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// RUN: %clangxx_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s
#include <assert.h>
#include <stdlib.h>
#include <signal.h>
#include <unistd.h>
#include <stdio.h>
static bool signal_handler_ran = false;
void do_nothing_signal_handler(int signum) {
write(1, "HANDLER\n", 8);
signal_handler_ran = true;
}
int main() {
const int kSignalToTest = SIGSYS;
assert(SIG_ERR != signal(kSignalToTest, do_nothing_signal_handler));
sigset_t empty_set;
assert(0 == sigemptyset(&empty_set));
sigset_t one_signal = empty_set;
assert(0 == sigaddset(&one_signal, kSignalToTest));
sigset_t old_set;
assert(0 == sigprocmask(SIG_BLOCK, &one_signal, &old_set));
raise(kSignalToTest);
assert(!signal_handler_ran);
sigset_t all_but_one;
assert(0 == sigfillset(&all_but_one));
assert(0 == sigdelset(&all_but_one, kSignalToTest));
sigsuspend(&all_but_one);
assert(signal_handler_ran);
// Restore the original set.
assert(0 == sigprocmask(SIG_SETMASK, &old_set, NULL));
printf("DONE");
}
// CHECK: HANDLER
// CHECK: DONE
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