mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-04 19:33:18 +00:00
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 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/*
|
|
** 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 */
|