// this source is in the public domain
#import "semaphore_scope.h"

dispatch_semaphore_t foo_dsem_;  // initialized elsewhere

int foo() {
  DSemaphoreScope semscope(foo_dsem_);
  // critical section
  if (!something) {
    return 0;
    // dispatch_semaphore_signal implicitly called before returning
  }
  // do something else here maybe
  return 1;
  // dispatch_semaphore_signal implicitly called before returning
}