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lightning-sunbird  0.9+nobinonly
interval.cpp
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
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00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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00014  *
00015  * The Original Code is the Netscape Portable Runtime (NSPR).
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00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998-2000
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00022  * Contributor(s):
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00024  * Alternatively, the contents of this file may be used under the terms of
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00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 /* interval.cpp - a test program */
00039 
00040 #include "rclock.h"
00041 #include "rcthread.h"
00042 #include "rcinrval.h"
00043 #include "rccv.h"
00044 
00045 #include <prio.h>
00046 #include <prlog.h>
00047 #include <prprf.h>
00048 
00049 #define DEFAULT_ITERATIONS 100
00050 
00051 PRIntn main(PRIntn argc, char **argv)
00052 {
00053     RCLock ml;
00054     PRStatus rv;
00055     RCCondition cv(&ml);
00056 
00057     RCInterval now, timeout, epoch, elapsed;
00058     PRFileDesc *output = PR_GetSpecialFD(PR_StandardOutput);
00059     PRIntn msecs, seconds, loops, iterations = DEFAULT_ITERATIONS;
00060 
00061     /* slow, agonizing waits */
00062     for (seconds = 0; seconds < 10; ++seconds)
00063     {
00064         timeout = RCInterval::FromSeconds(seconds);
00065         cv.SetTimeout(timeout);
00066         {
00067             RCEnter lock(&ml);
00068 
00069             epoch.SetToNow();
00070 
00071             rv = cv.Wait();
00072             PR_ASSERT(PR_SUCCESS == rv);
00073 
00074             now = RCInterval(RCInterval::now);
00075             elapsed = now - epoch;
00076         }
00077 
00078         PR_fprintf(
00079             output, "Waiting %u seconds took %s%u milliseconds\n",
00080             seconds, ((elapsed < timeout)? "**" : ""),
00081             elapsed.ToMilliseconds());
00082     }
00083 
00084     /* more slow, agonizing sleeps */
00085     for (seconds = 0; seconds < 10; ++seconds)
00086     {
00087         timeout = RCInterval::FromSeconds(seconds);
00088         {
00089             epoch.SetToNow();
00090 
00091             rv = RCThread::Sleep(timeout);
00092             PR_ASSERT(PR_SUCCESS == rv);
00093 
00094             now = RCInterval(RCInterval::now);
00095             elapsed = now - epoch;
00096         }
00097 
00098         PR_fprintf(
00099             output, "Sleeping %u seconds took %s%u milliseconds\n",
00100             seconds, ((elapsed < timeout)? "**" : ""),
00101             elapsed.ToMilliseconds());
00102     }
00103 
00104     /* fast, spritely little devils */
00105     for (msecs = 10; msecs < 100; msecs += 10)
00106     {
00107         timeout = RCInterval::FromMilliseconds(msecs);
00108         cv.SetTimeout(timeout);
00109         {
00110             RCEnter lock(&ml);
00111 
00112             epoch.SetToNow();
00113 
00114             for (loops = 0; loops < iterations; ++loops)
00115             {
00116                 rv = cv.Wait();
00117                 PR_ASSERT(PR_SUCCESS == rv);
00118             }
00119 
00120             now = RCInterval(RCInterval::now);
00121             elapsed = now - epoch;
00122         }
00123         elapsed /= iterations;
00124 
00125         PR_fprintf(
00126             output, "Waiting %u msecs took %s%u milliseconds average\n",
00127             msecs, ((elapsed < timeout)? "**" : ""), elapsed.ToMilliseconds());
00128     }
00129     return 0;
00130 }  /* main */
00131 
00132 /* interval.cpp */
00133