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Diffstat (limited to 'nsprpub/pr/tests/cvar.c')
| -rw-r--r-- | nsprpub/pr/tests/cvar.c | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/nsprpub/pr/tests/cvar.c b/nsprpub/pr/tests/cvar.c new file mode 100644 index 0000000000..4dc891d3f9 --- /dev/null +++ b/nsprpub/pr/tests/cvar.c @@ -0,0 +1,309 @@ +/* -*- 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/. */ + +/*********************************************************************** +** 1996 - Netscape Communications Corporation +** +** Name: cvar.c +** +** Description: Tests Condition Variable Operations +** +** Modification History: +** 13-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. +** 12-June-97 Revert to return code 0 and 1. +***********************************************************************/ + +/*********************************************************************** +** Includes +***********************************************************************/ + +#include "nspr.h" + +/* Used to get the command line option */ +#include "plgetopt.h" + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +PRMonitor *mon; +#define DEFAULT_COUNT 1000 +PRInt32 count = 0; +PRIntn debug_mode; + +#define kQSIZE 1 + +typedef struct { + PRLock *bufLock; + int startIdx; + int numFull; + PRCondVar *notFull; + PRCondVar *notEmpty; + void *data[kQSIZE]; +} CircBuf; + +static PRBool failed = PR_FALSE; + +/* +** NewCB creates and initializes a new circular buffer. +*/ +static CircBuf* NewCB(void) +{ + CircBuf *cbp; + + cbp = PR_NEW(CircBuf); + if (cbp == NULL) { + return (NULL); + } + + cbp->bufLock = PR_NewLock(); + cbp->startIdx = 0; + cbp->numFull = 0; + cbp->notFull = PR_NewCondVar(cbp->bufLock); + cbp->notEmpty = PR_NewCondVar(cbp->bufLock); + + return (cbp); +} + +/* +** DeleteCB frees a circular buffer. +*/ +static void DeleteCB(CircBuf *cbp) +{ + PR_DestroyLock(cbp->bufLock); + PR_DestroyCondVar(cbp->notFull); + PR_DestroyCondVar(cbp->notEmpty); + PR_DELETE(cbp); +} + + +/* +** PutCBData puts new data on the queue. If the queue is full, it waits +** until there is room. +*/ +static void PutCBData(CircBuf *cbp, void *data) +{ + PR_Lock(cbp->bufLock); + /* wait while the buffer is full */ + while (cbp->numFull == kQSIZE) { + PR_WaitCondVar(cbp->notFull,PR_INTERVAL_NO_TIMEOUT); + } + cbp->data[(cbp->startIdx + cbp->numFull) % kQSIZE] = data; + cbp->numFull += 1; + + /* let a waiting reader know that there is data */ + PR_NotifyCondVar(cbp->notEmpty); + PR_Unlock(cbp->bufLock); + +} + + +/* +** GetCBData gets the oldest data on the queue. If the queue is empty, it waits +** until new data appears. +*/ +static void* GetCBData(CircBuf *cbp) +{ + void *data; + + PR_Lock(cbp->bufLock); + /* wait while the buffer is empty */ + while (cbp->numFull == 0) { + PR_WaitCondVar(cbp->notEmpty,PR_INTERVAL_NO_TIMEOUT); + } + data = cbp->data[cbp->startIdx]; + cbp->startIdx =(cbp->startIdx + 1) % kQSIZE; + cbp->numFull -= 1; + + /* let a waiting writer know that there is room */ + PR_NotifyCondVar(cbp->notFull); + PR_Unlock(cbp->bufLock); + + return (data); +} + + +/************************************************************************/ + +static int alive; + +static void PR_CALLBACK CXReader(void *arg) +{ + CircBuf *cbp = (CircBuf *)arg; + PRInt32 i, n; + void *data; + + n = count / 2; + for (i = 0; i < n; i++) { + data = GetCBData(cbp); + if ((int)data != i) + if (debug_mode) { + printf("data mismatch at for i = %d usec\n", i); + } + } + + PR_EnterMonitor(mon); + --alive; + PR_Notify(mon); + PR_ExitMonitor(mon); +} + +static void PR_CALLBACK CXWriter(void *arg) +{ + CircBuf *cbp = (CircBuf *)arg; + PRInt32 i, n; + + n = count / 2; + for (i = 0; i < n; i++) { + PutCBData(cbp, (void *)i); + } + + PR_EnterMonitor(mon); + --alive; + PR_Notify(mon); + PR_ExitMonitor(mon); +} + +static void CondWaitContextSwitch(PRThreadScope scope1, PRThreadScope scope2) +{ + PRThread *t1, *t2; + CircBuf *cbp; + + PR_EnterMonitor(mon); + + alive = 2; + + cbp = NewCB(); + + t1 = PR_CreateThread(PR_USER_THREAD, + CXReader, cbp, + PR_PRIORITY_NORMAL, + scope1, + PR_UNJOINABLE_THREAD, + 0); + PR_ASSERT(t1); + t2 = PR_CreateThread(PR_USER_THREAD, + CXWriter, cbp, + PR_PRIORITY_NORMAL, + scope2, + PR_UNJOINABLE_THREAD, + 0); + PR_ASSERT(t2); + + /* Wait for both of the threads to exit */ + while (alive) { + PR_Wait(mon, PR_INTERVAL_NO_TIMEOUT); + } + + DeleteCB(cbp); + + PR_ExitMonitor(mon); +} + +static void CondWaitContextSwitchUU(void) +{ + CondWaitContextSwitch(PR_LOCAL_THREAD, PR_LOCAL_THREAD); +} + +static void CondWaitContextSwitchUK(void) +{ + CondWaitContextSwitch(PR_LOCAL_THREAD, PR_GLOBAL_THREAD); +} + +static void CondWaitContextSwitchKK(void) +{ + CondWaitContextSwitch(PR_GLOBAL_THREAD, PR_GLOBAL_THREAD); +} + +/************************************************************************/ + +static void Measure(void (*func)(void), const char *msg) +{ + PRIntervalTime start, stop; + double d; + + start = PR_IntervalNow(); + (*func)(); + stop = PR_IntervalNow(); + + d = (double)PR_IntervalToMicroseconds(stop - start); + + if (debug_mode) { + printf("%40s: %6.2f usec\n", msg, d / count); + } + + if (0 == d) { + failed = PR_TRUE; + } +} + +static PRIntn PR_CALLBACK RealMain(int argc, char **argv) +{ + /* 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] [-c n] + */ + PLOptStatus os; + PLOptState *opt = PL_CreateOptState(argc, argv, "dc:"); + 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; + case 'c': /* loop count */ + count = atoi(opt->value); + break; + default: + break; + } + } + PL_DestroyOptState(opt); + + if (0 == count) { + count = DEFAULT_COUNT; + } + + mon = PR_NewMonitor(); + + Measure(CondWaitContextSwitchUU, "cond var wait context switch- user/user"); + Measure(CondWaitContextSwitchUK, "cond var wait context switch- user/kernel"); + Measure(CondWaitContextSwitchKK, "cond var wait context switch- kernel/kernel"); + + PR_DestroyMonitor(mon); + + if (debug_mode) { + printf("%s\n", (failed) ? "FAILED" : "PASSED"); + } + + if(failed) { + return 1; + } + else { + return 0; + } +} + + +int main(int argc, char *argv[]) +{ + PRIntn rv; + + PR_STDIO_INIT(); + rv = PR_Initialize(RealMain, argc, argv, 0); + return rv; +} /* main */ |