The Tor Browser: nsprpub/pr/tests/lockfile.c@44a2da4a2ab2 (annotated)

nsprpub/pr/tests/lockfile.c@44a2da4a2ab2 (annotated)

nsprpub/pr/tests/lockfile.c

Fri, 16 Jan 2015 04:50:19 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Fri, 16 Jan 2015 04:50:19 +0100
branch: TOR_BUG_9701
changeset 13: 44a2da4a2ab2
permissions: -rw-r--r--

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

 /* -*- 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:        lockfile.c
 ** Purpose:     test basic locking functions
 **              Just because this times stuff, don't think its a perforamnce
 **              test!!!
 **
 ** Modification History:
 ** 19-May-97 AGarcia- Converted the test to accomodate the debug_mode flag.
 **	         The debug mode will print all of the printfs associated with this test.
 **			 The regress mode will be the default mode. Since the regress tool limits
 **           the output to a one line status:PASS or FAIL,all of the printf statements
 **			 have been handled with an if (debug_mode) statement.
 ** 04-June-97 AGarcia removed the Test_Result function. Regress tool has been updated to
 **			recognize the return code from tha main program.
 ***********************************************************************/
 /***********************************************************************
 ** Includes
 ***********************************************************************/
 /* Used to get the command line option */
 #include "plgetopt.h"
 #include "prcmon.h"
 #include "prerror.h"
 #include "prinit.h"
 #include "prinrval.h"
 #include "prlock.h"
 #include "prlog.h"
 #include "prmon.h"
 #include "prthread.h"
 #include "prtypes.h"
 #include "private/pprio.h"
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 PRIntn failed_already=0;
 PRIntn debug_mode;
 const static PRIntervalTime contention_interval = 50;
 typedef struct LockContentious_s {
     PRLock *ml;
     PRInt32 loops;
     PRIntervalTime overhead;
     PRIntervalTime interval;
 } LockContentious_t;
 #define LOCKFILE "prlock.fil"
 static PRIntervalTime NonContentiousLock(PRInt32 loops)
 {
     PRFileDesc *_lockfile;
     while (loops-- > 0)
     {
         _lockfile = PR_Open(LOCKFILE, PR_CREATE_FILE|PR_RDWR, 0666);
         if (!_lockfile) {
             if (debug_mode) printf(
                 "could not create lockfile: %d [%d]\n",
                 PR_GetError(), PR_GetOSError());
             return PR_INTERVAL_NO_TIMEOUT;
         }
         PR_LockFile(_lockfile);
         PR_UnlockFile(_lockfile);
         PR_Close(_lockfile);
     }
     return 0;
 }  /* NonContentiousLock */
 static void PR_CALLBACK LockContender(void *arg)
 {
     LockContentious_t *contention = (LockContentious_t*)arg;
     PRFileDesc *_lockfile;
     while (contention->loops-- > 0)
     {
         _lockfile = PR_Open(LOCKFILE, PR_CREATE_FILE|PR_RDWR, 0666);
         if (!_lockfile) {
             if (debug_mode) printf(
                 "could not create lockfile: %d [%d]\n",
                 PR_GetError(), PR_GetOSError());
             break;
         }
         PR_LockFile(_lockfile);
         PR_Sleep(contention->interval);
         PR_UnlockFile(_lockfile);
         PR_Close(_lockfile);
     }
 }  /* LockContender */
 /*
 ** Win16 requires things passed to Threads not be on the stack
 */
 static LockContentious_t contention;
 static PRIntervalTime ContentiousLock(PRInt32 loops)
 {
     PRStatus status;
     PRThread *thread = NULL;
     PRIntervalTime overhead, timein = PR_IntervalNow();
     contention.loops = loops;
     contention.overhead = 0;
     contention.ml = PR_NewLock();
     contention.interval = contention_interval;
     thread = PR_CreateThread(
         PR_USER_THREAD, LockContender, &contention,
         PR_PRIORITY_LOW, PR_LOCAL_THREAD, PR_JOINABLE_THREAD, 0);
     PR_ASSERT(thread != NULL);
     overhead = PR_IntervalNow() - timein;
     while (contention.loops > 0)
     {
         PR_Lock(contention.ml);
         contention.overhead += contention.interval;
         PR_Sleep(contention.interval);
         PR_Unlock(contention.ml);
     }
     timein = PR_IntervalNow();
     status = PR_JoinThread(thread);
     PR_DestroyLock(contention.ml);
     overhead += (PR_IntervalNow() - timein);
     return overhead + contention.overhead;
 }  /* ContentiousLock */
 static PRIntervalTime Test(
     const char* msg, PRIntervalTime (*test)(PRInt32 loops),
     PRInt32 loops, PRIntervalTime overhead)
 {
     /*
      * overhead - overhead not measured by the test.
      * duration - wall clock time it took to perform test.
      * predicted - extra time test says should not be counted
      *
      * Time accountable to the test is duration - overhead - predicted
      * All times are Intervals and accumulated for all iterations.
      */
     PRFloat64 elapsed;
     PRIntervalTime accountable, duration;
     PRUintn spaces = strlen(msg);
     PRIntervalTime timeout, timein = PR_IntervalNow();
     PRIntervalTime predicted = test(loops);
     timeout = PR_IntervalNow();
     duration = timeout - timein;
     accountable = duration - predicted;
     accountable -= overhead;
     elapsed = (PRFloat64)PR_IntervalToMicroseconds(accountable);
     if (debug_mode) printf("%s:", msg);
     while (spaces++ < 50) if (debug_mode) printf(" ");
     if ((PRInt32)accountable < 0) {
         if (debug_mode) printf("*****.** usecs/iteration\n");
     } else {
         if (debug_mode) printf("%8.2f usecs/iteration\n", elapsed/loops);
     }
     return duration;
 }  /* Test */
 int main(int argc,  char **argv)
 {
     PRIntervalTime duration;
     PRUint32 cpu, cpus = 2;
     PRInt32 loops = 100;
 	/* The command line argument: -d is used to determine if the test is being run
 	in debug mode. The regress tool requires only one line output:PASS or FAIL.
 	All of the printfs associated with this test has been handled with a if (debug_mode)
 	test.
 	Usage: test_name -d
 	*/
 	PLOptStatus os;
 	PLOptState *opt = PL_CreateOptState(argc, argv, "d:");
 	while (PL_OPT_EOL != (os = PL_GetNextOpt(opt)))
     {
 		if (PL_OPT_BAD == os) continue;
         switch (opt->option)
         {
         case 'd':  /* debug mode */
 			debug_mode = 1;
             break;
          default:
             break;
         }
     }
 	PL_DestroyOptState(opt);
  /* main test */
     PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
     PR_STDIO_INIT();
     if (argc > 1) loops = atoi(argv[1]);
     if (loops == 0) loops = 100;
     if (debug_mode) printf("Lock: Using %d loops\n", loops);
     cpus = (argc < 3) ? 2 : atoi(argv[2]);
     if (cpus == 0) cpus = 2;
     if (debug_mode) printf("Lock: Using %d cpu(s)\n", cpus);
     for (cpu = 1; cpu <= cpus; ++cpu)
     {
         if (debug_mode) printf("\nLockFile: Using %d CPU(s)\n", cpu);
         PR_SetConcurrency(cpu);
         duration = Test("LockFile non-contentious locking/unlocking", NonContentiousLock, loops, 0);
         (void)Test("LockFile contentious locking/unlocking", ContentiousLock, loops, duration);
     }
     PR_Delete(LOCKFILE);  /* try to get rid of evidence */
     if (debug_mode) printf("%s: test %s\n", "Lock(mutex) test", ((failed_already) ? "failed" : "passed"));
 	if(failed_already)
 		return 1;
 	else
 		return 0;
 }  /* main */
 /* testlock.c */

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nsprpub/pr/tests/lockfile.c@44a2da4a2ab2 (annotated)

nsprpub/pr/tests/lockfile.c