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/**
* Copyright (c) NVIDIA CORPORATION & AFFILIATES, 2023. ALL RIGHTS RESERVED.
*
* See file LICENSE for terms.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/mman.h>
#include <sys/time.h>
#include <dlfcn.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <pthread.h>
#include <ucs/sys/preprocessor.h>
#include <ucm/api/ucm.h>
#include <ucm/util/sys.h>
#define DEFAULT_THREAD_COUNT 16
#define DEFAULT_THREAD_TIMEOUT 1
typedef struct {
const char *libname;
int thread_count;
pthread_t *threads;
volatile int stop;
double thread_timeout;
void *dl_handle;
} context_t;
static ucs_status_t ctx_init(context_t *ctx, const char *filename,
int thread_count, int thread_timeout)
{
pthread_t *threads;
threads = calloc(thread_count, sizeof(*threads));
if (threads == NULL) {
return UCS_ERR_NO_MEMORY;
}
ctx->dl_handle = NULL;
ctx->libname = filename;
ctx->thread_count = thread_count;
ctx->threads = threads;
ctx->stop = 0;
ctx->thread_timeout = thread_timeout;
return UCS_OK;
}
static ucs_status_t ctx_load_library(context_t *ctx)
{
printf("loading library to trigger hooks installation\n");
dlerror();
ctx->dl_handle = dlopen(ctx->libname, RTLD_NOW);
if (ctx->dl_handle == NULL) {
printf("dlopen(filename=\"%s\", RTLD_NOW) failed: %s\n", ctx->libname,
dlerror());
return UCS_ERR_INVALID_PARAM;
}
return UCS_OK;
}
static void *thread_handler(void *arg)
{
context_t *ctx = arg;
double deadline = ucm_get_time() + ctx->thread_timeout;
/*
* Many threads racing for read lock are preventing ucm to finish testing
* the installed hooks, so we make sure to stop the threads after
* reasonable time.
*/
do {
if (mmap(NULL, 0, PROT_READ | PROT_WRITE, MAP_PRIVATE, -1, 0) !=
MAP_FAILED) {
printf("failed to return mmap_call() failure\n");
exit(EXIT_FAILURE);
}
} while (!ctx->stop &&
((ctx->thread_timeout == 0) || (ucm_get_time() < deadline)));
return NULL;
}
static void ctx_stop_threads(context_t *ctx, int count)
{
int i;
printf("stopping %d threads\n", count);
ctx->stop = 1;
for (i = 0; i < count; i++) {
pthread_join(ctx->threads[i], NULL);
}
}
static ucs_status_t ctx_start_threads(context_t *ctx)
{
int i, ret;
for (i = 0; i < ctx->thread_count; i++) {
ret = pthread_create(&ctx->threads[i], NULL, thread_handler, ctx);
if (ret < 0) {
printf("pthread_create(thread #%d) failed: %m\n", i);
goto err;
}
}
printf("started %d threads\n", ctx->thread_count);
return UCS_OK;
err:
ctx_stop_threads(ctx, i);
return UCS_ERR_NO_RESOURCE;
}
static void ctx_free(context_t *ctx)
{
if (ctx->dl_handle != NULL) {
dlclose(ctx->dl_handle);
}
free(ctx->threads);
}
static void usage(const char *argv0)
{
printf("Usage: %s [options]\n", argv0);
printf("Options:\n");
printf(" -n : Number of threads racing with function patching (default: "
"%d)\n",
DEFAULT_THREAD_COUNT);
printf(" -d : Disable thread timeout (default %d sec)\n",
DEFAULT_THREAD_TIMEOUT);
printf(" -h : Display help message\n");
printf("\n");
}
int main(int argc, char **argv)
{
int thread_count = DEFAULT_THREAD_COUNT;
int thread_timeout = DEFAULT_THREAD_TIMEOUT;
int delay_usec = 200 * 1000;
int c, ret;
context_t ctx;
ucs_status_t status;
while ((c = getopt(argc, argv, "n:dh")) != -1) {
switch (c) {
case 'n':
thread_count = atoi(optarg);
break;
case 'd':
thread_timeout = 0;
break;
case 'h':
default:
usage(argv[0]);
return -1;
}
}
status = ctx_init(&ctx, UCS_PP_MAKE_STRING(LIB_PATH), thread_count,
thread_timeout);
if (status != UCS_OK) {
return -1;
}
printf("thread timeout: %d sec\n", thread_timeout);
status = ctx_start_threads(&ctx);
if (status != UCS_OK) {
printf("failed to start threads\n");
ret = -1;
goto out;
}
usleep(delay_usec); /* make sure threads are running */
/* trigger ucm memory patching */
status = ctx_load_library(&ctx);
if (status != UCS_OK) {
printf("failed to load library\n");
ret = -1;
goto out_stop_threads;
}
usleep(delay_usec); /* make sure threads have time to race */
ret = 0;
out_stop_threads:
ctx_stop_threads(&ctx, ctx.thread_count);
out:
ctx_free(&ctx);
return ret;
}
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