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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 ***** */
+
+/*
+** 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"
+
+#include "private/pprio.h"
+
+#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 */
+
+int main(int argc, char **argv)
+{
+ PRIntn result;
+ PR_STDIO_INIT();
+ result = PR_Initialize(Switch, argc, argv, 0);
+ return result;
+} /* main */
+
+/* switch.c */
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