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
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+++ 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 */