diff options
Diffstat (limited to 'nsprpub/pr/src/cplus/tests/switch.cpp')
| -rw-r--r-- | nsprpub/pr/src/cplus/tests/switch.cpp | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/nsprpub/pr/src/cplus/tests/switch.cpp b/nsprpub/pr/src/cplus/tests/switch.cpp new file mode 100644 index 0000000000..4cb14c48fb --- /dev/null +++ b/nsprpub/pr/src/cplus/tests/switch.cpp @@ -0,0 +1,234 @@ +/* -*- 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.cpp +** Description: trying to time context switches +*/ + +#include "rccv.h" +#include "rcinrval.h" +#include "rclock.h" +#include "rcthread.h" + +#include <prio.h> +#include <prlog.h> +#include <prprf.h> +#include <plerror.h> +#include <plgetopt.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; + +class Home: public RCCondition +{ +public: + virtual ~Home(); + Home(Home *link, RCLock* ml); + +public: + Home *next; + RCLock* ml; + PRBool twiddle; +}; /* Home */ + +Home::~Home() { } + +Home::Home(Home *link, RCLock* lock): RCCondition(lock) +{ + ml = lock; + next = link; + twiddle = PR_FALSE; +} /* Home::Home */ + +class Shared: public Home, public RCThread +{ +public: + Shared(RCThread::Scope scope, Home* link, RCLock* ml); + +private: + ~Shared(); + void RootFunction(); +}; /* Shared */ + +Shared::Shared(RCThread::Scope scope, Home* link, RCLock* lock): + Home(link, lock), RCThread(scope, RCThread::joinable) { } + +Shared::~Shared() { } + +void Shared::RootFunction() +{ + PRStatus status = PR_SUCCESS; + while (PR_SUCCESS == status) + { + RCEnter entry(ml); + while (twiddle && (PR_SUCCESS == status)) status = Wait(); + if (verbosity) PR_fprintf(debug_out, "+"); + twiddle = PR_TRUE; + next->twiddle = PR_FALSE; + next->Notify(); + } +} /* Shared::RootFunction */ + +static void Help(void) +{ + debug_out = PR_STDOUT; + + PR_fprintf( + debug_out, "Usage: >./switch [-d] [-c n] [-t n] [-T n] [-G]\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 n\tglobal threads only (default: FALSE)\n"); + PR_fprintf(debug_out, "-C n\tconcurrency setting (default: 1)\n"); +} /* Help */ + +PRIntn main(PRIntn argc, char **argv) +{ + PLOptStatus os; + PRStatus status; + PRBool help = PR_FALSE; + PRUintn concurrency = 1; + RCThread::Scope thread_scope = RCThread::local; + 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 = RCThread::global; + 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"); + } + + /* + ** The interesting part starts here + */ + RCLock lock; + Shared* shared; + Home home(NULL, &lock); + Home* link = &home; + RCInterval timein, timeout = 0; + + /* Build up the string of objects */ + for (thread_count = 1; thread_count <= thread_limit; ++thread_count) + { + shared = new Shared(thread_scope, link, &lock); + shared->Start(); /* make it run */ + link = (Home*)shared; + } + + /* Pass the message around the horn a few times */ + for (loop_count = 1; loop_count <= loop_limit; ++loop_count) + { + timein.SetToNow(); + for (inner_count = 0; inner_count < INNER_LOOPS; ++inner_count) + { + RCEnter entry(&lock); + home.twiddle = PR_TRUE; + shared->twiddle = PR_FALSE; + shared->Notify(); + while (home.twiddle) + { + failed = (PR_FAILURE == home.Wait()) ? PR_TRUE : PR_FALSE; + } + } + timeout += (RCInterval(RCInterval::now) - timein); + } + + /* Figure out how well we did */ + if (debug_mode) + { + average = timeout.ToMicroseconds() + / (INNER_LOOPS * loop_limit * thread_count); + PR_fprintf( + debug_out, "Average switch times %d usecs for %d threads\n", + average, thread_limit); + } + + /* Start reclamation process */ + link = shared; + for (thread_count = 1; thread_count <= thread_limit; ++thread_count) + { + if (&home == link) break; + status = ((Shared*)link)->Interrupt(); + 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 = shared->Join(); + if (PR_SUCCESS != status) + { + failed = PR_TRUE; + if (debug_mode) + PL_FPrintError(debug_out, "Failed to join"); + } + if (&home == link) break; + shared = (Shared*)link; + } + + PR_fprintf(PR_STDOUT, ((failed) ? "FAILED\n" : "PASSED\n")); + + failed |= (PR_SUCCESS == RCPrimordialThread::Cleanup()); + + return ((failed) ? 1 : 0); +} /* main */ + +/* switch.c */ |