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// Copyright 2015 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#include <pthread.h>
#include <stdio.h>
#include <errno.h>
#include <emscripten.h>
#include <emscripten/threading.h>
// Toggle to use two different methods for updating shared data (C++03 volatile vs explicit atomic ops).
// Note that using a volatile variable explicitly depends on x86 strong memory model semantics.
//#define USE_C_VOLATILE
volatile int sharedVar = 0;
static void *thread_start(void *arg) // thread: just flip the shared flag and quit.
{
#ifdef USE_C_VOLATILE
sharedVar = 1;
#else
emscripten_atomic_store_u32((void*)&sharedVar, 1);
#endif
pthread_exit(0);
}
int main()
{
int result;
if (!emscripten_has_threading_support())
{
#ifdef REPORT_RESULT
REPORT_RESULT(1);
#endif
printf("Skipped: Threading is not supported.\n");
return 0;
}
pthread_t thr;
int rc = pthread_create(&thr, NULL, thread_start, (void*)0);
if (rc != 0)
{
#ifdef REPORT_RESULT
int result = (rc != EAGAIN);
REPORT_RESULT(result);
return 0;
#endif
}
#ifdef USE_C_VOLATILE
while(sharedVar == 0)
;
#else
while(emscripten_atomic_load_u32((void*)&sharedVar) == 0) {}
#endif
#ifdef REPORT_RESULT
REPORT_RESULT(sharedVar);
#endif
}
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