mirror of
https://github.com/mozilla/gecko-dev.git
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238 lines
6.4 KiB
C
238 lines
6.4 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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** File: switch.c
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** Description: trying to time context switches
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*/
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#include "prinit.h"
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#include "prcvar.h"
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#include "prmem.h"
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#include "prinrval.h"
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#include "prlock.h"
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#include "prlog.h"
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#include "prthread.h"
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#include "prprf.h"
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#include "plerror.h"
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#include "plgetopt.h"
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#include "private/pprio.h"
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#include <stdlib.h>
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#define INNER_LOOPS 100
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#define DEFAULT_LOOPS 100
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#define DEFAULT_THREADS 10
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static PRFileDesc *debug_out = NULL;
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static PRBool debug_mode = PR_FALSE, verbosity = PR_FALSE, failed = PR_FALSE;
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typedef struct Shared
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{
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PRLock *ml;
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PRCondVar *cv;
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PRBool twiddle;
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PRThread *thread;
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struct Shared *next;
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} Shared;
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static void Help(void)
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{
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debug_out = PR_STDOUT;
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PR_fprintf(
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debug_out, "Usage: >./switch [-c n] [-t n] [-d] [-v] [-G] [-C n]\n");
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PR_fprintf(
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debug_out, "-c n\tloops at thread level (default: %d)\n", DEFAULT_LOOPS);
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PR_fprintf(
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debug_out, "-t n\tnumber of threads (default: %d)\n", DEFAULT_THREADS);
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PR_fprintf(debug_out, "-d\tturn on debugging output (default: FALSE)\n");
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PR_fprintf(debug_out, "-v\tturn on verbose output (default: FALSE)\n");
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PR_fprintf(debug_out, "-G\tglobal threads only (default: FALSE)\n");
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PR_fprintf(debug_out, "-C n\tconcurrency setting (default: 1)\n");
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} /* Help */
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static void PR_CALLBACK Notified(void *arg)
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{
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Shared *shared = (Shared*)arg;
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PRStatus status = PR_SUCCESS;
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while (PR_SUCCESS == status)
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{
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PR_Lock(shared->ml);
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while (shared->twiddle && (PR_SUCCESS == status))
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status = PR_WaitCondVar(shared->cv, PR_INTERVAL_NO_TIMEOUT);
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if (verbosity) PR_fprintf(debug_out, "+");
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shared->twiddle = PR_TRUE;
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shared->next->twiddle = PR_FALSE;
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PR_NotifyCondVar(shared->next->cv);
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PR_Unlock(shared->ml);
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}
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} /* Notified */
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static Shared home;
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PRIntn PR_CALLBACK Switch(PRIntn argc, char **argv)
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{
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PLOptStatus os;
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PRStatus status;
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PRBool help = PR_FALSE;
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PRUintn concurrency = 1;
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Shared *shared, *link;
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PRIntervalTime timein, timeout;
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PRThreadScope thread_scope = PR_LOCAL_THREAD;
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PRUintn thread_count, inner_count, loop_count, average;
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PRUintn thread_limit = DEFAULT_THREADS, loop_limit = DEFAULT_LOOPS;
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PLOptState *opt = PL_CreateOptState(argc, argv, "hdvc:t:C:G");
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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 'v': /* verbose mode */
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verbosity = PR_TRUE;
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case 'd': /* debug mode */
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debug_mode = PR_TRUE;
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break;
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case 'c': /* loop counter */
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loop_limit = atoi(opt->value);
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break;
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case 't': /* thread limit */
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thread_limit = atoi(opt->value);
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break;
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case 'C': /* Concurrency limit */
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concurrency = atoi(opt->value);
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break;
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case 'G': /* global threads only */
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thread_scope = PR_GLOBAL_THREAD;
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break;
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case 'h': /* help message */
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Help();
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help = PR_TRUE;
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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 (help) return -1;
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if (PR_TRUE == debug_mode)
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{
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debug_out = PR_STDOUT;
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PR_fprintf(debug_out, "Test parameters\n");
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PR_fprintf(debug_out, "\tThreads involved: %d\n", thread_limit);
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PR_fprintf(debug_out, "\tIteration limit: %d\n", loop_limit);
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PR_fprintf(debug_out, "\tConcurrency: %d\n", concurrency);
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PR_fprintf(
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debug_out, "\tThread type: %s\n",
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(PR_GLOBAL_THREAD == thread_scope) ? "GLOBAL" : "LOCAL");
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}
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PR_SetConcurrency(concurrency);
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link = &home;
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home.ml = PR_NewLock();
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home.cv = PR_NewCondVar(home.ml);
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home.twiddle = PR_FALSE;
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home.next = NULL;
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timeout = 0;
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for (thread_count = 1; thread_count <= thread_limit; ++thread_count)
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{
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shared = PR_NEWZAP(Shared);
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shared->ml = home.ml;
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shared->cv = PR_NewCondVar(home.ml);
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shared->twiddle = PR_TRUE;
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shared->next = link;
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link = shared;
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shared->thread = PR_CreateThread(
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PR_USER_THREAD, Notified, shared,
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PR_PRIORITY_HIGH, thread_scope,
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PR_JOINABLE_THREAD, 0);
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PR_ASSERT(shared->thread != NULL);
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if (NULL == shared->thread)
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failed = PR_TRUE;
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}
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for (loop_count = 1; loop_count <= loop_limit; ++loop_count)
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{
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timein = PR_IntervalNow();
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for (inner_count = 0; inner_count < INNER_LOOPS; ++inner_count)
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{
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PR_Lock(home.ml);
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home.twiddle = PR_TRUE;
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shared->twiddle = PR_FALSE;
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PR_NotifyCondVar(shared->cv);
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while (home.twiddle)
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{
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status = PR_WaitCondVar(home.cv, PR_INTERVAL_NO_TIMEOUT);
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if (PR_FAILURE == status)
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failed = PR_TRUE;
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}
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PR_Unlock(home.ml);
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}
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timeout += (PR_IntervalNow() - timein);
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}
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if (debug_mode)
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{
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average = PR_IntervalToMicroseconds(timeout)
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/ (INNER_LOOPS * loop_limit * thread_count);
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PR_fprintf(
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debug_out, "Average switch times %d usecs for %d threads\n",
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average, thread_limit);
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}
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link = shared;
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for (thread_count = 1; thread_count <= thread_limit; ++thread_count)
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{
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if (&home == link) break;
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status = PR_Interrupt(link->thread);
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if (PR_SUCCESS != status)
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{
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failed = PR_TRUE;
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if (debug_mode)
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PL_FPrintError(debug_out, "Failed to interrupt");
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}
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link = link->next;
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}
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for (thread_count = 1; thread_count <= thread_limit; ++thread_count)
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{
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link = shared->next;
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status = PR_JoinThread(shared->thread);
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if (PR_SUCCESS != status)
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{
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failed = PR_TRUE;
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if (debug_mode)
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PL_FPrintError(debug_out, "Failed to join");
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}
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PR_DestroyCondVar(shared->cv);
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PR_DELETE(shared);
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if (&home == link) break;
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shared = link;
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}
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PR_DestroyCondVar(home.cv);
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PR_DestroyLock(home.ml);
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PR_fprintf(PR_STDOUT, ((failed) ? "FAILED\n" : "PASSED\n"));
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return ((failed) ? 1 : 0);
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} /* Switch */
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int main(int argc, char **argv)
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{
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PRIntn result;
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PR_STDIO_INIT();
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result = PR_Initialize(Switch, argc, argv, 0);
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return result;
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} /* main */
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/* switch.c */
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