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// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
// UNSUPPORTED: darwin
#include "test.h"
#include <ucontext.h>
char stack[64 * 1024] __attribute__((aligned(16)));
ucontext_t uc, orig_uc[2];
void *fiber, *orig_fiber[2];
const unsigned N = 1000;
__attribute__((noinline))
void switch0() {
__tsan_switch_to_fiber(orig_fiber[0], 0);
swapcontext(&uc, &orig_uc[0]);
}
void func() {
for (;;) {
switch0();
__tsan_switch_to_fiber(orig_fiber[1], 0);
swapcontext(&uc, &orig_uc[1]);
}
}
void *Thread(void *x) {
orig_fiber[1] = __tsan_get_current_fiber();
for (unsigned i = 0; i < N; i++) {
barrier_wait(&barrier);
__tsan_switch_to_fiber(fiber, 0);
swapcontext(&orig_uc[1], &uc);
barrier_wait(&barrier);
}
return 0;
}
int main() {
fiber = __tsan_create_fiber(0);
barrier_init(&barrier, 2);
pthread_t t;
pthread_create(&t, 0, Thread, 0);
orig_fiber[0] = __tsan_get_current_fiber();
getcontext(&uc);
uc.uc_stack.ss_sp = stack;
uc.uc_stack.ss_size = sizeof(stack);
uc.uc_link = 0;
makecontext(&uc, func, 0);
for (unsigned i = 0; i < N; i++) {
__tsan_switch_to_fiber(fiber, 0);
swapcontext(&orig_uc[0], &uc);
barrier_wait(&barrier);
barrier_wait(&barrier);
}
pthread_join(t, 0);
__tsan_destroy_fiber(fiber);
fprintf(stderr, "PASS\n");
return 0;
}
// CHECK-NOT: WARNING: ThreadSanitizer:
// CHECK: PASS
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