Bugzilla bug #30746: added a new test primblok.c to show that NSPR I/O

functions will hang when the primordial thread calls a native blocking
function.
Added file: primblok.c
Modified files: Makefile, Makefile.in, runtests.ksh

nsprpub/pr/tests/Makefile

@@ -116,6 +116,7 @@ CSRCS =             \
 	prftest.c		\
 	prftest1.c		\
 	prftest2.c		\
+	primblok.c		\
 	priotest.c		\
 	provider.c		\
 	prpoll.c		\

nsprpub/pr/tests/Makefile.in

@@ -120,6 +120,7 @@ CSRCS =             \
 	prftest.c		\
 	prftest1.c		\
 	prftest2.c		\
+	primblok.c		\
 	priotest.c		\
 	provider.c		\
 	prpoll.c		\

nsprpub/pr/tests/primblok.c

@@ -0,0 +1,129 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ * The contents of this file are subject to the Netscape Public License
+ * Version 1.1 (the "NPL"); you may not use this file except in
+ * compliance with the NPL.  You may obtain a copy of the NPL at
+ * http://www.mozilla.org/NPL/
+ * 
+ * Software distributed under the NPL is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
+ * for the specific language governing rights and limitations under the
+ * NPL.
+ * 
+ * The Initial Developer of this code under the NPL is Netscape
+ * Communications Corporation.  Portions created by Netscape are
+ * Copyright (C) 2000 Netscape Communications Corporation.  All Rights
+ * Reserved.
+ */
+
+/*
+ * File:        primblok.c
+ * Purpose:     testing whether the primordial thread can block in a
+ *              native blocking function without affecting the correct
+ *              functioning of NSPR I/O functions (Bugzilla bug #30746)
+ */
+
+#if !defined(WINNT)
+
+#include <stdio.h>
+
+int main()
+{
+    printf("This test is not relevant on this platform\n");
+    return 0;
+}
+
+#else /* WINNT */
+
+#include "nspr.h"
+
+#include <windows.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define TEST_FILE_NAME "primblok.dat"
+
+/* use InterlockedExchange to update this variable */
+static LONG iothread_done;
+
+static void PR_CALLBACK IOThread(void *arg)
+{
+    PRFileDesc *fd;
+    char buf[32];
+    PRInt32 nbytes;
+
+    /* Give the primordial thread one second to block */
+    Sleep(1000);
+
+    /*
+     * See if our PR_Write call will hang when the primordial
+     * thread is blocking in a native blocking function.
+     */
+    fd = PR_Open(TEST_FILE_NAME, PR_WRONLY|PR_CREATE_FILE, 0666);
+    if (NULL == fd) {
+        fprintf(stderr, "PR_Open failed\n");
+        exit(1);
+    }
+    memset(buf, 0xaf, sizeof(buf));
+    fprintf(stderr, "iothread: calling PR_Write\n");
+    nbytes = PR_Write(fd, buf, sizeof(buf));
+    fprintf(stderr, "iothread: PR_Write returned\n");
+    if (nbytes != sizeof(buf)) {
+        fprintf(stderr, "PR_Write returned %d\n", nbytes);
+        exit(1);
+    }
+    if (PR_Close(fd) == PR_FAILURE) {
+        fprintf(stderr, "PR_Close failed\n");
+        exit(1);
+    }
+    if (PR_Delete(TEST_FILE_NAME) == PR_FAILURE) {
+        fprintf(stderr, "PR_Delete failed\n");
+        exit(1);
+    }
+
+    /* Tell the main thread that we are done */
+    InterlockedExchange(&iothread_done, 1);
+}
+
+int main()
+{
+    PRThread *iothread;
+
+    /* Must be a global thread */
+    iothread = PR_CreateThread(
+        PR_USER_THREAD, IOThread, NULL, PR_PRIORITY_NORMAL,
+        PR_GLOBAL_THREAD, PR_JOINABLE_THREAD, 0);
+    if (iothread == NULL) {
+        fprintf(stderr, "cannot create thread\n");
+        exit(1);
+    }
+
+    /*
+     * Block in a native blocking function.
+     * Give iothread 5 seconds to finish its task.
+     */
+    Sleep(5000);
+
+    /*
+     * Is iothread done or is it hung?
+     *
+     * I'm actually only interested in reading the value
+     * of iothread_done.  I'm using InterlockedExchange as
+     * a thread-safe way to read iothread_done.
+     */
+    if (InterlockedExchange(&iothread_done, 1) == 0) {
+        fprintf(stderr, "iothread is hung\n");
+        fprintf(stderr, "FAILED\n");
+        exit(1);
+    }
+
+    if (PR_JoinThread(iothread) == PR_FAILURE) {
+        fprintf(stderr, "PR_JoinThread failed\n");
+        exit(1);
+    }
+    printf("PASSED\n");
+    return 0;
+}  /* main */
+
+#endif /* WINNT */

nsprpub/pr/tests/runtests.ksh

@@ -140,6 +140,7 @@ poll_nm
 poll_to
 pollable
 prftest
+primblok
 priotest
 provider
 ranfile