprintf(PR_STDOUT, ((failed) ? "FAILED\n" : "PASSED\n"));
return ((failed) ? 1 : 0);
} /* Switch */
PRIntn main(PRIntn argc, char **argv)
{
PRIntn result;
PR_STDIO_INIT();
result = PR_Initialize(Switch, argc, argv, 0);
return result;
} /* main */
/* switch.c */
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