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// Copyright 2019 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 <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <unistd.h>
#include <errno.h>
#include <emscripten/em_asm.h>
#include <emscripten/console.h>
pthread_t threads[5];
static void *thread_start(void *arg)
{
// This should be long enough for threads to pile up.
long idx = (long)arg;
printf("Starting thread %ld\n", idx);
while (1) {
sleep(1);
}
printf("Finishing thread %ld\n", idx);
pthread_exit((void*)0);
}
void CreateThread(intptr_t idx) {
emscripten_outf("Main: Spawning thread %ld...", idx);
int rc = pthread_create(&threads[idx], NULL, thread_start, (void*)idx);
assert(rc == 0);
}
int main()
{
// This test should be run with a prewarmed pool of size 4. None
// of the threads are allocated yet.
assert(EM_ASM_INT(return PThread.unusedWorkers.length) == 4);
assert(EM_ASM_INT(return PThread.runningWorkers.length) == 0);
CreateThread(0);
// We have one running thread, allocated on demand.
assert(EM_ASM_INT(return PThread.unusedWorkers.length) == 3);
assert(EM_ASM_INT(return PThread.runningWorkers.length) == 1);
for (int i = 1; i < 5; ++i) {
CreateThread(i);
}
// All the preallocated workers should be used.
// We can't join the threads or we'll hang forever. The main thread
// won't give up the thread to let the 5th thread be created. This is
// solved in non-test cases by using PROXY_TO_PTHREAD, but we can't
// do that here since we need to eval the length of the various pthread
// arrays.
assert(EM_ASM_INT(return PThread.runningWorkers.length) == 5);
assert(EM_ASM_INT(return PThread.unusedWorkers.length) == 0);
return 0;
}
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