zircon/third_party/ulib/musl/pthread/pthread_mutexattr_settype.c

#include "threads_impl.h"

int pthread_mutexattr_settype(pthread_mutexattr_t* a, int type) {
  // RECURSIVE and ERRORCHECK are mutually exclusive.  Only allow one of the
  // two (or neither).
  switch (type) {
    case PTHREAD_MUTEX_NORMAL:
    case PTHREAD_MUTEX_RECURSIVE:
    case PTHREAD_MUTEX_ERRORCHECK:
      break;
    default:
      return EINVAL;
  }

  a->__attr = (a->__attr & ~(PTHREAD_MUTEX_TYPE_MASK << PTHREAD_MUTEX_TYPE_SHIFT)) |
              (type << PTHREAD_MUTEX_TYPE_SHIFT);

  return 0;
}