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1// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s2// UNSUPPORTED: tvos, watchos3// XFAIL: ios && !iossim4#include "sanitizer_common/sanitizer_ucontext.h"5#include "test.h"6 7char stack[64 * 1024] __attribute__((aligned(16)));8 9ucontext_t uc, orig_uc[2];10void *fiber, *orig_fiber[2];11 12const unsigned N = 1000;13 14__attribute__((noinline))15void switch0() {16  __tsan_switch_to_fiber(orig_fiber[0], 0);17  swapcontext(&uc, &orig_uc[0]);18}19 20void func() {21  for (;;) {22    switch0();23    __tsan_switch_to_fiber(orig_fiber[1], 0);24    swapcontext(&uc, &orig_uc[1]);25  }26}27 28void *Thread(void *x) {29  orig_fiber[1] = __tsan_get_current_fiber();30  for (unsigned i = 0; i < N; i++) {31    barrier_wait(&barrier);32    __tsan_switch_to_fiber(fiber, 0);33    swapcontext(&orig_uc[1], &uc);34    barrier_wait(&barrier);35  }36  return 0;37}38 39int main() {40  fiber = __tsan_create_fiber(0);41  barrier_init(&barrier, 2);42  pthread_t t;43  pthread_create(&t, 0, Thread, 0);44  orig_fiber[0] = __tsan_get_current_fiber();45  getcontext(&uc);46  uc.uc_stack.ss_sp = stack;47  uc.uc_stack.ss_size = sizeof(stack);48  uc.uc_link = 0;49  makecontext(&uc, func, 0);50  for (unsigned i = 0; i < N; i++) {51    __tsan_switch_to_fiber(fiber, 0);52    swapcontext(&orig_uc[0], &uc);53    barrier_wait(&barrier);54    barrier_wait(&barrier);55  }56  pthread_join(t, 0);57  __tsan_destroy_fiber(fiber);58  fprintf(stderr, "PASS\n");59  return 0;60}61 62// CHECK-NOT: WARNING: ThreadSanitizer:63// CHECK: PASS64