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hdb: Fix concurrency test

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This commit is contained in:
Nicolas Williams
2020-10-08 20:34:38 -05:00
parent 18e8ccf4c2
commit 5d156a5799
1 changed files with 123 additions and 75 deletions
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194
lib/hdb/test_concurrency.c
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@@ -52,10 +52,6 @@
#include <pthread.h>
#include <getarg.h>
static int use_threads;
static int help_flag;
static int version_flag;
struct tsync {
pthread_mutex_t lock;
pthread_cond_t rcv;
@@ -82,6 +78,15 @@ threaded_reader(void *d)
if ((krb5_init_context(&context)))
errx(1, "krb5_init_context failed");
printf("Reader thread waiting for writer to create the HDB\n");
(void) pthread_mutex_lock(&s->lock);
s->writer_go = 1;
(void) pthread_cond_signal(&s->wcv);
while (!s->reader_go)
(void) pthread_cond_wait(&s->rcv, &s->lock);
s->reader_go = 0;
(void) pthread_mutex_unlock(&s->lock);
/* Open a new HDB handle to read */
if ((ret = hdb_create(context, &dbr, s->hdb_name))) {
//(void) unlink(s->fname);
@@ -108,6 +113,8 @@ threaded_reader(void *d)
printf("Reader thread waiting for writer\n");
while (!s->reader_go)
(void) pthread_cond_wait(&s->rcv, &s->lock);
s->reader_go = 0;
(void) pthread_mutex_unlock(&s->lock);
/* Iterate the rest */
printf("Reader thread iterating another entry\n");
@@ -161,6 +168,11 @@ forked_reader(struct tsync *s)
if ((krb5_init_context(&context)))
errx(1, "krb5_init_context failed");
printf("Reader process waiting for writer\n");
while ((bytes = read(s->reader_go_pipe[0], b, sizeof(b))) == -1 &&
errno == EINTR)
;
/* Open a new HDB handle to read */
if ((ret = hdb_create(context, &dbr, s->hdb_name))) {
//(void) unlink(s->fname);
@@ -175,6 +187,7 @@ forked_reader(struct tsync *s)
//(void) unlink(s->fname);
krb5_err(context, 1, ret, "Could not iterate HDB %s", s->hdb_name);
}
printf("Reader process iterated one entry\n");
free_hdb_entry(&entr.entry);
/* Tell the writer to go ahead and write */
@@ -195,7 +208,6 @@ forked_reader(struct tsync *s)
errx(1, "Could not read from reader-go pipe (EOF)");
/* Iterate the rest */
printf("Reader process iterating another entry\n");
if ((ret = dbr->hdb_nextkey(context, dbr, 0, &entr))) {
//(void) unlink(s->fname);
krb5_err(context, 1, ret,
@@ -257,7 +269,50 @@ make_entry(krb5_context context, hdb_entry_ex *entry, const char *name)
}
static void
test_hdb_concurrency(char *name, const char *ext)
readers_turn(struct tsync *s, pid_t child, int threaded)
{
if (threaded) {
(void) pthread_mutex_lock(&s->lock);
s->reader_go = 1;
(void) pthread_cond_signal(&s->rcv);
while (!s->writer_go)
(void) pthread_cond_wait(&s->wcv, &s->lock);
s->writer_go = 0;
(void) pthread_mutex_unlock(&s->lock);
} else {
ssize_t bytes;
char b[1];
while ((bytes = write(s->reader_go_pipe[1], "", sizeof(""))) == -1 &&
errno == EINTR)
;
if (bytes == -1) {
kill(child, SIGKILL);
err(1, "Could not write to reader-go pipe (error)");
}
if (bytes == 0) {
kill(child, SIGKILL);
err(1, "Could not write to reader-go pipe (EOF?)");
}
while ((bytes = read(s->writer_go_pipe[0], b, sizeof(b))) == -1 &&
errno == EINTR)
;
if (bytes == -1) {
kill(child, SIGKILL);
err(1, "Could not read from writer-go pipe");
}
if (bytes == 0) {
kill(child, SIGKILL);
errx(1, "Child errored");
}
s->writer_go = 0;
}
}
static void
test_hdb_concurrency(char *name, const char *ext, int threaded)
{
krb5_error_code ret;
krb5_context context;
@@ -290,6 +345,32 @@ test_hdb_concurrency(char *name, const char *ext)
ts.hdb_name = name;
ts.fname = fname_ext;
if (threaded) {
printf("Starting reader thread\n");
(void) pthread_mutex_lock(&ts.lock);
if ((errno = pthread_create(&reader_thread, NULL, threaded_reader, &ts))) {
(void) unlink(fname_ext);
krb5_err(context, 1, errno, "Could not create a thread to read HDB");
}
/* Wait for reader */
while (!ts.writer_go)
(void) pthread_cond_wait(&ts.wcv, &ts.lock);
(void) pthread_mutex_unlock(&ts.lock);
} else {
printf("Starting reader process\n");
if (pipe(ts.writer_go_pipe) == -1)
err(1, "Could not create a pipe");
if (pipe(ts.reader_go_pipe) == -1)
err(1, "Could not create a pipe");
switch ((child = fork())) {
case -1: err(1, "Could not fork a child");
case 0: forked_reader(&ts); _exit(0);
default: break;
}
(void) close(ts.writer_go_pipe[1]);
ts.writer_go_pipe[1] = -1;
}
printf("Writing two entries into HDB\n");
if ((ret = hdb_create(context, &dbw, name)))
@@ -315,32 +396,8 @@ test_hdb_concurrency(char *name, const char *ext)
}
free_hdb_entry(&entw.entry);
if (use_threads) {
printf("Starting reader thread\n");
(void) pthread_mutex_lock(&ts.lock);
if ((errno = pthread_create(&reader_thread, NULL, threaded_reader, &ts))) {
(void) unlink(fname_ext);
krb5_err(context, 1, ret, "Could not create a thread to read HDB");
}
/* Wait for reader */
while (!ts.writer_go)
(void) pthread_cond_wait(&ts.wcv, &ts.lock);
(void) pthread_mutex_unlock(&ts.lock);
} else {
printf("Starting reader process\n");
if (pipe(ts.writer_go_pipe) == -1)
err(1, "Could not create a pipe");
if (pipe(ts.reader_go_pipe) == -1)
err(1, "Could not create a pipe");
switch ((child = fork())) {
case -1: err(1, "Could not fork a child");
case 0: forked_reader(&ts); _exit(0);
default: break;
}
(void) close(ts.writer_go_pipe[1]);
ts.writer_go_pipe[1] = -1;
}
/* Tell the reader to start reading */
readers_turn(&ts, child, threaded);
/* Store one more entry */
if ((ret = make_entry(context, &entw, "foobar")) ||
@@ -352,46 +409,12 @@ test_hdb_concurrency(char *name, const char *ext)
}
free_hdb_entry(&entw.entry);
if (use_threads) {
(void) pthread_mutex_lock(&ts.lock);
ts.reader_go = 1;
(void) pthread_cond_signal(&ts.rcv);
while (!ts.writer_go)
(void) pthread_cond_wait(&ts.wcv, &ts.lock);
} else {
ssize_t bytes;
char b[1];
while ((bytes = write(ts.reader_go_pipe[1], "", sizeof(""))) == -1 &&
errno == EINTR)
;
if (bytes == -1) {
kill(child, SIGKILL);
err(1, "Could not write to reader-go pipe (error)");
}
if (bytes == 0) {
kill(child, SIGKILL);
err(1, "Could not write to reader-go pipe (EOF?)");
}
while ((bytes = read(ts.writer_go_pipe[0], b, sizeof(b))) == -1 &&
errno == EINTR)
;
if (bytes == -1) {
kill(child, SIGKILL);
err(1, "Could not read from writer-go pipe");
}
if (bytes == 0) {
kill(child, SIGKILL);
errx(1, "Child errored");
}
}
/* Tell the reader to go again */
readers_turn(&ts, child, threaded);
dbw->hdb_close(context, dbw);
dbw->hdb_destroy(context, dbw);
if (use_threads) {
if (threaded) {
(void) pthread_join(reader_thread, NULL);
} else {
(void) close(ts.writer_go_pipe[1]);
@@ -409,7 +432,13 @@ test_hdb_concurrency(char *name, const char *ext)
krb5_free_context(context);
}
static int use_fork;
static int use_threads;
static int help_flag;
static int version_flag;
struct getargs args[] = {
{ "use-fork", 'f', arg_flag, &use_fork, NULL, NULL },
{ "use-threads", 't', arg_flag, &use_threads, NULL, NULL },
{ "help", 'h', arg_flag, &help_flag, NULL, NULL },
{ "version", 0, arg_flag, &version_flag, NULL, NULL }
@@ -439,14 +468,33 @@ main(int argc, char **argv)
return 0;
}
printf("Testing SQLite3 HDB backend\n");
if (!use_fork && !use_threads)
use_threads = use_fork = 1;
#ifdef HAVE_FORK
if (use_fork) {
printf("Testing SQLite3 HDB backend (multi-process)\n");
memcpy(stemplate, "sqlite:testhdb-XXXXXX", sizeof("sqlite:testhdb-XXXXXX"));
test_hdb_concurrency(stemplate, "");
test_hdb_concurrency(stemplate, "", 0);
#ifdef HAVE_LMDB
printf("Testing LMDB HDB backend\n");
printf("Testing LMDB HDB backend (multi-process)\n");
memcpy(ltemplate, "lmdb:testhdb-XXXXXX", sizeof("lmdb:testhdb-XXXXXX"));
test_hdb_concurrency(ltemplate, ".lmdb");
test_hdb_concurrency(ltemplate, ".lmdb", 0);
#endif
}
#endif
if (use_threads) {
printf("Testing SQLite3 HDB backend (multi-process)\n");
memcpy(stemplate, "sqlite:testhdb-XXXXXX", sizeof("sqlite:testhdb-XXXXXX"));
test_hdb_concurrency(stemplate, "", 1);
#ifdef HAVE_LMDB
printf("Testing LMDB HDB backend (multi-process)\n");
memcpy(ltemplate, "lmdb:testhdb-XXXXXX", sizeof("lmdb:testhdb-XXXXXX"));
test_hdb_concurrency(ltemplate, ".lmdb", 1);
#endif
}
return 0;
}