diff options
Diffstat (limited to 'nsprpub/pr/tests/switch.c')
| -rw-r--r-- | nsprpub/pr/tests/switch.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/nsprpub/pr/tests/switch.c b/nsprpub/pr/tests/switch.c new file mode 100644 index 0000000000..43db7888fb --- /dev/null +++ b/nsprpub/pr/tests/switch.c @@ -0,0 +1,252 @@ +/* -*- 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 */ |