File: many_threads_detach.cpp

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llvm-toolchain-20 1%3A20.1.8-1~exp1
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// Test that threads are reused.
// On Android, pthread_* are in libc.so. So the `-lpthread` is not supported.
// Use `-pthread` so that its driver will DTRT (ie., ignore it).
// RUN: %clangxx_lsan %s -o %t -pthread && %run %t

#include <assert.h>
#include <dirent.h>
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>

// Number of threads to create. This value is greater than kMaxThreads in
// lsan_thread.cpp so that we can test that thread contexts are not being
// reused.
static const size_t kTestThreads = 10000;

// Limit the number of simultaneous threads to avoid reaching the limit.
static const size_t kTestThreadsBatch = 100;

void *null_func(void *args) {
  return NULL;
}

int main(void) {
  for (size_t i = 0; i < kTestThreads; i += kTestThreadsBatch) {
    pthread_t thread[kTestThreadsBatch];
    for (size_t j = 0; j < kTestThreadsBatch; ++j)
      assert(pthread_create(&thread[j], NULL, null_func, NULL) == 0);

    for (size_t j = 0; j < kTestThreadsBatch; ++j)
      assert(pthread_join(thread[j], NULL) == 0);
  }
  return 0;
}