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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 1.0 (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 [-d] [-c n] [-t n] [-T n] [-G]\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 n\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 */
-